Automotive steel coil strip automobile steel plate sheet
Q/BQB 310 continuously hot rolled steel sheet and strip for automobile structure use
Grades: SAPH310, SAPH370, SAPH400, SAPH440, SPFH540, SPFH590, SPFH780, B440QZR, B480QZR, QStE340TM, QStE380TM, QStE420TM, QStE460TM, QStE500TM, QStE550TM, QStE600TM, QStE650TM, QStE700TM
Q/BQB 310 standard is applicable to the carbon and microalloy steel hot continuous rolling strip with good cold forming performance, as well as the steel plate and steel strip cut horizontally and vertically. The products are used for manufacturing automobile girders, beams, wheels, automobile transmission shaft tubes, automobile axle housings and other structures.
Grade | Thk | Application |
SAPH310 | ≤16mm | Used for automobile frame, wheel and other automobile structural parts requiring molding processing performance. |
SAPH370, SAPH400, SAPH440 | ≤16mm |
SPFH540, SPFH590 | ≤14mm | Used for automobile frame, wheel and other automobile structural parts requiring good forming and processing performance and high strength. |
SPFH780 | ≤8mm |
QStE340TM, QStE380TM | ≤14mm | Used for structural parts such as automobile girders, square tubes and round tubes that require good cold forming performance and high strength. |
QStE420TM, QStE460TM |
QStE500TM, QSt E550TM |
QStE600TM, QStE650TM | ≤12mm |
QStE700TM |
B440QZR, B480QZR | ≤8mm | For manufacturing automobile transmission shaft tube. |
For hot-rolled pickling surface steel plate and strip, the nominal thickness t ≤ 8.0mm. |

Q/BQB310 Automotive Steel Coil / Sheet Chemical Composition |
Grade | C | Si | Mn | P | S | Alt |
SAPH310 | ≤0.10 | ≤0.30 | ≤0.80 | ≤0.025 | ≤0.020 | ≥0.010 |
SAPH370 | ≤0.21 | ≤0.30 | ≤1.00 | ≤0.025 | ≤0.020 | ≥0.010 |
SAPH400 | ≤0.21 | ≤0.30 | ≤1.40 | ≤0.025 | ≤0.020 | ≥0.010 |
SAPH440 | ≤0.21 | ≤0.30 | ≤1.60 | ≤0.025 | ≤0.020 | ≥0.010 |
SPFH540 | ≤0.15 | ≤0.50 | ≤1.80 | ≤0.025 | ≤0.020 | ≥0.010 |
SPFH590 | ≤0.18 | ≤0.60 | ≤2.00 | ≤0.025 | ≤0.020 | ≥0.010 |
SPFH780 | ≤0.20 | ≤1.00 | ≤2.10 | ≤0.025 | ≤0.020 | ≥0.010 |
B440QZR | ≤0.12 | ≤0.50 | ≤1.30 | ≤0.025 | ≤0.020 |
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B480QZR | ≤0.16 | ≤0.50 | ≤1.50 | ≤0.025 | ≤0.020 |
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Q/BQB310 Automotive Steel Coil / Sheet Chemical Composition |
Grade | C | Mn | Si | S | Ti | Mo | B | Other |
QStE340TM | 0.12 | 1.30 | 0.50 | 0.020 | 0.15 |
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| P 0.025 Alt≥0.015 Nb 0.09 V 0.20 |
QStE380TM | 0.12 | 1.40 | 0.50 | 0.020 | 0.15 |
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QStE420TM | 0.12 | 1.50 | 0.50 | 0.020 | 0.15 |
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QStE460TM | 0.12 | 1.60 | 0.50 | 0.020 | 0.15 |
