Steel TDSiCrV
TDSiCrV is a vanadium-modified silicon-chromium oil hardened and tempered spring wire to EN 10270-2, used for demanding non-valve springs where fatigue and relaxation resistance matter.
Reference datasheet — TDSiCrV 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 OT-D2.0-4.0 condition
TDSiCrV tempers and conditions
TDSiCrV is supplied in 7 conditions, soft to hard. OT-D2.0-4.0 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 |
|---|---|---|---|---|---|---|
OT, wire dia 10.00–17.00 mm | Largest supplied sections for heavy-duty vehicle and machinery springs; lowest tensile band. | 1,510 | 1,710 | 9 | 50 HRC | 5 % IACS |
OT, wire dia 6.00–10.00 mm | Heavy wire for large compression springs where hardenability limits peak tensile. | 1,600 | 1,810 | 9 | 52 HRC | 5 % IACS |
OT, wire dia 4.00–6.00 mm | Mid-heavy section for suspension, clutch and industrial machinery springs. | 1,700 | 1,920 | 8 | 54 HRC | 5 % IACS |
OT-D2.0-4.0Default OT, wire dia 2.00–4.00 mm | Most commonly stocked diameter band for high-duty compression and torsion springs. | 1,780 | 2,010 | 7 | 55 HRC | 5 % IACS |
Stress relieved | Standard post-coiling condition of a finished spring: restores elastic limit and reduces set/relaxation. | 1,820 | 1,960 | 7 | 54 HRC | 5 % IACS |
Stress relieved + shot peened | Choose for maximum fatigue life in dynamically loaded suspension/clutch springs; compressive surface layer. | 1,820 | 1,960 | 6 | 55 HRC | 5 % IACS |
OT, wire dia 0.50–2.00 mm | Fine wire for small high-stress clutch, brake and mechanism springs; highest tensile band. | 1,880 | 2,120 | 6 | 57 HRC | 5 % IACS |
What is TDSiCrV?
TDSiCrV is a vanadium-modified silicon-chromium oil hardened and tempered spring wire to EN 10270-2, used for demanding non-valve springs where fatigue and relaxation resistance matter. Default oil-tempered properties are about 1780 MPa yield, 2010 MPa tensile, 7 % elongation and 55 HRC, with diameter bands from 0.5 mm to 17 mm and stress-relieved (SR) or shot-peened (SP) deliveries. Service temperature is limited to about 180 °C, and the wire cannot be welded or machined in the delivered condition. TDSiCr is the lower-cost alternative when fatigue duty is less severe. TDSiCrV 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). TDSiCrV has a yield strength of 1,780 MPa (258 ksi) and a tensile strength of 2,010 MPa (292 ksi) — stronger than 99% of steel grades. Elongation at break is 7% and the elastic modulus is 206 GPa (29.9 Msi).
What is TDSiCrV used for?
- mechanical springs
- high-fatigue compression springs
- automotive suspension springs
- general industrial springs
Advantages
- High strength — 1,780 MPa (258 ksi), better than 99% of steel grades
Limitations
- Low fracture toughness — 20 MPa·√m (18.2 ksi·√in), worse than 99% of steel grades
- Difficult to machine — 10/100, worse than 99% of steel grades
- Difficult to weld — 10/100, worse than 99% of steel grades
- Limited service temperature — 180°C (356 °F), worse than 98% of steel grades
- Limited ductility — 7%, worse than 96% of steel grades
TDSiCrV properties
Typical room-temperature values for TDSiCrV-OT-D2.0-4.0; bars are the position among steel grades.
Physical3
TDSiCrV 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).
Mechanical15
TDSiCrV has a yield strength of 1,780 MPa (258 ksi) and a tensile strength of 2,010 MPa (292 ksi) — stronger than 99% of steel grades. Elongation at break is 7% and the elastic modulus is 206 GPa (29.9 Msi).
Thermal6
TDSiCrV is rated for continuous service to 180°C (356 °F). It conducts heat at 33 W/m·K (19.1 BTU/hr·ft·°F), worse than 80% of steel grades. Thermal expansion is 12.3 µm/m·K (6.83 µin/in·°F).
Electrical3
TDSiCrV conducts electricity at 5 % IACS, worse than 82% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of TDSiCrV takes about 33 MJ of energy and emits 2.4 kg of CO₂ — more than 76% of steel grades. Typical recycled content is 20%.
