Steel 4330V-CD (Cold drawn)
Supply condition
AISI/SAE 4330V · UNS K23080 · AMS 6427
Choose annealed-then-cold-drawn bar for small diameters that need dimensional accuracy and a clean surface with no further heat treatment; elongation drops to 12%.
Values for the CD condition
Other 4330V tempers and conditions
4330V is listed in 12 conditions; see the grade overview at 4330V.
Compare all 12 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
full anneal, softest machinable condition | Pick the fully annealed condition at 217 HB for maximum machinability, cold working or straightening; the part must be re-quenched and tempered afterwards. | 550 | 760 | 22 | 217 HB | — |
Cold rolled | Pick annealed cold-rolled sheet or strip for blanking and forming thin parts, then quench and temper to final strength; as delivered it gives 830 MPa tensile at 15% elongation. | 620 | 830 | 15 | 24 HRC | 8 % IACS |
HRDefault Hot rolled | Use hot-rolled or as-forged bar as an untreated blank when you will rough machine and then quench and temper in house; as-supplied yield is only 720 MPa. | 720 | 1,000 | 14 | 31 HRC | 7.8 % IACS |
Normalized and tempered | Pick normalized and tempered for large cross-sections where reduced residual stress, moderate 725 MPa yield and stable toughness matter more than peak strength. | 725 | 930 | 18 | 29 HRC | 8 % IACS |
CDThis page Cold drawn | Choose annealed-then-cold-drawn bar for small diameters that need dimensional accuracy and a clean surface with no further heat treatment; elongation drops to 12%. | 760 | 900 | 12 | 27 HRC | 7.9 % IACS |
normalized (air cooled from austenitizing) | Use normalizing (air cooled from austenitizing) as the intermediate state to homogenize forgings at 302 HB in preparation for subsequent quenching and tempering. | 760 | 1,035 | 16 | 32 HRC | 7.8 % IACS |
Tempered to ~125 ksi UTS, sour-service hardness cap | Use the 28–32 HRC temper (~125 ksi UTS) for downhole tools in H2S service governed by the NACE hardness cap; it gives the best toughness and the lowest strength of the tempers. | 860 | 965 | 19 | 30 HRC | — |
Tempered to ~155 ksi UTS | Choose 32–36 HRC (~155 ksi UTS), the usual band for downhole tools and shafts, when strength must rise above the sour-service cap while impact toughness stays ample. | 1,000 | 1,105 | 17 | 34 HRC | — |
Quenched and tempered | Choose the most common stock quenched-and-tempered ~180 ksi (1240–1310 MPa) class at 36–40 HRC for balanced strength, toughness and machinability in aerospace structures and downhole tools. | 1,140 | 1,275 | 15 | 38 HRC | — |
Tempered to ~200 ksi UTS | Pick 40–44 HRC (~200 ksi UTS) for higher load capacity or wear resistance where the lower toughness and 13% elongation of this strength band are acceptable. | 1,275 | 1,415 | 13 | 42 HRC | — |
AMS 6427 aerospace strength level | Specify the AMS 6427 200–220 ksi (1380–1520 MPa) quench-and-temper level for aerospace structural parts that need high strength at 44 HRC together with good toughness. | 1,290 | 1,450 | 12 | 44 HRC | — |
highest standard strength level | Use the highest standard 220–240 ksi (1520–1655 MPa) level for weight-critical fittings and actuators, with strict control of hydrogen embrittlement and stress corrosion; elongation falls to 10%. | 1,410 | 1,590 | 10 | 47 HRC | — |
What is 4330V-CD?
4330V-CD is 4330V supplied in the CD condition — choose annealed-then-cold-drawn bar for small diameters that need dimensional accuracy and a clean surface with no further heat treatment; elongation drops to 12%. 4330V-CD has a yield strength of 760 MPa (110 ksi) and a tensile strength of 900 MPa (131 ksi) — stronger than 85% of steel grades. Elongation at break is 12% and the elastic modulus is 205 GPa (29.7 Msi). 4330V-CD has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,425°C (2,597 °F). HR is the default condition FabDigit quotes; CD is available on request or by drawing note.
Advantages
- 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
- Limited ductility — 12%, worse than 84% of steel grades
- High embodied carbon — 2.5 kg CO₂/kg, worse than 82% of steel grades
- Limited formability — 22/100, worse than 76% of steel grades
4330V-CD properties
Typical room-temperature values for 4330V-CD; 22 are specific to this condition. Other listed values are 4330V reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
4330V-CD has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,425°C (2,597 °F).
Mechanical16
4330V-CD has a yield strength of 760 MPa (110 ksi) and a tensile strength of 900 MPa (131 ksi) — stronger than 85% of steel grades. Elongation at break is 12% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
4330V-CD is rated for continuous service to 400°C (752 °F). It conducts heat at 43 W/m·K (24.8 BTU/hr·ft·°F), better than 51% of steel grades. Thermal expansion is 12.3 µm/m·K (6.83 µin/in·°F).
Electrical3
4330V-CD conducts electricity at 7.9 % IACS, better than 50% of steel grades.
Chemical & Environmental3
Corrosion resistance is poor (15/100), better than 75% of steel grades.
