Steel 6CrMnSi2Mo1V
GB 6CrMnSi2Mo1V
6CrMnSi2Mo1V is an air-hardening Si-Mn-Mo-V shock-resisting tool steel of the S7 type, stocked annealed or normalized and heat treated to 60–62 HRC as-quenched or tempered to 57–59, 54–56 or 50–52 HRC.
Reference datasheet — 6CrMnSi2Mo1V 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
6CrMnSi2Mo1V tempers and conditions
6CrMnSi2Mo1V is supplied in 6 conditions, soft to hard. Annealed is the default FabDigit quotes; the values on this page are for it.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AnnealedDefault spheroidize annealed, as supplied | Standard mill supply condition for bar and flat: soft enough to machine tools before hardening. | 490 | 780 | 20 | 217 HB | — |
900 °C air cool (pre-treatment before re-annealing) | Grain-refining pre-treatment on forgings; not a delivery or service condition, always followed by annealing. | 800 | 1,150 | 10 | 37 HRC | 2.7 % IACS |
Oil quench + temper ~380–420 °C | Toughest usable condition — pick for riveting sets, heavy shock punches and hot-shear-free impact tooling. | 1,480 | 1,750 | 8 | 51 HRC | — |
Oil quench + temper ~250–300 °C | Best all-round hardness/toughness balance for chisels, punches and pneumatic tool parts. | 1,650 | 1,950 | 5 | 55 HRC | — |
Oil quench + low temper | Maximum hardness / wear resistance for cold shear blades and punches where impact is moderate. | 1,800 | 2,150 | 3 | 58 HRC | — |
As-Quenched 60–62 HRC | Intermediate condition only — must be tempered immediately to avoid quench cracking. | 2,000 | 2,400 | 1 | 61 HRC | 2.5 % IACS |
What is 6CrMnSi2Mo1V?
6CrMnSi2Mo1V is an air-hardening Si-Mn-Mo-V shock-resisting tool steel of the S7 type, stocked annealed or normalized and heat treated to 60–62 HRC as-quenched or tempered to 57–59, 54–56 or 50–52 HRC. Engineers select it for punches, blades and pneumatic tooling machined from annealed bar (490 MPa yield, 780 MPa tensile, 20% elongation, 217 HB / 97 HRB) where impact toughness matters more than abrasion resistance, and air hardening keeps distortion low. It is not corrosion resistant, tops out near 400 °C service and has a machinability score of only 45; a high-carbon high-chromium grade such as D2 is the alternative where abrasive wear dominates. 6CrMnSi2Mo1V has a density of 7.76 g/cm³ (0.28 lb/in³), lighter than 92% of steel grades. It melts at 1,400°C (2,552 °F). 6CrMnSi2Mo1V has a yield strength of 490 MPa (71.1 ksi) and a tensile strength of 780 MPa (113 ksi) — stronger than 61% of steel grades. Elongation at break is 20% and the elastic modulus is 207 GPa (30 Msi).
What is 6CrMnSi2Mo1V used for?
- Punches
- Shear blades
- Pneumatic tools
Limitations
- Poor heat conductor — 22 W/m·K (12.7 BTU/hr·ft·°F), worse than 93% of steel grades
- High embodied carbon — 2.8 kg CO₂/kg, worse than 90% of steel grades
- Difficult to weld — 20/100, worse than 84% of steel grades
6CrMnSi2Mo1V properties
Typical room-temperature values for 6CrMnSi2Mo1V-Annealed; bars are the position among steel grades.
Physical3
6CrMnSi2Mo1V has a density of 7.76 g/cm³ (0.28 lb/in³), lighter than 92% of steel grades. It melts at 1,400°C (2,552 °F).
Mechanical12
6CrMnSi2Mo1V has a yield strength of 490 MPa (71.1 ksi) and a tensile strength of 780 MPa (113 ksi) — stronger than 61% of steel grades. Elongation at break is 20% and the elastic modulus is 207 GPa (30 Msi).
Thermal6
6CrMnSi2Mo1V 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 12.4 µm/m·K (6.89 µin/in·°F).
Electrical2
6CrMnSi2Mo1V has an electrical resistivity of 6×10⁻⁷ Ω·m.
Chemical & Environmental2
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of 6CrMnSi2Mo1V takes about 36 MJ of energy and emits 2.8 kg of CO₂ — more than 89% of steel grades. Typical recycled content is 40%.