Manufacturability6
TDSiCrV's machinability is not recommended (10/100, worse than 99% of steel grades); weldability not recommended (10/100); formability fair (35/100).
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. TDSiCrV is highlighted; hover a dot for its name, or open the interactive family chart.
Working with TDSiCrV
Is TDSiCrV easy to machine?
Supplied at ~50–58 HRC — essentially not machinable; use abrasive cutoff, grinding or carbide/CBN tooling for end grinding only.
Can TDSiCrV be welded?
Not weldable in service condition: high C+Si gives hard, crack-prone HAZ and destroys the tempered structure; use mechanical ends or hooks formed by coiling.
Can TDSiCrV be formed, bent or molded?
Cold-coil only, with generous spring-back allowance (C/d ≥ 4 recommended); always stress-relieve at ~380–430 °C after coiling, then pre-set and shot peen for dynamic duty.
TDSiCrV 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 – 0.6 | 0.55 |
| Siraises elastic limit and relaxation resistance | 1.2 – 1.6 | 1.4 |
| Mn | 0.5 – 0.9 | 0.7 |
| Cr | 0.5 – 0.8 | 0.65 |
| Vgrain refinement + stable carbides, improves fatigue and temperature stability | 0.1 – 0.2 | 0.15 |
| P | ≤ 0.02 | |
| S | ≤ 0.02 | |
| Cu | ≤ 0.12 | |
| Fe | balance |
What surface finishes work on TDSiCrV?
Phosphate + oil, zinc flake (Dacromet/Geomet) or epoxy coating are preferred; avoid electroplating or bake at 190–220 °C ≥4 h immediately afterwards to prevent hydrogen embrittlement.
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
How much does TDSiCrV cost?
TDSiCrV 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.
TDSiCrV — frequently asked
What is TDSiCrV used for?
TDSiCrV is typically used for mechanical springs, high-fatigue compression springs, automotive suspension springs and general industrial springs. In short: higher fatigue life than TDSiCr; vanadium-modified spring wire; best non-valve OT grade.
What is the yield strength of TDSiCrV?
TDSiCrV has a typical yield strength of 1,780 MPa (258 ksi) and a tensile strength of 2,010 MPa (292 ksi) — stronger than 99% of steel grades. Strength varies by condition: see the 7 listed tempers.
Is TDSiCrV easy to machine?
Not especially — machinability is rated not recommended (10/100, worse than 99% of steel grades). Supplied at ~50–58 HRC — essentially not machinable; use abrasive cutoff, grinding or carbide/CBN tooling for end grinding only.
Can TDSiCrV be welded?
Not readily — weldability is rated not recommended (10/100). Not weldable in service condition: high C+Si gives hard, crack-prone HAZ and destroys the tempered structure; use mechanical ends or hooks formed by coiling.
What surface finishes work on TDSiCrV?
Phosphate + oil, zinc flake (Dacromet/Geomet) or epoxy coating are preferred; avoid electroplating or bake at 190–220 °C ≥4 h immediately afterwards to prevent hydrogen embrittlement.
Can TDSiCrV be formed, bent or molded?
Cold-coil only, with generous spring-back allowance (C/d ≥ 4 recommended); always stress-relieve at ~380–430 °C after coiling, then pre-set and shot peen for dynamic duty.
What is the maximum service temperature of TDSiCrV?
TDSiCrV is rated for continuous use to about 180°C (356 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between TDSiCrV OT-D2.0-4.0 and TDSiCrV-SR?
OT-D2.0-4.0 is the default condition — most commonly stocked diameter band for high-duty compression and torsion springs. SR: standard post-coiling condition of a finished spring: restores elastic limit and reduces set/relaxation. Yield strength is 1,780 MPa in OT-D2.0-4.0 versus 1,820 MPa in SR.
How much does TDSiCrV cost?
TDSiCrV 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 10270-2 Steel wire for mechanical springs — Part 2: Oil hardened and tempered spring steel wire — CEN (2012)
- EN 13906-1 Cylindrical helical springs made from round wire and bar — Compression springs — CEN (2013)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels, and High-Performance Alloys (spring steels) — ASM International (1990)
- Oil tempered Si-Cr-V spring wire datasheets (Garphyttan / Suzuki Garphyttan, Kobe Steel, Nippon Steel) — various producers (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.