Steel 41CrAlMo7-10
EN 41CrAlMo7-10 · GB 38CrMoAlA, 38KhMYuA
41CrAlMo7-10 (1.8509) is a European chromium-molybdenum-aluminium nitriding steel, alloyed with roughly 1 % aluminium so that gas nitriding forms a very hard, deep case on a quenched and tempered core.
Reference datasheet — 41CrAlMo7-10 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the +QT750 condition
41CrAlMo7-10 tempers and conditions
41CrAlMo7-10 is supplied in 7 conditions, soft to hard. +QT750 is the default FabDigit quotes; the values on this page are for it.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Pick for heavy stock removal, deep-hole drilling or cold sawing before the customer's own quench-and-temper cycle. | 460 | 760 | 18 | 225 HB | — |
Normalized | Intermediate condition after forging to refine grain before quench-and-temper; rarely a final delivery state. | 600 | 900 | 15 | 28 HRC | 7.2 % IACS |
Quenched and tempered, Rp0.2 ≥ 600 MPa | Heavy forged sections and large rolls where hardenability limits core properties. | 650 | 900 | 16 | 28 HRC | 6.9 % IACS |
Quenched and tempered, Rp0.2 ≥ 650 MPa | Same cycle on medium sections where mass effect lowers the through-hardened strength class. | 700 | 950 | 15 | 31 HRC | 6.9 % IACS |
+QT750Default Quenched and tempered, Rp0.2 ≥ 750 MPa | Standard stocked bar condition: oil/water quench from ~930 °C + temper ~600–680 °C, ready for finish machining and subsequent nitriding. | 800 | 1,050 | 14 | 34 HRC | — |
+QT + gas/plasma nitrided | Final service condition: hard AlN-rich case ≥950 HV, 0.3–0.8 mm deep, on a 950–1150 MPa core — for wear-loaded shafts, gears and extruder screws. | 800 | 1,050 | 12 | 67 HRC | — |
Quenched, tempered and peeled/ground bright bar | Pick when close diameter tolerance (h9/h11) and a decarb-free surface are needed straight from stock. | 800 | 1,050 | 14 | 34 HRC | 6.9 % IACS |
What is 41CrAlMo7-10?
41CrAlMo7-10 (1.8509) is a European chromium-molybdenum-aluminium nitriding steel, alloyed with roughly 1 % aluminium so that gas nitriding forms a very hard, deep case on a quenched and tempered core. Engineers select it over 34CrAlMo5 for greater case depth and higher core strength; it is supplied as Q&T bar, forged blanks and tube, typically 800 MPa yield, 1050 MPa tensile, 14 % elongation and 320 HB (34 HRC), with service to 500 °C. It is effectively non-weldable, machinability is low (score 40), and the steel has no inherent corrosion resistance, so the nitrided case or a phosphate/oxide finish must carry that duty. 31CrMo12 is the nearest alternative when higher core strength is needed. 41CrAlMo7-10 has a density of 7.75 g/cm³ (0.28 lb/in³), lighter than 93% of steel grades. It melts at 1,420°C (2,588 °F). 41CrAlMo7-10 has a yield strength of 800 MPa (116 ksi) and a tensile strength of 1,050 MPa (152 ksi) — stronger than 86% of steel grades. Elongation at break is 14% and the elastic modulus is 210 GPa (30.5 Msi).
What is 41CrAlMo7-10 used for?
- heavy-duty gears
- worm shafts
- hydraulic components
- extruder barrels
Advantages
- High service temperature — 500°C (932 °F), better than 90% of steel grades
- High strength — 800 MPa (116 ksi), better than 86% of steel grades
- Polishes to a fine finish — 65/100, better than 78% of steel grades
Limitations
- Difficult to weld — 15/100, worse than 91% of steel grades
- Limited formability — 15/100, worse than 87% of steel grades
- Poor heat conductor — 34 W/m·K (19.6 BTU/hr·ft·°F), worse than 77% of steel grades
- Difficult to machine — 40/100, worse than 77% of steel grades
- Limited ductility — 14%, worse than 75% of steel grades
41CrAlMo7-10 properties
Typical room-temperature values for 41CrAlMo7-10-+QT750; bars are the position among steel grades.
Physical3
41CrAlMo7-10 has a density of 7.75 g/cm³ (0.28 lb/in³), lighter than 93% of steel grades. It melts at 1,420°C (2,588 °F).
Mechanical16
41CrAlMo7-10 has a yield strength of 800 MPa (116 ksi) and a tensile strength of 1,050 MPa (152 ksi) — stronger than 86% of steel grades. Elongation at break is 14% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
41CrAlMo7-10 is rated for continuous service to 500°C (932 °F). It conducts heat at 34 W/m·K (19.6 BTU/hr·ft·°F), worse than 77% of steel grades. Thermal expansion is 11.5 µm/m·K (6.39 µin/in·°F).
