Steel 20MnCrMo4-2
EN 20MnCrMo4-2
20MnCrMo4-2 (1.3570) is a manganese-chromium-molybdenum case-hardening steel of the EN 10084 family, alloyed for greater hardenability than 20CrMo4 in heavier sections.
Reference datasheet — 20MnCrMo4-2 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 +A condition
20MnCrMo4-2 tempers and conditions
20MnCrMo4-2 is supplied in 6 conditions, soft to hard. +A is the default FabDigit quotes; the values on this page are for it.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Spheroidize annealed | Spheroidized carbide structure for maximum cold formability — cold extrusion, cold heading of gear blanks and pinions. | 350 | 560 | 24 | 170 HB | 8.5 % IACS |
Treated for high shearability | Softest-for-shearing delivery condition for bar that will be cold sheared to blanks or cold headed before carburizing. | 370 | 580 | 22 | 175 HB | 8 % IACS |
+ADefault Annealed | Standard soft-annealed stock condition for general machining before carburizing. | 400 | 620 | 20 | 195 HB | — |
Treated to ferrite-pearlite structure with specified hardness range | Choose when a uniform ferrite/pearlite microstructure and a narrow hardness band are needed for consistent high-speed machining and reproducible distortion. | 420 | 640 | 19 | 190 HB | 8 % IACS |
Heat treated to a specified hardness range | Supplied inside a contracted hardness band (typically ~170–217 HB) when tool life and machine loading must be predictable across lots. | 430 | 660 | 18 | 200 HB | 8 % IACS |
Hardenability-guaranteed (Jominy band); properties after carburize,… | Order +H when the Jominy hardenability band must be certified; the listed values are the finished case-hardened part (case 58–62 HRC, tempered ~180 °C, core ~11 mm section). | 950 | 1,250 | 9 | 60 HRC | — |
What is 20MnCrMo4-2?
20MnCrMo4-2 (1.3570) is a manganese-chromium-molybdenum case-hardening steel of the EN 10084 family, alloyed for greater hardenability than 20CrMo4 in heavier sections. It is supplied as bar and forging stock in annealed, ferrite-pearlite, treated-for-machining and spheroidized conditions, machined soft at 400 MPa yield, 620 MPa tensile, 20% elongation and 195 HB, then carburized and ground. Weldability is limited (score 40, CEV ≈0.6–0.7) and the steel has no corrosion resistance. Where core toughness matters more than alloy cost, 20NiCrMo7 is the nearest alternative. 20MnCrMo4-2 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). 20MnCrMo4-2 has a yield strength of 400 MPa (58 ksi) and a tensile strength of 620 MPa (89.9 ksi) — weaker than 60% of steel grades. Elongation at break is 20% and the elastic modulus is 210 GPa (30.5 Msi).
What is 20MnCrMo4-2 used for?
- gears
- bearing rings
- heavy-duty shafts
Limitations
- Limited service temperature — 200°C (392 °F), worse than 93% of steel grades
20MnCrMo4-2 properties
Typical room-temperature values for 20MnCrMo4-2-+A; bars are the position among steel grades.
Physical3
20MnCrMo4-2 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).
Mechanical16
20MnCrMo4-2 has a yield strength of 400 MPa (58 ksi) and a tensile strength of 620 MPa (89.9 ksi) — weaker than 60% of steel grades. Elongation at break is 20% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
20MnCrMo4-2 is rated for continuous service to 200°C (392 °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
20MnCrMo4-2 conducts electricity at 8 % IACS, better than 55% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of 20MnCrMo4-2 takes about 29 MJ of energy and emits 2.1 kg of CO₂ — less than 53% of steel grades. Typical recycled content is 25%.
Manufacturability8
20MnCrMo4-2's machinability is good (55/100, better than 62% of steel grades); weldability fair (40/100); formability fair (50/100).
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. 20MnCrMo4-2 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 20MnCrMo4-2
Is 20MnCrMo4-2 easy to machine?
Machine fully in the soft (+A/+FP/+TH) condition with coated carbide at ~120–180 m/min; leave 0.1–0.3 mm grinding stock on gear/bearing surfaces, since after carburizing only grinding or hard turning with CBN is practical.
