Steel 38KhMYuA
EN 41CrAlMo7-10 · GB 38CrMoAlA
38KhMYuA is the CIS-standard chromium-molybdenum-aluminium nitriding steel, using roughly 1 % aluminium to form a high-hardness nitrided case on a quenched and tempered core; it is functionally equivalent to 38CrMoAlA and to European 41CrAlMo7-10.
Reference datasheet — 38KhMYuA 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 QT28-32 condition
38KhMYuA tempers and conditions
38KhMYuA is supplied in 7 conditions, soft to hard. QT28-32 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 |
|---|---|---|---|---|---|---|
Solution annealed | Softest supply condition for rough machining, deep drilling or cold work before quench-and-temper. | 420 | 700 | 20 | 210 HB | — |
Hot rolled | Mill as-rolled bar for customers who will do their own full heat treatment; hardness variable and machining awkward. | 560 | 880 | 15 | 26 HRC | 6.6 % IACS |
Normalized | Grain refinement and structure homogenisation before final Q&T, or for lightly loaded parts. | 600 | 880 | 16 | 25 HRC | 6.6 % IACS |
Cold drawn | Bright bar with close diameter tolerance for small shafts and screws that will be nitrided after finish machining. | 620 | 800 | 12 | 22 HRC | 6.6 % IACS |
QT28-32Default Q&T 28–32 HRC | Standard commercial condition: tough, machinable core that is dimensionally stable for subsequent gas nitriding. | 860 | 1,000 | 16 | 30 HRC | — |
Q&T + Gas Nitrided | Final service condition: glass-hard, wear- and scuff-resistant surface with high fatigue strength on a tough Q&T core. | 860 | 1,000 | 14 | 67 HRC | — |
Q&T 32–36 HRC | Higher-strength core for heavily loaded shafts and screws where some toughness is traded for strength. | 980 | 1,130 | 13 | 34 HRC | — |
What is 38KhMYuA?
38KhMYuA is the CIS-standard chromium-molybdenum-aluminium nitriding steel, using roughly 1 % aluminium to form a high-hardness nitrided case on a quenched and tempered core; it is functionally equivalent to 38CrMoAlA and to European 41CrAlMo7-10. It is bought as hot-rolled, cold-drawn and Q&T bar for nitrided wear surfaces, with default values of 860 MPa yield, 1000 MPa tensile, 16 % elongation and 300 HB (30 HRC) and service to 500 °C. Weldability is poor and the steel rusts without a coating. Availability outside CIS supply chains is limited, so 41CrAlMo7-10 is the usual substitute. 38KhMYuA has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 95% of steel grades. It melts at 1,420°C (2,588 °F). 38KhMYuA has a yield strength of 860 MPa (125 ksi) and a tensile strength of 1,000 MPa (145 ksi) — stronger than 89% of steel grades. Elongation at break is 16% and the elastic modulus is 210 GPa (30.5 Msi).
What is 38KhMYuA used for?
- gears
- shafts
- pump and valve parts
Advantages
- High service temperature — 500°C (932 °F), better than 90% of steel grades
- High strength — 860 MPa (125 ksi), better than 89% of steel grades
- Polishes to a fine finish — 65/100, better than 78% of steel grades
Limitations
- Difficult to weld — 18/100, worse than 87% of steel grades
- Limited formability — 20/100, worse than 80% of steel grades
- Poor heat conductor — 34 W/m·K (19.6 BTU/hr·ft·°F), worse than 77% of steel grades
- Low electrical conductivity — 6.6 % IACS, worse than 76% of steel grades
38KhMYuA properties
Typical room-temperature values for 38KhMYuA-QT28-32; bars are the position among steel grades.
Physical3
38KhMYuA has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 95% of steel grades. It melts at 1,420°C (2,588 °F).
Mechanical16
38KhMYuA has a yield strength of 860 MPa (125 ksi) and a tensile strength of 1,000 MPa (145 ksi) — stronger than 89% of steel grades. Elongation at break is 16% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
38KhMYuA 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 11.8 µm/m·K (6.56 µin/in·°F).
Electrical3
38KhMYuA conducts electricity at 6.6 % IACS, worse than 76% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (13/100), better than 66% of steel grades.
Sustainability4
Producing a kilogram of 38KhMYuA takes about 32 MJ of energy and emits 2.3 kg of CO₂ — more than 70% of steel grades. Typical recycled content is 30%.
