Steel 20CrMoV5-7
EN 20CrMoV5-7
20CrMoV5-7 (1.8503, also 20CrMoVA) is a chromium-molybdenum-vanadium case-hardening and nitriding steel in the EN 10083/10084 family, where the low carbon core is hardened and the surface is enriched by nitriding or carburising.
Reference datasheet — 20CrMoV5-7 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 +QT800 condition
20CrMoV5-7 tempers and conditions
20CrMoV5-7 is supplied in 8 conditions, soft to hard. +QT800 is the default FabDigit quotes; the values on this page are for it.
Compare all 8 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Supply condition for heavy machining, cold forming or before carburising/hardening. | 380 | 640 | 22 | 195 HB | — |
Hot rolled | Cheapest mill condition for parts that will be fully heat treated by the customer. | 450 | 750 | 18 | 21 HRC | 7.8 % IACS |
Normalized | Uniform fine-grained structure for forgings and as a pre-treatment before quench and temper. | 470 | 760 | 19 | 20 HRC | 7.9 % IACS |
Cold drawn | Bright, close-tolerance bar for automatic machining where full Q&T properties are not required. | 660 | 800 | 10 | 22 HRC | 7.8 % IACS |
+QT800Default quenched and tempered, Rm 800–950 MPa | Standard stocked condition: best strength/toughness balance for shafts, gears and elevated-temperature bolting; also the base state before nitriding. | 700 | 880 | 16 | 27 HRC | — |
+QT + gas nitrided | Choose when wear and scuffing resistance plus low distortion are needed; core keeps Q&T strength. | 700 | 880 | 14 | 62 HRC | — |
Carburized and hardened | Use for heavily loaded gear teeth needing a deep, very hard case with a tough low-carbon core. | 800 | 1,100 | 10 | 60 HRC | 7.2 % IACS |
quenched and tempered, Rm 900–1100 MPa (small sections) | Lower tempering temperature for thin sections where higher strength is needed and service temperature stays below ~450 °C. | 830 | 1,000 | 13 | 33 HRC | — |
What is 20CrMoV5-7?
20CrMoV5-7 (1.8503, also 20CrMoVA) is a chromium-molybdenum-vanadium case-hardening and nitriding steel in the EN 10083/10084 family, where the low carbon core is hardened and the surface is enriched by nitriding or carburising. It is chosen for gears and shafts that need a hard, wear-resistant case with tough core, and is supplied as bar and forgings in +A, +N, +QT800, +QT900, +C, NIT, CH and +U conditions; the default Q&T state gives 700 MPa yield, 880 MPa tensile, 16 % elongation and about 270 HB (27 HRC) with service to 500 °C. Machinability is moderate (score 45) and the finished case cannot be economically cut, so all machining precedes heat treatment. 31CrMoV9 is the usual alternative when a thicker nitrided case is wanted. 20CrMoV5-7 has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,425°C (2,597 °F). 20CrMoV5-7 has a yield strength of 700 MPa (102 ksi) and a tensile strength of 880 MPa (128 ksi) — stronger than 81% of steel grades. Elongation at break is 16% and the elastic modulus is 210 GPa (30.5 Msi).
What is 20CrMoV5-7 used for?
- Nitrided gears
- Camshafts
- High-wear shafts
- Valve components
Advantages
- High service temperature — 500°C (932 °F), better than 90% of steel grades
- High strength — 700 MPa (102 ksi), better than 81% of steel grades
20CrMoV5-7 properties
Typical room-temperature values for 20CrMoV5-7-+QT800; bars are the position among steel grades.
Physical3
20CrMoV5-7 has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,425°C (2,597 °F).
Mechanical16
20CrMoV5-7 has a yield strength of 700 MPa (102 ksi) and a tensile strength of 880 MPa (128 ksi) — stronger than 81% of steel grades. Elongation at break is 16% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
20CrMoV5-7 is rated for continuous service to 500°C (932 °F). It conducts heat at 38 W/m·K (22 BTU/hr·ft·°F), worse than 69% of steel grades. Thermal expansion is 12 µm/m·K (6.67 µin/in·°F).
Electrical3
20CrMoV5-7 conducts electricity at 7.8 % IACS, worse than 57% of steel grades.
Chemical & Environmental3
Corrosion resistance is poor (15/100), better than 75% of steel grades.
Sustainability4
Producing a kilogram of 20CrMoV5-7 takes about 31 MJ of energy and emits 2.2 kg of CO₂ — more than 64% of steel grades. Typical recycled content is 30%.
