Steel 61SiCrV6
EN 61SiCrV6
61SiCrV6 (1.7115) is a silicon–chromium–vanadium alloyed spring steel from the EN spring-steel family, where the vanadium addition refines grain size and raises resistance to stress relaxation under sustained load.
Reference datasheet — 61SiCrV6 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 +QT48 condition
61SiCrV6 tempers and conditions
61SiCrV6 is supplied in 7 conditions, soft to hard. +QT48 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 |
|---|---|---|---|---|---|---|
Annealed | Pick for machining, cold drawing or cold forming of the blank before final hardening. | 500 | 800 | 15 | 230 HB | — |
Normalized | Uniform fine pearlitic structure for stock that will be re-austenitised; occasionally used for machining blanks. | 600 | 950 | 12 | 29 HRC | 5.9 % IACS |
Hot rolled | Mill supply condition for bar and rod destined for hot coiling and subsequent quench-and-temper. | 700 | 1,100 | 10 | 33 HRC | 5.8 % IACS |
Cold drawn | Bright close-tolerance bar or pre-drawn wire for spring coiling before hardening. | 800 | 950 | 8 | 30 HRC | 5.8 % IACS |
+QT | Tougher temper for heavy leaf/torsion springs and stabiliser bars where impact and shock matter more than peak stress. | 1,400 | 1,550 | 9 | 47 HRC | — |
+QT48Default +QT | Standard hardened-and-tempered spring condition — best balance of elastic limit, sag resistance and fatigue life. | 1,620 | 1,800 | 7 | 50 HRC | — |
+QT | Maximum-stress temper for small-section, shot-peened valve and clutch springs; low toughness, very defect-sensitive. | 1,780 | 1,950 | 5 | 54 HRC | — |
Supply forms, finishes and certifications
Ways 61SiCrV6 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
OT-VDSiCrV | OT wire | Surface finish |
What is 61SiCrV6?
61SiCrV6 (1.7115) is a silicon–chromium–vanadium alloyed spring steel from the EN spring-steel family, where the vanadium addition refines grain size and raises resistance to stress relaxation under sustained load. In the quenched-and-tempered condition it reaches about 1620 MPa yield and 1800 MPa tensile at 50 HRC with 7 % elongation, and is supplied as oil-tempered wire (OT-VDSiCrV), rod and bar in +AR, +A, +N, +C and +QT45/48/52 conditions for high-cycle valve and suspension springs. Limits are a service ceiling near 250 °C, low machinability (score 12) and no practical weldability. Where relaxation resistance is less critical, oil-tempered A401 chrome-silicon wire is the usual substitute. 61SiCrV6 has a density of 7.75 g/cm³ (0.28 lb/in³), lighter than 93% of steel grades. It melts at 1,420°C (2,588 °F). 61SiCrV6 has a yield strength of 1,620 MPa (235 ksi) and a tensile strength of 1,800 MPa (261 ksi) — stronger than 98% of steel grades. Elongation at break is 7% and the elastic modulus is 205 GPa (29.7 Msi).
What is 61SiCrV6 used for?
- High-performance valve springs
- Racing suspension springs
- High-fatigue coil springs
Advantages
- High strength — 1,620 MPa (235 ksi), better than 98% of steel grades
- Polishes to a fine finish — 65/100, better than 78% of steel grades
Limitations
- Difficult to machine — 12/100, worse than 99% of steel grades
- Limited formability — 8/100, worse than 97% of steel grades
- Limited ductility — 7%, worse than 96% of steel grades
- Difficult to weld — 12/100, worse than 96% of steel grades
- Low fracture toughness — 35 MPa·√m (31.9 ksi·√in), worse than 94% of steel grades
61SiCrV6 properties
Typical room-temperature values for 61SiCrV6-+QT48; bars are the position among steel grades.
Physical3
61SiCrV6 has a density of 7.75 g/cm³ (0.28 lb/in³), lighter than 93% of steel grades. It melts at 1,420°C (2,588 °F).
Mechanical16
61SiCrV6 has a yield strength of 1,620 MPa (235 ksi) and a tensile strength of 1,800 MPa (261 ksi) — stronger than 98% of steel grades. Elongation at break is 7% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
61SiCrV6 is rated for continuous service to 250°C (482 °F). It conducts heat at 33 W/m·K (19.1 BTU/hr·ft·°F), worse than 80% of steel grades. Thermal expansion is 11.5 µm/m·K (6.39 µin/in·°F).
