9SMnPb28 vs S275JR: 38% composition overlap. Significantly different materials serving different application areas.
9SMnPb28 vs S275JR
Side-by-side chemical composition and mechanical property comparison.
Overview
9SMnPb28
1.0718
Leaded free-cutting steel — Pb (0.15-0.35%) + S (0.24-0.33%) for maximum machinability. THE ultimate Automatenstahl: machinability rating ~175% (vs 100% for 11SMn30). Pb acts as chip-breaker and tool lubricant. Used for high-speed automatic screw machine production of screws, nuts, fittings, bushings, and any part where surface finish and cycle time matter most. NOTE: Pb content being phased out under EU ELV/RoHS — replacement grades emerging.
S275JR
1.0044
Medium-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).
| 9SMnPb28 | S275JR | |
|---|---|---|
| Material Number | 1.0718 | 1.0044 |
| Category | Carbon Steel | Carbon Steel |
| Standard | EN 10087 | EN 10025-2 |
Chemical composition (wt%)
| Element | 9SMnPb28 | S275JR | Overlap |
|---|---|---|---|
| C | 0–0.14% | 0–0.21% | OK |
| Si | — | 0–0.6% | — |
| Mn | 0.9–1.3% | 0–1.5% | OK |
| P | 0–0.06% | 0–0.035% | OK |
Mechanical properties
| Property | 9SMnPb28 | S275JR | Unit |
|---|---|---|---|
| tensile_strength | 370–500 | 410–560 | MPa |
| yield_strength | 230–300 | ≥ 275 | MPa |
| elongation | 14–22 | ≥ 23 | % |
Compatibility Assessment
9SMnPb28 and S275JR have significantly different compositions (38% overlap). These materials are not interchangeable and serve different application areas.
Automated assessment based on composition analysis
Frequently Asked Questions
Is 9SMnPb28 the same as S275JR?
9SMnPb28 and S275JR have a 38% composition overlap. They are generally not directly interchangeable.
Can I replace 9SMnPb28 with S275JR?
Generally not recommended. The compositions differ significantly (38% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between 9SMnPb28 and S275JR?
The main differences are in the following elements: S. 9SMnPb28 is a Carbon Steel grade, while S275JR 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.