Steel EN41B Normalized
Heat-treated state
BS EN41B
Use for uniform grain size and stress relief on hot-worked bar prior to hardening.
Values for the Normalized condition
Other EN41B tempers and conditions
EN41B is listed in 6 conditions; see the grade overview at EN41B.
- Annealed
- Normalized
- Q&T
- Q&T+Nitrided
- Q&T-U
- Q&T-V
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
soft, spheroidised/full anneal for machining | Choose for rough machining or deep drilling of blanks before hardening and nitriding. | 450 | 700 | 20 | 200 HB | — |
NormalizedThis page air cooled from ~900 °C | Use for uniform grain size and stress relief on hot-worked bar prior to hardening. | 560 | 830 | 17 | 22 HRC | 8 % IACS |
Q&TDefault Quenched and tempered | Standard stocked condition: tough core ready for finish machining and subsequent nitriding. | 740 | 925 | 15 | 27 HRC | — |
Q&T + gas/plasma nitrided | The service condition for EN41B: use where extreme surface hardness, scuff and wear resistance with minimal distortion are needed. | 740 | 925 | 14 | 68 HRC | — |
Q&T condition U | Pick when a stronger core is needed under the nitrided case, e.g. highly loaded shafts. | 820 | 1,000 | 13 | 31 HRC | 7.8 % IACS |
Q&T condition V | Highest normally supplied core strength; accept reduced toughness and harder machining. | 880 | 1,075 | 11 | 33 HRC | 7.8 % IACS |
What is EN41B Normalized?
EN41B Normalized is EN41B heat treated to Normalized — use for uniform grain size and stress relief on hot-worked bar prior to hardening. EN41B Normalized has a yield strength of 560 MPa (81.2 ksi) and a tensile strength of 830 MPa (120 ksi) — stronger than 73% of steel grades. Elongation at break is 17% and the elastic modulus is 205 GPa (29.7 Msi). EN41B Normalized has a density of 7.8 g/cm³ (0.282 lb/in³), lighter than 87% of steel grades. It melts at 1,420°C (2,588 °F). Q&T is the default condition FabDigit quotes; Normalized is available on request or by drawing note.
Advantages
- Polishes to a fine finish — 70/100, better than 87% of steel grades
- High service temperature — 450°C (842 °F), better than 86% of steel grades
Limitations
- Difficult to weld — 22/100, worse than 81% of steel grades
- Low fracture toughness — 62 MPa·√m (56.4 ksi·√in), worse than 76% of steel grades
EN41B Normalized properties
Typical room-temperature values for EN41B Normalized; 23 are specific to this condition. Other listed values are EN41B reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
EN41B Normalized has a density of 7.8 g/cm³ (0.282 lb/in³), lighter than 87% of steel grades. It melts at 1,420°C (2,588 °F).
Mechanical16
EN41B Normalized has a yield strength of 560 MPa (81.2 ksi) and a tensile strength of 830 MPa (120 ksi) — stronger than 73% of steel grades. Elongation at break is 17% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
EN41B Normalized is rated for continuous service to 450°C (842 °F). It conducts heat at 42 W/m·K (24.3 BTU/hr·ft·°F), worse than 56% of steel grades. Thermal expansion is 12 µm/m·K (6.67 µin/in·°F).
Electrical2
EN41B Normalized has an electrical resistivity of 2.15×10⁻⁷ Ω·m.
Chemical & Environmental2
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of EN41B Normalized takes about 34 MJ of energy and emits 2.3 kg of CO₂ — more than 82% of steel grades. Typical recycled content is 30%.
Manufacturability6
EN41B Normalized's machinability is good (55/100, better than 62% of steel grades); weldability poor (22/100); formability poor (30/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with EN41B Normalized
Is EN41B easy to machine?
Machines like a 30 HRC Cr-Mo steel — rigid setups, coated carbide, moderate speeds; finish-machine before nitriding and leave only 0.02–0.05 mm for lapping afterwards.
Can EN41B be welded?
Effectively non-weldable for structural joints (0.4 %C plus 1.1 %Al); if unavoidable, preheat 300–350 °C, use low-hydrogen consumables and post-weld temper, and never weld nitrided surfaces.
Can EN41B be formed, bent or molded?
Hot forge 1050–1150 °C with slow cooling and a full anneal afterwards; cold forming is not practical in Q&T condition.
What surface finishes work on EN41B?
Gas or plasma nitride 500–530 °C for 900–1100 HV cases (0.2–0.6 mm); remove any brittle white layer by lapping, then oil, phosphate or black-oxide for corrosion protection.
EN41B 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 |
|---|---|---|
| C | 0.35 – 0.45 | 0.4 |
| Si | 0.1 – 0.4 | 0.25 |
| Mn | 0.4 – 0.65 | 0.55 |
| Cr | 1.4 – 1.8 | 1.6 |
| Mo | 0.15 – 0.25 | 0.2 |
| Alforms hard AlN-rich nitrided case | 0.9 – 1.3 | 1.1 |
| P0.05 max in older BS 970 issues | ≤ 0.04 | — |
| S0.05 max in older BS 970 issues | ≤ 0.04 | — |
| Fe | balance | — |
EN41B Normalized — frequently asked
What is EN41B Normalized used for?
EN41B Normalized is typically used for nitrided industrial shafts, gear surfaces and gear shafts, plastic extruder screws and barrels, machine tool spindles, pump shafts and valve stems. In short: high-strength aerospace bar.
What is the yield strength of EN41B Normalized?
EN41B Normalized has a typical yield strength of 560 MPa (81.2 ksi) and a tensile strength of 830 MPa (120 ksi) — stronger than 73% of steel grades. Strength varies by condition: see the 6 listed tempers.
Is EN41B Normalized easy to machine?
Reasonably — machinability is rated good (55/100, better than 62% of steel grades). Machines like a 30 HRC Cr-Mo steel — rigid setups, coated carbide, moderate speeds; finish-machine before nitriding and leave only 0.02–0.05 mm for lapping afterwards.
Can EN41B Normalized be welded?
Not readily — weldability is rated poor (22/100). Effectively non-weldable for structural joints (0.4 %C plus 1.1 %Al); if unavoidable, preheat 300–350 °C, use low-hydrogen consumables and post-weld temper, and never weld nitrided surfaces.
What surface finishes work on EN41B Normalized?
Gas or plasma nitride 500–530 °C for 900–1100 HV cases (0.2–0.6 mm); remove any brittle white layer by lapping, then oil, phosphate or black-oxide for corrosion protection.
Can EN41B Normalized be formed, bent or molded?
Hot forge 1050–1150 °C with slow cooling and a full anneal afterwards; cold forming is not practical in Q&T condition.
What is the maximum service temperature of EN41B Normalized?
EN41B Normalized is rated for continuous use to about 450°C (842 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Can FabDigit make parts in EN41B Normalized?
Yes — EN41B Normalized is available for CNC machining and sheet metal; every part is priced by an engineer rather than instantly. Upload a STEP file to get a price and a DFM check.
Sources
- BS 970-3: Wrought steels — 905M39 (EN41B) — BSI (1991)
- GB/T 3077 — 38CrMoAlA — SAC (2015)
- ASM Handbook Vol.1: Properties and Selection — Irons, Steels — ASM International (1990)
- ASM Handbook Vol.4A: Steel Heat Treating — Nitriding — ASM International (2013)
- Nitriding steel 905M39 / 1.8509-type bar datasheet — Special steel stockholders (2022)
- 38CrMoAlA — 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.