1566
Data verified1566 is a high carbon, high manganese steel for springs and wear parts needing deeper hardening than 1065 provides. Its chemistry is close to the GB 65Mn concept under the SAE numbering system.
Chemical composition
| Element | Content (%) |
|---|---|
| C | 0.60–0.71 |
| Mn | 0.85–1.15 |
| P | ≤0.040 |
| S | ≤0.050 |
Weight percent, per the governing standard ranges. Actual values per heat are on the mill certificate.
Properties
| Tensile strength | 750–900 MPa (normalized, typ.) |
| Density | 7.85 g/cm³ |
Heat treatment
Anneal 800 °C; quench 820–850 °C oil; temper 380–500 °C.
Equivalent grades
| Standard | Designation |
|---|---|
| aisi | 1566 |
| gb | 65Mn (near) |
Compare side by side: 1566 vs 65Mn · 1566 vs 1065
Equivalents overlap in chemistry and use but are not always identical — see our equivalents guide before substituting in certified designs.
Applications & Processing
Applications: Springs, blades, wear parts, high-carbon wire and strip.
Processing: Machine annealed; limited weldability; through-hardens in moderate sections.
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Ask for a quotationVisit NasteelSource: SAE J403 published ranges · Last updated 2026-11-03. Data is indicative — verify critical values against the governing standard and mill certificate before use.