Steel 45SiCrV6-2
EN 45SiCrV6-2
45SiCrV6-2 (1.8151) is a silicon-chromium-vanadium spring steel in the EN 10083 alloy-steel family, where high silicon raises the elastic limit and vanadium refines grain and stabilises the temper.
Reference datasheet — 45SiCrV6-2 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 +QT condition
45SiCrV6-2 tempers and conditions
45SiCrV6-2 is supplied in 9 conditions, soft to hard. +QT is the default FabDigit quotes; the values on this page are for it.
Compare all 9 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Spheroidize annealed | Softest supply condition — choose for cold heading, deep cold forming or heavy chip-removal before hardening. | 420 | 700 | 18 | 205 HB | — |
Annealed | Pick for machining, cold forming or straightening of bar before the final hardening operation. | 450 | 750 | 15 | 225 HB | — |
Treated for high shearability | Choose when bar or coil must be cold-sheared or cropped into blanks without cracking, prior to hot forming and hardening. | 470 | 780 | 14 | 21 HRC | 7 % IACS |
Supplied to the standard hardenability band | Order this when the end-quench (Jominy) response must be guaranteed within the normal H-band; usually delivered soft-annealed for later hardening. | 470 | 780 | 14 | 58 HRC | 7 % IACS |
Supplied to the restricted (narrow) hardenability band | Choose for high-volume heat-treated springs where scatter of as-quenched core hardness and distortion must be minimised. | 470 | 780 | 14 | 59 HRC | 7.5 % IACS |
Hot rolled | Cheapest supply form for forging shops that will re-austenitise and harden the part anyway. | 600 | 1,000 | 11 | 31 HRC | 7 % IACS |
Cold drawn | Choose for close-tolerance, bright bar used in torsion bars and clamping parts machined before hardening. | 800 | 950 | 8 | 29 HRC | 7 % IACS |
+QTDefault Quenched and tempered | Standard finished spring condition: oil-quenched from ~870 °C and tempered ~400–480 °C for maximum elastic limit and fatigue life. | 1,500 | 1,700 | 7 | 50 HRC | — |
Oil hardened and tempered spring wire/strip | Pre-hardened wire for coiling of valve-quality and suspension springs; only low-temperature stress relief after forming. | 1,750 | 1,950 | 6 | 54 HRC | — |
What is 45SiCrV6-2?
45SiCrV6-2 (1.8151) is a silicon-chromium-vanadium spring steel in the EN 10083 alloy-steel family, where high silicon raises the elastic limit and vanadium refines grain and stabilises the temper. It is chosen for high strength and fatigue resistance in springs and elastic components, and is supplied as wire, rod, flat bar and strip in +A, +AC, +S, +H, +CH, +QT, +AR, +C and OT conditions; in the default temper it reaches 1500 MPa yield, 1700 MPa tensile, 7 % elongation and about 490 HB (50 HRC). Limits are a 250 °C maximum service temperature, poor weldability (score 15), low formability (8) and machinability (28) in the hardened state, plus no inherent corrosion resistance. 54SiCrV6 is the nearest step up when a higher elastic limit is required. 45SiCrV6-2 has a density of 7.8 g/cm³ (0.282 lb/in³), lighter than 87% of steel grades. It melts at 1,420°C (2,588 °F). 45SiCrV6-2 has a yield strength of 1,500 MPa (218 ksi) and a tensile strength of 1,700 MPa (247 ksi) — stronger than 97% of steel grades. Elongation at break is 7% and the elastic modulus is 206 GPa (29.9 Msi).
What is 45SiCrV6-2 used for?
- Coil and leaf springs
- Automotive suspension components
- High-stress fasteners
- Elastic clamping elements
Advantages
- High strength — 1,500 MPa (218 ksi), better than 97% of steel grades
Limitations
- Limited formability — 8/100, worse than 97% of steel grades
- Limited ductility — 7%, worse than 96% of steel grades
- Difficult to machine — 28/100, worse than 91% of steel grades
- Difficult to weld — 15/100, worse than 91% of steel grades
- Low fracture toughness — 50 MPa·√m (45.5 ksi·√in), worse than 86% of steel grades
45SiCrV6-2 properties
Typical room-temperature values for 45SiCrV6-2-+QT; bars are the position among steel grades.
Physical3
45SiCrV6-2 has a density of 7.8 g/cm³ (0.282 lb/in³), lighter than 87% of steel grades. It melts at 1,420°C (2,588 °F).
Mechanical16
45SiCrV6-2 has a yield strength of 1,500 MPa (218 ksi) and a tensile strength of 1,700 MPa (247 ksi) — stronger than 97% of steel grades. Elongation at break is 7% and the elastic modulus is 206 GPa (29.9 Msi).
