Steel 11SMnPb37
EN 11SMnPb37
11SMnPb37 (material number 1.0737) is a high-sulphur, high-phosphorus leaded free-cutting structural steel to EN 10087, in which manganese sulphide inclusions and dispersed lead particles break chips and extend tool life.
Values for the CD condition
11SMnPb37 tempers and conditions
11SMnPb37 is supplied in 5 conditions, soft to hard. CD 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 |
|---|---|---|---|---|---|---|
Solution annealed | Rarely stocked; used when maximum ductility for a subsequent forming or straightening step is required (machinability drops slightly). | 230 | 390 | 25 | 115 HB | 10.5 % IACS |
Hot rolled | Cheapest input form for parts that will be fully machined all over or forged before finishing. | 250 | 420 | 20 | 125 HB | 10.5 % IACS |
CDDefault Cold drawn | Standard stock condition: bright cold-drawn bar (h9/h11), best surface and highest strength for automatic-lathe production. | 415 | 540 | 10 | 163 HB | — |
CD+G | Pick when tight diameter tolerance and Ra ≤ 0.4 µm are needed straight from bar without turning the OD. | 415 | 540 | 10 | 163 HB | 10.5 % IACS |
CD small diameter | Same +C condition but thin bar: higher cold-work ratio gives the top of the strength band, used for small screw-machine parts. | 480 | 610 | 8 | 11 HRC | 10.5 % IACS |
Supply forms, finishes and certifications
Ways 11SMnPb37 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 | +SH | Surface finish |
What is 11SMnPb37?
11SMnPb37 (material number 1.0737) is a high-sulphur, high-phosphorus leaded free-cutting structural steel to EN 10087, in which manganese sulphide inclusions and dispersed lead particles break chips and extend tool life. Supplied cold drawn at about 415 MPa yield, 540 MPa tensile and 163 HB, it is the default bar for high-volume screw-machine and sliding-headstock work: screws, fittings, bushings and small pneumatic or hydraulic parts. Ductility and impact toughness are low, it is effectively unweldable, corrosion resistance is below plain carbon steel, and the lead content brings RoHS/REACH and occupational-hygiene constraints; 11SMn30 or bismuth grades are the lead-free alternatives. 11SMnPb37 has a density of 7.86 g/cm³ (0.284 lb/in³), heavier than 90% of steel grades. It melts at 1,420°C (2,588 °F). 11SMnPb37 has a yield strength of 415 MPa (60.2 ksi) and a tensile strength of 540 MPa (78.3 ksi) — weaker than 56% of steel grades. Elongation at break is 10% and the elastic modulus is 205 GPa (29.7 Msi).
What is 11SMnPb37 used for?
- Screw-machine turned parts
- Hydraulic and pneumatic fittings
- Threaded screws and studs
- Bushings and spacers
- Small shafts and pivot pins
- Connector and sensor bodies
- Valve and instrument bodies
Advantages
- Easy to machine — 95/100, better than 100% of steel grades
- High electrical conductivity — 10.5 % IACS, better than 89% of steel grades
- Conducts heat well — 50 W/m·K (28.9 BTU/hr·ft·°F), better than 87% of steel grades
Limitations
- Difficult to weld — 8/100, worse than 99% of steel grades
- Hard to polish — 40/100, worse than 96% of steel grades
- Limited ductility — 10%, worse than 91% of steel grades
- Limited service temperature — 300°C (572 °F), worse than 78% of steel grades
11SMnPb37 properties
Typical room-temperature values for 11SMnPb37-CD; bars are the position among steel grades.
Physical3
11SMnPb37 has a density of 7.86 g/cm³ (0.284 lb/in³), heavier than 90% of steel grades. It melts at 1,420°C (2,588 °F).
Mechanical14
11SMnPb37 has a yield strength of 415 MPa (60.2 ksi) and a tensile strength of 540 MPa (78.3 ksi) — weaker than 56% of steel grades. Elongation at break is 10% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
11SMnPb37 is rated for continuous service to 300°C (572 °F). It conducts heat at 50 W/m·K (28.9 BTU/hr·ft·°F), better than 87% of steel grades. Thermal expansion is 11.7 µm/m·K (6.5 µin/in·°F).
Electrical3
11SMnPb37 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 11SMnPb37 takes about 25 MJ of energy and emits 2 kg of CO₂ — less than 82% of steel grades. Typical recycled content is 35%.
