Steel 11SMn30 · supply condition · default condition
Steel 11SMn30-HR
Properties of the HR condition, compared with the other 11SMn30 tempers.
Cheapest input stock for large diameters or where the bar will be peeled, forged or drawn afterwards.
What is 11SMn30-HR?
11SMn30-HR is 11SMn30 supplied in the HR condition — cheapest input stock for large diameters or where the bar will be peeled, forged or drawn afterwards. 11SMn30-HR has a yield strength of 250 MPa (36.3 ksi) and a tensile strength of 420 MPa (60.9 ksi) — weaker than 94% of steel grades. Elongation at break is 22% and the elastic modulus is 205 GPa (29.7 Msi). 11SMn30-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 — 82/100, better than 98% of steel grades
- Low embodied carbon — 1.9 kg CO₂/kg, better than 92% 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
- Hard to polish — 30/100, worse than 100% of steel grades
- Difficult to weld — 12/100, worse than 96% of steel grades
- Low strength — 250 MPa (36.3 ksi), worse than 94% of steel grades
- Limited service temperature — 300°C (572 °F), worse than 77% of steel grades
11SMn30-HR properties
Typical room-temperature values for 11SMn30-HR — 12 properties are specific to this condition; the rest are grade-level values shared by every 11SMn30 temper. Each bar shows where the value sits among the steel grades in FabDigit's library — further right is higher.
Physical3
11SMn30-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).
Mechanical15
11SMn30-HR has a yield strength of 250 MPa (36.3 ksi) and a tensile strength of 420 MPa (60.9 ksi) — weaker than 94% of steel grades. Elongation at break is 22% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
11SMn30-HR 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
11SMn30-HR 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 11SMn30-HR takes about 25 MJ of energy and emits 1.9 kg of CO₂ — less than 82% of steel grades. Typical recycled content is 30%.
Manufacturability7
11SMn30-HR's machinability is very good (82/100, better than 98% 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 11SMn30 tempers and conditions
11SMn30 is also supplied in 5 other conditions. The full side-by-side table is on the 11SMn30 overview.
- HRDefaultCheapest input stock for large diameters or where the bar will be peeled, forged or drawn afterwards.250 MPa yield · 125 HB
- CRCold-rolled flats, squares and shaped bars where a bright surface and tight thickness tolerance are needed.460 MPa yield · 180 HB
- CDStandard stocked form for automatic-lathe work: good size tolerance (h9/h11), straightness and chip control.420 MPa yield · 170 HB
- AnnealedChoose when maximum ductility for secondary forming or minimum residual stress before precision machining is required.230 MPa yield · 112 HB
Working with 11SMn30-HR
Is 11SMn30 easy to machine?
Benchmark free-cutting steel — short chips, high feeds/speeds, long tool life; ideal for CNC swiss/automatic lathes, but keep cuts light on thin walls due to low ductility.
Can 11SMn30 be welded?
Not recommended: 0.3% S and up to 0.11% P cause hot cracking and porosity; use mechanical joining or switch to a weldable grade.
Can 11SMn30 be formed, bent or molded?
Poor cold heading, bending and riveting behaviour (sulfide stringers split transversely); hot forming above 1050 °C only, with care against hot shortness.
What surface finishes work on 11SMn30?
No anodizing; protect with zinc/nickel plating, black oxide or phosphate + oil — plating baths can leach inclusions, so degrease thoroughly and avoid aggressive pickling.
11SMn30 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 |
| Sirimmed/low-Si practice | ≤ 0.05 | 0.03 |
| Mn | 0.9 – 1.3 | 1.1 |
| Pdeliberately high for chip breaking | ≤ 0.11 | 0.06 |
| SMnS free-machining inclusions | 0.27 – 0.33 | 0.3 |
| Fe | balance | — |
11SMn30-HR — frequently asked
What is 11SMn30-HR used for?
11SMn30-HR is typically used for screw machine parts, threaded fasteners, hydraulic and pneumatic fittings, bushings and spacers, pins and dowels and instrument and connector bodies. In short: free-machining sulfurized bar.
What is the yield strength of 11SMn30-HR?
11SMn30-HR has a typical yield strength of 250 MPa (36.3 ksi) and a tensile strength of 420 MPa (60.9 ksi) — weaker than 94% of steel grades. Strength varies by condition: see the 6 listed tempers.
Is 11SMn30-HR easy to machine?
Yes — machinability is rated very good (82/100, better than 98% of steel grades). Benchmark free-cutting steel — short chips, high feeds/speeds, long tool life; ideal for CNC swiss/automatic lathes, but keep cuts light on thin walls due to low ductility.
Can 11SMn30-HR be welded?
Not readily — weldability is rated not recommended (12/100). Not recommended: 0.3% S and up to 0.11% P cause hot cracking and porosity; use mechanical joining or switch to a weldable grade.
What surface finishes work on 11SMn30-HR?
No anodizing; protect with zinc/nickel plating, black oxide or phosphate + oil — plating baths can leach inclusions, so degrease thoroughly and avoid aggressive pickling.
Can 11SMn30-HR be formed, bent or molded?
Poor cold heading, bending and riveting behaviour (sulfide stringers split transversely); hot forming above 1050 °C only, with care against hot shortness.
What is the maximum service temperature of 11SMn30-HR?
11SMn30-HR 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 11SMn30-HR and 11SMn30-CR?
HR is the default condition — cheapest input stock for large diameters or where the bar will be peeled, forged or drawn afterwards. CR: cold-rolled flats, squares and shaped bars where a bright surface and tight thickness tolerance are needed. Yield strength is 250 MPa in HR versus 460 MPa in CR.
Can FabDigit make parts in 11SMn30-HR?
Yes — 11SMn30-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)
- Free-cutting steel bright bar datasheets (Ovako / Saarstahl / Deutsche Edelstahlwerke) — various (2022)
- GB/T 8731 (Y15 equivalent) — SAC (2008)
- SMM / Mysteel 1688 (2025)
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.