Steel 50SiCrMo6
EN 50SiCrMo6
50SiCrMo6 (1.8063) is the higher-carbon member of the SiCrMo spring steel group, hardened and tempered for heavy-duty leaf and coil springs.
Reference datasheet — 50SiCrMo6 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
50SiCrMo6 tempers and conditions
50SiCrMo6 is supplied in 7 conditions, soft to hard. +QT 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 |
|---|---|---|---|---|---|---|
Spheroidize annealed | Softest, most ductile delivery state — chosen for cold heading, cold coiling or deep machining of bar/wire. | 450 | 710 | 18 | 210 HB | — |
Annealed | Pick for machining, straightening or cold work before final quench and temper. | 500 | 790 | 15 | 235 HB | 43 W/m·K |
Treated for high shearability | Order when leaf-spring or bar blanks are cold-sheared: microstructure/hardness set to shear cleanly without cracking. | 520 | 800 | 14 | 22 HRC | 8.1 % IACS |
Supplied with specified hardenability | Choose when the spring maker must guarantee through-hardening of thick leaves/bars; delivered hot-rolled or annealed with a Jominy band. | 570 | 950 | 11 | 29 HRC | 7.9 % IACS |
Restricted (narrowed) hardenability band | Same as +H but with a tightened Jominy scatter band for reproducible distortion and hardness in mass-produced springs. | 580 | 950 | 11 | 28 HRC | 8 % IACS |
Hot rolled | Cheapest mill condition for spring makers who hot-form and then quench and temper in-house. | 600 | 1,000 | 10 | 30 HRC | 7.9 % IACS |
+QTDefault Quenched and tempered | Standard service condition for leaf springs, torsion bars and hot-coiled springs — highest elastic limit and fatigue strength. | 1,550 | 1,750 | 7 | 49 HRC | — |
What is 50SiCrMo6?
50SiCrMo6 (1.8063) is the higher-carbon member of the SiCrMo spring steel group, hardened and tempered for heavy-duty leaf and coil springs. Default +QT properties are 1550 MPa yield, 1750 MPa tensile, 7 % elongation and about 49 HRC, with service to 280 °C; usual forms are hot-rolled flats, bar and coiling wire. Weldability (score 15) and formability (score 10) are poor, and after hardening machining is limited to grinding or hard turning, with a machinability score of 25. 46SiCrMo6 is the nearest alternative where higher tempered strength is wanted. 50SiCrMo6 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). 50SiCrMo6 has a yield strength of 1,550 MPa (225 ksi) and a tensile strength of 1,750 MPa (254 ksi) — stronger than 97% of steel grades. Elongation at break is 7% and the elastic modulus is 206 GPa (29.9 Msi).
What is 50SiCrMo6 used for?
- leaf springs
- heavy-duty coil springs
- clutch springs
Advantages
- High strength — 1,550 MPa (225 ksi), better than 97% of steel grades
- Polishes to a fine finish — 65/100, better than 78% of steel grades
Limitations
- Limited ductility — 7%, worse than 96% of steel grades
- Limited formability — 10/100, worse than 95% of steel grades
- Difficult to machine — 25/100, worse than 93% of steel grades
- Difficult to weld — 15/100, worse than 91% of steel grades
- Low fracture toughness — 45 MPa·√m (41 ksi·√in), worse than 90% of steel grades
50SiCrMo6 properties
Typical room-temperature values for 50SiCrMo6-+QT; bars are the position among steel grades.
Physical3
50SiCrMo6 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
50SiCrMo6 has a yield strength of 1,550 MPa (225 ksi) and a tensile strength of 1,750 MPa (254 ksi) — stronger than 97% of steel grades. Elongation at break is 7% and the elastic modulus is 206 GPa (29.9 Msi).
Thermal6
50SiCrMo6 is rated for continuous service to 280°C (536 °F). It conducts heat at 40 W/m·K (23.1 BTU/hr·ft·°F), worse than 64% of steel grades. Thermal expansion is 12.3 µm/m·K (6.83 µin/in·°F).
Electrical3
50SiCrMo6 conducts electricity at 7.8 % IACS, worse than 57% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (11/100), worse than 73% of steel grades.
