Steel 6CrW2Si
GB 6CrW2Si · AISI/SAE S1
6CrW2Si is a Cr-W-Si shock-resisting tool steel of the S1 type, supplied annealed, hot-rolled or cold-drawn and hardened to 40–43, 45–48, 50–52, 53–55 or 56–58 HRC.
Reference datasheet — 6CrW2Si 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 Annealed condition
6CrW2Si tempers and conditions
6CrW2Si is supplied in 8 conditions, soft to hard. Annealed is the default FabDigit quotes; the values on this page are for it.
Compare all 8 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AnnealedDefault spheroidize/soft annealed bar as supplied | Standard stock condition for machining and forming before hardening; ≤285 HB per GB/T 1299. | 450 | 760 | 18 | 240 HB | — |
Cold drawn | Bright, size-accurate small-diameter bar for chisel and punch blanks needing little pre-machining. | 640 | 880 | 10 | 27 HRC | 6.2 % IACS |
Hot rolled | As-rolled or as-forged bar and flats; harder and less uniform — anneal before machining. | 650 | 1,000 | 10 | 34 HRC | 6.2 % IACS |
oil quench 870 °C + temper ~520 °C | Soft-tempered condition for high-toughness structural tool parts; wear resistance is largely given up. | 1,180 | 1,330 | 12 | 42 HRC | 6 % IACS |
oil quench 870 °C + temper ~420 °C | Maximum-toughness hardened state for shanks, drivers and tool bodies subject to severe shock or bending. | 1,350 | 1,550 | 9 | 47 HRC | — |
oil quench 870 °C + temper ~320 °C | Toughness-biased setting for heavy-impact tools such as rivet sets, hot chisel bodies and shear blades. | 1,500 | 1,750 | 6 | 51 HRC | — |
oil quench 870 °C + temper ~250 °C | Common working hardness for pneumatic bits and cold chisels — good balance of edge life and impact resistance. | 1,600 | 1,900 | 4 | 54 HRC | — |
oil quench 870 °C + temper ~200 °C | Maximum hardness condition for chisels and punches where edge retention matters more than shock toughness. | 1,750 | 2,100 | 2 | 57 HRC | — |
What is 6CrW2Si?
6CrW2Si is a Cr-W-Si shock-resisting tool steel of the S1 type, supplied annealed, hot-rolled or cold-drawn and hardened to 40–43, 45–48, 50–52, 53–55 or 56–58 HRC. Annealed bar shows 450 MPa yield, 760 MPa tensile, 18% elongation and 240 HB, and the tungsten addition keeps toughness high at working hardness for hand and power tools that take repeated impact. Machinability (35) and cold formability (25) are low, corrosion resistance is nil and service temperature is limited to about 400 °C; the air-hardening S7-type 6CrMnSi2Mo1V is the alternative when distortion control matters. 6CrW2Si has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,420°C (2,588 °F). 6CrW2Si has a yield strength of 450 MPa (65.3 ksi) and a tensile strength of 760 MPa (110 ksi) — stronger than 52% of steel grades. Elongation at break is 18% and the elastic modulus is 207 GPa (30 Msi).
What is 6CrW2Si used for?
- Chisels
- Pneumatic tool bits
- Punches
Limitations
- High embodied carbon — 2.6 kg CO₂/kg, worse than 87% of steel grades
- Difficult to machine — 35/100, worse than 84% of steel grades
- Difficult to weld — 20/100, worse than 84% of steel grades
- Poor heat conductor — 33 W/m·K (19.1 BTU/hr·ft·°F), worse than 80% of steel grades
6CrW2Si properties
Typical room-temperature values for 6CrW2Si-Annealed; bars are the position among steel grades.
Physical3
6CrW2Si has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,420°C (2,588 °F).
Mechanical15
6CrW2Si has a yield strength of 450 MPa (65.3 ksi) and a tensile strength of 760 MPa (110 ksi) — stronger than 52% of steel grades. Elongation at break is 18% and the elastic modulus is 207 GPa (30 Msi).
Thermal6
6CrW2Si is rated for continuous service to 400°C (752 °F). It conducts heat at 33 W/m·K (19.1 BTU/hr·ft·°F), worse than 80% of steel grades. Thermal expansion is 12.4 µm/m·K (6.89 µin/in·°F).
