Steel 38KhMYuA-CD (Cold drawn)
Supply condition
EN 41CrAlMo7-10 · GB 38CrMoAlA
Bright bar with close diameter tolerance for small shafts and screws that will be nitrided after finish machining.
Values for the CD condition
Other 38KhMYuA tempers and conditions
38KhMYuA is listed in 7 conditions; see the grade overview at 38KhMYuA.
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 |
CDThis page 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-CD?
38KhMYuA-CD is 38KhMYuA supplied in the CD condition — bright bar with close diameter tolerance for small shafts and screws that will be nitrided after finish machining. 38KhMYuA-CD has a yield strength of 620 MPa (89.9 ksi) and a tensile strength of 800 MPa (116 ksi) — stronger than 78% of steel grades. Elongation at break is 12% and the elastic modulus is 210 GPa (30.5 Msi). 38KhMYuA-CD 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). QT28-32 is the default condition FabDigit quotes; CD is available on request or by drawing note.
Advantages
- High strength — 620 MPa (89.9 ksi), better than 78% 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 ductility — 12%, worse than 84% of steel grades
- Limited formability — 18/100, worse than 84% of steel grades
- Low fracture toughness — 55 MPa·√m (50.1 ksi·√in), worse than 82% of steel grades
- Poor heat conductor — 34 W/m·K (19.6 BTU/hr·ft·°F), worse than 77% of steel grades
38KhMYuA-CD properties
Typical room-temperature values for 38KhMYuA-CD; 23 are specific to this condition. Other listed values are 38KhMYuA reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
38KhMYuA-CD 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-CD has a yield strength of 620 MPa (89.9 ksi) and a tensile strength of 800 MPa (116 ksi) — stronger than 78% of steel grades. Elongation at break is 12% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
38KhMYuA-CD is rated for continuous service to 350°C (662 °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-CD 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-CD 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-CD's machinability is fair (54/100, better than 54% of steel grades); weldability poor (18/100); formability poor (18/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 38KhMYuA-CD
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.
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.
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 | — |
38KhMYuA-CD — frequently asked
What is 38KhMYuA-CD used for?
38KhMYuA-CD 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-CD?
38KhMYuA-CD has a typical yield strength of 620 MPa (89.9 ksi) and a tensile strength of 800 MPa (116 ksi) — stronger than 78% of steel grades. Strength varies by condition: see the 7 listed tempers.
Is 38KhMYuA-CD easy to machine?
Reasonably — machinability is rated fair (54/100, better than 54% 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-CD 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-CD?
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-CD 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-CD?
38KhMYuA-CD is rated for continuous use to about 350°C (662 °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.
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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.