Sustainability4
Producing a kilogram of 50SiCrMo6 takes about 30 MJ of energy and emits 2.1 kg of CO₂ — more than 56% of steel grades. Typical recycled content is 25%.
Manufacturability6
50SiCrMo6's machinability is poor (25/100, worse than 93% of steel grades); weldability poor (15/100); formability not recommended (10/100).
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. 50SiCrMo6 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 50SiCrMo6
Is 50SiCrMo6 easy to machine?
Machine in +A/+AC condition with carbide tooling and rigid setups; at 46–52 HRC only grinding, hard turning with CBN, or EDM are practical.
Can 50SiCrMo6 be welded?
Not recommended for load-bearing spring joints (C ≈ 0.5 %, high Si/Cr); if unavoidable use 250–350 °C preheat, low-hydrogen consumables and immediate post-weld temper.
Can 50SiCrMo6 be formed, bent or molded?
Hot-form/coil at 850–950 °C then oil quench ~860 °C and temper 400–480 °C to target hardness; cold coiling only from +AC wire followed by full heat treatment.
50SiCrMo6 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 |
|---|---|---|
| Chigher-carbon variant of 45SiCrMo6 | 0.46 – 0.54 | 0.5 |
| Siraises elastic limit and relaxation resistance | 1.2 – 1.5 | 1.35 |
| Mn | 0.5 – 0.9 | 0.7 |
| Cr | 0.6 – 0.9 | 0.75 |
| Mohardenability in thick sections, temper resistance | 0.15 – 0.3 | 0.22 |
| P | ≤ 0.03 | |
| S | ≤ 0.03 | |
| Fe | balance |
What surface finishes work on 50SiCrMo6?
Shot-peen highly stressed surfaces to restore fatigue life, then phosphate + epoxy paint or zinc-flake coating; avoid acid pickling/electroplating without a hydrogen bake-out.
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 50SiCrMo6 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- 1.8063
How much does 50SiCrMo6 cost?
50SiCrMo6 is a budget-cost steel ($), cheaper than about 90% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
50SiCrMo6 — frequently asked
What is 50SiCrMo6 used for?
50SiCrMo6 is typically used for leaf springs, heavy-duty coil springs and clutch springs. In short: heavy-duty leaf spring grade; higher carbon than 46SiCrMo6; grinding-only after hardening.
What is the yield strength of 50SiCrMo6?
50SiCrMo6 has a typical yield strength of 1,550 MPa (225 ksi) and a tensile strength of 1,750 MPa (254 ksi) — stronger than 97% of steel grades. Strength varies by condition: see the 7 listed tempers.
Is 50SiCrMo6 easy to machine?
Not especially — machinability is rated poor (25/100, worse than 93% of steel grades). Machine in +A/+AC condition with carbide tooling and rigid setups; at 46–52 HRC only grinding, hard turning with CBN, or EDM are practical.
Can 50SiCrMo6 be welded?
Not readily — weldability is rated poor (15/100). Not recommended for load-bearing spring joints (C ≈ 0.5 %, high Si/Cr); if unavoidable use 250–350 °C preheat, low-hydrogen consumables and immediate post-weld temper.
What surface finishes work on 50SiCrMo6?
Shot-peen highly stressed surfaces to restore fatigue life, then phosphate + epoxy paint or zinc-flake coating; avoid acid pickling/electroplating without a hydrogen bake-out.
Can 50SiCrMo6 be formed, bent or molded?
Hot-form/coil at 850–950 °C then oil quench ~860 °C and temper 400–480 °C to target hardness; cold coiling only from +AC wire followed by full heat treatment.
What is the maximum service temperature of 50SiCrMo6?
50SiCrMo6 is rated for continuous use to about 280°C (536 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does 50SiCrMo6 cost?
50SiCrMo6 is a budget-cost steel ($), 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 10083-1/-3 — Steels for quenching and tempering (delivery conditions +A, +AC, +S, +QT, +H, +CH) — CEN (2006)
- EN 10027-2 — Numerical designation system (material number 1.8063) — CEN (2015)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys (spring steels) — ASM International (1990)
- ASM Handbook Vol.19 — Fatigue and Fracture (spring steel fatigue data) — ASM International (1996)
- EN 13906-1 — Cylindrical helical springs, design and calculation — CEN (2013)
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.