11SMnPb30 vs C55E: 7% composition overlap. Significantly different materials serving different application areas.
11SMnPb30 vs C55E
Side-by-side chemical composition and mechanical property comparison.
Overview
11SMnPb30
1.0718
Leaded free-cutting steel — the highest machinability rating among carbon steels. Pb+S combination gives excellent chip breaking and surface finish. The standard grade for high-volume automatic lathe parts. Used for screws, nuts, bolts, bushings, pins, and automotive turned parts. ≈ AISI 12L14.
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.
| 11SMnPb30 | C55E | |
|---|---|---|
| Material Number | 1.0718 | 1.1203 |
| Category | Carbon Steel | Carbon Steel |
| Standard | EN 10087 | EN 10083-2 |
Chemical composition (wt%)
| Element | 11SMnPb30 | C55E | Overlap |
|---|---|---|---|
| C | 0–0.14% | 0.52–0.6% | No overlap |
| Si | 0–0.05% | 0–0.4% | OK |
| Mn | 0.9–1.3% | 0.6–0.9% | Partial |
| P | 0–0.11% | 0–0.025% | OK |
Mechanical properties
| Property | 11SMnPb30 | C55E | Unit |
|---|---|---|---|
| tensile_strength | 460–710 | 800–950 | MPa |
| yield_strength | ≥ 375 | 500–600 | MPa |
| elongation | ≥ 8 | 12–16 | % |
Compatibility Assessment
11SMnPb30 and C55E have significantly different compositions (7% overlap). These materials are not interchangeable and serve different application areas.
Automated assessment based on composition analysis
Frequently Asked Questions
Is 11SMnPb30 the same as C55E?
11SMnPb30 and C55E have a 7% composition overlap. They are generally not directly interchangeable.
Can I replace 11SMnPb30 with C55E?
Generally not recommended. The compositions differ significantly (7% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between 11SMnPb30 and C55E?
The main differences are in the following elements: C, Mn, S. 11SMnPb30 is a Carbon Steel grade, while C55E 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.