Available materials(Product Standards: Q/BQB 620-2013)

Grade	Thickness(mm)
B610CFHQL2	10-150
B780CFHQL2	10-150
B610CFHML2	10-60
B780CFHML2	10-60
Mainly processed as pressure steel tube,volute, bifurcated pipe which can be served at -20℃.
B610CFHQL4	10-150
B780CFHQL4	10-150
B610CFHQL4	10-60
B780CFHQL4	10-60
Mainly processed as pressure steel tube, volute, bifurcated pipe which can be served at -40℃.
B780CFHQL5	10-150
B780CFHML5	10-60
Mainly processed as pressure steel tube, volute, bifurcated pipe which can be served at -50℃.

Chemical composition

Grade	Thickness(mm)	Chemical composition%
		C	Si	Mn	P	S	Cu
B610CFHQL2	10-80	≤0.09	≤0.40	0.60-1.60	≤0.015	≤0.007	≤0.25
B610CFHML2	10-80	≤0.09	≤0.40	0.60-1.60	≤0.015	≤0.007	≤0.25
B610CFHQL4	10-80	≤0.09	≤0.40	0.60-1.60	≤0.015	≤0.007	≤0.25
B610CFHML4	10-80	≤0.09	≤0.40	0.60-1.60	≤0.015	≤0.007	≤0.25
B780CFHQL2	10-80	≤0.09	≤0.40	0.60-1.60	≤0.015	≤0.007	≤0.40
B780CFHML2	10-80	≤0.09	≤0.40	0.60-1.60	≤0.015	≤0.007	≤0.40
B780CFHQL4	10-80	≤0.09	≤0.40	0.60-1.60	≤0.015	≤0.007	≤0.40
B780CFHML4	10-80	≤0.09	≤0.40	0.60-1.60	≤0.015	≤0.007	≤0.40
B780CFHQL5	10-80	≤0.09	≤0.40	0.60-1.60	≤0.015	≤0.007	≤0.40
B780CFHML5	10-80	≤0.09	≤0.40	0.60-1.60	≤0.015	≤0.007	≤0.40

Mechanical properties

Grade	Thickness(mm)	Mechanical properties
		YS(MPa)	TS(MPa)	EL%
B610CFHQL2	10-75	≥490	610-740	≥17
	＞75-150	≥470	590-720
B610CFHML2	10-75	≥490	610-740	≥17
	＞75-150	≥470	590-720
B610CFHQL4	10-75	≥490	610-740	≥17
	＞75-150	≥470	590-720
B610CFHML4	10-75	≥490	610-740	≥17
	＞75-150	≥470	590-720
B780CFHQL2	10-50	≥690	780-920	≥15
	＞50-150	≥670	760-900
B780CFHML2	10-50	≥690	780-920	≥15
	＞50-150	≥670	760-900
B780CFHQL4	10-50	≥690	780-920	≥15
	＞50-150	≥670	760-900
B780CFHML4	10-50	≥690	780-920	≥15
	＞50-150	≥670	760-900
B780CFHQL5	10-50	≥690	780-920	≥15
	＞50-150	≥670	760-900
B780CFHML5	10-50	≥690	780-920	≥15
	＞50-150	≥670	760-900

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Composition of prepainted steel

Prepainted steel is a type of coated steel product that is produced by applying a layer of paint or other protective coating to the surface of the steel substrate. The composition of prepainted steel can vary depending on the specific requirements of the product, but typically includes the following components:

Steel substrate: The base material of prepainted steel is typically a high-quality carbon steel or alloy steel sheet that has been cold-rolled or hot-rolled to the desired thickness.

Pre-treatment: The steel substrate is first subjected to a pre-treatment process to ensure that the surface is clean and free from any contaminants. This process typically involves a combination of cleaning, degreasing, and chemical treatment to remove any rust, oil, or other impurities from the surface.

Primer: A layer of primer is then applied to the surface of the steel substrate to improve the adhesion of the paint or coating. The primer typically contains a combination of pigments, resins, and other additives to provide good corrosion resistance and adhesion.

Topcoat: The final layer is the topcoat, which is typically made up of a combination of pigments, resins, and other additives to provide the desired color, gloss, and durability. The topcoat may also contain additional ingredients such as UV stabilizers or anti-graffiti agents to enhance the performance of the coating.

Overall, the composition of prepainted steel is designed to provide a high-quality, durable, and attractive finish that is resistant to corrosion, weathering, and other environmental factors.

Common production methods of prepainted steel

Prepainted steel, also known as pre-coated steel or color-coated steel, is a type of steel that has been coated with a layer of paint or other protective coating. There are several methods used to produce prepainted steel, including coil coating, continuous color coating, and electrostatic painting.