Electrical2
6CrW2Si has an electrical resistivity of 2.8×10⁻⁷ Ω·m.
Chemical & Environmental2
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of 6CrW2Si takes about 35 MJ of energy and emits 2.6 kg of CO₂ — more than 87% of steel grades. Typical recycled content is 35%.
Manufacturability8
6CrW2Si's machinability is fair (35/100, worse than 84% of steel grades); weldability poor (20/100); formability poor (25/100).
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. 6CrW2Si is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 6CrW2Si
Is 6CrW2Si easy to machine?
Machine in the annealed condition (≤285 HB) with rigid setups and cobalt-HSS or coated carbide; after hardening only grinding, EDM or CBN is practical.
Can 6CrW2Si be welded?
Weld only for repair: preheat 300–400 °C, use matched or tool-steel filler, keep interpass hot and re-temper immediately to avoid quench cracking.
Can 6CrW2Si be formed, bent or molded?
Hot forge 1050–1150 °C, stop above ~900 °C and cool slowly, then anneal 800–820 °C furnace-cool; cold forming is limited to mild bending of annealed stock.
6CrW2Si 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 | 0.55 – 0.65 | 0.6 |
| Siraises tempering resistance and toughness | 0.5 – 0.8 | 0.65 |
| Mn | ≤ 0.4 | 0.25 |
| Cr | 1 – 1.3 | 1.15 |
| Wcarbide former, grain refinement | 2.2 – 2.7 | 2.45 |
| Niresidual | ≤ 0.25 | |
| Curesidual | ≤ 0.3 | |
| P | ≤ 0.03 | |
| S | ≤ 0.03 | |
| Fe | balance |
What surface finishes work on 6CrW2Si?
Harden from 860–900 °C in oil and temper 200–520 °C to target hardness; finish with grinding plus black oxide, phosphate or oil coating for rust protection.
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 6CrW2Si in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- AISI / SAE
- S1
How much does 6CrW2Si cost?
6CrW2Si 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.
6CrW2Si — frequently asked
What is 6CrW2Si used for?
6CrW2Si is typically used for chisels, pneumatic tool bits and punches. In short: impact-tough tool steel; tougher than water-hardening grades; oil-hardening shock grade.
What is the yield strength of 6CrW2Si?
6CrW2Si has a typical yield strength of 450 MPa (65.3 ksi) and a tensile strength of 760 MPa (110 ksi) — stronger than 52% of steel grades. Strength varies by condition: see the 8 listed tempers.
Is 6CrW2Si easy to machine?
Not especially — machinability is rated fair (35/100, worse than 84% of steel grades). Machine in the annealed condition (≤285 HB) with rigid setups and cobalt-HSS or coated carbide; after hardening only grinding, EDM or CBN is practical.
Can 6CrW2Si be welded?
Not readily — weldability is rated poor (20/100). Weld only for repair: preheat 300–400 °C, use matched or tool-steel filler, keep interpass hot and re-temper immediately to avoid quench cracking.
What surface finishes work on 6CrW2Si?
Harden from 860–900 °C in oil and temper 200–520 °C to target hardness; finish with grinding plus black oxide, phosphate or oil coating for rust protection.
Can 6CrW2Si be formed, bent or molded?
Hot forge 1050–1150 °C, stop above ~900 °C and cool slowly, then anneal 800–820 °C furnace-cool; cold forming is limited to mild bending of annealed stock.
What is the maximum service temperature of 6CrW2Si?
6CrW2Si 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 6CrW2Si Annealed and 6CrW2Si-HR?
Annealed is the default condition — standard stock condition for machining and forming before hardening; ≤285 HB per GB/T 1299. HR: as-rolled or as-forged bar and flats; harder and less uniform — anneal before machining. Yield strength is 450 MPa in Annealed versus 650 MPa in HR.
How much does 6CrW2Si cost?
6CrW2Si 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
- GB/T 1299 (Alloy Tool Steels) — SAC / (2014)
- ASTM A681 Standard Specification for Tool Steels Alloy (S1) — ASTM International (2015)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels, and High-Performance Alloys (Tool Steels) — ASM International (1990)
- Tool Steels, 5th ed. (Roberts, Krauss, Kennedy) — ASM International (1998)
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.