Steel Grade Datasheet
11SMn30/ 1.0715 / 1213Free-Cutting (Free-Machining) Steel
What is 11SMn30 steel?
11SMn30 (Werkstoff No. 1.0715, equivalent to AISI 1213) is a free-cutting (free-machining) steel with high sulphur (0.27–0.33%) and manganese. Sulphur forms manganese-sulphide inclusions that break the chip, giving high cutting speed, long tool life and excellent surface finish. It is the standard material for small parts mass-produced on automatic lathes and CNC. It is selected for machinability, not mechanical strength.
Chemical Composition
Cast analysis, % by weight (per the applicable EN standard)
| Element | Range (%) |
|---|---|
| C | ≤ 0.14 |
| Si | ≤ 0.05 |
| Mn | 0.90–1.30 |
| P | ≤ 0.11 |
| S | 0.27–0.33 |
Mechanical Properties (+C (soğuk çekme). Bu çelik mekanik dayanımla değil, YÜKSEK İŞLENEBİLİRLİKLE seçilir; ısıl işlemle sertleştirilmez.)
Values depend on ruling section / thickness (d).
| Section (mm) | Yield Re min (MPa) | Tensile Rm (MPa) | Elongation A min (%) |
|---|---|---|---|
| +C · d ≤ 40 (soğuk çekme) | — | 480–680 | ≈ 7 |
Hardness: Cold drawn typically ~150–220 HB. Not hardened by heat treatment; the value is in machinability.
11SMn30 / 1.0715 properties and use
International Equivalents
Values marked ≈ are nearest matches, not exact equivalents. Always confirm against the governing standard.
| System | Grade |
|---|---|
| EN | 11SMn30 |
| W.-Nr. (DIN) | 1.0715 (Pb'li: 11SMnPb30 / 1.0718) |
| AISI/SAE | 1213 (Pb'li: 12L13) |
| ASTM | A29 / A108 |
| JIS | SUM22 (SUM22L) |
| GOST | ≈ А20 (A20) |
| BS (UK) | ≈ 220M07 |
| GB (China) | ≈ Y15 |
Applications
- Automatic-lathe and CNC mass-production parts
- Screws, nuts and fasteners
- Bushings, pins and fittings
- Hydraulic and pneumatic fitting parts
- Low-load shaft and gear blanks
- Standard turned parts
Available Product Forms
Frequently Asked Questions
What is free-cutting (free-machining) steel?+
A steel with deliberately raised sulphur (and sometimes lead) that machines very easily. Sulphur forms MnS inclusions that break the chip, giving high cutting speed, low tool wear and a clean surface. It is ideal for mass-producing parts on automatic lathes and CNC.
Can 11SMn30 be hardened?+
No. Its low carbon (≤0.14%) means it does not harden on quenching and is not used for high strength. If a hardenable surface is needed, choose a case-hardening steel (16MnCr5); if strength is needed, choose a Q&T steel (C45, 42CrMo4).
What is the difference between 11SMn30 and 11SMnPb30?+
11SMnPb30 (1.0718) is 11SMn30 with added lead (Pb). Lead further improves machinability (higher speed, better finish). For environmental/health reasons, lead-free 11SMn30 or bismuth alternatives are increasingly preferred.
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References & Standards
Values on this page are reference data compiled from the applicable EN standard; certified material properties are defined by the mill test certificate (EN 10204 3.1).