Steel X75WCrV18-4-1
EN X75WCrV18-4-1 · GB W18Cr4V
X75WCrV18-4-1 (1.3558) is a tungsten-chromium-vanadium high-speed-steel grade equivalent to AISI T1 (W18Cr4V, T12001), used as a high-temperature bearing steel for its hot hardness and wear resistance.
Reference datasheet — X75WCrV18-4-1 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 A condition
X75WCrV18-4-1 tempers and conditions
X75WCrV18-4-1 is supplied in 7 conditions, soft to hard. A 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 |
|---|---|---|---|---|---|---|
QT 60–62 HRC | Preferred bearing condition: slightly lower austenitizing temperature plus sub-zero and stabilizing tempers for maximum dimensional stability and toughness at 500 °C service. | 61 HRC | 20 W/m·K | |||
QT 62–64 HRC | General-purpose hardened condition balancing hot hardness and toughness for high-temperature bearings and cutting tools. | 63 HRC | 20 W/m·K | |||
ADefault Solution annealed | Standard stock condition for machining rings, blanks and tools before hardening. | 560 | 900 | 12 | 23 HRC | 22 W/m·K |
Stress relieved | Intermediate step for large rings to prevent distortion during subsequent hardening. | 570 | 910 | 12 | 24 HRC | 3.3 % IACS |
Cold drawn, annealed | Choose for small-diameter bar with close tolerance and good surface prior to hardening. | 700 | 980 | 8 | 26 HRC | 3.3 % IACS |
Hardened + tempered + surface nitrided / oxy-nitrided | Adds a 1000–1200 HV diffusion case for extra galling and adhesive-wear resistance on cages, tools and races. | 1,850 | 2,100 | 1 | 63 HRC | 3.1 % IACS |
QT 64–66 HRC | Maximum hardness and red hardness for wear-critical tooling; lowest toughness, use only for compressive-loaded parts. | 2,000 | 2,200 | 0.5 | 65 HRC | 3 % IACS |
What is X75WCrV18-4-1?
X75WCrV18-4-1 (1.3558) is a tungsten-chromium-vanadium high-speed-steel grade equivalent to AISI T1 (W18Cr4V, T12001), used as a high-temperature bearing steel for its hot hardness and wear resistance. Annealed stock runs near 245 HB / 23 HRC (900 MPa tensile, 560 MPa yield, 12 % elongation) and is hardened to about 60–66 HRC in the QT ranges on file. Thermal conductivity is low at 22 W/m·K, machinability is poor (score 33), the grade is not weldable, and it needs oil, phosphate or PVD coating for corrosion protection; listed maximum service temperature is 400 °C. X82WMoCrV6-5-4 (M2) is the lower-cost alternative. X75WCrV18-4-1 has a density of 8.7 g/cm³ (0.314 lb/in³), heavier than 99% of steel grades. It melts at 1,250°C (2,282 °F). X75WCrV18-4-1 has a yield strength of 560 MPa (81.2 ksi) and a tensile strength of 900 MPa (131 ksi) — stronger than 73% of steel grades. Elongation at break is 12% and the elastic modulus is 220 GPa (31.9 Msi).
What is X75WCrV18-4-1 used for?
- High-temperature rolling bearings
- Jet engine and turbine bearing components
- Hot-working bearing applications
Advantages
- Polishes to a fine finish — 70/100, better than 87% of steel grades
Limitations
- High embodied carbon — 4.2 kg CO₂/kg, worse than 95% of steel grades
- Poor heat conductor — 22 W/m·K (12.7 BTU/hr·ft·°F), worse than 93% of steel grades
- Low electrical conductivity — 3.3 % IACS, worse than 86% of steel grades
- Difficult to machine — 33/100, worse than 86% of steel grades
- Limited ductility — 12%, worse than 84% of steel grades
X75WCrV18-4-1 properties
Typical room-temperature values for X75WCrV18-4-1-A; bars are the position among steel grades.
Physical3
X75WCrV18-4-1 has a density of 8.7 g/cm³ (0.314 lb/in³), heavier than 99% of steel grades. It melts at 1,250°C (2,282 °F).
Mechanical14
X75WCrV18-4-1 has a yield strength of 560 MPa (81.2 ksi) and a tensile strength of 900 MPa (131 ksi) — stronger than 73% of steel grades. Elongation at break is 12% and the elastic modulus is 220 GPa (31.9 Msi).
Thermal6
X75WCrV18-4-1 is rated for continuous service to 400°C (752 °F). It conducts heat at 22 W/m·K (12.7 BTU/hr·ft·°F), worse than 93% of steel grades. Thermal expansion is 11 µm/m·K (6.11 µin/in·°F).
Electrical3
X75WCrV18-4-1 conducts electricity at 3.3 % IACS, worse than 86% of steel grades.
Chemical & Environmental2
Corrosion resistance is poor (15/100), better than 75% of steel grades.
