Steel 11SMn37
EN 11SMn37
11SMn37 (1.0736) is a European high-sulphur, high-manganese free-cutting (resulphurised) structural steel, the unleaded counterpart of 11SMnPb37 and the closest EN equivalent to AISI 1215.
Values for the HR condition
11SMn37 tempers and conditions
11SMn37 is supplied in 5 conditions, soft to hard. HR is the default FabDigit quotes; the values on this page are for it.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
soft annealed / normalised bar | Softest condition, used when heavy cold heading, staking or deep upsetting follows machining. | 250 | 400 | 26 | 118 HB | — |
HRDefault Hot rolled | Cheapest form, black scaled surface and loose tolerance — pick when the part will be fully machined from oversize stock. | 280 | 420 | 22 | 125 HB | — |
Cold rolled | Cold-rolled flats, hexagons and shaped sections where a bright, dimensionally accurate profile is needed. | 410 | 550 | 10 | 165 HB | 10.5 % IACS |
Cold drawn | Standard stock condition for automatic-lathe work: best surface, tight tolerance (h9/h11) and highest strength. | 420 | 560 | 9 | 170 HB | — |
cold drawn, stress-relieved (high yield, straightened) | Choose when parts are machined off-centre or slender and must stay straight after stock removal. | 480 | 600 | 8 | 180 HB | 10.5 % IACS |
Supply forms, finishes and certifications
Ways 11SMn37 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
PL-SL | +PL/+SL | Surface finish |
What is 11SMn37?
11SMn37 (1.0736) is a European high-sulphur, high-manganese free-cutting (resulphurised) structural steel, the unleaded counterpart of 11SMnPb37 and the closest EN equivalent to AISI 1215. Its ~0.35 % S content forms MnS inclusions that break chips and lubricate the tool, giving outstanding productivity on automatic lathes and screw machines for high-volume, low-stress turned parts (bushings, fittings, shafts, fasteners). Limits: it is not intended for welding, heat treatment (very low C) or corrosive service, transverse ductility and impact toughness are poor, and surface protection (zinc plating, blackening) is normally required. 11SMn37 has a density of 7.87 g/cm³ (0.284 lb/in³), heavier than 92% of steel grades. It melts at 1,420°C (2,588 °F). 11SMn37 has a yield strength of 280 MPa (40.6 ksi) and a tensile strength of 420 MPa (60.9 ksi) — weaker than 90% of steel grades. Elongation at break is 22% and the elastic modulus is 205 GPa (29.7 Msi).
What is 11SMn37 used for?
- Screw machine turned parts
- Fasteners and threaded inserts
- Hydraulic and pneumatic fittings
- Bushings and spacers
- Small shafts and pins
- Instrument and connector bodies
- Nozzles and adapters
Advantages
- Easy to machine — 88/100, better than 99% of steel grades
- Conducts heat well — 51 W/m·K (29.5 BTU/hr·ft·°F), better than 92% of steel grades
- High electrical conductivity — 10.5 % IACS, better than 89% of steel grades
Limitations
- Hard to polish — 40/100, worse than 96% of steel grades
- Difficult to weld — 15/100, worse than 91% of steel grades
- Low strength — 280 MPa (40.6 ksi), worse than 90% of steel grades
11SMn37 properties
Typical room-temperature values for 11SMn37-HR; bars are the position among steel grades.
Physical3
11SMn37 has a density of 7.87 g/cm³ (0.284 lb/in³), heavier than 92% of steel grades. It melts at 1,420°C (2,588 °F).
Mechanical14
11SMn37 has a yield strength of 280 MPa (40.6 ksi) and a tensile strength of 420 MPa (60.9 ksi) — weaker than 90% of steel grades. Elongation at break is 22% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
11SMn37 is rated for continuous service to 350°C (662 °F). It conducts heat at 51 W/m·K (29.5 BTU/hr·ft·°F), better than 92% of steel grades. Thermal expansion is 11.7 µm/m·K (6.5 µin/in·°F).
Electrical3
11SMn37 conducts electricity at 10.5 % IACS, better than 89% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (8/100), worse than 99% of steel grades.
Sustainability4
Producing a kilogram of 11SMn37 takes about 25 MJ of energy and emits 2 kg of CO₂ — less than 82% of steel grades. Typical recycled content is 35%.
Manufacturability7
11SMn37's machinability is excellent (88/100, better than 99% of steel grades); weldability poor (15/100); formability fair (40/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the steel family
Yield strength against density for every steel grade FabDigit runs. 11SMn37 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 11SMn37
Is 11SMn37 easy to machine?