Coil coating: Coil coating is the most common method used to produce prepainted steel. In this process, a coil of steel is cleaned, treated with a chemical primer, and then coated with a layer of paint or other protective coating. The coil is then baked in an oven to cure the coating and create a durable finish.

Continuous color coating: Continuous color coating is similar to coil coating, but it is used for larger sheets of steel. In this process, the steel sheet is cleaned, primed, and coated with a layer of paint or other protective coating. The sheet is then cured in an oven and cut to size.

Electrostatic painting: Electrostatic painting is a process in which the steel is coated with a paint or powder using an electrostatic charge. The paint or powder is sprayed onto the steel, and the electrostatic charge attracts it to the surface of the metal. The steel is then baked in an oven to cure the coating.

What is the properties of prepainted steel?

Prepainted steel is a type of metal product that has a layer of paint or coating applied to its surface before it is sold. This coating is typically made from a combination of resins, pigments, and other additives that provide the steel with a range of beneficial properties. One of the main benefits of prepainted steel is its resistance to corrosion, which can help to prolong its lifespan and reduce the need for maintenance. Additionally, prepainted steel is available in a wide variety of colors and finishes, making it a popular choice for a range of applications in the construction, automotive, and appliance industries. Other properties of prepainted steel may include resistance to weathering, UV radiation, and abrasion, as well as the ability to withstand high temperatures and humidity levels.

What are the common applications of prepainted steel?

Here are some common applications of prepainted steel:

Building and construction: Prepainted steel is widely used in the construction industry for roofing, cladding, and facade systems. The material is popular due to its durability, ease of installation, and ability to create different colors and designs.

Automotive industry: Prepainted steel is also used in the automotive industry for various applications such as body panels, bumpers, and trim. The material is lightweight, corrosion-resistant, and provides an excellent finish.

Appliances: Prepainted steel is commonly used in the production of appliances such as refrigerators, washing machines, and dryers. The material is durable, easy to clean, and can be coated with different colors and patterns to match the appliance design.

Electrical industry: Prepainted steel is used in the production of electrical enclosures, control cabinets, and switchgear. The material is resistant to chemicals, weather, and UV radiation.

Furniture: Prepainted steel is used in the production of furniture such as desks, chairs, and cabinets. The material is strong, durable, and can be coated with different colors and designs to match the interior decor.

Packaging: Prepainted steel is used in the production of packaging materials such as cans, containers, and closures. The material is lightweight, corrosion-resistant, and provides a high-quality finish.

Overall, prepainted steel has a wide range of applications due to its durability, versatility, and aesthetic appeal.

Introduction

Composite steel plate is produced using composite rolling technology, which involves rolling together carbon structural steel, low-alloy high-strength structural steel, or high-strength quenched and tempered steel, with stainless steel, special steel, or other materials, to create a plate with single or double-sided bonding. The resulting composite steel plate has a high degree of bonding between its constituent layers.

Features

Clad plates are categorized into three types, namely mechanical clad, explosion clad, and Clad-Rolled plate. Mechanical clad is primarily utilized in the direct production of clad pipes, while explosion clad and rolled-clad methods involve the production of clad steel plates first, which are then transformed into clad pipes or hot and cold-rolled clad plates/coils.

Material grades/Mechanical properties

Grade	Mechanical properties
	YS(MPa)	TS(MPa)	EL%
SA533CL1+304L	555	661	25
S31254+Q345B	450	650	30
825+X65	500	594	46
304L+BDT01+304L	395	540	32
S32205+Q345C	545	638	22
316L+Q345B	430	580	30

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Product description

BMJ01 stainless steel composite coils are produced using a controlled rolling and cooling technique that combines conventional austenitic stainless steel 304 with ordinary carbon steel Q235B. This composite rolling process results in products with superior comprehensive properties, including excellent mechanical properties and corrosion resistance.

Characteristic

A robust economy requires the efficient use of precious metals like nickel and chromium. Atomic diffusion is used to bond the base and cladding materials, making it impossible to separate them. Composite materials offer comparable levels of uniform corrosion resistance and pitting as solid solution 304. In fact, they often outperform carbon steel alternatives. Welding filler metals produce joints that exhibit exceptional overall performance.

Material grade and performance introduction

Chemical Composition and Mechanical Properties

Grade	Chemical composition%
	C	N	Si	Mn	Cr	Ni
BMJ01	≤0.08	≤0.10	≤0.75	≤2.0	18.0-20.0	8.0-10.0

Grade	Mechanical properties
	YS(MPa)	TS(MPa)	EL%
BMJ01	300	450	44

Microstructure

The base material is carbon steel, which exhibits a typical structure of ferrite (F) and pearlite (P). On the other hand, the cladding material is stainless steel, devoid of carbide precipitation, and bonded metallurgically to the base material.

