Steel 20MnNiCrMo3-2
EN 20MnNiCrMo3-2
20MnNiCrMo3-2 (1.6522, 20CrMnMo) is a case-hardening Mn-Ni-Cr-Mo steel from the EN carburizing family, machined soft and then carburized to give a hard wear surface over a tough low-carbon core.
Reference datasheet — 20MnNiCrMo3-2 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
20MnNiCrMo3-2 tempers and conditions
20MnNiCrMo3-2 is supplied in 8 conditions, soft to hard. +A 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 |
|---|---|---|---|---|---|---|
Spheroidize annealed | Choose for cold extrusion, cold heading and deep upsetting of gear blanks and pinion bodies. | 330 | 520 | 25 | 165 HB | — |
+ADefault Annealed | Standard stock condition for bar and forging stock: softest state for rough machining before carburizing. | 350 | 560 | 22 | 180 HB | — |
Guaranteed hardenability class (Jominy band), supplied soft annealed | Specify when the Jominy end-quench band must be guaranteed so that case/core hardness is reproducible batch to batch on large gears. | 350 | 560 | 22 | 42 HRC | 7.8 % IACS |
Treated for shearability | Coil/bar condition for cold shearing of blanks in high-volume cold-forming lines. | 380 | 600 | 20 | 185 HB | 7.8 % IACS |
Treated to ferrite-pearlite structure with specified hardness range | Pick when consistent chip formation and surface finish on automatic lathes/hobbing machines matter more than minimum hardness. | 390 | 620 | 20 | 175 HB | — |
Normalized | Used on forgings to refine grain and homogenize structure before machining and carburizing. | 430 | 680 | 20 | 14 HRC | 7.8 % IACS |
Heat treated to a specified hardness range | Order when a narrow as-delivered hardness band is needed for stable CNC turning/broaching before carburizing. | 450 | 700 | 18 | 205 HB | — |
Carburized and hardened | Final in-service condition of gears and bearing races: 58–62 HRC case over a tough 30–42 HRC core. | 900 | 1,200 | 10 | 60 HRC | — |
What is 20MnNiCrMo3-2?
20MnNiCrMo3-2 (1.6522, 20CrMnMo) is a case-hardening Mn-Ni-Cr-Mo steel from the EN carburizing family, machined soft and then carburized to give a hard wear surface over a tough low-carbon core. In the annealed or treated-to-hardness condition it provides 350 MPa yield, 560 MPa tensile, 22 % elongation and about 180 HB (88 HRB), and is supplied as bar, tube and forged gear blanks. The case reaches roughly 60 HRC and must be finish-ground, so grinding stock has to be planned into the part; the steel has no corrosion resistance and cannot be welded after carburizing. For lighter-duty carburized parts, 20NiCrMo2-2 (8620) is the nearest alternative. 20MnNiCrMo3-2 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). 20MnNiCrMo3-2 has a yield strength of 350 MPa (50.8 ksi) and a tensile strength of 560 MPa (81.2 ksi) — weaker than 74% of steel grades. Elongation at break is 22% and the elastic modulus is 210 GPa (30.5 Msi).
What is 20MnNiCrMo3-2 used for?
- Carburized gears
- Bearing components
- Transmission shafts
Advantages
- Low embodied carbon — 1.9 kg CO₂/kg, better than 92% of steel grades
- Easy to machine — 62/100, better than 89% of steel grades
20MnNiCrMo3-2 properties
Typical room-temperature values for 20MnNiCrMo3-2-+A; bars are the position among steel grades.
Physical3
20MnNiCrMo3-2 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
20MnNiCrMo3-2 has a yield strength of 350 MPa (50.8 ksi) and a tensile strength of 560 MPa (81.2 ksi) — weaker than 74% of steel grades. Elongation at break is 22% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
20MnNiCrMo3-2 is rated for continuous service to 350°C (662 °F). It conducts heat at 44 W/m·K (25.4 BTU/hr·ft·°F), better than 57% of steel grades. Thermal expansion is 11.5 µm/m·K (6.39 µin/in·°F).
Electrical3
20MnNiCrMo3-2 conducts electricity at 7.8 % IACS, worse than 57% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (10/100), worse than 86% of steel grades.
Sustainability4
Producing a kilogram of 20MnNiCrMo3-2 takes about 25 MJ of energy and emits 1.9 kg of CO₂ — less than 82% of steel grades. Typical recycled content is 30%.
Manufacturability7
20MnNiCrMo3-2's machinability is good (62/100, better than 89% of steel grades); weldability good (55/100); formability good (60/100).
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. 20MnNiCrMo3-2 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 20MnNiCrMo3-2
Is 20MnNiCrMo3-2 easy to machine?
