Features and Applications

Spring steel made with Si-Mn alloy is the most commonly utilized type. A high concentration of silicon enhances the malleability of the steel, making it easier to process into parts for automobile springs. Conversely, a greater amount of manganese can increase the steel's toughness and firmness. This type of steel is employed in the production of various elastic components, such as those found in winding devices.

Chemical Composition and Mechanical Properties

Grade	Chemical composition%
	C	Si	Mn	S	P	Cr
50CrV4	0.47-0.55	≤0.40	0.70-1.10	≤0.015	≤0.025	0.90-1.20
65Mn	0.62-0.70	0.17-0.37	0.90-1.20	≤0.015	≤0.025	≤0.30
SUP6	0.56-0.64	1.5-1.8	0.7-1.0	≤0.015	≤0.025	–
SUP10	0.47-0.55	0.15-0.35	0.65-0.95	≤0.015	≤0.025	–
60Si2MnA	0.56-0.64	1.60-2.00	0.70-1.00	≤0.015	≤0.025	–
C67S	0.65-0.72	0.15-0.35	0.60-0.90	≤0.015	≤0.025	–

Grade	Mechanical properties
	Hot-rolled hardnessHV	Annealed hardnessHV	Quenching hardnessHRC
50CrV4	≤350	≤180	≥54
65Mn	≤360	≤180	≥56
SUP6	≤360	≤180	≥56
SUP10	≤350	≤180	≥54
60Si2MnA	≤360	≤180	≥56
C67S	≤350	≤180	≥56

Manufacture process and delivery condition

The manufacturing process for BT steels involves killing the steel in an oxygen converter, followed by refining and continuous casting. The resulting slabs are reheated and rolled into coils using the TMCP rolling process. Upon inspection, the BT steels are available for delivery in either coil form or as sheets that have undergone powerful leveling and cutting. The steels can be delivered in various conditions, including TMCP, quenched, annealed, quenched and tempered, etc. Additionally, processing and distribution services are available to meet customers' specific requirements, such as steel plates delivered with pretreatment like blasting.

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Features and Applications

Alloy tool steel is a type of steel that has been enhanced with alloying elements to improve its wear resistance and toughness, making it superior to carbon tool steel. Its exceptional properties make it the preferred choice for cutting tools. Alloy tool steel is commonly utilized in the production of cutlery, saws, circular saws, and re-rolling applications.

Material Grade/Chemical Composition and Mechanical Properties

Grade	Chemical composition%
	C	Si	Mn	S	P	Cr
75Cr1	0.72-0.80	0.20-0.45	0.60-0.90	≤0.015	≤0.025	0.30-0.60
8CrV/80CrV2	0.75-0.85	0.20-0.40	0.30-0.60	≤0.015	≤0.025	0.40-0.70

Grade	Mechanical properties
	Hot-rolled hardnessHV	Annealed hardnessHV	Quenching hardnessHRC
75Cr1	≤370	≤180	≥55
8CrV/80CrV2	≤370	≤180	≥56

Manufacture process and delivery condition

The manufacturing process of BT steels involves killing them in an oxygen converter. Once refined and continuously cast, the slabs are reheated and rolled into coils through the use of TMCP rolling process. After thorough inspection, the BT steels can be delivered in the form of either coils or sheets that have undergone powerful leveling and cutting.
In terms of delivery condition, these steels can be provided in a variety of conditions such as TMCP, quenched, annealed quenched and tempered, and more.
To meet specific customer requirements, steel plates can be delivered with pretreatment, such as blasting. Processing and distribution services are available to ensure that the end products meet the needs of the customer.

If you are interested in our products, please feel free to contact us, we look forward to establishing a long-term cooperative relationship with you and developing together!