Corrosion performance

The composite material exhibits uniform corrosion resistance, as demonstrated by its ability to withstand the neutral salt spray test specified in GB/T10125 for 240 hours without any signs of rust. Its pitting corrosion performance is also noteworthy, with a pitting potential measurement of above 0.30V, which is equivalent to solid solution 304 stainless steel, as per the GB/T 17899 method. Furthermore, its intergranular corrosion resistance is comparable to that of solid solution 304 stainless steel, as determined by the ASTM G108 test method for detecting electrochemical reactivation (EPR) in sensitized 304 and 304L stainless steel.

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Product description

Checkered plates are in high demand due to their aesthetic appeal and slip-resistant surfaces, and are commonly used in a variety of settings such as roads, stairways, trench covers, and platforms in various industrial settings including manufacturing, chemical plants, food factories, and pharmaceutical plants. However, carbon steel checkered plates are known to be susceptible to corrosion, which poses a major problem for industries operating in corrosive environments. This not only increases costs but also compromises the safety of components, reducing the material's usability. To address this issue, designers may consider using additional materials and extending maintenance periods. While stainless steel checkered plates offer corrosion resistance, they lack the necessary structural properties for safe operation. Rolled composite high-strength anti-corrosion checkered plates have recently been introduced as a solution, offering both the corrosion resistance of stainless steel cladding and the mechanical properties of carbon steel bases. These plates exhibit superior macroscopic appearance characteristics, enhanced structural features, mechanical properties, and user processing abilities, making them a highly preferred option overall.

Structural features

The composite pattern plate comprises of four layers, with the upper and lower layers made of stainless steel, while the center layer is carbon steel. The upper surface features a patterned design, and the lower surface is flat. By using stainless steel cladding material in the upper and lower layers, the composite pattern plate offers equivalent corrosion resistance as pure stainless steel. It eliminates the need for anti-corrosion treatment during use, reduces the need for manual inspection and maintenance, and eliminates potential safety hazards.

Material grades and performance characteristics

Mechanical properties

Grade		Mechanical properties
		YS,,Mpa	TS,Mpa	EL,%
BHW01	Technical conditions	≥350	≥500	≥10
	Typical performance	484	627	37.3
BHW02	Technical conditions	≥350	≥500	≥10
	Typical performance	487	597	22.4

Machinability

The exceptional processing capabilities of the material allow for both forward and reverse bending up to 0.7a without cracking or delamination, meeting the processing requirements of numerous components.

Corrosion resistance

The material exhibits excellent corrosion resistance, with uniform performance in neutral salt spray tests (GB/T 10125) for up to 240 hours without any signs of rusting. In terms of pitting performance, the multilayer stainless steel's pitting potential measures above 0.30V using the GB/T 17899 method, equivalent to that of solid solution 304 stainless steel. Similarly, when tested for intergranular corrosion resistance using the ASTM G108 electrochemical reactivation (EPR) test method, the multilayer stainless steel performs similarly to solid solution 304 stainless steel.

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What is electro-galvanizing?

Electro-galvanizing, also known as electroplating or electrodeposition, is a process of coating a metal with a layer of zinc using an electrical current. The process involves immersing the metal object, typically steel, into an electrolyte solution containing dissolved zinc ions, and then applying an electric current to the metal.

The electric current causes the zinc ions in the solution to be attracted to the metal surface, where they form a thin layer of zinc on the metal. The thickness of the zinc coating can be controlled by adjusting the voltage and the duration of the electro-galvanizing process.

The electro-galvanizing process provides several benefits, including corrosion resistance, improved appearance, and enhanced durability. Zinc is an excellent sacrificial anode, meaning it corrodes in preference to the underlying metal, providing a protective barrier against corrosion. Additionally, the zinc layer can be finished to achieve a range of surface textures, from smooth to matte or textured. Electro-galvanizing is commonly used in the manufacturing of automotive parts, appliances, construction materials, and various other products.

The main purpose

Automobile: body panels, radios, fans, air cleaners, filters, fuel tanks

Home appliances: refrigerators, washing machines, dryers, air conditioners, VCRs, CD players, color TVs, tape recorders, microwave ovens, audio, flat-screen TVs, liquid TVs, plasma TVs, set-top boxes

Office machines: copiers, computer cases, printers, monitors, telex machines

Construction: doors, wall partitions, joists

Production machinery: agricultural machinery, industrial robots

Others: Distributors, oil storage tanks, motor covers, steel furniture bases

Material Grade/Composition and Properties

Main use: for stamping

Grade	Chemical composition%
	C	Mn	P	S	Alt
SPCC	≤0.12	≤0.50	≤0.035	≤0.025	⩾0.020
SPCD	≤0.10	≤0.45	≤0.030	≤0.025	⩾0.020
SPCE, SPCEN	≤0.08	≤0.40	≤0.025	≤0.020	⩾0.020

