U71Mn
Data under reviewU71Mn is China’s standard carbon rail steel to GB/T 2585, the pearlitic C-Mn grade laid on most conventional-speed lines. Wear resistance comes from its high carbon and manganese; weldability is limited and rail joints are aluminothermic or flash-butt welded.
Chemical composition
| Element | Content (%) |
|---|---|
| C | 0.65–0.76 |
| Si | 0.15–0.35 |
| Mn | 1.10–1.40 |
| P | ≤0.030 |
| S | ≤0.030 |
Weight percent, per the governing standard ranges. Actual values per heat are on the mill certificate.
Properties
| Tensile strength | ≥880 MPa (as-rolled rail) |
| Hardness | ~260–300 HB (rail head, typ.) |
| Density | 7.85 g/cm³ |
Heat treatment
Supplied as-rolled (pearlitic); head-hardened variants are quenched from rolling heat for heavy-haul lines.
Equivalent grades
| Standard | Designation |
|---|---|
| din | R260 family (near, EN 13674) |
| gb | U71Mn (GB/T 2585) |
Equivalents overlap in chemistry and use but are not always identical — see our equivalents guide before substituting in certified designs.
Applications & Processing
Applications: Railway rails (43/50/60/75 kg/m profiles), turnouts, crane rails (with profile-specific standards).
Processing: Not a fabrication steel — rails are rolled to profile, straightened and drilled/fishplated or welded by qualified rail processes only.
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Ask for a quotationVisit NasteelSource: GB/T 2585 published ranges · Last updated 2026-11-03. Data is indicative — verify critical values against the governing standard and mill certificate before use.