Sustainability4
Producing a kilogram of X75WCrV18-4-1 takes about 58 MJ of energy and emits 4.2 kg of CO₂ — more than 95% of steel grades. Typical recycled content is 30%.
Manufacturability8
X75WCrV18-4-1's machinability is poor (33/100, worse than 86% of steel grades); weldability poor (20/100); 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. X75WCrV18-4-1 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with X75WCrV18-4-1
Is X75WCrV18-4-1 easy to machine?
Machine only in the annealed state (≤269 HB) with rigid setups, cobalt-HSS or coated carbide, low speed and heavy feed; after hardening the part must be ground with friable Al₂O₃ or CBN wheels and ample coolant to avoid grinding burn.
Can X75WCrV18-4-1 be welded?
Not a structural weldable steel — repair welding only with matching HSS filler, 500–550 °C preheat/interpass, immediate temper at 560 °C; otherwise cracking is nearly certain.
Can X75WCrV18-4-1 be formed, bent or molded?
Hot forge 1100–900 °C with slow, uniform heating (pre-heat 850 °C) and immediate slow furnace cooling to anneal; cold forming is not feasible.
X75WCrV18-4-1 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 |
|---|---|---|
| Cbearing version of T1 held to a narrow carbon band | 0.7 – 0.8 | 0.75 |
| Si | 0.1 – 0.45 | 0.3 |
| Mn | 0.1 – 0.4 | 0.3 |
| P | ≤ 0.03 | |
| Smax; ≤0.015 for aerospace bearing quality | ≤ 0.03 | |
| Cr | 3.8 – 4.5 | 4.15 |
| Wprimary red-hardness element | 17.2 – 18.7 | 18 |
| V | 1 – 1.25 | 1.1 |
| Moresidual/optional | ≤ 0.6 | 0.3 |
| Coresidual | ≤ 0.5 | |
| Fe | balance |
What surface finishes work on X75WCrV18-4-1?
Not anodizable; protect with oil, phosphate or black oxide, or apply nitriding/steam-oxide/PVD TiN-TiAlN. Hardened surfaces lap and superfinish to bearing-grade Ra <0.05 µm.
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 X75WCrV18-4-1 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
How much does X75WCrV18-4-1 cost?
X75WCrV18-4-1 is a high-cost steel ($$$$), pricier than about 78% 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.
X75WCrV18-4-1 — frequently asked
What is X75WCrV18-4-1 used for?
X75WCrV18-4-1 is typically used for high-temperature rolling bearings, jet engine and turbine bearing components and hot-working bearing applications. In short: T1-type bearing steel; best hot hardness here; 400 °C service capability.
What is the yield strength of X75WCrV18-4-1?
X75WCrV18-4-1 has a typical yield strength of 560 MPa (81.2 ksi) and a tensile strength of 900 MPa (131 ksi) — stronger than 73% of steel grades. Strength varies by condition: see the 7 listed tempers.
Is X75WCrV18-4-1 easy to machine?
Not especially — machinability is rated poor (33/100, worse than 86% of steel grades). Machine only in the annealed state (≤269 HB) with rigid setups, cobalt-HSS or coated carbide, low speed and heavy feed; after hardening the part must be ground with friable Al₂O₃ or CBN wheels and ample coolant to avoid grinding burn.
Can X75WCrV18-4-1 be welded?
Not readily — weldability is rated poor (20/100). Not a structural weldable steel — repair welding only with matching HSS filler, 500–550 °C preheat/interpass, immediate temper at 560 °C; otherwise cracking is nearly certain.
What surface finishes work on X75WCrV18-4-1?
Not anodizable; protect with oil, phosphate or black oxide, or apply nitriding/steam-oxide/PVD TiN-TiAlN. Hardened surfaces lap and superfinish to bearing-grade Ra <0.05 µm.
Can X75WCrV18-4-1 be formed, bent or molded?
Hot forge 1100–900 °C with slow, uniform heating (pre-heat 850 °C) and immediate slow furnace cooling to anneal; cold forming is not feasible.
What is the maximum service temperature of X75WCrV18-4-1?
X75WCrV18-4-1 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 X75WCrV18-4-1-A and X75WCrV18-4-1 QT64-66?
A is the default condition — standard stock condition for machining rings, blanks and tools before hardening. QT64-66: maximum hardness and red hardness for wear-critical tooling; lowest toughness, use only for compressive-loaded parts. Yield strength is 560 MPa in A versus 2,000 MPa in QT64-66.
How much does X75WCrV18-4-1 cost?
X75WCrV18-4-1 is a high-cost steel ($$$$), pricier than about 78% 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 ISO 4957 — Tool steels — CEN/ISO (2018)
- GB/T 9943 — High speed tool steel bars (W18Cr4V) — SAC (2008)
- ASTM A600 — Tool Steel, High Speed (T1) — ASTM (2016)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- ASM Handbook Vol.16 — Machining — ASM International (1989)
- High speed steel HS18-0-1 / T1 datasheet — Böhler / Erasteel (2020)
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.