Manufacturability6
11SMnPb37's machinability is excellent (95/100, better than 100% of steel grades); weldability not recommended (8/100); formability poor (25/100).
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. 11SMnPb37 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 11SMnPb37
Is 11SMnPb37 easy to machine?
Benchmark free-cutting steel: 160 % of AISI 1212, runs at high speed on cam and CNC screw machines with excellent chip break and surface finish; use good coolant and avoid grinding/burning Pb-bearing swarf.
Can 11SMnPb37 be welded?
Not weldable in practice — high S, P and Pb cause hot cracking and porosity; use mechanical joining or specify 11SMn30/low-S grades if welding is required.
Can 11SMnPb37 be formed, bent or molded?
Poor cold formability: fine for light knurling, thread rolling and roll-marking, but not for cold heading or tight-radius bending; hot working must stay below ~1180 °C and Pb makes hot forming risky.
Manufacturability
The process limits FabDigit applies to 11SMnPb37. Every 11SMnPb37 part is priced by an engineer; design inside these and the quote comes back without a redesign loop.
CNC machining
| Machinability | Excellent95 / 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 |
11SMnPb37 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 | ≤ 0.14 | 0.1 |
| Silow Si to keep steel free-cutting | ≤ 0.05 | 0.03 |
| Mnforms MnS chip breakers | 1 – 1.5 | 1.25 |
| Pintentionally high for brittle chips | ≤ 0.11 | 0.07 |
| S | 0.34 – 0.4 | 0.37 |
| Pbdispersed lead; RoHS/ELV exemption relevant | 0.15 – 0.35 | 0.25 |
| Fe | balance |
What surface finishes work on 11SMnPb37?
Almost always plated or coated (zinc, zinc-nickel, black oxide, phosphate + oil, or nickel); polishing leaves micro-pits at MnS/Pb inclusions and no anodizing applies.
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 11SMnPb37 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- 1.0737
How much does 11SMnPb37 cost?
11SMnPb37 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.
11SMnPb37 — frequently asked
What is 11SMnPb37 used for?
11SMnPb37 is typically used for screw-machine turned parts, hydraulic and pneumatic fittings, threaded screws and studs, bushings and spacers, small shafts and pivot pins and connector and sensor bodies. In short: leaded free-machining bar.
What is the yield strength of 11SMnPb37?
11SMnPb37 has a typical yield strength of 415 MPa (60.2 ksi) and a tensile strength of 540 MPa (78.3 ksi) — weaker than 56% of steel grades. Strength varies by condition: see the 5 listed tempers.
Is 11SMnPb37 easy to machine?
Yes — machinability is rated excellent (95/100, better than 100% of steel grades). Benchmark free-cutting steel: 160 % of AISI 1212, runs at high speed on cam and CNC screw machines with excellent chip break and surface finish; use good coolant and avoid grinding/burning Pb-bearing swarf.
Can 11SMnPb37 be welded?
Not readily — weldability is rated not recommended (8/100). Not weldable in practice — high S, P and Pb cause hot cracking and porosity; use mechanical joining or specify 11SMn30/low-S grades if welding is required.
What surface finishes work on 11SMnPb37?
Almost always plated or coated (zinc, zinc-nickel, black oxide, phosphate + oil, or nickel); polishing leaves micro-pits at MnS/Pb inclusions and no anodizing applies.
Can 11SMnPb37 be formed, bent or molded?
Poor cold formability: fine for light knurling, thread rolling and roll-marking, but not for cold heading or tight-radius bending; hot working must stay below ~1180 °C and Pb makes hot forming risky.
What is the maximum service temperature of 11SMnPb37?
11SMnPb37 is rated for continuous use to about 300°C (572 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 11SMnPb37-CD and 11SMnPb37-A?
CD is the default condition — standard stock condition: bright cold-drawn bar (h9/h11), best surface and highest strength for automatic-lathe production. A: rarely stocked; used when maximum ductility for a subsequent forming or straightening step is required (machinability drops slightly). Yield strength is 415 MPa in CD versus 230 MPa in A.
How much does 11SMnPb37 cost?
11SMnPb37 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 11SMnPb37?
Yes — 11SMnPb37 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 — ASM International (1990)
- ASM Handbook Vol.16 — Machining (machinability ratings) — ASM International (1989)
- 1.0737 / 11SMnPb37 free-cutting steel datasheet — Deutsche Edelstahlwerke (2020)
- GB/T 8731 (Y15Pb comparable grade) — SAC (2008)
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.