Steel W6Mo5Cr4V2 · hardness band
Steel W6Mo5Cr4V2 Q&T 64-66 HRC
Properties of the Q&T 64-66 HRC condition, compared with the other W6Mo5Cr4V2 tempers.
Use for high-wear finishing cutters and form tools with rigid, vibration-free cutting conditions; chipping risk is high.
What is W6Mo5Cr4V2 Q&T 64-66 HRC?
W6Mo5Cr4V2 Q&T 64-66 HRC is W6Mo5Cr4V2 heat treated to Q&T 64-66 HRC — use for high-wear finishing cutters and form tools with rigid, vibration-free cutting conditions; chipping risk is high. W6Mo5Cr4V2 Q&T 64-66 HRC has a yield strength of 570 MPa (82.7 ksi) and a tensile strength of 850 MPa (123 ksi) — stronger than 74% of steel grades. Elongation at break is 12% and the elastic modulus is 222 GPa (32.2 Msi). W6Mo5Cr4V2 Q&T 64-66 HRC has a density of 8.16 g/cm³ (0.295 lb/in³), heavier than 97% of steel grades. It melts at 1,250°C (2,282 °F). Annealed is the default condition FabDigit quotes; Q&T 64-66 HRC is available on request or by drawing note.
Advantages
- High service temperature — 600°C (1,112 °F), better than 98% of steel grades
- Polishes to a fine finish — 70/100, better than 87% of steel grades
Limitations
- Low fracture toughness — 15 MPa·√m (13.7 ksi·√in), worse than 100% of steel grades
- Difficult to machine — 3/100, worse than 100% of steel grades
- High embodied carbon — 3.6 kg CO₂/kg, worse than 93% of steel grades
- Poor heat conductor — 24 W/m·K (13.9 BTU/hr·ft·°F), worse than 90% of steel grades
- Low electrical conductivity — 3.1 % IACS, worse than 89% of steel grades
W6Mo5Cr4V2 Q&T 64-66 HRC properties
Typical room-temperature values for W6Mo5Cr4V2 Q&T 64-66 HRC — 10 properties are specific to this condition; the rest are grade-level values shared by every W6Mo5Cr4V2 temper. Each bar shows where the value sits among the steel grades in FabDigit's library — further right is higher.
Physical3
W6Mo5Cr4V2 Q&T 64-66 HRC has a density of 8.16 g/cm³ (0.295 lb/in³), heavier than 97% of steel grades. It melts at 1,250°C (2,282 °F).
Mechanical17
W6Mo5Cr4V2 Q&T 64-66 HRC has a yield strength of 570 MPa (82.7 ksi) and a tensile strength of 850 MPa (123 ksi) — stronger than 74% of steel grades. Elongation at break is 12% and the elastic modulus is 222 GPa (32.2 Msi).
Thermal6
W6Mo5Cr4V2 Q&T 64-66 HRC is rated for continuous service to 600°C (1,112 °F). It conducts heat at 24 W/m·K (13.9 BTU/hr·ft·°F), worse than 90% of steel grades. Thermal expansion is 10.1 µm/m·K (5.61 µin/in·°F).
Electrical3
W6Mo5Cr4V2 Q&T 64-66 HRC conducts electricity at 3.1 % IACS, worse than 89% of steel grades.
Chemical & Environmental2
Corrosion resistance is poor (18/100), better than 83% of steel grades.
Sustainability4
Producing a kilogram of W6Mo5Cr4V2 Q&T 64-66 HRC takes about 55 MJ of energy and emits 3.6 kg of CO₂ — more than 94% of steel grades. Typical recycled content is 40%.
Manufacturability8
W6Mo5Cr4V2 Q&T 64-66 HRC's machinability is not recommended (3/100, worse than 100% of steel grades); weldability poor (18/100); formability poor (15/100).
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Other W6Mo5Cr4V2 tempers and conditions
W6Mo5Cr4V2 is also supplied in 6 other conditions. The full side-by-side table is on the W6Mo5Cr4V2 overview.
- AnnealedDefaultStandard as-delivered condition for machining tool blanks before hardening.570 MPa yield · 23 HRC
- Q&T 62-64 HRCThe normal working hardness for drills, taps, end mills and hobs — best balance of wear resistance and toughness.2,300 MPa tensile
- Q&T 60-62 HRCChoose for interrupted-cut or shock-loaded tooling — punches, shear blades, heavy-duty broaches — where toughness beats peak wear resistance.2,100 MPa tensile
- Q&T 64-66 HRCUse for high-wear finishing cutters and form tools with rigid, vibration-free cutting conditions; chipping risk is high.65 HRC
Working with W6Mo5Cr4V2 Q&T 64-66 HRC
Is W6Mo5Cr4V2 easy to machine?
