Steel G20Mn5
EN 1.6220
G20Mn5 (EN 1.6220, cross-referenced to ASTM A216 Gr.
Reference datasheet — G20Mn5 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 +N condition
G20Mn5 tempers and conditions
G20Mn5 is supplied in 4 conditions, soft to hard. +N is the default FabDigit quotes; the values on this page are for it.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Spheroidize annealed | Only for non-critical, low-stress parts or rough blanks that will be heat treated later; coarse dendritic structure gives poor and scattered toughness. | 280 | 520 | 16 | 160 HB | 9 % IACS |
+NDefault Normalized | Standard as-supplied condition for structural and general engineering steel castings; balanced strength, toughness and weldability at lowest cost. | 330 | 560 | 25 | 165 HB | — |
Normalized and tempered | Pick when residual stresses must be reduced and hardness/toughness scatter tightened on heavy or welded castings without full quenching. | 340 | 550 | 26 | 160 HB | — |
Quenched and tempered | Choose for heavier sections or where the highest low-temperature toughness and uniform through-thickness properties are required (wind-turbine and cryogenic-service castings). | 380 | 580 | 26 | 180 HB | — |
What is G20Mn5?
G20Mn5 (EN 1.6220, cross-referenced to ASTM A216 Gr. WCC) is a weldable carbon-manganese cast steel supplied normalized, normalized and tempered or quenched and tempered, and is the workhorse grade for structural and general engineering steel castings. It combines 330 MPa yield, 560 MPa tensile, 25 % elongation and 165 HB (85 HRB) with good toughness in sand, shell or investment castings, up to large wind-energy sizes. Weldability is high (score 82, CEV ≈ 0.42–0.48) and machinability 58, but service is limited to about 400 °C and corrosion resistance is that of plain carbon steel. Move to G25NiCrMo3 when higher strength is needed. G20Mn5 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). G20Mn5 has a yield strength of 330 MPa (47.9 ksi) and a tensile strength of 560 MPa (81.2 ksi) — weaker than 78% of steel grades. Elongation at break is 25% and the elastic modulus is 210 GPa (30.5 Msi).
What is G20Mn5 used for?
- wind turbine hubs and nacelle castings
- construction machinery parts
- railway components
- general structural steel castings
Advantages
- Tough — resists crack growth — 120 MPa·√m (109.2 ksi·√in), better than 81% of steel grades
- Readily welded — 82/100, better than 81% of steel grades
- Conducts heat well — 48 W/m·K (27.7 BTU/hr·ft·°F), better than 79% of steel grades
- Ductile — tolerates forming and impact — 25%, better than 77% of steel grades
Limitations
- Hard to polish — 45/100, worse than 84% of steel grades
- Limited formability — 20/100, worse than 80% of steel grades
- Low strength — 330 MPa (47.9 ksi), worse than 78% of steel grades
G20Mn5 properties
Typical room-temperature values for G20Mn5-+N; bars are the position among steel grades.
Physical3
G20Mn5 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
G20Mn5 has a yield strength of 330 MPa (47.9 ksi) and a tensile strength of 560 MPa (81.2 ksi) — weaker than 78% of steel grades. Elongation at break is 25% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
G20Mn5 is rated for continuous service to 400°C (752 °F). It conducts heat at 48 W/m·K (27.7 BTU/hr·ft·°F), better than 79% of steel grades. Thermal expansion is 12.3 µm/m·K (6.83 µin/in·°F).
Electrical3
G20Mn5 conducts electricity at 9 % IACS, better than 71% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (11/100), worse than 73% of steel grades.
Sustainability4
Producing a kilogram of G20Mn5 takes about 26 MJ of energy and emits 2 kg of CO₂ — less than 64% of steel grades. Typical recycled content is 85%.
Manufacturability8
G20Mn5's machinability is good (58/100, better than 75% of steel grades); weldability very good (82/100); formability poor (20/100).
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. G20Mn5 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with G20Mn5
Is G20Mn5 easy to machine?