Features and Applications

Alloy structural steel is extensively utilized for manufacturing various machine components. By incorporating different proportions of Mn, Cr, Ni, Mo, V, and other alloys, the material's hardenability and tempering properties can be enhanced. One of the typical alloy structural steel produced by Baosteel is Cr-Mo steel, which possesses excellent hardenability, resistance to tempering, and high toughness. On the other hand, Mn-B steel is also a good option for high hardenability alloy structural steel. The addition of a small amount of boron significantly improves the hardenability of the material, making Mn-B steel a cost-effective alternative to other alloy steels in some applications. Premium SUV drive shafts, balance bars, and other automobile parts such as chains, seat adjustment systems, clutch plates, and re-rolling are common areas where Mn-B steels are utilized.

Chemical Composition and Mechanical Properties

Grade	Chemical composition%
	C	Si	Mn	S	P
15Cr	0.12-0.18	0.17-0.37	0.40-0.70	≤0.015	≤0.025
20Cr	0.18-0.24	0.17-0.37	0.40-0.70	≤0.015	≤0.025
40Cr	0.37-0.44	0.17-0.37	0.50-0.80	≤0.015	≤0.025

Grade	Mechanical properties
	Hot-rolled hardnessHV	Annealed hardnessHV	Quenching hardnessHRC
15Cr	≤250	≤170	≥34
20Cr	≤260	≤170	≥35
40Cr	≤300	≤180	≥47

Grade	Chemical composition%
	C	Si	Mn	S	P	Cr	Ni
SNCM220	0.17-0.23	0.15-0.35	0.60-0.90	≤0.015	≤0.025	0.40-0.65	0.40-0.70
H42B	0.37-0.45	0.17-0.37	0.70-1.00	≤0.015	≤0.025	≤0.25	≤0.20
20MnB5	0.17-0.23	≤0.40	1.10-1.40	≤0.015	≤0.025	–	≤0.20
26MnB5	0.23-0.28	≤0.40	1.10-1.40	≤0.015	≤0.025	0.10-0.20	≤0.20
27MnCrB5	0.24-0.30	≤0.40	1.10-1.40	≤0.015	≤0.025	≤0.60	≤0.20
40MnB	0.37-0.44	0.17-0.37	1.10-1.40	≤0.015	≤0.025	–	–
16MnCr5	0.14-0.19	≤0.40	1.10-1.30	≤0.015	≤0.025	0.80-1.10	–

Grade	Mechanical properties
	Hot-rolled hardnessHV	Annealed hardnessHV	Quenching hardnessHRC
H42B	≤300	≤180	≥50
20MnB5	≤270	≤170	≥45
26MnB5	≤280	≤170	≥46
27MnCrB5	≤280	≤170	≥48
40MnB	≤300	≤180	≥50
16MnCr5	≤270	≤170	≥35

Grade	Chemical composition%
	C	Si	Mn	S	P	Cr	Mo
15CrMo	0.12-0.18	0.17-0.37	0.40-0.70	≤0.015	≤0.025	0.80-1.10	0.40-0.55
20CrMo	0.17-0.24	0.17-0.37	0.40-0.70	≤0.015	≤0.025	0.80-1.10	0.15-0.25
30CrMo	0.26-0.34	0.10-0.30	0.40-0.70	≤0.015	≤0.025	0.80-1.10	0.15-0.25
35CrMo	0.32-0.40	0.17-0.37	0.40-0.70	≤0.015	≤0.025	0.80-1.10	0.15-0.25
34CrMo4	0.30-0.37	≤0.40	0.60-0.90	≤0.015	≤0.025	0.90-1.20	0.15-0.30
42CrMo4	0.38-0.45	≤0.40	0.60-0.90	≤0.015	≤0.025	0.90-1.20	0.15-0.30

Grade	Mechanical properties
	Hot-rolled hardnessHV	Annealed hardnessHV	Quenching hardnessHRC
15CrMo	≤260	≤170	≥37
20CrMo	≤270	≤170	≥38
30CrMo	≤300	≤180	≥47
35CrMo	≤310	≤180	≥50
34CrMo4	≤310	≤180	≥50
42CrMo4	≤320	≤180	≥52