Manufacturability6
38KhMYuA's machinability is fair (42/100, worse than 73% of steel grades); weldability poor (18/100); formability poor (20/100).
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. 38KhMYuA is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 38KhMYuA
Is 38KhMYuA easy to machine?
Rough machine in the annealed state; finish machine after Q&T at 28–32 HRC with carbide tooling, then leave 0.05–0.10 mm grinding stock for post-nitriding finishing since the nitrided case is essentially unmachinable.
Can 38KhMYuA be welded?
Poor weldability — high hardenability plus ~1 % Al gives hard, crack-prone HAZ and oxide inclusions; if unavoidable use 250–350 °C preheat, low-hydrogen consumables and immediate stress relief/temper, and never weld a nitrided surface.
Can 38KhMYuA be formed, bent or molded?
Hot forge at 1150–850 °C followed by slow cooling and annealing; cold forming is not practical above the annealed condition.
38KhMYuA 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 – 0.42 | 0.38 |
| Si | 0.2 – 0.45 | 0.3 |
| Mn | 0.3 – 0.6 | 0.45 |
| Cr | 1.35 – 1.65 | 1.5 |
| Mo | 0.15 – 0.25 | 0.2 |
| Alforms hard AlN in the nitrided case | 0.7 – 1.1 | 0.9 |
| Niresidual | ≤ 0.3 | |
| Curesidual | ≤ 0.3 | |
| S | ≤ 0.03 | |
| P | ≤ 0.03 | |
| Fe | balance |
What surface finishes work on 38KhMYuA?
Grind or lap after nitriding to restore tolerance; the white layer may be lightly removed; black oxide, phosphating or light oiling is used for rust protection — no anodizing applies.
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 38KhMYuA in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- 41CrAlMo7-10
- GB (China)
- 38CrMoAlA
- Other
- 38Kh2MYuA
How much does 38KhMYuA cost?
38KhMYuA 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.
38KhMYuA — frequently asked
What is 38KhMYuA used for?
38KhMYuA is typically used for gears, shafts and pump and valve parts. In short: CIS-standard nitriding steel; equivalent to 41CrAlMo7-10; high-hardness nitrided case.
What is the yield strength of 38KhMYuA?
38KhMYuA has a typical yield strength of 860 MPa (125 ksi) and a tensile strength of 1,000 MPa (145 ksi) — stronger than 89% of steel grades. Strength varies by condition: see the 7 listed tempers.
Is 38KhMYuA easy to machine?
Not especially — machinability is rated fair (42/100, worse than 73% of steel grades). Rough machine in the annealed state; finish machine after Q&T at 28–32 HRC with carbide tooling, then leave 0.05–0.10 mm grinding stock for post-nitriding finishing since the nitrided case is essentially unmachinable.
Can 38KhMYuA be welded?
Not readily — weldability is rated poor (18/100). Poor weldability — high hardenability plus ~1 % Al gives hard, crack-prone HAZ and oxide inclusions; if unavoidable use 250–350 °C preheat, low-hydrogen consumables and immediate stress relief/temper, and never weld a nitrided surface.
What surface finishes work on 38KhMYuA?
Grind or lap after nitriding to restore tolerance; the white layer may be lightly removed; black oxide, phosphating or light oiling is used for rust protection — no anodizing applies.
Can 38KhMYuA be formed, bent or molded?
Hot forge at 1150–850 °C followed by slow cooling and annealing; cold forming is not practical above the annealed condition.
What is the maximum service temperature of 38KhMYuA?
38KhMYuA 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.
What is the difference between 38KhMYuA QT28-32 and 38KhMYuA-A?
QT28-32 is the default condition — standard commercial condition: tough, machinable core that is dimensionally stable for subsequent gas nitriding. A: softest supply condition for rough machining, deep drilling or cold work before quench-and-temper. Yield strength is 860 MPa in QT28-32 versus 420 MPa in A.
How much does 38KhMYuA cost?
38KhMYuA 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
- ГОСТ 4543 Прокат из легированной конструкционной стали (38Х2МЮА) — Gosstandart (2016)
- GB/T 3077 (38CrMoAlA) — SAC (2015)
- EN 10085 Nitriding steels (41CrAlMo7-10, 1.8509) — CEN (2001)
- ASM Handbook Vol. 4 — Heat Treating (Nitriding) — ASM International (1991)
- 38CrMoAlA — Mysteel / 1688 (2025)
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.