Steel 11SMnPb30 · supply condition · default condition
Steel 11SMnPb30-HR
Properties of the HR condition, compared with the other 11SMnPb30 tempers.
Cheapest bar form for large diameters or when parts are fully machined from oversize stock.
What is 11SMnPb30-HR?
11SMnPb30-HR is 11SMnPb30 supplied in the HR condition — cheapest bar form for large diameters or when parts are fully machined from oversize stock. 11SMnPb30-HR has a yield strength of 260 MPa (37.7 ksi) and a tensile strength of 480 MPa (69.6 ksi) — weaker than 92% of steel grades. Elongation at break is 22% and the elastic modulus is 210 GPa (30.5 Msi). 11SMnPb30-HR has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,420°C (2,588 °F).
Advantages
- Easy to machine — 88/100, better than 99% of steel grades
- Conducts heat well — 48 W/m·K (27.7 BTU/hr·ft·°F), better than 79% of steel grades
Limitations
- Difficult to weld — 12/100, worse than 96% of steel grades
- Low strength — 260 MPa (37.7 ksi), worse than 92% of steel grades
- Limited service temperature — 250°C (482 °F), worse than 85% of steel grades
11SMnPb30-HR properties
Typical room-temperature values for 11SMnPb30-HR — 12 properties are specific to this condition; the rest are grade-level values shared by every 11SMnPb30 temper. Each bar shows where the value sits among the steel grades in FabDigit's library — further right is higher.
Physical3
11SMnPb30-HR has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,420°C (2,588 °F).
Mechanical14
11SMnPb30-HR has a yield strength of 260 MPa (37.7 ksi) and a tensile strength of 480 MPa (69.6 ksi) — weaker than 92% of steel grades. Elongation at break is 22% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
11SMnPb30-HR is rated for continuous service to 250°C (482 °F). It conducts heat at 48 W/m·K (27.7 BTU/hr·ft·°F), better than 79% of steel grades. Thermal expansion is 11.5 µm/m·K (6.39 µin/in·°F).
Electrical3
11SMnPb30-HR conducts electricity at 9.5 % IACS, better than 74% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (10/100), worse than 87% of steel grades.
Sustainability4
Producing a kilogram of 11SMnPb30-HR takes about 25 MJ of energy and emits 2 kg of CO₂ — less than 82% of steel grades. Typical recycled content is 35%.
Manufacturability7
11SMnPb30-HR's machinability is excellent (88/100, better than 99% of steel grades); weldability not recommended (12/100); formability fair (35/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Other 11SMnPb30 tempers and conditions
11SMnPb30 is also supplied in 5 other conditions. The full side-by-side table is on the 11SMnPb30 overview.
- HRDefaultCheapest bar form for large diameters or when parts are fully machined from oversize stock.260 MPa yield · 135 HB
- SHPick when higher yield strength / straightness is needed for slender turned or ground shafts.550 MPa yield · 200 HB
- CDDefault stock condition: close tolerance h9/h11 bright bar for automatic-lathe / CNC turning of small parts.420 MPa yield · 170 HB
- CRUse for cold-rolled flats, squares and hexagons where a smooth as-rolled surface and tight thickness are wanted.410 MPa yield · 165 HB
- AnnealedUse when maximum ductility for cold heading, staking or riveting is required, accepting lower strength.240 MPa yield · 120 HB
Working with 11SMnPb30-HR
Is 11SMnPb30 easy to machine?
Outstanding: high speeds with HSS or carbide, short broken chips, excellent surface and long tool life — the benchmark free-cutting steel for automatic lathes.
Can 11SMnPb30 be welded?
Not recommended — high sulphur and lead cause hot cracking and porosity; if unavoidable, use low-hydrogen filler, preheat and fume extraction for Pb.
Can 11SMnPb30 be formed, bent or molded?
Poor cold formability and bendability due to MnS/Pb inclusions; only light cold heading or staking in the annealed condition, hot forming above ~1150 °C with care.
What surface finishes work on 11SMnPb30?
No anodizing; protect by zinc or Zn-Ni electroplating, phosphating, black oxide or oiling. Case-carbonitriding or salt-bath nitrocarburising can be applied for wear surfaces.
11SMnPb30 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 | 0.1 |
| Silow Si to keep chips brittle | ≤ 0.05 | 0.03 |
| Mn | 0.9 – 1.3 | 1.1 |
| P | ≤ 0.11 | 0.06 |
| SMnS inclusions for chip breaking | 0.27 – 0.33 | 0.3 |
| Pbfree-machining additive | 0.2 – 0.35 | 0.27 |
| Fe | balance | — |
11SMnPb30-HR — frequently asked
What is 11SMnPb30-HR used for?
11SMnPb30-HR is typically used for screw machine parts, hydraulic and pneumatic fittings, threaded inserts and nuts, bushings and spacers, connector shells and low-pressure valve stems. In short: leaded free-machining bar.
What is the yield strength of 11SMnPb30-HR?
11SMnPb30-HR has a typical yield strength of 260 MPa (37.7 ksi) and a tensile strength of 480 MPa (69.6 ksi) — weaker than 92% of steel grades. Strength varies by condition: see the 6 listed tempers.
Is 11SMnPb30-HR easy to machine?
Yes — machinability is rated excellent (88/100, better than 99% of steel grades). Outstanding: high speeds with HSS or carbide, short broken chips, excellent surface and long tool life — the benchmark free-cutting steel for automatic lathes.
Can 11SMnPb30-HR be welded?
Not readily — weldability is rated not recommended (12/100). Not recommended — high sulphur and lead cause hot cracking and porosity; if unavoidable, use low-hydrogen filler, preheat and fume extraction for Pb.
What surface finishes work on 11SMnPb30-HR?
No anodizing; protect by zinc or Zn-Ni electroplating, phosphating, black oxide or oiling. Case-carbonitriding or salt-bath nitrocarburising can be applied for wear surfaces.
Can 11SMnPb30-HR be formed, bent or molded?
Poor cold formability and bendability due to MnS/Pb inclusions; only light cold heading or staking in the annealed condition, hot forming above ~1150 °C with care.
What is the maximum service temperature of 11SMnPb30-HR?
11SMnPb30-HR is rated for continuous use to about 250°C (482 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 11SMnPb30-HR and 11SMnPb30-SH?
HR is the default condition — cheapest bar form for large diameters or when parts are fully machined from oversize stock. SH: pick when higher yield strength / straightness is needed for slender turned or ground shafts. Yield strength is 260 MPa in HR versus 550 MPa in SH.
Can FabDigit make parts in 11SMnPb30-HR?
Yes — 11SMnPb30-HR 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)
- Bright bar 1.0718 free-cutting steel data — European bright bar producers (2023)
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.