Grade	Chemical composition%
	C	Si	Mn	S	P	Cr	Ni
20CrMnTi	0.17-0.23	0.17-0.37	0.80-1.10	≤0.015	≤0.025	1.10-1.30	≤0.20
40CrMn	0.37-0.45	0.17-0.37	0.90-1.20	≤0.015	≤0.025	0.90-1.20	–
50Mn2V	0.48-0.57	≤0.30	1.40-1.80	≤0.015	≤0.025	≤0.30	–

Grade	Mechanical properties
	Hot-rolled hardnessHV	Annealed hardnessHV	Quenching hardnessHRC
20CrMnTi	≤280	≤170	≥36
40CrMn	≤300	≤180	≥48
50Mn2V	≤350	≤180	–

Manufacture process and delivery condition

The BT steels undergo a manufacturing process where they are first killed in an oxygen converter. They are then refined and continuously cast into slabs, which are reheated and rolled into coils using the TMCP rolling process. After passing inspection, the BT steels are delivered in either coil form or as sheets that have undergone powerful leveling and cutting. The delivery condition can be TMCP, quenched, annealed, quenched and tempered, and so on. Additionally, steel plates can be delivered with pretreatments such as blasting, based on the customer's specifications for processing and distribution services.

If you are interested in our products, please feel free to contact us, we look forward to establishing a long-term cooperative relationship with you and developing together!

Features and Applications

Carbon tool steel is a popular material choice for enhancing strength and wear resistance compared to carbon steel. Hardening and tempering treatment is typically necessary for carbon tool steel. To prevent cracking during the quenching process, it is recommended to use either oil quenching or salt bath quenching. Carbon tool steel finds its application in various areas such as saws, blades, knives, agricultural machine parts, and re-rolling processes.

Chemical Composition and Mechanical Properties

Grade	Chemical composition%
	C	Si	Mn	S	P
SAE1078	0.72-0.86	0.15-0.30	0.30-0.60	≤0.015	≤0.025
SK5	0.80-0.90	≤0.35	≤0.50	≤0.015	≤0.025

Grade	Mechanical properties
	Hot-rolled hardnessHV	Annealed hardnessHV	Quenching hardnessHRC
SAE1078	≤360	≤180	≥60
SK5	≤370	≤180	≥60

Workmanship and Delivery Conditions

BT steels are produced through a process where they are killed in an oxygen converter. Following refinement and continuous casting, the slabs are reheated and rolled into coils using the TMCP rolling process. After undergoing inspection, the BT steels are made available for delivery in either coil or sheet form, with the added benefit of powerful leveling and cutting capabilities. These steels can be delivered in a variety of conditions, such as TMCP, quenched, annealed, quenched and tempered, among others. We also offer processing and distribution services tailored to the specific requirements of our customers, such as pretreatment options like blasting for steel plates.

If you are interested in our products, please feel free to contact us, we look forward to establishing a long-term cooperative relationship with you and developing together!

Characteristic and Application

Carbon steel is a commonly used material for constructing machine structures, particularly in the automobile and machinery industries. This type of steel is desirable for its affordability, ease of processing, and excellent mechanical properties following heat treatment.

This material finds application in the production of mechanical and automobile parts, including chains, friction plates, and re-rolling processes.

S15C, which can be spheroidized annealed to improve formability. This makes it suitable for use in the seat adjustment systems of machinery, where fine-blanking processes are required.

S35C, has good hardenability and properties that can be adjusted through various heat treatment methods. Higher carbon content in steel can lead to increased strength after heat treatment, but there is also an increased risk of distortion and cracking.

