Steel 1541 · heat-treated state
Steel 1541-IH
Properties of the IH condition, compared with the other 1541 tempers.
Choose for wear surfaces — journals, spline flanks, track pins — where a 50–58 HRC case over a tough core is wanted; 1541's Mn content gives good hardenability without alloying.
What is 1541-IH?
1541-IH is 1541 heat treated to IH — choose for wear surfaces — journals, spline flanks, track pins — where a 50–58 HRC case over a tough core is wanted; 1541's Mn content gives good hardenability without alloying. 1541-IH has a yield strength of 840 MPa (122 ksi) and a tensile strength of 1,000 MPa (145 ksi) — stronger than 87% of steel grades. Elongation at break is 12% and the elastic modulus is 205 GPa (29.7 Msi). 1541-IH 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). HR is the default condition FabDigit quotes; IH is available on request or by drawing note.
Advantages
- High strength — 840 MPa (122 ksi), better than 87% 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 machine — 15/100, worse than 98% of steel grades
- Difficult to weld — 15/100, worse than 91% of steel grades
- Limited ductility — 12%, worse than 84% of steel grades
1541-IH properties
Typical room-temperature values for 1541-IH — 9 properties are specific to this condition; the rest are grade-level values shared by every 1541 temper. Each bar shows where the value sits among the steel grades in FabDigit's library — further right is higher.
Physical3
1541-IH 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).
Mechanical13
1541-IH has a yield strength of 840 MPa (122 ksi) and a tensile strength of 1,000 MPa (145 ksi) — stronger than 87% of steel grades. Elongation at break is 12% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
1541-IH is rated for continuous service to 400°C (752 °F). It conducts heat at 48 W/m·K (27.7 BTU/hr·ft·°F), better than 79% of steel grades. Thermal expansion is 11.7 µm/m·K (6.5 µin/in·°F).
Electrical3
1541-IH 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 1541-IH takes about 25 MJ of energy and emits 2 kg of CO₂ — less than 82% of steel grades. Typical recycled content is 35%.
Manufacturability7
1541-IH's machinability is poor (15/100, worse than 98% of steel grades); weldability poor (15/100); formability fair (40/100).
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Other 1541 tempers and conditions
1541 is also supplied in 6 other conditions. The full side-by-side table is on the 1541 overview.
- HRDefaultDefault stock condition for forging blanks, shafts and parts that will be heat treated or induction hardened later.415 MPa yield · 207 HB
- Q&THighest through-strength with useful toughness — the standard condition for axles, shafts, tie rods and high-strength fasteners.840 MPa yield · 31 HRC
- IHChoose for wear surfaces — journals, spline flanks, track pins — where a 50–58 HRC case over a tough core is wanted; 1541's Mn content gives good hardenability without alloying.840 MPa yield · 55 HRC
- CDCold-drawn round/hex bar for high-strength studs, bolts and machined shafts used without further heat treatment.700 MPa yield · 241 HB
- CRPick when close dimensional tolerance and a smooth surface are needed on strip or small sections; strength is up, ductility down.660 MPa yield · 235 HB
- NormalizedUniform fine-pearlitic structure for forgings — use to refine grain and stabilize properties before machining or induction hardening.450 MPa yield · 217 HB
- AnnealedSoftest condition — choose for heavy cold forming, deep machining or before rehardening.350 MPa yield · 170 HB
Working with 1541-IH
Is 1541 easy to machine?
Machines like a tough medium-carbon steel at ~60 % of 1212; use rigid setups, carbide inserts, 120–200 m/min turning speed, and normalize or spheroidize-anneal first for best surface finish.
Can 1541 be welded?
Carbon equivalent ~0.65–0.75 — preheat 200–300 °C, low-hydrogen consumables, control interpass temperature and temper after welding; avoid welding in the Q&T or induction-hardened condition.
Can 1541 be formed, bent or molded?
Hot forging (1100–1200 °C) and hot bending are straightforward; cold bending/heading needs the annealed condition and generous bend radii because of the high carbon plus manganese.
What surface finishes work on 1541?
No anodizing — protect with zinc or manganese phosphate, black oxide, zinc/zinc-nickel plating, hot-dip galvanizing (watch hydrogen embrittlement above ~1000 MPa) or paint over blasted surfaces.
1541 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 |
|---|---|---|
| CSAE 1541; 1541H grade range 0.35–0.45 | 0.36 – 0.44 | 0.4 |
| Mnhigh-Mn carbon steel, raises hardenability | 1.35 – 1.65 | 1.5 |
| P | ≤ 0.04 | — |
| Smax; resulfurized 1541 variants run higher | ≤ 0.05 | — |
| Sitypical for killed hot-rolled bar (not always specified) | 0.15 – 0.35 | 0.25 |
| Fe | balance | — |
1541-IH — frequently asked
What is 1541-IH used for?
1541-IH is typically used for drive shafts, industrial axles and gears. In short: workhorse machining bar.
What is the yield strength of 1541-IH?
1541-IH has a typical yield strength of 840 MPa (122 ksi) and a tensile strength of 1,000 MPa (145 ksi) — stronger than 87% of steel grades. Strength varies by condition: see the 7 listed tempers.
Is 1541-IH easy to machine?
Not especially — machinability is rated poor (15/100, worse than 98% of steel grades). Machines like a tough medium-carbon steel at ~60 % of 1212; use rigid setups, carbide inserts, 120–200 m/min turning speed, and normalize or spheroidize-anneal first for best surface finish.
Can 1541-IH be welded?
Not readily — weldability is rated poor (15/100). Carbon equivalent ~0.65–0.75 — preheat 200–300 °C, low-hydrogen consumables, control interpass temperature and temper after welding; avoid welding in the Q&T or induction-hardened condition.
What surface finishes work on 1541-IH?
No anodizing — protect with zinc or manganese phosphate, black oxide, zinc/zinc-nickel plating, hot-dip galvanizing (watch hydrogen embrittlement above ~1000 MPa) or paint over blasted surfaces.
Can 1541-IH be formed, bent or molded?
Hot forging (1100–1200 °C) and hot bending are straightforward; cold bending/heading needs the annealed condition and generous bend radii because of the high carbon plus manganese.
What is the maximum service temperature of 1541-IH?
1541-IH is rated for continuous use to about 400°C (752 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 1541-HR and 1541-IH?
HR is the default condition — default stock condition for forging blanks, shafts and parts that will be heat treated or induction hardened later. IH: choose for wear surfaces — journals, spline flanks, track pins — where a 50–58 HRC case over a tough core is wanted; 1541's Mn content gives good hardenability without alloying. Yield strength is 415 MPa in HR versus 840 MPa in IH.
Can FabDigit make parts in 1541-IH?
Yes — 1541-IH is available for CNC machining and sheet metal with instant online pricing. Upload a STEP file to get a price and a DFM check.
Sources
- SAE J403 — Chemical Compositions of SAE Carbon Steels — SAE International (2014)
- SAE J1397 — Estimated Mechanical Properties and Machinability of Steel Bars — SAE International (2009)
- ASTM A29/A29M — Steel Bars, Carbon and Alloy, Hot-Wrought — ASTM (2020)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- ASM Handbook Vol.4 — Heat Treating (induction hardening of carbon steels) — ASM International (1991)
- GB/T 699 / GB/T 3077 (comparable grades 40Mn, 40Mn2) — SAC (2015)
- Mysteel / SMM hot-rolled special bar steel price series (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.