1070
Data verified1070 is a high carbon steel for springs and cutting/wear applications needing more hardness than 1060/1065 deliver. It is supplied as bar, strip and wire for spring making.
Chemical composition
| Element | Content (%) |
|---|---|
| C | 0.65–0.75 |
| Mn | 0.60–0.90 |
| 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 | 730–880 MPa (normalized, typ.) |
| Density | 7.85 g/cm³ |
Heat treatment
Anneal 800–830 °C; quench 810–840 °C oil; temper 350–480 °C.
Equivalent grades
| Standard | Designation |
|---|---|
| din | C70 type (near) |
| aisi | 1070 |
| gb | 70 |
Compare side by side: 1070 vs 1075 · 1070 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, valve spring wire (non-premium), blades, discs, wear plates (thin).
Processing: Difficult to machine unless annealed; forming should be done soft, then hardened and tempered.
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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.