Chemical Composition and Mechanical Properties

Grade	Chemical composition%
	C	Si	Mn	S	P
S10C	0.08-0.13	0.15-0.35	0.30-0.60	≤0.015	≤0.025
S15C	0.13-0.18	0.15-0.35	0.30-0.60	≤0.015	≤0.025
S20C	0.18-0.23	0.15-0.35	0.30-0.60	≤0.015	≤0.025
S35C	0.32-0.38	0.15-0.35	0.60-0.90	≤0.015	≤0.025
S45C	0.42-0.48	0.15-0.35	0.60-0.90	≤0.015	≤0.025
S50C	0.47-0.53	0.15-0.35	0.60-0.90	≤0.015	≤0.025
S55C	0.52-0.58	0.15-0.35	0.60-0.90	≤0.015	≤0.025
SAE1018	0.14-0.20	0.15-0.30	0.60-0.90	≤0.015	≤0.025
SAE1020	0.17-0.23	0.15-0.30	0.30-0.60	≤0.015	≤0.025
SAE1035	0.31-0.38	0.15-0.30	0.60-0.90	≤0.015	≤0.025
SAE1045	0.42-0.50	0.15-0.30	0.60-0.90	≤0.015	≤0.025
SAE1050	0.47-0.55	0.15-0.30	0.60-0.90	≤0.015	≤0.025
SAE1055	0.52-0.60	0.15-0.30	0.60-0.90	≤0.015	≤0.025
SAE1070	0.65-0.80	0.15-0.30	0.60-0.90	≤0.015	≤0.025

Grade	Mechanical properties
	Hot-rolled hardnessHV	Annealed hardnessHV	Quenching hardnessHRC
S35C	≤250	≤150	≥45
S45C	≤260	≤160	≥52
S50C	≤270	≤160	≥54
S55C	≤280	≤170	≥55
SAE1035	≤250	≤150	≥45
SAE1045	≤260	≤160	≥52
SAE1050	≤280	≤160	≥54
SAE1055	≤300	≤170	≥55
SAE1070	≤350	≤180	≥58

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Product description

Hot rolled plates were utilized to heat treat the steels, resulting in their exceptional ballistic performance, uniform properties, and superior shape and surface quality. These steels are well-suited for applications requiring high levels of ballistic performance, including armored cars, armored personnel carriers, VIP cars, escort vehicles, security doors, bank counter shields, strongboxes, helmets, and shields, among others.

Manufacturing process and delivery conditions

The manufacturing process of the steel involves utilizing an oxygen converter, fully killing the material, secondary refining it, and casting it into slabs. These slabs are then reheated and rolled into coils using a TMCP rolling process. The resulting BP plates undergo a series of steps including powerful leveling, cutting, heat treatment, and inspection before being delivered in sheet form. The plates are available in a variety of delivery conditions, such as TMCP, quenched, and quenched and tempered, among others.

To meet the specific requirements of customers, the steel plates can be delivered with pretreatments like blasting and painting. Additionally, services such as blanking, bending, and machining are also provided.

Chemical composition

Grade	Chemical composition%
	C	Si	Mn	P	S	Alt	Cr	Ni	B	CEV
BP300	≤0.22	≤0.5	≤2.0	≤0.020	≤0.015	≥0.015	≤0.5	≤0.5	≤0.005	0.6
BP370	≤0.32	≤0.5	≤1.5	≤0.020	≤0.015	≥0.015	≤1.0	≤0.5	≤0.005	0.52
BP440	≤0.35	≤1.0	≤1.85	≤0.020	≤0.015	≥0.015	≤1.0	≤0.5	≤0.005	0.55
BP500	≤0.50	≤0.5	≤1.70	≤0.020	≤0.015	≥0.015	≤1.2	≤0.8	≤0.005	0.62
BP600	≤0.50	≤1.0	≤1.85	≤0.020	≤0.015	≥0.015	≤1.2	≤0.8	≤0.005	0.67