Can 20MnCrMo4-2 be welded?
Weldable only with care — CEV ≈ 0.6–0.7 means 200–300 °C preheat, low-hydrogen consumables and prompt stress relief; never weld carburized surfaces.
Can 20MnCrMo4-2 be formed, bent or molded?
Cold heading and extrusion are done in the +AC (spheroidized) or +S condition; hot forging 1100–1150 °C with slow cooling or immediate isothermal anneal to avoid bainite in heavy sections.
20MnCrMo4-2 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 |
|---|---|---|
| CEN 10084; GB 20CrMnMo 0.17–0.23 | 0.17 – 0.22 | 0.2 |
| SiGB grade specifies 0.17–0.37 | ≤ 0.4 | 0.25 |
| Mn | 0.9 – 1.2 | 1.05 |
| P | ≤ 0.03 | 0.02 |
| Slower S (≤0.010) for +S/controlled-sulphur variants | ≤ 0.04 | 0.02 |
| CrGB 20CrMnMo 1.10–1.40 | 0.9 – 1.2 | 1.05 |
| Mo | 0.2 – 0.3 | 0.25 |
| Niresidual | ≤ 0.3 | |
| Curesidual | ≤ 0.3 | |
| Fe | balance |
What surface finishes work on 20MnCrMo4-2?
Not anodizable; typical finishes are Mn/Zn phosphate, black oxide, oil, or zinc/zinc-nickel plating — bake after plating to avoid hydrogen embrittlement in the hardened case.
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 20MnCrMo4-2 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- 1.3570
- Similar grades
- 20CrMnMo
How much does 20MnCrMo4-2 cost?
20MnCrMo4-2 is a budget-cost steel ($), cheaper than about 90% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
20MnCrMo4-2 — frequently asked
What is 20MnCrMo4-2 used for?
20MnCrMo4-2 is typically used for gears, bearing rings and heavy-duty shafts. In short: deeper hardening than 20CrMo4; heavy-section gear steel; limited weldability.
What is the yield strength of 20MnCrMo4-2?
20MnCrMo4-2 has a typical yield strength of 400 MPa (58 ksi) and a tensile strength of 620 MPa (89.9 ksi) — weaker than 60% of steel grades. Strength varies by condition: see the 6 listed tempers.
Is 20MnCrMo4-2 easy to machine?
Reasonably — machinability is rated good (55/100, better than 62% of steel grades). Machine fully in the soft (+A/+FP/+TH) condition with coated carbide at ~120–180 m/min; leave 0.1–0.3 mm grinding stock on gear/bearing surfaces, since after carburizing only grinding or hard turning with CBN is practical.
Can 20MnCrMo4-2 be welded?
With care — weldability is rated fair (40/100). Weldable only with care — CEV ≈ 0.6–0.7 means 200–300 °C preheat, low-hydrogen consumables and prompt stress relief; never weld carburized surfaces.
What surface finishes work on 20MnCrMo4-2?
Not anodizable; typical finishes are Mn/Zn phosphate, black oxide, oil, or zinc/zinc-nickel plating — bake after plating to avoid hydrogen embrittlement in the hardened case.
Can 20MnCrMo4-2 be formed, bent or molded?
Cold heading and extrusion are done in the +AC (spheroidized) or +S condition; hot forging 1100–1150 °C with slow cooling or immediate isothermal anneal to avoid bainite in heavy sections.
What is the maximum service temperature of 20MnCrMo4-2?
20MnCrMo4-2 is rated for continuous use to about 200°C (392 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does 20MnCrMo4-2 cost?
20MnCrMo4-2 is a budget-cost steel ($), 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 10084 — Case hardening steels: technical delivery conditions — CEN (2008)
- GB/T 3077 — Alloy structural steels (20CrMnMo) — SAC (2015)
- Stahlschlüssel (Key to Steel) — Verlag Stahlschlüssel Wegst (2019)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- ASM Handbook Vol.4 — Heat Treating (carburizing of alloy steels) — ASM International (1991)
- 20CrMnMo — Mysteel / 1688 (2026)
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.