Machine only in the annealed state with sharp carbide or cobalt-HSS tooling, rigid setups and flood coolant; hardened stock requires grinding, EDM or ceramic/CBN cutting.
Can W6Mo5Cr4V2 be welded?
Not a structural weld alloy — repair-weld with matched HSS filler, 500–550 °C preheat and immediate temper to avoid quench cracks.
Can W6Mo5Cr4V2 be formed, bent or molded?
Hot work 1100→900 °C with slow furnace cooling and mandatory soft anneal (840–870 °C, slow cool) afterwards; cold bending is impractical.
What surface finishes work on W6Mo5Cr4V2?
No anodising; use steam oxide, black oxide or phosphate for storage and anti-galling, nitriding for wear, and TiN/TiAlN PVD (≤500 °C) for cutting tools.
W6Mo5Cr4V2 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 |
|---|---|---|
| CGB/T 9943; 'C' variant of HS6-5-2 | 0.8 – 0.9 | 0.85 |
| Si | 0.2 – 0.45 | 0.3 |
| Mn | 0.15 – 0.4 | 0.3 |
| Cr | 3.8 – 4.4 | 4.1 |
| W | 5.5 – 6.75 | 6.2 |
| Mo | 4.5 – 5.5 | 5 |
| V | 1.75 – 2.2 | 1.95 |
| Coresidual, not intentionally added | ≤ 0.5 | — |
| Curesidual | ≤ 0.25 | — |
| P | ≤ 0.03 | — |
| SS-enhanced free-machining versions run higher | ≤ 0.03 | — |
| Fe | balance | — |
W6Mo5Cr4V2 Q&T 64-66 HRC — frequently asked
What is W6Mo5Cr4V2 Q&T 64-66 HRC used for?
W6Mo5Cr4V2 Q&T 64-66 HRC is typically used for twist drills, milling cutters and reamers. In short: workhorse high-speed tool.
What is the yield strength of W6Mo5Cr4V2 Q&T 64-66 HRC?
W6Mo5Cr4V2 Q&T 64-66 HRC has a typical yield strength of 570 MPa (82.7 ksi) and a tensile strength of 850 MPa (123 ksi) — stronger than 74% of steel grades. Strength varies by condition: see the 7 listed tempers.
Is W6Mo5Cr4V2 Q&T 64-66 HRC easy to machine?
Not especially — machinability is rated not recommended (3/100, worse than 100% of steel grades). Machine only in the annealed state with sharp carbide or cobalt-HSS tooling, rigid setups and flood coolant; hardened stock requires grinding, EDM or ceramic/CBN cutting.
Can W6Mo5Cr4V2 Q&T 64-66 HRC be welded?
Not readily — weldability is rated poor (18/100). Not a structural weld alloy — repair-weld with matched HSS filler, 500–550 °C preheat and immediate temper to avoid quench cracks.
What surface finishes work on W6Mo5Cr4V2 Q&T 64-66 HRC?
No anodising; use steam oxide, black oxide or phosphate for storage and anti-galling, nitriding for wear, and TiN/TiAlN PVD (≤500 °C) for cutting tools.
Can W6Mo5Cr4V2 Q&T 64-66 HRC be formed, bent or molded?
Hot work 1100→900 °C with slow furnace cooling and mandatory soft anneal (840–870 °C, slow cool) afterwards; cold bending is impractical.
What is the maximum service temperature of W6Mo5Cr4V2 Q&T 64-66 HRC?
W6Mo5Cr4V2 Q&T 64-66 HRC is rated for continuous use to about 600°C (1,112 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Can FabDigit make parts in W6Mo5Cr4V2 Q&T 64-66 HRC?
Yes — W6Mo5Cr4V2 Q&T 64-66 HRC is available for CNC machining with instant online pricing. Upload a STEP file to get a price and a DFM check.
Sources
- GB/T 9943 (High-speed tool steel bars) (2008)
- ASTM A600 — Tool Steel, High Speed (M2) — ASTM (2021)
- EN ISO 4957 — Tool steels (HS6-5-2C, 1.3343) — ISO/CEN (2018)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys (High-Speed Steels) — ASM International (1990)
- HS6-5-2C / M2 high speed steel datasheet — Böhler / Erasteel / (2023)
- W6Mo5Cr4V2 (2026)
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.