Machine in +A/+FP/+TH at 150–220 HB with coated carbide (Vc ≈ 120–200 m/min); leave 0.1–0.3 mm grinding stock on carburized surfaces since the 60 HRC case must be finish-ground.
Can 20MnNiCrMo3-2 be welded?
Weldable before carburizing with low-hydrogen consumables, 150–250 °C preheat and stress relief; welding on the carburized case is not recommended (high-carbon HAZ cracking).
Can 20MnNiCrMo3-2 be formed, bent or molded?
Best cold-headed/extruded in the +AC spheroidized condition; hot forge at 1100–1180 °C, finish above 900 °C, then normalize or soft anneal before machining.
20MnNiCrMo3-2 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 |
|---|---|---|
| Ccase-hardening carbon level | 0.17 – 0.23 | 0.2 |
| Si | 0.1 – 0.4 | 0.25 |
| Mndesignation digit 3 ⇒ ≈0.75 % | 0.6 – 0.95 | 0.75 |
| P | ≤ 0.03 | |
| Smax; S-modified (+S) versions run 0.020–0.040 | ≤ 0.04 | |
| Crhardenability | 0.35 – 0.7 | 0.5 |
| Nidesignation digit 2 ⇒ ≈0.50 %; gives core toughness | 0.4 – 0.7 | 0.55 |
| Mosuppresses temper embrittlement, deepens hardenability | 0.15 – 0.25 | 0.2 |
| Curesidual max | ≤ 0.3 | |
| Febalance; Chinese cross-reference 20CrMnMo (GB/T 3077) runs higher Mn 0.90–1.20 and Cr 1.10–1.40 — confirm heat analysis before substitution | balance |
What surface finishes work on 20MnNiCrMo3-2?
Carburize 900–930 °C to the required case depth, direct or single quench in oil, temper 160–200 °C; grind, shot-peen for bending fatigue, and protect with oil, manganese phosphate, black oxide or Zn-Ni plating (bake to avoid 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
Equivalent designations
Standards and trade names that resolve to Steel 20MnNiCrMo3-2 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- 1.6522
- Similar grades
- 20CrMnMo
How much does 20MnNiCrMo3-2 cost?
20MnNiCrMo3-2 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.
20MnNiCrMo3-2 — frequently asked
What is 20MnNiCrMo3-2 used for?
20MnNiCrMo3-2 is typically used for carburized gears, bearing components and transmission shafts. In short: deep-hardening carburizing steel; hard case, tough core; heavier sections than 8620.
What is the yield strength of 20MnNiCrMo3-2?
20MnNiCrMo3-2 has a typical yield strength of 350 MPa (50.8 ksi) and a tensile strength of 560 MPa (81.2 ksi) — weaker than 74% of steel grades. Strength varies by condition: see the 8 listed tempers.
Is 20MnNiCrMo3-2 easy to machine?
Reasonably — machinability is rated good (62/100, better than 89% of steel grades). Machine in +A/+FP/+TH at 150–220 HB with coated carbide (Vc ≈ 120–200 m/min); leave 0.1–0.3 mm grinding stock on carburized surfaces since the 60 HRC case must be finish-ground.
Can 20MnNiCrMo3-2 be welded?
Yes — weldability is rated good (55/100). Weldable before carburizing with low-hydrogen consumables, 150–250 °C preheat and stress relief; welding on the carburized case is not recommended (high-carbon HAZ cracking).
What surface finishes work on 20MnNiCrMo3-2?
Carburize 900–930 °C to the required case depth, direct or single quench in oil, temper 160–200 °C; grind, shot-peen for bending fatigue, and protect with oil, manganese phosphate, black oxide or Zn-Ni plating (bake to avoid hydrogen embrittlement).
Can 20MnNiCrMo3-2 be formed, bent or molded?
Best cold-headed/extruded in the +AC spheroidized condition; hot forge at 1100–1180 °C, finish above 900 °C, then normalize or soft anneal before machining.
What is the maximum service temperature of 20MnNiCrMo3-2?
20MnNiCrMo3-2 is rated for continuous use to about 350°C (662 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 20MnNiCrMo3-2 +A and 20MnNiCrMo3-2-CH?
+A is the default condition — standard stock condition for bar and forging stock: softest state for rough machining before carburizing. CH: final in-service condition of gears and bearing races: 58–62 HRC case over a tough 30–42 HRC core. Yield strength is 350 MPa in +A versus 900 MPa in CH.
How much does 20MnNiCrMo3-2 cost?
20MnNiCrMo3-2 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)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- ASM Handbook Vol.4A — Steel Heat Treating Fundamentals and Processes (carburizing) — ASM International (2013)
- Case-hardening steel bar datasheets (Ni-Cr-Mo grades) — European long-products 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.