65Mn
Data verified65Mn is China’s manganese spring steel (GB/T 1222): a high carbon steel whose 0.90–1.20% manganese buys real through-hardening at plain-steel prices. It is ubiquitous in Chinese spring, blade and wear-part production.
Chemical composition
| Element | Content (%) |
|---|---|
| C | 0.62–0.70 |
| Si | 0.17–0.37 |
| Mn | 0.90–1.20 |
| P | ≤0.035 |
| S | ≤0.035 |
| Cr | ≤0.25 |
Weight percent, per the governing standard ranges. Actual values per heat are on the mill certificate.
Properties
| Tensile strength | 1000–1250 MPa (Q&T, typ.) |
| Yield strength | ≥785 MPa (Q&T reference, typ.) |
| Density | 7.85 g/cm³ |
Heat treatment
Quench 830 °C oil; temper 480 °C (GB/T 1222 reference cycle); anneal 780–810 °C for machining.
Equivalent grades
| Standard | Designation |
|---|---|
| aisi | 1065/1566 (near) |
| gb | 65Mn (GB/T 1222) |
Compare side by side: 65Mn vs 1065 · 65Mn vs 1566
Equivalents overlap in chemistry and use but are not always identical — see our equivalents guide before substituting in certified designs.
Applications & Processing
Applications: Leaf and coil springs, spring washers, blades, discs, wear parts, agricultural tools.
Processing: Machines annealed; quench cracking risk rises in thick sections — oil quench and prompt tempering are essential.
FAQ
- 65Mn vs 60Si2Mn?
- 65Mn hardens with manganese alone and is cheaper; 60Si2Mn adds ~1.75% silicon for a higher elastic limit and better sag resistance, so it wins in high-deflection springs.
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Ask for a quotationVisit NasteelSource: GB/T 1222 published ranges · Last updated 2026-11-03. Data is indicative — verify critical values against the governing standard and mill certificate before use.