Steel 34CrAlMo5-10
EN 34CrAlMo5-10
34CrAlMo5-10 (1.8507) is a European low-alloy Al-Cr-Mo nitriding steel to EN 10085, supplied annealed, normalized or quenched and tempered and then gas or plasma nitrided.
Reference datasheet — 34CrAlMo5-10 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-100 condition
34CrAlMo5-10 tempers and conditions
34CrAlMo5-10 is supplied in 7 conditions, soft to hard. +QT-100 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 | Delivery condition for bar/forging stock that will be rough machined then quenched, tempered and nitrided. | 450 | 720 | 20 | 220 HB | — |
Normalized | Grain-refining condition for forgings before the final quench-and-temper cycle; rarely a final state. | 550 | 850 | 16 | 25 HRC | 8 % IACS |
annealed and cold drawn bar | Bright cold-drawn bar for small shafts and pins where tight tolerance stock is machined then nitrided. | 600 | 800 | 12 | 22 HRC | 8 % IACS |
+QT | Large forgings and thick screw/barrel blanks; lowest guaranteed strength class of the grade. | 620 | 800 | 16 | 24 HRC | 8 % IACS |
+QT | Same heat treatment on heavier bar/forging where mass effect lowers guaranteed strength. | 670 | 850 | 15 | 27 HRC | 8 % IACS |
+QT-100Default +QT | Standard stocked condition: oil/water quench from ~880 °C plus temper ~580–680 °C, ready for finish machining and nitriding. | 720 | 900 | 14 | 29 HRC | — |
+QT + gas/plasma nitrided | Final in-service condition: Q&T core with a 0.2–0.6 mm nitrided case for wear, scuffing and fatigue resistance. | 720 | 900 | 12 | 68 HRC | — |
What is 34CrAlMo5-10?
34CrAlMo5-10 (1.8507) is a European low-alloy Al-Cr-Mo nitriding steel to EN 10085, supplied annealed, normalized or quenched and tempered and then gas or plasma nitrided. It is used for bar and forged parts that need a very hard case — 0.2–0.6 mm deep at ≥800 HV1 — over a tough core with 720 MPa yield, 900 MPa tensile, 14 % elongation, 280 HB (29 HRC) and service to 500 °C. The high aluminium and chromium content makes it effectively unweldable, machinability is moderate (score 45), and the base steel has no corrosion resistance, so oiling, phosphating or black oxide is required. Cr-Mo-V nitriding grades are the nearest alternatives. 34CrAlMo5-10 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). 34CrAlMo5-10 has a yield strength of 720 MPa (104 ksi) and a tensile strength of 900 MPa (131 ksi) — stronger than 82% of steel grades. Elongation at break is 14% and the elastic modulus is 210 GPa (30.5 Msi).
What is 34CrAlMo5-10 used for?
- gears
- camshafts
- wear-resistant bushings
- extruder screws
Advantages
- High service temperature — 500°C (932 °F), better than 90% of steel grades
- High strength — 720 MPa (104 ksi), better than 82% of steel grades
- Polishes to a fine finish — 65/100, better than 78% of steel grades
Limitations
- Difficult to weld — 20/100, worse than 84% of steel grades
- Poor heat conductor — 34 W/m·K (19.6 BTU/hr·ft·°F), worse than 77% of steel grades
- Limited ductility — 14%, worse than 75% of steel grades
34CrAlMo5-10 properties
Typical room-temperature values for 34CrAlMo5-10-+QT-100; bars are the position among steel grades.
Physical3
34CrAlMo5-10 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
34CrAlMo5-10 has a yield strength of 720 MPa (104 ksi) and a tensile strength of 900 MPa (131 ksi) — stronger than 82% of steel grades. Elongation at break is 14% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
34CrAlMo5-10 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 12.3 µm/m·K (6.83 µin/in·°F).
Electrical3
34CrAlMo5-10 conducts electricity at 8 % IACS, better than 55% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of 34CrAlMo5-10 takes about 31 MJ of energy and emits 2.2 kg of CO₂ — more than 64% of steel grades. Typical recycled content is 30%.