Mechanical properties

Grade	Mechanical properties
	YS(MPa)	TS(MPa)	EL%
BP300	≥700	≥900	≥10
BP370	≥900	≥1050	≥10
BP440	≥1100	≥1250	≥8
BP500	≥1250	≥1450	≥8
BP600	≥1450	≥1750	≥6

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By utilizing wear-resistant steel for the dump truck body, it is possible to reduce its weight by 30-50% as compared to an ordinary steel structure. The use of this type of steel provides the truck body with high strength, rigidity, and toughness, making it resistant to impacts and dents while also improving its abrasion resistance and ensuring a long service life. Baosteel offers a comprehensive range of technical support services, including recommendations for materials, processing, welding, and lightweight design, to further enhance the performance of the truck body.

Material Grades and Typical Applications

Grade	Product Features:
Wear resistent steel
BW300	Low grade, apply to road dump truck body, etc.
BW450, BW500	High grade, apply to mining dump truck body, etc.
BW300TP	Easy forming wear resistent steel, apply to concrete mixer tank body, etc
High strength steel
B650XT, B700XT, B800XT	High strength steel plate, with good plasticity,easy processing, easy welding,       high strength and durable, suitable for the modification of the truck body cold formed tube,            side panels, frame structure, crashproof beam and so on.

Mechanical properties of XT high-strength steel

Grade	Mechanical properties
	YS(MPa)	TS(MPa)	EL%
B650XT	≥600	≥650	≥11
B700XT	≥620	≥700	≥11
B800XT	≥700	≥800	≥11

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Application

There are two types of steel suitable for producing axle housing for different types of vehicles. The first type is a cold forming steel with high strength, good weldability, and ease of forming. This type of steel is efficient to use in the production of light truck axle housing. The second type of steel is a hot stamping steel with a specially designed microstructure that ensures high strength and good fatigue performance after the hot stamping forming process. This type of steel is suitable for use in thick axle housing of heavy trucks and can reduce weight. Additionally, this steel has been certified by a well-known German commercial vehicle company.

Material grades and mechanical properties

Grade	Mechanical properties
	YS(MPa)	TS(MPa)	EL%
Steel for Shaft Tube
B600QZR	≥550	600-760	≥14
B700QZR	≥600	700-850	≥13
B750QZR	≥700	750-900	≥13
Cold Forming for Axle
B440QK	≥295	≥440	≥34
B500QK	≥460	≥500	≥19
B600QK	≥550	≥600	≥15
B700QK	≥600	≥700	≥14
Hot Stamping for Axle
BQT800	≥600	≥750	≥12
BQT800	≥460	≥550	≥21

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Hot rolled pickled steel strips for wheels

Features and uses

This paragraph describes a product known as hot rolled pickled steel strip for wheels. This steel strip is produced using a controlled rolling and cooling process and is microalloyed with low levels of carbon. It possesses exceptional cold formability and weldability, making it highly suitable for use in the production of rims and spokes for automobile wheels.

Material Grades, Composition and Properties

Grade	Chemical composition%
	C	Si	Mn	Nb+Ti
B450CL	≤0.10	≤0.50	≤1.50	≤0.10
B500CL	≤0.10	≤0.50	≤1.50	≤0.10
B550CL	≤0.10	≤0.50	≤1.50	≤0.10
B600CL	≤0.10	≤0.50	≤2.50	≤0.20
B650CL	≤0.10	≤0.50	≤2.50	≤0.20

Grade	Mechanical properties
	YS(MPa)	TS(MPa)	EL%
B450CL	≥320	450-550	≥28
B500CL	≥400	500-600	≥26
B550CL	≥450	550-650	≥24
B600CL	≥500	600-700	≥22
B650CL	≥550	650-750	≥20

Hot rolled dual phase pickled steel strip

Features and uses

The hot rolled dual phase pickled steel strip is a product that is produced using cutting-edge controlled rolling and cooling technology. This steel strip consists of mainly ferrite and martensite in its microstructure. It boasts of a low yield ratio, a high work hardening rate, and an exceptional fatigue property, making it highly suitable for the manufacture of automobile components and reinforcements with complex shapes such as car wheel spokes, longitudinal beams, B pillars, and more. Additionally, this steel strip exhibits excellent cold formability.