Grade	Mechanical properties
	YS(MPa)	TS(MPa)	EL%
SPCC	-	⩾270	⩾30
SPCD	-	⩾270	⩾32
SPCE, SPCEN	⩾210	⩾270	⩾34

Grade	Chemical composition%
	C	Mn	P	S	Alt	Ti%
BLCE+Z,BLCE+ZN	≤0.10	≤0.50	≤0.035	≤0.025	⩾0.020	-
BLDE+Z,BLDE+ZN	≤0.08	≤0.45	≤0.030	≤0.025	⩾0.020	-
BUSDE+Z,BUSDE+ZN	≤0.010	≤0.40	≤0.025	≤0.020	≥0.015	≤0.20
BUFDE+Z,BUFDE+ZN	≤0.008	≤0.30	≤0.020	≤0.020	≥0.015	≤0.20
BSUFDE+Z,BSUFDE+ZN	≤0.006	≤0.30	≤0.020	≤0.020	≥0.015	≤0.20

Grade	Mechanical properties
	YS(MPa)	TS(MPa)	EL%
BLCE+Z,BLCE+ZN	140~270	⩾270	⩾36
BLDE+Z,BLDE+ZN	120~240	⩾270	⩾38
BUSDE+Z,BUSDE+ZN	120~210	⩾260	⩾40
BUFDE+Z,BUFDE+ZN	120~190	⩾250	⩾42
BSUFDE+Z,BSUFDE+ZN	110~180	⩾250	⩾44

Main use: for cold forming

Grade	Chemical composition%
	C	Mn	P	S	Alt	Ti%
B170P1E+Z,B170P1E+ZN	≤0.006	≤1.00	≤0.08	≤0.025	⩾0.015	≤0.20
B210P1E+Z,B210P1E+ZN	≤0.008	≤1.20	≤0.10	≤0.025	⩾0.015	≤0.20
B250P1E+Z,B250P1E+ZN	≤0.008	≤1.20	≤0.12	≤0.025	≥0.015	≤0.20
B180P2E+Z,B180P2E+ZN	≤0.08	≤0.80	≤0.12	≤0.025	⩾0.020	-
B220P2E+Z,B220P2E+ZN	≤0.10	≤1.00	≤0.12	≤0.025	⩾0.020	-

Grade	Mechanical properties
	YS(MPa)	TS(MPa)	EL%
B170P1E+Z,B170P1E+ZN	170~260	⩾340	⩾36
B210P1E+Z,B210P1E+ZN	210~310	⩾390	⩾32
B250P1E+Z,B250P1E+ZN	250~360	⩾440	⩾30

Grade	Chemical composition%
	C	Mn	P	S	Alt	Nb
B140H1E+Z,B140H1E+ZN	≤0.006	≤0.40	≤0.04	≤0.020	⩾0.015	≤0.10
B180H1E+Z,B180H1E+ZN	≤0.008	≤1.00	≤0.08	≤0.020	⩾0.015	≤0.10
B180H2E+Z,B180H2E+ZN	≤0.020	≤0.40	≤0.12	≤0.025	⩾0.020	-

Grade	Mechanical properties
	YS(MPa)	TS(MPa)	EL%
B140H1E+Z,B140H1E+ZN	140~230	⩾270	⩾41
B180H1E+Z,B180H1E+ZN	180~280	⩾340	⩾35
B180H2E+Z,B180H2E+ZN	180~280	⩾340	-

Grade	Chemical composition%
	C	Si	Mn	P	S	Alt
B340/590DPE+Z,B340/590DPE+ZN	≤0.18	≤0.80	≤2.20	≤0.035	≤0.030	⩾0.020
B400/780DPE+Z,B400/780DPE+ZN	≤0.20	≤0.80	≤2.50	≤0.035	≤0.030	⩾0.020

Grade	Mechanical properties
	YS(MPa)	TS(MPa)	EL%
B340/590DPE+Z,B340/590DPE+ZN	340~500	⩾590	⩾16
B400/780DPE+Z,B400/780DPE+ZN	400~590	⩾780	-

Grade	Chemical composition%
	C	Mn	P	S	Alt	Nb
B340LAE+Z,B340LAE+ZN	≤0.12	≤1.00	≤0.030	≤0.030	⩾0.020	≤0.09
B410LAE+Z,B410LAE+ZN	≤0.20	≤2.00	≤0.030	≤0.030	⩾0.020	≤0.09

Grade	Mechanical properties
	YS(MPa)	TS(MPa)	EL%
B340LAE+Z,B340LAE+ZN	340~460	⩾440	⩾22
B410LAE+Z,B410LAE+ZN	410~560	⩾590	⩾16

