9SMnPb28 vs C55E: 10% composition overlap. Significantly different materials serving different application areas.
9SMnPb28 vs C55E
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.
C55E
1.1203
High-carbon unalloyed Q&T steel — 0.52-0.60% C. Modern designation for Ck55. Good strength after Q&T (UTS 800-950 MPa) and excellent surface hardness after induction hardening (HRC 56-60). Used for rail wheels, crankshafts, heavy-duty shafts, and wear parts.
| 9SMnPb28 | C55E | |
|---|---|---|
| Material Number | 1.0718 | 1.1203 |
| Category | Carbon Steel | Carbon Steel |
| Standard | EN 10087 | EN 10083-2 |
Chemical composition (wt%)
| Element | 9SMnPb28 | C55E | Overlap |
|---|---|---|---|
| C | 0–0.14% | 0.52–0.6% | No overlap |
| Si | — | 0–0.4% | — |
| Mn | 0.9–1.3% | 0.6–0.9% | Partial |
| P | 0–0.06% | 0–0.025% | OK |
Mechanical properties
| Property | 9SMnPb28 | C55E | Unit |
|---|---|---|---|
| tensile_strength | 370–500 | 800–950 | MPa |
| yield_strength | 230–300 | 500–600 | MPa |
| elongation | 14–22 | 12–16 | % |
Compatibility Assessment
9SMnPb28 and C55E have significantly different compositions (10% 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 C55E?
9SMnPb28 and C55E have a 10% composition overlap. They are generally not directly interchangeable.
Can I replace 9SMnPb28 with C55E?
Generally not recommended. The compositions differ significantly (10% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between 9SMnPb28 and C55E?
The main differences are in the following elements: C, Mn, S. 9SMnPb28 is a Carbon Steel grade, while C55E is a Carbon Steel grade.
View full data for each material:
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.