Electrical3
61SiCrV6 conducts electricity at 5.7 % IACS, worse than 80% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (11/100), worse than 73% of steel grades.
Sustainability4
Producing a kilogram of 61SiCrV6 takes about 27 MJ of energy and emits 2 kg of CO₂ — less than 59% of steel grades. Typical recycled content is 30%.
Manufacturability7
61SiCrV6's machinability is not recommended (12/100, worse than 99% of steel grades); weldability not recommended (12/100); formability not recommended (8/100).
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. 61SiCrV6 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 61SiCrV6
Is 61SiCrV6 easy to machine?
Machine only in the soft-annealed state (≤248 HB) with carbide tooling; at 48–52 HRC finish by grinding, EDM or CBN turning.
Can 61SiCrV6 be welded?
Not recommended — ~0.6 %C gives hard, crack-prone HAZ and destroys the spring temper; if unavoidable, preheat 300–350 °C and re-heat-treat the whole part.
Can 61SiCrV6 be formed, bent or molded?
Cold coil in the annealed or oil-tempered condition, or hot coil at 850–950 °C; harden from 860–880 °C in oil and temper 400–480 °C to the target hardness, then stress-relieve after coiling.
61SiCrV6 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≈0.61 % C per EN designation | 0.58 – 0.65 | 0.61 |
| Sihigh Si raises elastic limit and sag resistance | 1.3 – 1.6 | 1.45 |
| Mn | 0.5 – 0.8 | 0.65 |
| Cr | 0.5 – 0.8 | 0.65 |
| Vgrain refinement, temper resistance | 0.1 – 0.2 | 0.15 |
| P | ≤ 0.03 | |
| Smax; ≤0.015 for valve-spring quality | ≤ 0.03 | |
| Fe | balance |
What surface finishes work on 61SiCrV6?
Always shot-peen springs for fatigue life; protect with phosphate + oil, Zn-flake or epoxy coating, and avoid acid pickling/electroplating unless a hydrogen-relief bake follows immediately.
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 61SiCrV6 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- 1.7115
How much does 61SiCrV6 cost?
61SiCrV6 is a budget-cost steel ($), cheaper than about 90% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
61SiCrV6 — frequently asked
What is 61SiCrV6 used for?
61SiCrV6 is typically used for high-performance valve springs, racing suspension springs and high-fatigue coil springs. In short: top-tier fatigue spring steel; vanadium-refined grain; high stress-relaxation resistance.
What is the yield strength of 61SiCrV6?
61SiCrV6 has a typical yield strength of 1,620 MPa (235 ksi) and a tensile strength of 1,800 MPa (261 ksi) — stronger than 98% of steel grades. Strength varies by condition: see the 7 listed tempers.
Is 61SiCrV6 easy to machine?
Not especially — machinability is rated not recommended (12/100, worse than 99% of steel grades). Machine only in the soft-annealed state (≤248 HB) with carbide tooling; at 48–52 HRC finish by grinding, EDM or CBN turning.
Can 61SiCrV6 be welded?
Not readily — weldability is rated not recommended (12/100). Not recommended — ~0.6 %C gives hard, crack-prone HAZ and destroys the spring temper; if unavoidable, preheat 300–350 °C and re-heat-treat the whole part.
What surface finishes work on 61SiCrV6?
Always shot-peen springs for fatigue life; protect with phosphate + oil, Zn-flake or epoxy coating, and avoid acid pickling/electroplating unless a hydrogen-relief bake follows immediately.
Can 61SiCrV6 be formed, bent or molded?
Cold coil in the annealed or oil-tempered condition, or hot coil at 850–950 °C; harden from 860–880 °C in oil and temper 400–480 °C to the target hardness, then stress-relieve after coiling.
What is the maximum service temperature of 61SiCrV6?
61SiCrV6 is rated for continuous use to about 250°C (482 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does 61SiCrV6 cost?
61SiCrV6 is a budget-cost steel ($), cheaper than about 90% 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 10089 — Hot rolled steels for quenched and tempered springs — CEN (2002)
- EN 10270-2 — Steel wire for mechanical springs: oil hardened and tempered spring steel wire — CEN (2011)
- EN 13906-1 — Cylindrical helical springs, design and calculation — CEN (2013)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys (spring steels) — ASM International (1990)
- Stahlschlüssel (Key to Steel) — Verlag Stahlschlüssel Wegst (2019)
- Si-Cr-V spring steel bar and oil-tempered valve spring wire datasheets — Ovako / Suzuki Garphyttan (2022)
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.