Manufacturability8
6CrMnSi2Mo1V's machinability is fair (45/100, worse than 65% of steel grades); weldability poor (20/100); formability poor (30/100).
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. 6CrMnSi2Mo1V is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 6CrMnSi2Mo1V
Is 6CrMnSi2Mo1V easy to machine?
Machine only in the annealed state (≈200 HB, ~55 % of AISI 1212) with rigid setups and sharp carbide/HSS tooling; after hardening only grinding and EDM are practical, and EDM'd surfaces should be stress-relieved.
Can 6CrMnSi2Mo1V be welded?
Poor weldability — repair welding only with matching or low-hydrogen tool-steel filler, preheat 300–350 °C, keep interpass temperature, and temper immediately at the part's tempering temperature to avoid cracking.
Can 6CrMnSi2Mo1V be formed, bent or molded?
Hot forge 1050 → 900 °C with slow furnace cooling and mandatory anneal; cold forming is impractical, so shapes are machined from annealed bar and then hardened.
6CrMnSi2Mo1V 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 | 0.5 – 0.65 | 0.57 |
| Sihigh Si gives resistance to softening on tempering; increases decarburization tendency | 1.75 – 2.25 | 2 |
| Mn | 0.6 – 1 | 0.8 |
| Cr | 0.2 – 0.5 | 0.35 |
| MoChinese designation implies the upper (~1 %) Mo range | 0.2 – 1.35 | 0.9 |
| V | 0.15 – 0.35 | 0.25 |
| Pimpurity limit | ≤ 0.03 | |
| Simpurity limit | ≤ 0.03 | |
| Fe | balance |
What surface finishes work on 6CrMnSi2Mo1V?
Protect against decarburization during heat treatment (vacuum, controlled atmosphere or pack); finish with grinding plus black oxide, phosphating, nitriding or PVD/TiN for wear and rust protection — no anodizing.
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 6CrMnSi2Mo1V in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- Similar grades
- S7
How much does 6CrMnSi2Mo1V cost?
6CrMnSi2Mo1V is a premium-cost steel ($$$), cheaper than about 51% 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.
6CrMnSi2Mo1V — frequently asked
What is 6CrMnSi2Mo1V used for?
6CrMnSi2Mo1V is typically used for punches, shear blades and pneumatic tools. In short: highest-toughness shock grade; air hardening, low distortion; machined then hardened.
What is the yield strength of 6CrMnSi2Mo1V?
6CrMnSi2Mo1V has a typical yield strength of 490 MPa (71.1 ksi) and a tensile strength of 780 MPa (113 ksi) — stronger than 61% of steel grades. Strength varies by condition: see the 6 listed tempers.
Is 6CrMnSi2Mo1V easy to machine?
Reasonably — machinability is rated fair (45/100, worse than 65% of steel grades). Machine only in the annealed state (≈200 HB, ~55 % of AISI 1212) with rigid setups and sharp carbide/HSS tooling; after hardening only grinding and EDM are practical, and EDM'd surfaces should be stress-relieved.
Can 6CrMnSi2Mo1V be welded?
Not readily — weldability is rated poor (20/100). Poor weldability — repair welding only with matching or low-hydrogen tool-steel filler, preheat 300–350 °C, keep interpass temperature, and temper immediately at the part's tempering temperature to avoid cracking.
What surface finishes work on 6CrMnSi2Mo1V?
Protect against decarburization during heat treatment (vacuum, controlled atmosphere or pack); finish with grinding plus black oxide, phosphating, nitriding or PVD/TiN for wear and rust protection — no anodizing.
Can 6CrMnSi2Mo1V be formed, bent or molded?
Hot forge 1050 → 900 °C with slow furnace cooling and mandatory anneal; cold forming is impractical, so shapes are machined from annealed bar and then hardened.
What is the maximum service temperature of 6CrMnSi2Mo1V?
6CrMnSi2Mo1V 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.
How much does 6CrMnSi2Mo1V cost?
6CrMnSi2Mo1V is a premium-cost steel ($$$), cheaper than about 51% 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) (2014)
- ASTM A681 Standard Specification for Tool Steels Alloy — ASTM International (2022)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys (Tool Steels) — ASM International (1990)
- ASM Handbook Vol.4 — Heat Treating of Tool Steels — ASM International (1991)
- ASM Handbook Vol.16 — Machining (tool steel machinability ratings) — ASM International (1989)
- Shock-resisting tool steel (S5/S7 class) data sheets — Crucible / Böhler-Uddeholm (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.