Steel 32CrAlMo7-10
EN 32CrAlMo7-10
32CrAlMo7-10 (1.8505) is an aluminum-alloyed chromium-molybdenum nitriding steel in the EN 10085 group; the aluminum addition forms hard nitrides that give an extremely hard, wear-resistant case over a tough quenched-and-tempered core.
Reference datasheet — 32CrAlMo7-10 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 +QT condition
32CrAlMo7-10 tempers and conditions
32CrAlMo7-10 is supplied in 6 conditions, soft to hard. +QT is the default FabDigit quotes; the values on this page are for it.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Delivery condition for bar/forging stock that will be rough-machined and then quenched and tempered by the user. | 450 | 720 | 20 | 225 HB | — |
Normalized | Grain-refining condition after forging, usually an intermediate step before final quench and temper. | 560 | 880 | 15 | 27 HRC | 7 % IACS |
+QT | Large-diameter forged bar and rolls; lowest guaranteed core strength band of the grade. | 650 | 850 | 14 | 27 HRC | 7 % IACS |
+QT | Same heat treatment on heavier bar/forging where reduced cooling rate lowers the guaranteed strength band. | 700 | 900 | 13 | 29 HRC | 7 % IACS |
+QTDefault Quenched and tempered | Standard supply and pre-nitriding condition: tough tempered-martensite core with high enough temper temperature (≥ 580 °C) to stay dimensionally stable during nitriding. | 760 | 950 | 12 | 31 HRC | — |
+QT + gas/plasma nitrided | Final in-service condition: 0.2–0.6 mm diffusion case at 900–1050 HV1 for maximum wear and fatigue performance on gears, spindles and screws. | 760 | 950 | 11 | 68 HRC | — |
What is 32CrAlMo7-10?
32CrAlMo7-10 (1.8505) is an aluminum-alloyed chromium-molybdenum nitriding steel in the EN 10085 group; the aluminum addition forms hard nitrides that give an extremely hard, wear-resistant case over a tough quenched-and-tempered core. It is specified for precision gears and spindles, supplied as bar, forgings and pre-machined blanks, with 760 MPa yield, 950 MPa tensile, 12 % elongation and about 300 HB (31 HRC) in +QT and service to 500 °C. The steel is effectively non-weldable, has no inherent corrosion resistance and machines slowly (machinability 42). 24CrMo13-6 is the nearest alternative when a less hard case is acceptable. 32CrAlMo7-10 has a density of 7.78 g/cm³ (0.281 lb/in³), lighter than 91% of steel grades. It melts at 1,420°C (2,588 °F). 32CrAlMo7-10 has a yield strength of 760 MPa (110 ksi) and a tensile strength of 950 MPa (138 ksi) — stronger than 85% of steel grades. Elongation at break is 12% and the elastic modulus is 210 GPa (30.5 Msi).
What is 32CrAlMo7-10 used for?
- Precision gears
- Machine tool spindles
- Wear-resistant shafts
- Cylinder liners
Advantages
- High service temperature — 500°C (932 °F), better than 90% of steel grades
- Polishes to a fine finish — 70/100, better than 87% of steel grades
- High strength — 760 MPa (110 ksi), better than 85% of steel grades
Limitations
- Difficult to weld — 18/100, worse than 87% of steel grades
- Limited ductility — 12%, worse than 84% of steel grades
- Poor heat conductor — 33 W/m·K (19.1 BTU/hr·ft·°F), worse than 80% of steel grades
- Limited formability — 22/100, worse than 76% of steel grades
32CrAlMo7-10 properties
Typical room-temperature values for 32CrAlMo7-10-+QT; bars are the position among steel grades.
Physical3
32CrAlMo7-10 has a density of 7.78 g/cm³ (0.281 lb/in³), lighter than 91% of steel grades. It melts at 1,420°C (2,588 °F).
Mechanical16
32CrAlMo7-10 has a yield strength of 760 MPa (110 ksi) and a tensile strength of 950 MPa (138 ksi) — stronger than 85% of steel grades. Elongation at break is 12% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
32CrAlMo7-10 is rated for continuous service to 500°C (932 °F). It conducts heat at 33 W/m·K (19.1 BTU/hr·ft·°F), worse than 80% of steel grades. Thermal expansion is 11.5 µm/m·K (6.39 µin/in·°F).