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Low-carbon steel

Cold rolled substrate

Grade	Chemical composition%
	C	Si	Mn	P	S	Alt	Ti	Nb
	(≤)	(≤)	(≤)	(≤)	(≤)	(≥)	(≤)	(≤)
DC51D+Z,DC51D+ZF	0.1	—	0.5	0.035	0.035	—	—	—
(St01Z.St02Z.St03Z)	0.1	—	0.5	0.035	0.035	—	—	—
DC52D+Z(St04Z)	0.08	—	0.45	0.03	0.03	—	—	—
DC52D+ZF	0.08	—	0.45	0.03	0.03	—	—	—
DC53D+Z(St05Z)	0.08	—	0.4	0.03	0.03	—	—	—
DC53D+ZF	0.08	—	0.4	0.03	0.03	—	—	—
DC54D+Z(St06Z)	0.01	0.1	0.3	0.025	0.02	0.015	0.1	—
DC54D+ZF	0.01	0.1	0.3	0.025	0.02	0.015	0.1	—
DC56D+Z(St07Z)	0.01	0.1	0.3	0.025	0.02	0.015	0.1	0.1
DC56D+ZF	0.01	0.1	0.3	0.025	0.02	0.015	0.1	0.1

Grade	Mechanical properties
	YS(MPa)	TS(MPa)	EL%
DC51D+Z(St01Z,St02Z,St03Z), DC51D+ZF	—	270~500	≥20
DC52D+Z(St04Z), DC52D+ZF	140~300	270~420	≥24
DC53D+Z(St05Z), DC53D+ZF	140~260	270~380	≥28
DC54D+Z(St06Z), DC54D+ZF	140~220	270~350	≥32

Hot rolled substrate

Grade	Chemical composition%
	C	Si	Mn	P	S	Alt	Ti	Nb
	(≤)	(≤)	(≤)	(≤)	(≤)	(≥)	(≤)	(≤)
DD51D+Z(St01ZR, St02ZR)	0.1	—	0.5	0.035	0.035	—	—	—
DD54D+Z(St06ZR)	0.01	0.1	0.3	0.025	0.02	0.015	0.1	—

Grade	Mechanical properties
	YS(MPa)	TS(MPa)	EL(MPa)
DC56D+Z(St07Z)	120~180	270-350	≥38
DC56D+ZF	120~180	270-350	≥36

Structural steel

Grade	Chemical composition%
	C	Si	Mn	P	S	Alt
	(≤)	(≤)	(≤)	(≤)	(≤)	(≥)
S220GD+Z, S220GD+ZF	0.13	—	0.5	0.035	0.035	0.015
S250GD+Z, S250GD+ZF	0.16	—	0.6	0.035	0.035	0.015
S280GD+Z(StE280-2Z), S280GD+ZF	0.2	—	0.8	0.035	0.035	0.015
S320GD+Z, S320GD+ZF	0.23	—	1	0.035	0.035	0.015
S350GD+Z(StE345-2Z), S350GD+ZF	0.25	—	1.5	0.035	0.035	0.015
S550GD+Z, S550GD+ZF	0.25	—	1.5	0.035	0.035	—

Grade	Mechanical properties
	YS(MPa)	TS(MPa)	EL%
S220GD+Z, S220GD+ZF	≥220	≥300	≥18
S250GD+Z, S250GD+ZF	≥250	≥330	≥17
S280GD+Z(StE280-2Z), S280GD+ZF	≥280	≥360	≥16
S320GD+Z, S320GD+ZF	≥320	≥390	≥15
S350GD+Z(StE345-2Z), S350GD+ZF	≥350	≥420	≥14
S550GD+Z, S550GD+ZF	≥550	≥560	—

High strength cold forming steel

Cold rolled substrate

Grade	Chemical composition%
	C(≤)	Si(≤)	Mn(≤)	P(≤)	S(≤)	Alt(≥)	Ti(≤)	Nb(≤)
H220PD+Z, H220PD+ZF	0.08	0.5	0.7	0.08	0.025	0.015	—	—
H260PD+Z, H260PD+ZF	0.15	0.5	0.7	0.1	0.025	0.01	—	—
H300LAD+Z, H300LAD+ZF	0.1	0.5	1	0.03	0.025	0.015	0.015	0.09
H340LAD+Z(HSA340Z), H340LAD+ZF	0.1	0.5	1	0.03	0.025	0.015	0.015	0.09
H380LAD+Z	0.16	0.5	1.5	0.03	0.025	0.015	0.015	0.09
H420LAD+Z(HSA410Z)	0.16	0.5	1.5	0.03	0.025	0.015	0.015	0.09
H180BD+Z, H180BD+ZF	0.04	0.5	0.7	0.06	0.025	0.02	—	—
H220BD+Z, H220BD+ZF	0.06	0.5	0.7	0.08	0.025	0.02	—	—
H260BD+Z, H260BD+ZF	0.08	0.5	0.7	0.1	0.025	0.02	—	—
H180YD+Z, H180YD+ZF	0.01	0.1	0.7	0.06	0.025	0.02	0.12	—
H220YD+Z, H220YD+ZF	0.01	0.1	0.9	0.08	0.025	0.02	0.12	—
H260YD+Z, H260YD+ZF	0.01	0.1	1.6	0.1	0.025	0.02	0.12	—