Benchmark free-cutting steel: run high speeds with sharp positive-rake carbide or HSS, light feeds give short chips; expect ~30–40 % higher metal-removal rates than 1.0402/C22.
Can 11SMn37 be welded?
Not recommended — 0.32–0.42 % S causes hot cracking and porosity; if unavoidable use low-hydrogen consumables, preheat and accept reduced joint properties.
Can 11SMn37 be formed, bent or molded?
Only light cold forming (knurling, staking, small upsets); transverse bending and heavy heading crack along the MnS stringers — use annealed stock and generous radii.
Manufacturability
The process limits FabDigit applies to 11SMn37. Every 11SMn37 part is priced by an engineer; design inside these and the quote comes back without a redesign loop.
CNC machining
| Machinability | Excellent88 / 100 |
|---|---|
| ISO material group | P.1 |
| Cutting speed (rough / finish) | 220 / 260 m/min |
| Minimum wall | 0.8 mm |
| Minimum internal radius | 1 mm |
| Drill depth limit | 5× diameter |
| Best surface (machined / polished) | Ra 1.6 / — |
| Hardenable after machining | No |
11SMn37 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| CEN 10087 max | ≤ 0.14 | 0.09 |
| Sikept low to preserve machinability | ≤ 0.05 | 0.03 |
| Mnforms MnS chip breakers | 1 – 1.5 | 1.25 |
| Pintentionally high | ≤ 0.11 | 0.07 |
| Sfree-cutting addition | 0.32 – 0.42 | 0.37 |
| Fe | balance |
What surface finishes work on 11SMn37?
Zinc or Zn-Ni plating, black oxide, phosphate or nickel are standard; polishing shows inclusion pull-out, and case hardening is possible (carbonitriding) but gives shallow, uneven cases.
Surface treatments FabDigit runs on steel parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Plating
CVD Coating
Black / Phosphate
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Steel 11SMn37 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- 1.0736
How much does 11SMn37 cost?
11SMn37 is a budget-cost steel ($), cheaper than about 90% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
11SMn37 — frequently asked
What is 11SMn37 used for?
11SMn37 is typically used for screw machine turned parts, fasteners and threaded inserts, hydraulic and pneumatic fittings, bushings and spacers, small shafts and pins and instrument and connector bodies. In short: free-machining sulfurized bar.
What is the yield strength of 11SMn37?
11SMn37 has a typical yield strength of 280 MPa (40.6 ksi) and a tensile strength of 420 MPa (60.9 ksi) — weaker than 90% of steel grades. Strength varies by condition: see the 5 listed tempers.
Is 11SMn37 easy to machine?
Yes — machinability is rated excellent (88/100, better than 99% of steel grades). Benchmark free-cutting steel: run high speeds with sharp positive-rake carbide or HSS, light feeds give short chips; expect ~30–40 % higher metal-removal rates than 1.0402/C22.
Can 11SMn37 be welded?
Not readily — weldability is rated poor (15/100). Not recommended — 0.32–0.42 % S causes hot cracking and porosity; if unavoidable use low-hydrogen consumables, preheat and accept reduced joint properties.
What surface finishes work on 11SMn37?
Zinc or Zn-Ni plating, black oxide, phosphate or nickel are standard; polishing shows inclusion pull-out, and case hardening is possible (carbonitriding) but gives shallow, uneven cases.
Can 11SMn37 be formed, bent or molded?
Only light cold forming (knurling, staking, small upsets); transverse bending and heavy heading crack along the MnS stringers — use annealed stock and generous radii.
What is the maximum service temperature of 11SMn37?
11SMn37 is rated for continuous use to about 350°C (662 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 11SMn37-HR and 11SMn37-SH?
HR is the default condition — cheapest form, black scaled surface and loose tolerance — pick when the part will be fully machined from oversize stock. SH: choose when parts are machined off-centre or slender and must stay straight after stock removal. Yield strength is 280 MPa in HR versus 480 MPa in SH.
How much does 11SMn37 cost?
11SMn37 is a budget-cost steel ($), cheaper than about 90% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Can FabDigit make parts in 11SMn37?
Yes — 11SMn37 is available for CNC machining; every part is priced by an engineer rather than instantly. Upload a STEP file to get a price and a DFM check.
Sources
- EN 10087 — Free-cutting steels, technical delivery conditions — CEN (1998)
- EN 10277-3 — Bright steel products, free-cutting steels — CEN (2008)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- Stahlschlüssel / Key to Steel — 1.0736 — Verlag Stahlschlüssel Wegst (2019)
- Free-cutting steel bright bar datasheets (11SMn37 / 11SMnPb37) — European bright bar producers (2022)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.