Electrical2
41CrAlMo7-10 has an electrical resistivity of 2.5×10⁻⁷ Ω·m.
Chemical & Environmental3
Corrosion resistance is poor (15/100), better than 75% of steel grades.
Sustainability4
Producing a kilogram of 41CrAlMo7-10 takes about 32 MJ of energy and emits 2.3 kg of CO₂ — more than 70% of steel grades. Typical recycled content is 30%.
Manufacturability8
41CrAlMo7-10's machinability is fair (40/100, worse than 77% of steel grades); weldability poor (15/100); formability poor (15/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the steel family
Yield strength against density for every steel grade FabDigit runs. 41CrAlMo7-10 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 41CrAlMo7-10
Is 41CrAlMo7-10 easy to machine?
Machine fully in the +QT condition with coated carbide at moderate speed and rigid setups; leave only 0.05–0.10 mm grinding stock because the nitrided case cannot be heavily removed.
Can 41CrAlMo7-10 be welded?
Essentially not weldable in service condition — high carbon plus ~1 % Al gives hard, crack-prone HAZ; if unavoidable use high preheat, matching low-hydrogen filler and immediate stress relief.
Can 41CrAlMo7-10 be formed, bent or molded?
Hot forge 1100–850 °C followed by slow cooling and soft annealing; cold forming is impractical at 300+ HB.
41CrAlMo7-10 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 | 0.38 – 0.45 | 0.41 |
| Si | ≤ 0.4 | 0.25 |
| Mn | 0.4 – 0.7 | 0.55 |
| PEN 10085 max | ≤ 0.03 | |
| S≤0.005 for special-quality nitriding stock | ≤ 0.04 | |
| Cr | 1.5 – 1.8 | 1.65 |
| Mo | 0.25 – 0.35 | 0.3 |
| Alforms hard AlN in the nitrided case | 0.8 – 1.2 | 1 |
| Fe | balance |
What surface finishes work on 41CrAlMo7-10?
Stress-relieve at ~30 °C below the tempering temperature before nitriding at 500–530 °C; mask non-nitrided areas with copper or paste, then oil, phosphate or blacken for corrosion protection (no anodising).
Surface treatments FabDigit runs on steel parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Organic Coating
Black / Phosphate
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Steel 41CrAlMo7-10 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
How much does 41CrAlMo7-10 cost?
41CrAlMo7-10 is a budget-cost steel ($), cheaper than about 90% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
41CrAlMo7-10 — frequently asked
What is 41CrAlMo7-10 used for?
41CrAlMo7-10 is typically used for heavy-duty gears, worm shafts, hydraulic components and extruder barrels. In short: deep-case nitriding steel; stronger core than 34CrAlMo5; 500 °C service capability.
What is the yield strength of 41CrAlMo7-10?
41CrAlMo7-10 has a typical yield strength of 800 MPa (116 ksi) and a tensile strength of 1,050 MPa (152 ksi) — stronger than 86% of steel grades. Strength varies by condition: see the 7 listed tempers.
Is 41CrAlMo7-10 easy to machine?
Not especially — machinability is rated fair (40/100, worse than 77% of steel grades). Machine fully in the +QT condition with coated carbide at moderate speed and rigid setups; leave only 0.05–0.10 mm grinding stock because the nitrided case cannot be heavily removed.
Can 41CrAlMo7-10 be welded?
Not readily — weldability is rated poor (15/100). Essentially not weldable in service condition — high carbon plus ~1 % Al gives hard, crack-prone HAZ; if unavoidable use high preheat, matching low-hydrogen filler and immediate stress relief.
What surface finishes work on 41CrAlMo7-10?
Stress-relieve at ~30 °C below the tempering temperature before nitriding at 500–530 °C; mask non-nitrided areas with copper or paste, then oil, phosphate or blacken for corrosion protection (no anodising).
Can 41CrAlMo7-10 be formed, bent or molded?
Hot forge 1100–850 °C followed by slow cooling and soft annealing; cold forming is impractical at 300+ HB.
What is the maximum service temperature of 41CrAlMo7-10?
41CrAlMo7-10 is rated for continuous use to about 500°C (932 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does 41CrAlMo7-10 cost?
41CrAlMo7-10 is a budget-cost steel ($), cheaper than about 90% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- EN 10085 — Nitriding steels, technical delivery conditions — CEN (2001)
- GB/T 3077 — Alloy structural steels (38CrMoAlA) — SAC (2015)
- Nitriding steel 1.8509 / 41CrAlMo7-10 data sheet — Böhler / Deutsche Edelstahlwerke (2022)
- ASM Handbook Vol.4A — Steel Heat Treating / Nitriding — ASM International (2013)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels — ASM International (1990)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.