9SMnPb28
1.0718Leaded 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.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | AISI | USA | AISI 12L14 | — | REF |
| 🇪🇺 | EN | Europe | 9SMnPb28 / 1.0718 | 1.0718 | 100% |
Sources: ASTM A29, EN 10087
Chemical composition comparison (wt%)
Side-by-side: 9SMnPb28 (EN 10087) vs 9SMnPb28 / 1.0718 (EN) (EN 10087)
| Element | 9SMnPb28 (EN 10087) | 9SMnPb28 / 1.0718 (EN) | Overlap |
|---|---|---|---|
| C | — | 0–0.14% | — |
| Mn | — | 0.9–1.3% | — |
Mechanical properties
Compatibility verdict
9SMnPb28 and 9SMnPb28 / 1.0718: 100% composition match
Related materials
C45
1.0503Medium carbon unalloyed quality steel. Good machinability and moderate strength after heat treatment. Widely used for shafts, spindles, pins, studs, and general machine parts.
S355JR
1.0045High-strength low-alloy structural steel with minimum yield strength of 355 MPa. Standard grade for bridges, buildings, cranes, and general structural applications. Impact tested at +20°C (JR).
S235JR
1.0038General-purpose structural steel with minimum yield strength of 235 MPa. The most common structural steel grade in Europe for general construction, frames, and non-critical structural applications.
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