Electrical3
32CrAlMo7-10 conducts electricity at 7 % IACS, worse than 74% of steel grades.
Chemical & Environmental3
Corrosion resistance is poor (16/100), better than 79% of steel grades.
Sustainability4
Producing a kilogram of 32CrAlMo7-10 takes about 34 MJ of energy and emits 2.4 kg of CO₂ — more than 82% of steel grades. Typical recycled content is 30%.
Manufacturability6
32CrAlMo7-10's machinability is fair (42/100, worse than 73% of steel grades); weldability poor (18/100); formability poor (22/100).
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. 32CrAlMo7-10 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 32CrAlMo7-10
Is 32CrAlMo7-10 easy to machine?
Rough machine soft-annealed, finish in the +QT condition with carbide at moderate speed leaving 0.05–0.15 mm grinding stock; after nitriding only grinding/lapping is possible.
Can 32CrAlMo7-10 be welded?
Effectively non-weldable for structural joints — high Al, Cr and C cause cracking; if unavoidable, preheat 300–350 °C, matching filler and immediate stress relief, and never weld a nitrided surface.
Can 32CrAlMo7-10 be formed, bent or molded?
Hot forge 1100→850 °C with slow cooling and normalising; cold forming is not practical at Q&T strength levels.
32CrAlMo7-10 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 | 0.28 – 0.35 | 0.32 |
| Si | ≤ 0.4 | 0.25 |
| Mn | 0.4 – 0.7 | 0.55 |
| P | ≤ 0.03 | |
| Smax; lower for high-cleanliness variants | ≤ 0.04 | |
| Cr | 1.5 – 1.8 | 1.65 |
| Mo | 0.25 – 0.4 | 0.32 |
| Alnitride former giving the very hard case | 0.8 – 1.2 | 1 |
| Fe | balance |
What surface finishes work on 32CrAlMo7-10?
Stress-relieve before nitriding, mask threads/holes, then gas or plasma nitride at 500–530 °C; post-oxidation, phosphating or black oxide add mild corrosion protection — do not hard chrome plate over a nitrided compound layer without stripping it.
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 32CrAlMo7-10 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- 1.8505
How much does 32CrAlMo7-10 cost?
32CrAlMo7-10 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.
32CrAlMo7-10 — frequently asked
What is 32CrAlMo7-10 used for?
32CrAlMo7-10 is typically used for precision gears, machine tool spindles, wear-resistant shafts and cylinder liners. In short: hardest nitrided case; tough core, hard surface; not weldable.
What is the yield strength of 32CrAlMo7-10?
32CrAlMo7-10 has a typical yield strength of 760 MPa (110 ksi) and a tensile strength of 950 MPa (138 ksi) — stronger than 85% of steel grades. Strength varies by condition: see the 6 listed tempers.
Is 32CrAlMo7-10 easy to machine?
Not especially — machinability is rated fair (42/100, worse than 73% of steel grades). Rough machine soft-annealed, finish in the +QT condition with carbide at moderate speed leaving 0.05–0.15 mm grinding stock; after nitriding only grinding/lapping is possible.
Can 32CrAlMo7-10 be welded?
Not readily — weldability is rated poor (18/100). Effectively non-weldable for structural joints — high Al, Cr and C cause cracking; if unavoidable, preheat 300–350 °C, matching filler and immediate stress relief, and never weld a nitrided surface.
What surface finishes work on 32CrAlMo7-10?
Stress-relieve before nitriding, mask threads/holes, then gas or plasma nitride at 500–530 °C; post-oxidation, phosphating or black oxide add mild corrosion protection — do not hard chrome plate over a nitrided compound layer without stripping it.
Can 32CrAlMo7-10 be formed, bent or molded?
Hot forge 1100→850 °C with slow cooling and normalising; cold forming is not practical at Q&T strength levels.
What is the maximum service temperature of 32CrAlMo7-10?
32CrAlMo7-10 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 32CrAlMo7-10 cost?
32CrAlMo7-10 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 (38CrMoAl comparison grade) — 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 1.8505 / 32CrAlMo7-10 bar datasheet — European special-steel producers (Böhler, Ovako, Lucchini class data) (2022)
- 38CrMoAl — Mysteel / 1688 (2026)
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.