Machines like normalized 1020–1030 steel: use coated carbide, 120–200 m/min turning, watch for hard sand/scale skin on the first cut.
Can G20Mn5 be welded?
Excellent weldability (CEV ≈ 0.42–0.48); use low-hydrogen electrodes/wire, preheat 100–150 °C on sections over ~30 mm and PWHT 580–620 °C for critical or heavy repairs.
Can G20Mn5 be formed, bent or molded?
Sand, shell or investment casting with good fluidity but high solidification shrinkage (~2 %); generous risering, chills and directional-solidification design are essential to avoid centerline shrinkage.
G20Mn5 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 | 0.17 – 0.23 | 0.2 |
| Si | ≤ 0.6 | 0.4 |
| Mn | 1 – 1.6 | 1.3 |
| Pmax 0.025 in some grades of EN 10293 | ≤ 0.02 | 0.01 |
| S | ≤ 0.02 | 0.01 |
| Crresidual | ≤ 0.3 | 0.15 |
| Niresidual | ≤ 0.8 | 0.2 |
| Moresidual | ≤ 0.12 | 0.05 |
| Curesidual | ≤ 0.3 | 0.15 |
| Vresidual | ≤ 0.03 | 0.01 |
| Fe | balance |
What surface finishes work on G20Mn5?
No anodizing; shot blast then zinc-rich primer, epoxy paint, hot-dip galvanizing or hard-chrome/nitriding on bearing surfaces for wear.
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 G20Mn5 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- 1.6220
- Similar grades
- A216 Gr. WCC
How much does G20Mn5 cost?
G20Mn5 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.
G20Mn5 — frequently asked
What is G20Mn5 used for?
G20Mn5 is typically used for wind turbine hubs and nacelle castings, construction machinery parts, railway components and general structural steel castings. In short: workhorse structural cast steel; best-weldable cast steel; wind-energy casting standard.
What is the yield strength of G20Mn5?
G20Mn5 has a typical yield strength of 330 MPa (47.9 ksi) and a tensile strength of 560 MPa (81.2 ksi) — weaker than 78% of steel grades. Strength varies by condition: see the 4 listed tempers.
Is G20Mn5 easy to machine?
Reasonably — machinability is rated good (58/100, better than 75% of steel grades). Machines like normalized 1020–1030 steel: use coated carbide, 120–200 m/min turning, watch for hard sand/scale skin on the first cut.
Can G20Mn5 be welded?
Yes — weldability is rated very good (82/100). Excellent weldability (CEV ≈ 0.42–0.48); use low-hydrogen electrodes/wire, preheat 100–150 °C on sections over ~30 mm and PWHT 580–620 °C for critical or heavy repairs.
What surface finishes work on G20Mn5?
No anodizing; shot blast then zinc-rich primer, epoxy paint, hot-dip galvanizing or hard-chrome/nitriding on bearing surfaces for wear.
Can G20Mn5 be formed, bent or molded?
Sand, shell or investment casting with good fluidity but high solidification shrinkage (~2 %); generous risering, chills and directional-solidification design are essential to avoid centerline shrinkage.
What is the maximum service temperature of G20Mn5?
G20Mn5 is rated for continuous use to about 400°C (752 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between G20Mn5 +N and G20Mn5-AC?
+N is the default condition — standard as-supplied condition for structural and general engineering steel castings; balanced strength, toughness and weldability at lowest cost. AC: only for non-critical, low-stress parts or rough blanks that will be heat treated later; coarse dendritic structure gives poor and scattered toughness. Yield strength is 330 MPa in +N versus 280 MPa in AC.
How much does G20Mn5 cost?
G20Mn5 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 10213 — Steel castings for pressure purposes — CEN (2016)
- EN 10293 — Steel castings for general engineering uses — CEN (2015)
- ASTM A216/A216M Grade WCC — ASTM International (2018)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- Steel Castings Handbook — Steel Founders' Society of America / ASM (1995)
- SEW 310 — Physical properties of steels — VDEh (1992)
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.