Q-BQB 310-2009 SAPH310 automobile structure steel Introduction
Q-BQB 310-2009 SAPH310 is a standard for hot-rolled carbon and low-alloy high-strength steel plates used in automobile structures. It is developed by the China Automotive Industry Association (CAA) and applies to flat products such as plates, strips, and wide flats, as well as sections and bars of weldable fine-grain structural steel.
Q-BQB 310-2009 SAPH310 automobile structure steel chemical composition
| Grade |
C |
Si |
Mn |
P |
S |
Alt |
| SAPH310 |
≤0.10 |
≤0.30 |
≤0.50 |
≤0.035 |
≤0.035 |
≥0.010 |
Q-BQB 310-2009 SAPH310 automobile structure steel characteristics
| Grade |
SAPH310 |
| Tensile strength |
MPa |
|
≥310 |
| Up yield strength |
MPa |
Nominal thickness
(mm) |
＜6.0 |
≥185 |
| 6.0~＜8.0 |
| ≥8.0 |
≥175 |
| Elongation % |
L0=50mm, b=25mm |
1.6~＜2.0 |
≥33 |
| 2.0~＜2.5 |
≥34 |
| 2.5~＜3.15 |
≥36 |
| 3.15~＜4.0 |
≥38 |
| 4.0~＜6.3 |
≥40 |
| ≥6.3 |
≥41 |
| 180° Bending test |
Apex diameter |
＜2.0 |
0a |
| ≥2.0 |
2a |
Q-BQB 310-2009 SAPH310 automobile structure steel applications
- Automotive load-bearing structural members, such as body frames, chassis, pillars, etc.
- Truck and trailer structures
- Building structures
- Machinery equipment
- Other structural applications requiring high strength and good weldability
Advantages over other steel grades
- High strength: The 310 MPa yield strength enables it to withstand larger loads, improving vehicle safety.
- Good weldability: Good weldability makes it suitable for various welding processes used in automotive manufacturing.
- Economical: Q-BQB 310-2009 SAPH310 is relatively low-cost compared to other high-strength steels.
Things to note
- Q-BQB 310-2009 SAPH310 is a hot-rolled steel, which means it is more difficult to form than cold-rolled steel but may have better corrosion resistance.
- Heat treatment is required to achieve full strength and toughness.
- Appropriate welding processes and welding materials need to be used when welding to ensure the strength and quality of the joint.
Q-BQB 310-2009 SAPH310 is a high-performance automobile structure steel with advantages such as high strength, good weldability, and economical cost. It is an important material in the automotive industry.
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