11SMnPb30 vs 11SMn30: Same base steel — Pb version has even better machinability
11SMnPb30 vs 11SMn30
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.
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.
| 11SMnPb30 | 11SMn30 | |
|---|---|---|
| Material Number | 1.0718 | 1.0715 |
| Category | Carbon Steel | Carbon Steel |
| Standard | EN 10087 | EN ISO 683-4 |
Chemical composition (wt%) — Pro
| Element | 11SMnPb30 | 11SMn30 | Overlap |
|---|---|---|---|
| C | 0–0.14% | 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 |
| S | |||
| Pb |
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Sign up free — 3 comparisons/day freeMechanical properties — Pro
| Property | 11SMnPb30 | 11SMn30 | Unit |
|---|---|---|---|
| Tensile Strength | 460–710 | 380–570 | MPa |
| Yield Strength | ≥ 375 | — | MPa |
| Elongation | ≥ 8 | — | % |
| Hardness HB | |||
| Elastic Modulus | |||
| Density |
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Sign up free — 3 comparisons/day freeCompatibility Assessment
11SMnPb30 adds 0.20-0.35% Pb for ~30% improved machinability and better surface finish. 11SMn30 is unleaded and increasingly preferred for environmental/RoHS reasons. Choose Pb version only when maximum machinability is critical and Pb is permitted.
Frequently Asked Questions
Is 11SMnPb30 the same as 11SMn30?
11SMnPb30 and 11SMn30 have a 85% composition overlap. Same base steel — Pb version has even better machinability
Can I replace 11SMnPb30 with 11SMn30?
In many cases, yes. The compositions overlap significantly (85%). However, always verify mechanical property requirements and heat treatment compatibility for your specific application.
What is the difference between 11SMnPb30 and 11SMn30?
The main differences are in the following elements: overall alloying content. 11SMnPb30 is a Carbon Steel grade, while 11SMn30 is a Carbon Steel grade.
Related Comparisons
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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.