9SMn28
1.0715Free-cutting steel with high sulfur for excellent machinability. Very similar to 11SMn30 — historical German designation that is still widely referenced. Lower C variant preferred for some screw machine products. Used for high-volume automatic lathe parts, screws, nuts, pins, and bushings. ≈ AISI 1215.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | AISI | USA | AISI 1215 (approx) | — | REF |
| 🇪🇺 | EN | Europe | 9SMn28 | 1.0715 | 100% |
Sources: ASTM A29, EN 10087
Chemical composition comparison (wt%)
Side-by-side: 9SMn28 (EN) (EN 10087) vs 9SMn28 (EN) (EN 10087)
| Element | 9SMn28 (EN) | 9SMn28 (EN) | Overlap |
|---|---|---|---|
| C | 0–0.13% | 0–0.13% | OK |
| Si | 0–0.05% | 0–0.05% | OK |
| Mn | 0.9–1.3% | 0.9–1.3% | OK |
| P | 0–0.11% | 0–0.11% | OK |
| S | 0.24–0.35% | 0.24–0.35% | OK |
Mechanical properties
Cold worked
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 440–680 | MPa |
| Yield Strength | ≥ 350 | MPa |
| Elongation | ≥ 8 | % |
| Elastic Modulus | ≥ 210 | GPa |
| Density | ≥ 7.85 | g/cm3 |
General
| Property | Value | Unit |
|---|---|---|
| Hardness HB | ≤ 169 | HB |
Related materials
S355JR
1.0045High-strength low-alloy structural steel with minimum yield strength of 355 MPa. Standard grade for bridges, buildings, cranes, and general structural applications. Impact tested at +20°C (JR).
S690QL
1.8928High-strength quenched and tempered fine-grain structural steel with minimum yield strength of 690 MPa. Used for heavily loaded structures like mobile cranes, mining equipment, bridges, and pressure vessels.
S275JR
1.0044Medium-strength structural steel with minimum yield strength of 275 MPa. Bridges the gap between S235JR and S355JR. Used for general structural applications, lattice towers, masts, and light crane components. Impact tested at +20°C (JR).
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