27SiMn is a high-strength low-alloy structural steel specified in GB/T 3077-2015, with optimized Si-Mn composition for enhanced mechanical properties. While the standard’s creators primarily set requirements for material (chemical composition, mechanical performance), they do not define product forms. Manufacturers can process the material into bars, forgings, or seamless tubes per applicable manufacturing standards. 27SiMn is suitable for heavy-duty structural components requiring superior strength and wear resistance.
- Seamless Pipe, Structural tube
GB/T 8162-2018 27SiMn Alloy Structural Steel Tube
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Chemical Component
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Product Name:
GB/T 8162-2018 27SiMn Alloy Structural Steel Tube
Standard:
GB/T8162-2018; GB/T3077-2015;GB/T17395-2022
Grade:
27SiMn
Thickness:
3-75mm
Section Shape:
Round
Outer Diameter:
32-630mm
Place of Origin:
Baotou, China(Mainland)
Usage:
Structural applications
Surface Treatment:
Hot Rolled
Tolerance:
OD: 32-50mm ±0.5mm; 50-630mm ±1.0%D WT: ≤3mm ±12.5%S; >3mm ±10%S
End:
Plain, beveled, or customized
End Protector:
Plastic pipe caps,iron protector or customized
length:
3-12m or customized
Brand:
Baotou steel
Delivery Time:
Normally within 30-45 days and according to the quantity.
Chemical Component（GB/T 8162）
| Grade | Type | C | Mn | Mo | Cr | Ni | Cu | P | S | Si | ||||
| Min | Max | Min | Max | Min | Max | Min | Max | Max | Max | Max | Max | Max | ||
| 27SiMn | – | – | 0.32 | – | 1.40 | – | – | – | – | – | – | – | – | 1.40 |
Mechanical Performance（GB/T 8162）
| Grade | Type | Total under load Elongation % | Yield Strength | Tensile Strength | Hardness | Specified OD
mm | Allowable hardness Variation | ||
| Min | Max | Min | HRC | HBW | HRC | ||||
| 27SiMn | – | 12 | 835 | – | 980 | – | – | – | – |
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