9SMnPb28 vs ASTM A572 Grade 50: 39% composition overlap. Significantly different materials serving different application areas.
9SMnPb28 vs ASTM A572 Grade 50
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.
ASTM A572 Grade 50
The most widely used structural steel grade in the United States. 345 MPa (50 ksi) yield strength HSLA steel. Has largely replaced A36 for structural applications due to higher strength-to-weight ratio. Used for building frames, bridges, heavy equipment, and general structural fabrication.
| 9SMnPb28 | ASTM A572 Grade 50 | |
|---|---|---|
| Material Number | 1.0718 | — |
| Category | Carbon Steel | Carbon Steel |
| Standard | EN 10087 | ASTM A572 |
Chemical composition (wt%)
| Element | 9SMnPb28 | ASTM A572 Grade 50 | Overlap |
|---|---|---|---|
| C | 0–0.14% | 0–0.23% | OK |
| Si | — | 0–0.4% | — |
| Mn | 0.9–1.3% | 0–1.35% | OK |
| P | 0–0.06% | 0–0.04% | OK |
Mechanical properties
| Property | 9SMnPb28 | ASTM A572 Grade 50 | Unit |
|---|---|---|---|
| tensile_strength | 370–500 | ≥ 450 | MPa |
| yield_strength | 230–300 | ≥ 345 | MPa |
| elongation | 14–22 | ≥ 18 | % |
Compatibility Assessment
9SMnPb28 and ASTM A572 Grade 50 have significantly different compositions (39% 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 ASTM A572 Grade 50?
9SMnPb28 and ASTM A572 Grade 50 have a 39% composition overlap. They are generally not directly interchangeable.
Can I replace 9SMnPb28 with ASTM A572 Grade 50?
Generally not recommended. The compositions differ significantly (39% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between 9SMnPb28 and ASTM A572 Grade 50?
The main differences are in the following elements: S. 9SMnPb28 is a Carbon Steel grade, while ASTM A572 Grade 50 is a Carbon Steel grade.
Related Comparisons
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.