Material Grades, Composition and Properties

Grade	Chemical composition%
	C	Si	Mn	P	S	Al
BR330/580DP	≤0.10	≤1.5	≤1.5	≤0.025	≤0.010	≥0.015
BR450/780DP	≤0.10	≤1.5	≤1.5	≤0.025	≤0.010	≥0.015

Grade	Mechanical properties
	YS(MPa)	TS(MPa)	EL%
BR330/580DP	330-470	≥580	≥19
BR450/780DP	450-610	≥780	≥14

Hot rolled pickled strip steel for high reaming

Features and uses

The hot rolled pickled steel strip for high reaming is a product that is manufactured using advanced controlled rolling and cooling technology. This steel strip possesses exceptional formability and welding performance, and a high reaming rate. It finds wide application in the production of automobile parts that require flanging deformation, such as swing arms, wheels, and more.

Material Grades, Composition and Properties

Grade	Chemical composition%
	C	Si	Mn	P	S	Als	Cu	B
SAPH440SF	≤0.10	≤1.00	≤1.50	≤0.020	≤0.010	≤0.010	≤0.40	≤0.006
SAPH540SF	≤0.10	≤1.50	≤1.80	≤0.020	≤0.010	≤0.010	≤0.20	-
SAPH590SF	≤0.10	≤1.50	≤2.20	≤0.020	≤0.010	≤0.010	≤0.20	-
SAPH780SF	≤0.10	≤1.50	≤2.20	≤0.020	≤0.010	≤0.010	≤0.20	-

Grade	Mechanical properties
	YS(MPa)	TS(MPa)	EL%
SAPH440SF	≥440	≥305	≥30
SAPH540SF	≥540	≥355	≥22
SAPH590SF	≥590	≥420	≥20
SAPH780SF	≥780	≥680	≥14

Hot formed hot rolled pickled automobile steel strip

Features and uses

The hot formed hot rolled pickled steel strip is a product that is made of metal that experiences rapid ductility enhancement when exposed to high temperatures in the austenitic zone. The stamping process is carried out using a die, and the stamped parts are quickly cooled (quenched) within the die. This process results in stamping parts that exhibit exceptional strength of over 1200MPa. This product finds typical application in the manufacture of automobile components such as B-pillars, door bumpers, and bumpers, among others.

Material Grades, Composition and Properties

Grade	Chemical composition%
	C	Si	Mn	Nb+Ti
BR1200HS	≤0.3	≤2.2	≤2.5	≤0.10
BR1500HS	≤0.3	≤2.2	≤2.5	≤0.10

Grade	Mechanical properties
	YS(MPa)	TS(MPa)	EL%
BR1200HS	≥280	≤700	≥18
BR1500HS	≥320	≤800	≥18

Multiphase hot-rolled pickling automobile steel strip

Features and uses

The multiphase hot rolled and pickled automobile steel strip is a product that is manufactured using advanced smelting and rolling technologies. Its structure is made up of ferrite, bainite, martensite, and precipitation, with fine grains, high strength, and excellent formability. This product finds wide application in the manufacture of automobile components such as trailing arms, torsion beams, door reinforcements, longitudinal beams, and impact-resistant safety parts.

