Steel 11SMnPb37 · supply condition · default condition
Steel 11SMnPb37-CD
Properties of the CD condition, compared with the other 11SMnPb37 tempers.
Standard stock condition: bright cold-drawn bar (h9/h11), best surface and highest strength for automatic-lathe production.
What is 11SMnPb37-CD?
11SMnPb37-CD is 11SMnPb37 supplied in the CD condition — standard stock condition: bright cold-drawn bar (h9/h11), best surface and highest strength for automatic-lathe production. 11SMnPb37-CD has a yield strength of 415 MPa (60.2 ksi) and a tensile strength of 540 MPa (78.3 ksi) — weaker than 55% of steel grades. Elongation at break is 10% and the elastic modulus is 205 GPa (29.7 Msi). 11SMnPb37-CD has a density of 7.86 g/cm³ (0.284 lb/in³), heavier than 89% of steel grades. It melts at 1,420°C (2,588 °F).
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 88% of steel grades
Limitations
- Difficult to weld — 8/100, worse than 100% 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 77% of steel grades
11SMnPb37-CD properties
Typical room-temperature values for 11SMnPb37-CD — 10 properties are specific to this condition; the rest are grade-level values shared by every 11SMnPb37 temper. Each bar shows where the value sits among the steel grades in FabDigit's library — further right is higher.
Physical3
11SMnPb37-CD has a density of 7.86 g/cm³ (0.284 lb/in³), heavier than 89% of steel grades. It melts at 1,420°C (2,588 °F).
Mechanical14
11SMnPb37-CD has a yield strength of 415 MPa (60.2 ksi) and a tensile strength of 540 MPa (78.3 ksi) — weaker than 55% of steel grades. Elongation at break is 10% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
11SMnPb37-CD 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 88% of steel grades. Thermal expansion is 11.7 µm/m·K (6.5 µin/in·°F).
Electrical3
11SMnPb37-CD 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-CD 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-CD'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.
Other 11SMnPb37 tempers and conditions
11SMnPb37 is also supplied in 5 other conditions. The full side-by-side table is on the 11SMnPb37 overview.
- CDDefaultStandard stock condition: bright cold-drawn bar (h9/h11), best surface and highest strength for automatic-lathe production.415 MPa yield · 163 HB
Working with 11SMnPb37-CD
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.
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.
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 | — |
11SMnPb37-CD — frequently asked
What is 11SMnPb37-CD used for?
11SMnPb37-CD 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-CD?
11SMnPb37-CD has a typical yield strength of 415 MPa (60.2 ksi) and a tensile strength of 540 MPa (78.3 ksi) — weaker than 55% of steel grades. Strength varies by condition: see the 6 listed tempers.
Is 11SMnPb37-CD 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-CD 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-CD?
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-CD 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-CD?
11SMnPb37-CD 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.
Can FabDigit make parts in 11SMnPb37-CD?
Yes — 11SMnPb37-CD is available for CNC machining with instant online pricing. 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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.