Manufacturability6
34CrAlMo5-10's machinability is fair (45/100, worse than 65% of steel grades); weldability poor (20/100); formability poor (25/100).
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. 34CrAlMo5-10 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 34CrAlMo5-10
Is 34CrAlMo5-10 easy to machine?
Machine in the +A or +QT condition with carbide tooling and rigid setups; leave 0.05–0.15 mm grinding stock and stress-relieve at ~550 °C before nitriding to control distortion.
Can 34CrAlMo5-10 be welded?
Welding is not recommended — high Al and Cr promote hard, crack-sensitive HAZ; if unavoidable, preheat 300–350 °C, use matching or austenitic filler and temper immediately.
Can 34CrAlMo5-10 be formed, bent or molded?
Hot forge 1100→850 °C with slow furnace cooling then anneal; cold forming is limited to light straightening of annealed bar.
34CrAlMo5-10 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 | 0.3 – 0.37 | 0.34 |
| Si | ≤ 0.4 | 0.25 |
| Mn | 0.5 – 0.8 | 0.65 |
| P | ≤ 0.03 | |
| Smax; low-S variants for cleanliness | ≤ 0.04 | |
| Cr | 1 – 1.3 | 1.15 |
| Mo | 0.15 – 0.25 | 0.2 |
| Alforms hard AlN in the nitrided case | 0.8 – 1.2 | 1 |
| Fe | balance |
What surface finishes work on 34CrAlMo5-10?
Gas or plasma nitride 500–530 °C for a 0.2–0.6 mm case at ≥800 HV1; grind/lap lightly afterwards, and protect the uncoated steel with oil, phosphate or black oxide since it is not corrosion resistant.
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 34CrAlMo5-10 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- 1.850734CrAlMo5
- Similar grades
- En40B
How much does 34CrAlMo5-10 cost?
34CrAlMo5-10 is a standard-cost steel ($$), cheaper than about 71% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
34CrAlMo5-10 — frequently asked
What is 34CrAlMo5-10 used for?
34CrAlMo5-10 is typically used for gears, camshafts, wear-resistant bushings and extruder screws. In short: highest nitrided case hardness; EN 10085 nitriding standard; not weldable in practice.
What is the yield strength of 34CrAlMo5-10?
34CrAlMo5-10 has a typical yield strength of 720 MPa (104 ksi) and a tensile strength of 900 MPa (131 ksi) — stronger than 82% of steel grades. Strength varies by condition: see the 7 listed tempers.
Is 34CrAlMo5-10 easy to machine?
Reasonably — machinability is rated fair (45/100, worse than 65% of steel grades). Machine in the +A or +QT condition with carbide tooling and rigid setups; leave 0.05–0.15 mm grinding stock and stress-relieve at ~550 °C before nitriding to control distortion.
Can 34CrAlMo5-10 be welded?
Not readily — weldability is rated poor (20/100). Welding is not recommended — high Al and Cr promote hard, crack-sensitive HAZ; if unavoidable, preheat 300–350 °C, use matching or austenitic filler and temper immediately.
What surface finishes work on 34CrAlMo5-10?
Gas or plasma nitride 500–530 °C for a 0.2–0.6 mm case at ≥800 HV1; grind/lap lightly afterwards, and protect the uncoated steel with oil, phosphate or black oxide since it is not corrosion resistant.
Can 34CrAlMo5-10 be formed, bent or molded?
Hot forge 1100→850 °C with slow furnace cooling then anneal; cold forming is limited to light straightening of annealed bar.
What is the maximum service temperature of 34CrAlMo5-10?
34CrAlMo5-10 is rated for continuous use to about 500°C (932 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does 34CrAlMo5-10 cost?
34CrAlMo5-10 is a standard-cost steel ($$), cheaper than about 71% 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)
- DIN 17211 / material no. 1.8507 (superseded) — DIN (1987)
- BS 970 En40B — BSI (1991)
- GB/T 3077 — 38CrMoAl (near-equivalent) — SAC (2015)
- ASM Handbook Vol.4 — Heat Treating (Nitriding) — ASM International (1991)
- Nitriding steel 1.8507 bar datasheet — European special steel producers (2022)
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.