Material Grades, Composition and Properties

Grade	Chemical composition%
	C	Si	Mn	P	S	Alt	Cr+Mo	Nb+Ti	V
CP800	≤0.18	≤0.8	≤2.2	≤0.08	≤0.015	≤2.0	≤1.0	≤0.15	≤0.20

Grade	Mechanical properties
	YS(MPa)	TS(MPa)	EL%
CP800	680-830	≥780	≥10

Environmentally friendly hot rolled pickled dual phase (DP) steel sheets and strips for automobiles

Features and uses

The green and environment-friendly hot rolled dual phase pickled automobile thin steel strip is a product that comprises fine ferrite and martensite. It exhibits excellent features such as high strength, low yield strength ratio, good plasticity, good formability, and certain BH properties. This product finds typical application in the production of automobile body structures, reinforcements, various stamping parts, anti-collision beams, longitudinal beams, and other safety parts.

Material Grades, Composition and Properties

Grade	Chemical composition%
	C	Si	Mn	P	S	Cr	Al
HR340/590DP	≤0.12	≤0.60	≤1.70	≤0.10	≤0.010	≤1.20	≥0.015
HR420/780DP	≤0.12	≤1.00	≤2.20	≤0.06	≤0.010	≤1.00	≥0.015
HR500/780DP	≤0.12	≤1.00	≤2.20	≤0.06	≤0.010	≤1.00	≥0.015

Grade	Mechanical properties
	YS(MPa)	TS(MPa)	EL%
HR340/590DP	340-460	≥590	≥23
HR420/780DP	420-560	≥780	≥13
HR500/780DP	500-650	≥780	≥11

Hot rolled pickled steel strip with nano precipitation

Features and uses

The nano precipitation pickling steel strip is a product that is produced using advanced smelting and rolling technologies. It consists of ferrite and fine nano precipitation phase (≤ 10nm) in ferrite crystals. This steel strip is characterized by a fine structure, uniform performance, good surface quality, excellent coating performance, high strength, good plasticity, and formability. Moreover, this product exhibits remarkable performance stability even after tempering at high temperatures (≤ 650 ­ ° C). It finds typical application in the production of chassis parts, wheels, various stamping parts, and more.

Material Grades, Composition and Properties

Grade	Chemical composition%
	C	Si	Mn	P	S	Al	Ti	Mo
B780NP	≤0.10	≤0.20	≤2.00	≤0.03	≤0.015	≥0.015	≤0.15	≤0.4

Grade	Mechanical properties
	YS(MPa)	TS(MPa)	EL%
B780NP	680-830	≥780	≥17

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Low Alloy High Strength Pickled Steel Strip for Cold Forming

Low Alloy High Strength Pickled Steel Strip for Cold Forming is a type of steel that has been specifically designed to provide high strength and good formability. The pickling process involves removing any surface scale or oxide layer to provide a clean surface for further processing. The resulting steel strip can be cold-formed into complex shapes without cracking or splitting, making it ideal for applications in the automotive, construction, and manufacturing industries.

Chemical composition

Grade	Chemical composition%
	C	Si	Mn	P	S	Al	Nb	V	Ti	Mo
B600L	≤0.10	≤0.15	≤1.70	≤0.025	≤0.010	≥0.010	≤0.09	≤0.20	≤0.015	-
QStE550TM
S550MC
B650L	≤0.10	≤0.15	≤1.80	≤0.025	≤0.010	≥0.010	≤0.09	≤0.20	≤0.015	-
QStE600TM
S600MC
B700L	≤0.10	≤0.15	≤2.00	≤0.025	≤0.010	≥0.010	≤0.09	≤0.20	≤0.015	-
QStE650TM
S650MC
B750L	≤0.10	≤0.15	≤2.10	≤0.025	≤0.010	≥0.010	≤0.09	≤0.20	≤0.015	≤0.5
QStE700TM
S700MC

Mechanical properties

Grade	Mechanical properties
	YS(MPa)	TS(MPa)	EL%
B600L	≥550	600-760	≥14
QStE550TM
S550MC
B650L	≥600	650-820	≥13
QStE600TM
S600MC
B700L	≥650	700-880	≥12
QStE650TM
S650MC
B750L	≥700	750-950	≥12
QStE700TM
S700MC

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