Steel 11SMnPb37 CD-SM
Supply condition
EN 11SMnPb37
CD-SM = 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.
Values for the CD-SM condition
Other 11SMnPb37 tempers and conditions
11SMnPb37 is listed in 5 conditions; see the grade overview at 11SMnPb37.
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-SMThis page 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 |
What is 11SMnPb37 CD-SM?
11SMnPb37 CD-SM is 11SMnPb37 supplied in the CD-SM condition — same +C condition but thin bar: higher cold-work ratio gives the top of the strength band, used for small screw-machine parts. 11SMnPb37 CD-SM has a yield strength of 480 MPa (69.6 ksi) and a tensile strength of 610 MPa (88.5 ksi) — stronger than 59% of steel grades. Elongation at break is 8% and the elastic modulus is 205 GPa (29.7 Msi). 11SMnPb37 CD-SM 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). CD is the default condition FabDigit quotes; CD-SM is available on request or by drawing note.
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 — 8%, worse than 95% of steel grades
- Limited formability — 20/100, worse than 80% of steel grades
- Limited service temperature — 300°C (572 °F), worse than 78% of steel grades
11SMnPb37 CD-SM properties
Typical room-temperature values for 11SMnPb37 CD-SM; 22 are specific to this condition. Other listed values are 11SMnPb37 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
11SMnPb37 CD-SM 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 CD-SM has a yield strength of 480 MPa (69.6 ksi) and a tensile strength of 610 MPa (88.5 ksi) — stronger than 59% of steel grades. Elongation at break is 8% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
11SMnPb37 CD-SM 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 CD-SM 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-SM 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-SM's machinability is excellent (95/100, better than 100% of steel grades); weldability not recommended (8/100); formability poor (20/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 11SMnPb37 CD-SM
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-SM — frequently asked
What is 11SMnPb37 CD-SM used for?
11SMnPb37 CD-SM 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-SM?
11SMnPb37 CD-SM has a typical yield strength of 480 MPa (69.6 ksi) and a tensile strength of 610 MPa (88.5 ksi) — stronger than 59% of steel grades. Strength varies by condition: see the 5 listed tempers.
Is 11SMnPb37 CD-SM 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-SM 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-SM?
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-SM 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-SM?
11SMnPb37 CD-SM 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-SM?
Yes — 11SMnPb37 CD-SM 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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.