Sustainability4
Producing a kilogram of 4330V-CD takes about 36 MJ of energy and emits 2.5 kg of CO₂ — more than 89% of steel grades. Typical recycled content is 25%.
Manufacturability7
4330V-CD's machinability is good (55/100, better than 62% of steel grades); weldability fair (42/100); formability poor (22/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 4330V-CD
Is 4330V easy to machine?
In the annealed condition or at 28–36 HRC use coated carbide with low speed and heavy feed in a rigid setup; above 40 HRC prefer CBN/ceramic tooling or grinding. Rough machine with stock allowance and heat treat before final cuts to control distortion.
Can 4330V be welded?
Weldable but strongly hardening: use low-hydrogen or matching filler, preheat 200–320 °C, control interpass temperature, and temper and de-hydrogenate immediately after welding. Do not weld in the final high-strength condition without post-weld heat treatment.
Can 4330V be formed, bent or molded?
Cold forming capability is limited; bend and draw only in the annealed condition with generous radii. Forge at about 1150–950 °C and slow cool or normalize after forging to prevent cracking.
What surface finishes work on 4330V?
No corrosion resistance — typical finishes are hard chrome, electrolytic or electroless nickel, or phosphate plus primer. High-strength plated parts must be baked above 190 °C for 4–24 h to remove hydrogen; shot peening markedly improves fatigue life.
4330V 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 |
|---|---|---|
| CAMS 6427 | 0.28 – 0.33 | 0.3 |
| Mn | 0.75 – 1 | 0.88 |
| Si | 0.2 – 0.35 | 0.28 |
| Cr | 0.75 – 0.95 | 0.85 |
| Ni | 1.65 – 2 | 1.82 |
| Mo | 0.35 – 0.5 | 0.42 |
| Vgrain refinement, temper resistance | 0.05 – 0.1 | 0.07 |
| Pvacuum-melted limit | ≤ 0.01 | — |
| Svacuum-melted limit | ≤ 0.01 | — |
| Curesidual | ≤ 0.35 | — |
| Fe | balance | — |
4330V-CD — frequently asked
What is 4330V-CD used for?
4330V-CD is typically used for aircraft landing gear components, aircraft structural fittings, downhole drilling tools, high-pressure oil and gas tool bodies, drive shafts and torsion members and heavy-duty lugs and fasteners. In short: aerospace ultra-strength bar.
What is the yield strength of 4330V-CD?
4330V-CD has a typical yield strength of 760 MPa (110 ksi) and a tensile strength of 900 MPa (131 ksi) — stronger than 85% of steel grades. Strength varies by condition: see the 12 listed tempers.
Is 4330V-CD easy to machine?
Reasonably — machinability is rated good (55/100, better than 62% of steel grades). In the annealed condition or at 28–36 HRC use coated carbide with low speed and heavy feed in a rigid setup; above 40 HRC prefer CBN/ceramic tooling or grinding. Rough machine with stock allowance and heat treat before final cuts to control distortion.
Can 4330V-CD be welded?
With care — weldability is rated fair (42/100). Weldable but strongly hardening: use low-hydrogen or matching filler, preheat 200–320 °C, control interpass temperature, and temper and de-hydrogenate immediately after welding. Do not weld in the final high-strength condition without post-weld heat treatment.
What surface finishes work on 4330V-CD?
No corrosion resistance — typical finishes are hard chrome, electrolytic or electroless nickel, or phosphate plus primer. High-strength plated parts must be baked above 190 °C for 4–24 h to remove hydrogen; shot peening markedly improves fatigue life.
Can 4330V-CD be formed, bent or molded?
Cold forming capability is limited; bend and draw only in the annealed condition with generous radii. Forge at about 1150–950 °C and slow cool or normalize after forging to prevent cracking.
What is the maximum service temperature of 4330V-CD?
4330V-CD is rated for continuous use to about 400°C (752 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 4330V-HR and 4330V-CR?
HR is the default condition — use hot-rolled or as-forged bar as an untreated blank when you will rough machine and then quench and temper in house; as-supplied yield is only 720 MPa. CR: pick annealed cold-rolled sheet or strip for blanking and forming thin parts, then quench and temper to final strength; as delivered it gives 830 MPa tensile at 15% elongation. Yield strength is 720 MPa in HR versus 620 MPa in CR.
Can FabDigit make parts in 4330V-CD?
Yes — 4330V-CD is available for CNC machining and sheet metal; every part is priced by an engineer rather than instantly. Upload a STEP file to get a price and a DFM check.
Sources
- AMS 6427 — Steel Bars, Forgings and Tubing 0.95Cr-1.8Ni-0.35Mo-0.08V (0.28-0.33C) Vacuum Melted — SAE International (2020)
- SAE J404 / UNS K23080 alloy steel composition — SAE International (2019)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- ASM Handbook Vol.19 — Fatigue and Fracture — ASM International (1996)
- MMPDS-17 low-alloy steel typical property tables — Battelle/FAA (2022)
- 4330V vacuum-melted alloy steel bar datasheet (aerospace/oilfield bar producers) — specialty steel producers (2023)
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.