Manufacturability5
20CrMoV5-7's machinability is fair (45/100, worse than 65% of steel grades); weldability fair (40/100); 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. 20CrMoV5-7 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 20CrMoV5-7
Is 20CrMoV5-7 easy to machine?
Rough machine in the annealed state; in Q&T condition use rigid setups, coated carbide at moderate speed and finish-grind after nitriding/carburising since the case is not economically machinable.
Can 20CrMoV5-7 be welded?
Weldable with matching low-alloy Cr-Mo-V consumables using 250–350 °C preheat, controlled interpass and PWHT at 650–700 °C; avoid welding after nitriding.
Can 20CrMoV5-7 be formed, bent or molded?
Hot forge at about 1100→850 °C with slow cooling and subsequent normalising or annealing; cold forming only in the soft-annealed state and only for modest deformation.
20CrMoV5-7 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 |
|---|---|---|
| Ccase-hardening/nitriding carbon level | 0.17 – 0.23 | 0.2 |
| Si | 0.15 – 0.4 | 0.25 |
| Mn | 0.4 – 0.8 | 0.6 |
| P | ≤ 0.03 | |
| S | ≤ 0.02 | |
| Crhardenability + nitride former | 1.2 – 1.5 | 1.35 |
| Motemper embrittlement resistance, creep strength | 0.5 – 0.7 | 0.6 |
| Vgrain refinement, secondary hardening | 0.2 – 0.35 | 0.28 |
| Fe | balance |
What surface finishes work on 20CrMoV5-7?
No anodising (ferrous); protect with phosphating and oil, zinc/nickel plating (bake to avoid hydrogen embrittlement above 1000 MPa), black oxide or paint — nitrided surfaces should be left unplated.
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 20CrMoV5-7 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- 1.8503
- Similar grades
- 20CrMoVA
How much does 20CrMoV5-7 cost?
20CrMoV5-7 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.
20CrMoV5-7 — frequently asked
What is 20CrMoV5-7 used for?
20CrMoV5-7 is typically used for nitrided gears, camshafts, high-wear shafts and valve components. In short: nitriding Cr-Mo-V gear steel; hard case, tough core; usable to 500 °C.
What is the yield strength of 20CrMoV5-7?
20CrMoV5-7 has a typical yield strength of 700 MPa (102 ksi) and a tensile strength of 880 MPa (128 ksi) — stronger than 81% of steel grades. Strength varies by condition: see the 8 listed tempers.
Is 20CrMoV5-7 easy to machine?
Reasonably — machinability is rated fair (45/100, worse than 65% of steel grades). Rough machine in the annealed state; in Q&T condition use rigid setups, coated carbide at moderate speed and finish-grind after nitriding/carburising since the case is not economically machinable.
Can 20CrMoV5-7 be welded?
With care — weldability is rated fair (40/100). Weldable with matching low-alloy Cr-Mo-V consumables using 250–350 °C preheat, controlled interpass and PWHT at 650–700 °C; avoid welding after nitriding.
What surface finishes work on 20CrMoV5-7?
No anodising (ferrous); protect with phosphating and oil, zinc/nickel plating (bake to avoid hydrogen embrittlement above 1000 MPa), black oxide or paint — nitrided surfaces should be left unplated.
Can 20CrMoV5-7 be formed, bent or molded?
Hot forge at about 1100→850 °C with slow cooling and subsequent normalising or annealing; cold forming only in the soft-annealed state and only for modest deformation.
What is the maximum service temperature of 20CrMoV5-7?
20CrMoV5-7 is rated for continuous use to about 500°C (932 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 20CrMoV5-7 +QT800 and 20CrMoV5-7-CH?
+QT800 is the default condition — standard stocked condition: best strength/toughness balance for shafts, gears and elevated-temperature bolting; also the base state before nitriding. CH: use for heavily loaded gear teeth needing a deep, very hard case with a tough low-carbon core. Yield strength is 700 MPa in +QT800 versus 800 MPa in CH.
How much does 20CrMoV5-7 cost?
20CrMoV5-7 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 10085 — Nitriding steels: technical delivery conditions — CEN (2001)
- EN 10269 — Steels and nickel alloys for fasteners with specified elevated and/or low temperature properties — CEN (2013)
- EN 10083-3 — Steels for quenching and tempering: alloy steels — CEN (2006)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- ASM Handbook Vol.4A/4D — Heat Treating of Irons and Steels — ASM International (2013)
- Cr-Mo-V nitriding/case-hardening steel bar datasheets — Böhler / Ovako / Dörrenberg (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.