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Type A—This steel is dent-resistant and does not require baking or hardening. Its yield strength is increased through work hardening caused by strain during forming.
| Grade | YS(MPa) | TS(MPa) | EL（%） | n |
SAE J2340-180A | 180 | 310 | 40 | 0.2 |
SAE J2340-210A | 210 | 330 | 38 | 0.19 |
SAE J2340-250A | 250 | 355 | 36 | 0.18 |
SAE J2340-280A | 280 | 375 | 36 | 0.16 |
Type B steel is a unique type of steel that exhibits exceptional dent resistance and can be further strengthened through a bake-hardening process. During the forming stage, the steel undergoes work hardening due to the strain applied, and additional strengthening occurs during the subsequent paint baking process. This bake-hardenable steel is known for its superior performance in automotive and other applications where dent resistance is critical.
| Grade | YS(MPa) | TS(MPa) | EL（%） | n |
SAE J2340-180B | 180 | 300 | 39 | 0.19 |
SAE J2340-210B | 210 | 320 | 37 | 0.17 |
SAE J2340-250B | 250 | 345 | 35 | 0.16 |
SAE J2340-280B | 280 | 365 | 35 | 0.15 |
Often known as High Strength Low Alloy (HSLA) steels, Type X and Y are both composed of alloys with high strength, containing elements that form carbides and nitrides, such as niobium (columbium), titanium, and vanadium, either individually or in combination. To enhance formability and weldability, the carbon content must not exceed 0.13%, while phosphorus should be limited to 0.060% or less. The minimum requirement for niobium (columbium), titanium, or vanadium is set at 0.005%, and sulfur must be kept below a maximum of 0.015%.
| Grade | YS(MPa) | TS(MPa) |
SAE J2340-300X | 300-400 | ≥370 |
SAE J2340-300Y | 300-400 | ≥400 |
SAE J2340-340X | 340-440 | ≥410 |
SAE J2340-340Y | 340-440 | ≥440 |
SAE J2340-380X | 380-480 | ≥450 |
SAE J2340-380Y | 380-480 | ≥480 |
SAE J2340-420X | 420-520 | ≥490 |
SAE J2340-420Y | 420-520 | ≥520 |
SAE J2340-490X | 490-590 | ≥560 |
SAE J2340-490Y | 490-590 | ≥590 |
SAE J2340-550X | 550-680 | ≥620 |
SAE J2340-550Y | 550-680 | ≥650 |
Type R steel is known for its high strength, which is achieved through cold work and alloying elements similar to Types S and X. It has a low carbon content of 0.13% to improve formability and welding, while phosphorus and sulfur are limited to 0.100% and 0.015%, respectively. This steel is ideal for bending and roll-forming due to its directional mechanical properties, although its ductility and formability are somewhat restricted.
| Grade | YS(MPa) | TS(MPa) | EL(%) |
SAE J2340-490R | 490-590 | ≥500 | ≥13 |
SAE J2340-550R | 550-650 | ≥560 | ≥10 |
SAE J2340-700R | 700-800 | ≥710 | ≥8 |
SAE J2340-830R | 830-960 | ≥860 | ≥2 |
Type DH & DL steel is characterized by its ultra high strength and dual phase microstructure composed of ferrite and martensite. The strength of this steel is determined by the percentage of low-carbon martensite present in the microstructure.
| Grade | YS(MPa) | TS(MPa) |
SAE J2340-500DL | ≥300 | ≥500 |
SAE J2340-600DH | ≥500 | ≥600 |
SAE J2340-600DL1 | ≥350 | ≥600 |
SAE J2340-600DL2 | ≥280 | ≥600 |
SAE J2340-700DH | ≥550 | ≥700 |
SAE J2340-800DL | ≥500 | ≥800 |
SAE J2340-950DL | ≥550 | ≥950 |
SAE J2340-1000DL | ≥700 | ≥1000 |
Type M steel refers to fully martensitic ultra high strength sheet steels, where the strength level is determined by the carbon content. These steels are known for their high strength, but they have limited ductility.
| Grade | YS(MPa) | TS(MPa) |
SAE J2340-800M | ≥600 | ≥800 |
SAE J2340-900M | ≥750 | ≥900 |
SAE J2340-1000M | ≥750 | ≥1000 |
SAE J2340-1100M | ≥900 | ≥1100 |
SAE J2340-1200M | ≥950 | ≥1200 |
SAE J2340-1300M | ≥1050 | ≥1300 |
SAE J2340-1400M | ≥1150 | ≥1400 |
SAE J2340-1500M | ≥1200 | ≥1500 |
SAE J2340 300XF | ASTM A653 DDS Type C-G40 |
SAE J2340 340XF | ASTM A653 DDS Type C-G60 |
SAE J2340 420XF | ASTM A653 DDS Type C-G90 |
SAE J2340 490XF | ASTM A653 DDS Type C-G100 |
SAE J2340 550XF | SAE1015 |
ASTM A-1011M HSLAS-F Grade30 | SAE1020 |
ASTM A-1011M HSLAS-F Grade33 | SAE1035 |
ASTM A-1011M HSLAS-F Grade36 | SAE1045 |
ASTM A-1011M HSLAS-F Grade40 | SAE1050 |
ASTM A-1011M HSLAS-F Grade45 | SAE1055 |
ASTM A-1011M HSLAS-F Grade50 | SAE1018 |
ASTM A-1011M HSLAS-F Grade55 | SAE1020 |
ASTM A-1011M HSLAS-F Grade60 | SAE1022 |
ASTM A-1011M HSLAS-F Grade70 | SAE1035 |
ASTM A-1011M HSLAS-F Grade80 | SAE1045 |
ASTM A653 DDS Type A | SAE1050 |
ASTM A653 DDS Type B | SAE1055 |
ASTM A653 DDS Type C-G30 | SAE1070 |
ASTM A653 DDS Type C-G40 | SAE1070 |
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