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QStE500TM | 0.12 | 1.70 | 0.50 | 0.020 | 0.15 |
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QStE550TM | 0.12 | 1.80 | 0.50 | 0.015 | 0.15 |
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QStE600TM | 0.12 | 1.90 | 0.50 | 0.015 | 0.22 | 0.50 | 0.005 |
QStE650TM | 0.12 | 2.00 | 0.60 | 0.015 | 0.22 | 0.50 | 0.005 |
QStE700TM | 0.12 | 2.10 | 0.60 | 0.015 | 0.22 | 0.50 | 0.005 |
Q/BQB310 | Yield Strength | Tensile | Elongation (%) |
Steel | (Mpa) | Strength | ≥1.5 | ≥2 | ≥2.5 | ≥3.15 | ≥4 | Thk |
Grade | Thk<6|6-8|≥8mm | (Mpa) | <2 | <2.5 | <3.15 | <4 | <6.3 | ≥6.3 |
SAPH310 | ≥185|≥185|≥175 | ≥310 | ≥33 | ≥34 | ≥36 | ≥38 | ≥40 | ≥41 |
SAPH370 | ≥225|≥225|≥215 | ≥370 | ≥32 | ≥33 | ≥35 | ≥36 | ≥37 | ≥38 |
SAPH400 | ≥255|≥235|≥235 | ≥400 | ≥31 | ≥32 | ≥34 | ≥35 | ≥36 | ≥37 |
SAPH440 | ≥305|≥295|≥275 | ≥440 | ≥29 | ≥30 | ≥32 | ≥33 | ≥34 | ≥35 |
Q/BQB310 | Yield | Tensile | Elongation (%) |
Grade | Strength | Strength | t<2mm | 2-2.5 | 2.5-3.25 | t≥3.25mm |
SPFH540 | ≥355 Mpa | ≥540 Mpa | ≥21 | ≥22 | ≥23 | ≥24 |
SPFH590 | ≥420 Mpa | ≥590 Mpa | ≥19 | ≥20 | ≥21 | ≥22 |
SPFH780 | ≥675 Mpa | ≥780 Mpa | ≥14 | ≥14 | ≥14 | ≥15 |
Grade | Yield Strength | Tensile Strength | Elongation |
B440QZR | ≥320 Mpa | 440-570 Mpa | ≥15% |
B480QZR | ≥355 Mpa | 480-580 Mpa | ≥21% |
Q/BQB310 | Yield | Tensile | Elongation | Elongation | Equivalent |
Steel | Strength | Strength | t<3mm | t≥ 3mm | Grade |
Grade | (Mpa) | (Mpa) | (%) | (%) |
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QStE340TM | ≥340 | 420-540 | ≥19 | ≥25 | S355MC |
QStE380TM | ≥380 | 450-590 | ≥18 | ≥23 |
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QStE420TM | ≥420 | 480-620 | ≥16 | ≥21 | S420MC |
QStE460TM | ≥460 | 520-670 | ≥14 | ≥19 | S460MC |
QStE500TM | ≥500 | 550-700 | ≥12 | ≥17 | S500MC |
QStE550TM | ≥550 | 600-760 | ≥12 | ≥16 | S550MC |
QStE600TM | ≥600 | 650-820 | ≥11 | ≥15 | S600MC |
QStE650TM | ≥650 | 700-880 | ≥10 | ≥14 | S650MC |
QStE700TM | ≥700 | 750-950 | ≥10 | ≥13 | S700MC |
Standard | Automotive / Automobile Steel Grades |
JIS G3113 | SAPH310 | SAPH370 | SAPH400 | SAPH440 |
EN 10149-2 | S315MC | S355MC | S420MC | S460MC |
S500MC | S550MC | S600MC | S650MC |
S700MC | S900MC | S960MC |
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Q/BQB 310 | SAPH310 | SAPH370 | SAPH400 | SAPH440 |
SPFH540 | SPFH590 | SPFH780 | QStE340TM |
QStE380TM | QStE420TM | QStE460TM | QStE500TM |
QStE550TM | QStE600TM | QStE650TM | QStE700TM |
B440QZR | B480QZR |
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SEW092 | QStE260N | QStE340TM | QStE340N | QStE380TM |
QStE380N | QStE420TM | QStE420N | QStE460TM |
QStE460N | QStE500TM | QStE500N | QStE550TM |