27SiMn
Data verified27SiMn is a Chinese Si-Mn alloy steel specified for hydraulic cylinder tubes and coal-mine hydraulic props — high Q&T strength with good weldability for a 980 MPa class steel.
Chemical composition
| Element | Content (%) |
|---|---|
| C | 0.24–0.32 |
| Si | 1.10–1.40 |
| Mn | 1.10–1.40 |
| P | ≤0.035 |
| S | ≤0.035 |
Weight percent, per the governing standard ranges. Actual values per heat are on the mill certificate.
Properties
| Tensile strength | ≥980 MPa (Q&T reference) |
| Yield strength | ≥835 MPa (Q&T reference) |
| Density | 7.85 g/cm³ |
Heat treatment
Quench 920 °C water; temper 450 °C (GB/T 17396 reference cycle for hydraulic props).
Equivalent grades
| Standard | Designation |
|---|---|
| gb | 27SiMn (GB/T 17396) |
Equivalents overlap in chemistry and use but are not always identical — see our equivalents guide before substituting in certified designs.
Applications & Processing
Applications: Hydraulic cylinder barrels, mine props, high-pressure seamless tube, machinery parts.
Processing: Supplied as seamless tube, often honed/SRB finished for cylinders; weld with preheat.
FAQ
- Why silicon-manganese for cylinders?
- The Si-Mn combination gives high yield after Q&T at low alloy cost, and the steel stays weldable — ideal for welded hydraulic cylinder construction.
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Ask for a quotationVisit NasteelSource: GB/T 17396 published ranges · Last updated 2026-11-03. Data is indicative — verify critical values against the governing standard and mill certificate before use.