Thermal6
45SiCrV6-2 is rated for continuous service to 250°C (482 °F). It conducts heat at 42 W/m·K (24.3 BTU/hr·ft·°F), worse than 56% of steel grades. Thermal expansion is 11.5 µm/m·K (6.39 µin/in·°F).
Electrical3
45SiCrV6-2 conducts electricity at 7 % IACS, worse than 74% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of 45SiCrV6-2 takes about 30 MJ of energy and emits 2.1 kg of CO₂ — more than 56% of steel grades. Typical recycled content is 30%.
Manufacturability6
45SiCrV6-2's machinability is poor (28/100, worse than 91% of steel grades); weldability poor (15/100); 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. 45SiCrV6-2 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 45SiCrV6-2
Is 45SiCrV6-2 easy to machine?
Machine only in the +A/+AC condition (≈200–250 HB) with coated carbide; in +QT at ~50 HRC use CBN/ceramic hard-turning or grinding.
Can 45SiCrV6-2 be welded?
Not recommended — high carbon equivalent means quench cracking; if unavoidable, preheat 300–400 °C, low-hydrogen consumables and immediate post-weld temper.
Can 45SiCrV6-2 be formed, bent or molded?
Hot form/coil at 850–950 °C or cold form in the spheroidized state; harden from ~860–880 °C in oil and temper 400–480 °C to the target spring hardness.
45SiCrV6-2 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 | 0.42 – 0.5 | 0.46 |
| Siraises elastic limit and relaxation resistance | 1.3 – 1.6 | 1.45 |
| Mn | 0.5 – 0.8 | 0.65 |
| Cr | 0.5 – 0.8 | 0.65 |
| Vgrain refinement, carbide strengthening | 0.1 – 0.2 | 0.15 |
| P | ≤ 0.03 | |
| S | ≤ 0.03 | |
| Fe | balance |
What surface finishes work on 45SiCrV6-2?
Shot-peen springs after tempering for fatigue life; protect with phosphate + oil, zinc-flake or epoxy paint — avoid acid pickling and electroplating without a 200 °C hydrogen bake.
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 45SiCrV6-2 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- 1.8151
- Similar grades
- 45SiCrV6
How much does 45SiCrV6-2 cost?
45SiCrV6-2 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.
45SiCrV6-2 — frequently asked
What is 45SiCrV6-2 used for?
45SiCrV6-2 is typically used for coil and leaf springs, automotive suspension components, high-stress fasteners and elastic clamping elements. In short: high-fatigue Si-Cr-V spring steel; 1500 MPa yield after Q&T; not for welded assemblies.
What is the yield strength of 45SiCrV6-2?
45SiCrV6-2 has a typical yield strength of 1,500 MPa (218 ksi) and a tensile strength of 1,700 MPa (247 ksi) — stronger than 97% of steel grades. Strength varies by condition: see the 9 listed tempers.
Is 45SiCrV6-2 easy to machine?
Not especially — machinability is rated poor (28/100, worse than 91% of steel grades). Machine only in the +A/+AC condition (≈200–250 HB) with coated carbide; in +QT at ~50 HRC use CBN/ceramic hard-turning or grinding.
Can 45SiCrV6-2 be welded?
Not readily — weldability is rated poor (15/100). Not recommended — high carbon equivalent means quench cracking; if unavoidable, preheat 300–400 °C, low-hydrogen consumables and immediate post-weld temper.
What surface finishes work on 45SiCrV6-2?
Shot-peen springs after tempering for fatigue life; protect with phosphate + oil, zinc-flake or epoxy paint — avoid acid pickling and electroplating without a 200 °C hydrogen bake.
Can 45SiCrV6-2 be formed, bent or molded?
Hot form/coil at 850–950 °C or cold form in the spheroidized state; harden from ~860–880 °C in oil and temper 400–480 °C to the target spring hardness.
What is the maximum service temperature of 45SiCrV6-2?
45SiCrV6-2 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.
What is the difference between 45SiCrV6-2 +QT and 45SiCrV6-2-OT?
+QT is the default condition — standard finished spring condition: oil-quenched from ~870 °C and tempered ~400–480 °C for maximum elastic limit and fatigue life. OT: pre-hardened wire for coiling of valve-quality and suspension springs; only low-temperature stress relief after forming. Yield strength is 1,500 MPa in +QT versus 1,750 MPa in OT.
How much does 45SiCrV6-2 cost?
45SiCrV6-2 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
- EN 10089 — Hot-rolled steels for quenched and tempered springs — CEN (2002)
- EN 10083-1/-3 — Steels for quenching and tempering (delivery conditions +A, +AC, +S, +QT) — CEN (2006)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys (spring steels) — ASM International (1990)
- EN 13906-1 — Cylindrical helical springs, design (E and G values) — CEN (2013)
- European spring-steel bar and wire datasheets (1.8151 / 51CrV4 class) — various mills (2023)
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.