Grade	Mechanical properties
	YS(MPa)	TS(MPa)	EL%(≥)
H220PD+Z, H220PD+ZF	220~320	340~420	32
H260PD+Z, H260PD+ZF	260-340	380~440	28
H300LAD+Z, H300LAD+ZF	300~380	380~480	23
H340LAD+Z(HSA340Z), H340LAD+ZF	340~420	410~510	21
H380LAD+Z	380~480	440-560	19
H420LAD+Z(HSA410Z)	420~520	470-590	17
H180YD+Z, H180YD+ZF	180~240	340~400	34
H220YD+Z, H220YD+ZF	220~280	340~410	32
H260YD+Z, H260YD+ZF	260~320	380~440	30
H180BD+Z, H180BD+ZF	180~240	300-360	34
H220BD+Z, H220BD+ZF	220~280	340~400	32
H260BD+Z, H260BD+ZF	260~320	360~440	28

Hot rolled substrate

Grade	Chemical composition%
	C(≤)	Si(≤)	Mn(≤)	P(≤)	S(≤)	Alt(≥)	Ti(≤)	Nb(≤)
DD51D+Z(St01ZR,St02ZR)	0.1	—	0.5	0.035	0.035	—	—	—
DD54D+Z(St06ZR)	0.01	0.1	0.3	0.025	0.02	0.015	0.01	—
HR340LAD+Z(HSA340ZR)	0.1	0.2	1	0.03	0.025	—	—	0.09
HR420LAD+Z(HSA410ZR)	0.12	0.2	1	0.03	0.025	—	—	0.09

Grade	Mechanical properties
	YS(MPa)	TS(MPa)	EL%(≥)
DD51D+Z(St01ZR,St02ZR)	—	270~500	—
DD54D+Z(St06ZR)	≤260	≤360	36
HR340LAD+Z(HSA340ZR)	≥340	≥410	18
HR410LAD+Z(HSA410ZR)	≥410	≥480	15

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Introduction

Tin mill products comprise of three types of steel sheets: electrolytic tinplate, tin free steel (TFS), and black plate which is uncoated steel. Tinplate is a thin sheet of steel coated with a layer of tin, while TFS is made of a steel base with a thin layer of chromium and chromium oxide deposited on it. These products have an attractive metallic sheen and offer exceptional corrosion resistance and paintability properties.

Features of Tinplate Products

Tinplate products offer exceptional features, including excellent corrosion resistance, which can be tailored by selecting the appropriate coating thickness to meet different requirements. These products also have an outstanding finishing ability, as they can be printed with a range of paints and inks. Additionally, they possess excellent weldability, making them suitable for the production of various cans, including those made by brazing. Tinplate products also exhibit remarkable processability and strength, which can be adjusted by selecting the appropriate quenching and tempering degree to meet specific processing requirements and the desired strength after forming. Lastly, the bright metallic luster of the tinplate surface offers an attractive appearance, which can be further customized by selecting substrates with different surface states to achieve products with varying levels of surface roughness.

Features of TFS Products

Tin free steel (TFS) products boast exceptional features that make them ideal for various applications. These features include excellent paint adhesion properties that far exceed those of electrolytic tinplate (ETP), making TFS suitable for producing Directly-Resist-Drawn (DRD) cans and adhesive bonded cans. Moreover, TFS exhibits outstanding heat resistance, as high-temperature baking does not cause discoloration or deterioration in its material properties. TFS also has excellent resistance to Sulphur Blackening, thanks to the metallic chromium in its composition, which makes it ideal for canning protein-rich foods like fish and helps avoid the need for expensive sulphur-resistant lacquers. Additionally, TFS offers remarkable filiform rust resistance, providing excellent under film corrosion resistance. Lastly, the coating in TFS is not amphoteric, making it highly resistant to alkalis such as detergents and dispersion colors, offering an added advantage in packing such products.

