9SMn28 vs 11SMn30: Essentially the same free-cutting steel — historical designation variants
9SMn28 vs 11SMn30
Side-by-side chemical composition and mechanical property comparison.
Overview
9SMn28
1.0715
Free-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.
11SMn30
1.0715
Sulfur-manganese free-cutting steel, not intended for heat treatment. Excellent machinability (significantly better than standard carbon steels). Used for high-volume CNC-machined parts: bolts, nuts, pipe joints, bushings, fittings, and other turned components.
| 9SMn28 | 11SMn30 | |
|---|---|---|
| Material Number | 1.0715 | 1.0715 |
| Category | Carbon Steel | Carbon Steel |
| Standard | EN 10087 | EN ISO 683-4 |
Chemical composition (wt%)
| Element | 9SMn28 | 11SMn30 | Overlap |
|---|---|---|---|
| C | 0–0.13% | 0–0.14% | 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 |
Mechanical properties
| Property | 9SMn28 | 11SMn30 | Unit |
|---|---|---|---|
| tensile_strength | 440–680 | 380–570 | MPa |
| yield_strength | ≥ 350 | — | MPa |
| elongation | ≥ 8 | — | % |
Compatibility Assessment
Both are free-cutting steels with ~0.30% S and ~1.0-1.3% Mn for excellent machinability. Minor compositional differences (9SMn28 is the older DIN name). Both share W-Nr 1.0715. Practically interchangeable for automatic lathe parts.
Frequently Asked Questions
Is 9SMn28 the same as 11SMn30?
9SMn28 and 11SMn30 have a 95% composition overlap. Essentially the same free-cutting steel — historical designation variants
Can I replace 9SMn28 with 11SMn30?
In many cases, yes. The compositions overlap significantly (95%). However, always verify mechanical property requirements and heat treatment compatibility for your specific application.
What is the difference between 9SMn28 and 11SMn30?
The main differences are in the following elements: overall alloying content. 9SMn28 is a Carbon Steel grade, while 11SMn30 is a Carbon Steel grade.
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Data provided for reference only. Always verify against the applicable specification for critical applications.
All data is for reference only. Equivalents indicate similarity, not identity. Always verify against the applicable specification for safety-critical applications. materialref.com accepts no liability for decisions based on this data.