Mechanical Properties of DR Tin Mill Product

Grade	Hardness		YS
	Target Value	Range
DR-7M	71	71±5	520
DR-8	73	73±5	550
DR-8M	73	73±5	580
DR-9	76	76±5	620
DR-9M	77	77±5	660
DR-10	80	80±5	690

Different Features between TFS and ETP

TFS and ETP exhibit various distinguishing features. TFS has a unique surface luster similar to metallic chromium when a similar finish is applied to the substrate steel sheet. It also displays exceptional corrosion resistance when painted and is commonly utilized with both painted surfaces, but may be used without paint internally, depending on the contents. However, it is not compatible with soldering, and its weldability is inferior to ETP, although it can be welded after the removal of its metallic coating layers. Additionally, TFS only has one standardized chromium-coated product, unlike tin which has multiple coating weights available.

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Process characteristics

To achieve a smooth and attractive surface on hot rolled steel plates, it is necessary to use hydrochloric acid for cleaning. This process also helps to level the plate's surface, making it more similar to that of a cold-rolled plate. Pickling is then performed to remove any iron oxide scale, which makes surface defects more visible and easier to address. Thus, it is crucial to prioritize surface quality when controlling the production process.

Product specification

Automobile steel

Grade	Chemical composition%
	C	Si	Mn	P	S	Ti	Nb	Alt
S315MC	≤0.12	≤0.05	≤1.20	≤0.03	≤0.025	–	–	≥0.01
S355MC	≤0.12	≤0.05	≤1.30	≤0.03	≤0.025	≤0.22	≤0.09	≥0.015
S420MC	≤0.12	≤0.05	≤1.50	≤0.03	≤0.025	≤0.22	≤0.09	≥0.015
S460MC	≤0.12	≤0.05	≤1.60	≤0.03	≤0.025	≤0.22	≤0.09	≥0.015
S500MC	≤0.12	≤0.05	≤1.70	≤0.03	≤0.025	≤0.22	≤0.09	≥0.015

Grade	Mechanical properties
	YS(MPa)	TS(MPa)	EL%
S315MC	≥315	390-510	≥24
S355MC	≥355	430-550	≥23
S420MC	≥420	480-620	≥19
S460MC	≥460	520-670	≥17
S500MC	≥500	550-700	≥14

Baosteel New Standard BZJ307-2006

Grade	Chemical composition%
	C	Si	Mn	P	S	Alt
HR340	≤0.15	–	≤1.00	≤0.025	≤0.035	–
HR380	≤0.12	≤0.5	≤1.40	≤0.03	≤0.025	–
340XLF	≤0.15	–	≤1.00	≤0.040	≤0.05	–
050XLF	≤0.13	–	≤0.90	–	–	–
HR1	≤0.10	–	≤0.50	≤0.025	≤0.020	≥0.015
HR2	≤0.10	–	≤0.50	≤0.025	≤0.020	≥0.020
HR3	≤0.08	–	≤0.50	≤0.025	≤0.020	≥0.020

Grade	Mechanical properties
	YS(MPa)	TS(MPa)	EL%
HR340	340-450	≥410	≥22
HR380	≥380	450-590	≥18
340XLF	≥340	≥410	≥22
050XLF	≥340	≥410	≥22
HR1	210-320	≥310	≥30
HR2	180-290	≥270	≥34
HR3	180-260	≥270	≥38

Steel for automobile wheel net

Baosteel's HR60 wheel net steel trial exhibits several remarkable features, including exceptional strength, outstanding fatigue resistance, superior surface quality, and impressive welding capabilities.

Grade	Chemical composition%
	C	Si	Mn	P	S	Alt	Nb
HR60	≤0.16	≤0.50	≤1.60	≤0.030	≤0.025	0.010-0.06	≤0.06

Grade	Mechanical properties
	YS(MPa)	TS(MPa)	EL%
HR60	450-550	550-650	≥24

Dual phase steel DP600 for automobile

The steel's microstructure comprises a soft ferrite matrix with a fine and dispersed hard phase of martensite or bainite (typically around 15%). As a result, the steel exhibits a yield strength ratio of ≤ 0.75 and displays an excellent balance between strength and plasticity, with high elongation and work hardening rate. These characteristics facilitate superior deep drawing performance and reasonable reaming performance.

Grade	Chemical composition%
	C	Si	Mn	P	S	Alt	Nb	Ti
DP600	≤0.12	≤1.50	≤1.50	≤0.030	≤0.010	0.02-0.06	≤1.00	–

Grade	Mechanical properties
	YS(MPa)	TS(MPa)	EL%
DP600	330-450	≥580	≥24

High reaming steel for automobile

Grade	Chemical composition%
	C	Si	Mn	P	S	Alt	Nb	Ti
BR340/540HE	≤0.06	0.30-1.00	1.0-2.0	≤0.030	≤0.020	≥0.015	0.01-0.07	0.01-0.07
BR440/590HE	≤0.06	0.30-1.00	1.0-2.0	≤0.030	≤0.020	≥0.015	0.01-0.07	0.01-0.07

Grade	Mechanical properties
	YS(MPa)	TS(MPa)	EL%
BR340/540HE	390-540	≥540	20-34
BR440/590HE	440-600	≥590	18-32

 

Heat treated high strength steel

Super high strength steel, treated with heat and formed through hot stamping technology, has resulted in a significant strength improvement (up to 1500Mpa) in processed automobile parts. Baosteel has successfully developed this technology, and is now supplying heat-treated steel plates in large quantities. These plates are primarily used for processing structural parts that require high levels of safety, such as the middle pillar, door reinforcing bar, front and rear bumper, and other similar products. By utilizing this technology, automobile safety can be significantly enhanced.

Grade	Chemical composition%
	C	Si	Mn	P	S	Alt
BR1500HS	0.18-0.22	≤0.40	1.0-1.5	≤0.025	≤0.01	0.01-0.04

Grade	Mechanical properties
	YS(MPa)	TS(MPa)	EL%
BR1500HS	320-1200	≥1570	≥16

Characteristics of pickling products

Pickling products possess several notable features that can be beneficial to enterprises seeking to reduce costs. For instance, hot rolled pickling plates can replace corresponding cold rolled plates, resulting in significant cost savings. Moreover, these plates have an improved surface quality compared to ordinary hot-rolled plates, as the surface scale is removed, which makes them convenient for welding, oiling, and painting. They also offer high dimensional accuracy, with leveling reducing any deviation of unevenness. Finally, the surface finish of pickling products is significantly enhanced, resulting in a better appearance effect.

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Product description

The advanced steelmaking, rolling, and heat treatment processes developed by Baosteel have resulted in a series of ultra-high strength structural steel products. These products exhibit excellent low-temperature toughness, weldability, and cold formability in addition to their ultra-high strength. They also have stable and uniform performance, as well as good shape and surface quality. These products are suitable for use in various industries, such as the manufacturing of engineering machinery, crane, pump truck, and vehicle structures.

Manufacturing process and delivery status

BS series ultra-high strength steel is produced by smelting killed steel in an oxygen converter and refining it outside the furnace. The resulting continuous casting billet is then reheated and rolled into coils using a controlled rolling and cooling process at the hot rolling plant. After this, the plate undergoes refining, straightening, and cutting. Based on the required performance, the appropriate heat treatment process is chosen, and the steel is delivered in its treated state.

Material Grade/Composition and Properties

Grade	Chemical composition%					Mechanical properties
	C	Si	Mn	S	Alt	YS(MPa)	TS(MPa)	EL(%)
BS800QC	≤0.12	≤0.50	≤2.00	≤0.010	≥0.015	≥800	≥850	≥10
BS900QC	≤0.12	≤0.50	≤2.00	≤0.010	≥0.015	≥900	≥950	≥10
BS960QC	≤0.12	≤0.50	≤2.00	≤0.010	≥0.015	≥960	≥980	≥8

Grade	Chemical composition%
	C	Si	Mn	Cr	Mo	P	S	Alt	B
BS900D	≤0.20	≤0.50	≤2.00	≤1.00	≤1.00	≤0.015	≤0.005	≥0.015	≤0.005
BS960D	≤0.20	≤0.50	≤2.00	≤1.00	≤1.00	≤0.015	≤0.005	≥0.015	≤0.005
BS1100D	≤0.22	≤0.50	≤2.00	≤1.00	≤1.00	≤0.015	≤0.005	≥0.015	≤0.005
BS1300D	≤0.30	≤0.50	≤2.00	≤1.00	≤1.00	≤0.015	≤0.005	≥0.015	≤0.005

Grade	Mechanical properties
	YS(MPa)	TS(MPa)	EL(%)
BS900D	≥900	≥950	≥12
BS960D	≥960	≥980	≥10
BS1100D	≥1100	≥1250	≥8
BS1300D	≥1300	≥1350	≥8

Grade	Chemical composition%
	C	Si	Mn	Cr	Mo	P	S	Alt	B
BS900E	≤0.20	≤0.50	≤2.00	≤1.00	≤1.00	≤0.015	≤0.005	≥0.015	≤0.005
BS960E	≤0.20	≤0.50	≤2.00	≤1.00	≤1.00	≤0.015	≤0.005	≥0.015	≤0.005
BS1100E	≤0.22	≤0.50	≤2.00	≤1.00	≤1.00	≤0.015	≤0.005	≥0.015	≤0.005

Grade	Mechanical properties
	YS(MPa)	TS(MPa)	EL(%)
BS900E	≥900	≥950	≥12
BS960E	≥960	≥980	≥10
BS1100E	≥1100	≥1250	≥8

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