Steel G32NiCrMo8-5-4
EN 1.6570
G32NiCrMo8-5-4 (1.6570) is a high-strength Ni-Cr-Mo cast alloy steel supplied annealed (+A) or in three quench-and-temper conditions (+QT1 to +QT3).
Reference datasheet — G32NiCrMo8-5-4 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 +QT1 condition
G32NiCrMo8-5-4 tempers and conditions
G32NiCrMo8-5-4 is supplied in 4 conditions, soft to hard. +QT1 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 |
|---|---|---|---|---|---|---|
Annealed | Supply condition for rough machining of heavy castings before final quench and temper. | 420 | 700 | 18 | 210 HB | — |
+QT1Default Quenched and tempered, lower strength class | Standard stocked condition: best strength/toughness balance for heavy gear housings, planet carriers and crane parts. | 880 | 1,020 | 12 | 33 HRC | — |
Quenched and tempered, higher strength class | Choose when maximum static strength is required and section sizes / notch severity are moderate; tempered lower, so impact energy drops. | 1,020 | 1,180 | 9 | 39 HRC | — |
Quenched and low-tempered, maximum hardness class | Non-standard foundry option for wear-loaded parts needing ~42–46 HRC; toughness and weldability are marginal. | 1,150 | 1,350 | 7 | 43 HRC | — |
What is G32NiCrMo8-5-4?
G32NiCrMo8-5-4 (1.6570) is a high-strength Ni-Cr-Mo cast alloy steel supplied annealed (+A) or in three quench-and-temper conditions (+QT1 to +QT3). Engineers use it for heavily loaded castings that need tensile strength with retained toughness: the default condition reaches 880 MPa yield, 1020 MPa tensile, 12 % elongation and 310 HB (33 HRC), usable to 350 °C. Trade-offs are poor machinability (score 32), low weldability (score 30) due to a high carbon equivalent, and negligible corrosion resistance (score 12), so protective coatings are mandatory. Where welding is frequent, G25NiCrMo6 is easier to fabricate. G32NiCrMo8-5-4 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). G32NiCrMo8-5-4 has a yield strength of 880 MPa (128 ksi) and a tensile strength of 1,020 MPa (148 ksi) — stronger than 89% of steel grades. Elongation at break is 12% and the elastic modulus is 210 GPa (30.5 Msi).
What is G32NiCrMo8-5-4 used for?
- large gearbox and press components
- heavy-duty machine castings
- high-strength structural castings
Advantages
- High strength — 880 MPa (128 ksi), better than 89% of steel grades
- Polishes to a fine finish — 65/100, better than 78% of steel grades
Limitations
- Limited formability — 8/100, worse than 97% of steel grades
- Difficult to machine — 32/100, worse than 87% of steel grades
- Limited ductility — 12%, worse than 84% of steel grades
G32NiCrMo8-5-4 properties
Typical room-temperature values for G32NiCrMo8-5-4-+QT1; bars are the position among steel grades.
Physical3
G32NiCrMo8-5-4 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
G32NiCrMo8-5-4 has a yield strength of 880 MPa (128 ksi) and a tensile strength of 1,020 MPa (148 ksi) — stronger than 89% of steel grades. Elongation at break is 12% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
G32NiCrMo8-5-4 is rated for continuous service to 350°C (662 °F). It conducts heat at 38 W/m·K (22 BTU/hr·ft·°F), worse than 69% of steel grades. Thermal expansion is 12.3 µm/m·K (6.83 µin/in·°F).
Electrical3
G32NiCrMo8-5-4 conducts electricity at 7.5 % IACS, worse than 67% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of G32NiCrMo8-5-4 takes about 26 MJ of energy and emits 2.1 kg of CO₂ — less than 64% of steel grades. Typical recycled content is 65%.
Manufacturability8
G32NiCrMo8-5-4's machinability is poor (32/100, worse than 87% of steel grades); weldability poor (30/100); formability not recommended (8/100).
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. G32NiCrMo8-5-4 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with G32NiCrMo8-5-4
Is G32NiCrMo8-5-4 easy to machine?
Rough machine in the annealed condition; finish after Q&T with rigid setups, coated carbide, low feed-per-tooth and 60–120 m/min at 30–36 HRC.
Can G32NiCrMo8-5-4 be welded?
High carbon equivalent — use low-hydrogen consumables, 200–300 °C preheat/interpass and stress relief or full re-temper below the tempering temperature; repair welds must be procedure-qualified.
Can G32NiCrMo8-5-4 be formed, bent or molded?
Sand or investment cast only; design generous radii and directional feeding since the alloy has a wide freezing range and is hot-tear sensitive.
G32NiCrMo8-5-4 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 | 0.3 – 0.35 | 0.32 |
| Si | ≤ 0.6 | 0.4 |
| Mn | 0.6 – 0.9 | 0.75 |
| P | ≤ 0.02 | |
| S | ≤ 0.02 | |
| Cr | 1.1 – 1.4 | 1.25 |
| Ni | 1.8 – 2.2 | 2 |
| Mo | 0.3 – 0.5 | 0.4 |
| Vresidual | ≤ 0.1 | |
| Fe | balance |
What surface finishes work on G32NiCrMo8-5-4?
No anodizing; protect with phosphate+paint, zinc-rich primer, black oxide or hard chrome — avoid electroplating without hydrogen-embrittlement bake at high hardness.
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 G32NiCrMo8-5-4 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- 1.6570
How much does G32NiCrMo8-5-4 cost?
G32NiCrMo8-5-4 is a premium-cost steel ($$$), cheaper than about 51% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
G32NiCrMo8-5-4 — frequently asked
What is G32NiCrMo8-5-4 used for?
G32NiCrMo8-5-4 is typically used for large gearbox and press components, heavy-duty machine castings and high-strength structural castings. In short: highest strength cast Ni-Cr-Mo; 1020 MPa in Q&T; difficult to weld.
What is the yield strength of G32NiCrMo8-5-4?
G32NiCrMo8-5-4 has a typical yield strength of 880 MPa (128 ksi) and a tensile strength of 1,020 MPa (148 ksi) — stronger than 89% of steel grades. Strength varies by condition: see the 4 listed tempers.
Is G32NiCrMo8-5-4 easy to machine?
Not especially — machinability is rated poor (32/100, worse than 87% of steel grades). Rough machine in the annealed condition; finish after Q&T with rigid setups, coated carbide, low feed-per-tooth and 60–120 m/min at 30–36 HRC.
Can G32NiCrMo8-5-4 be welded?
Not readily — weldability is rated poor (30/100). High carbon equivalent — use low-hydrogen consumables, 200–300 °C preheat/interpass and stress relief or full re-temper below the tempering temperature; repair welds must be procedure-qualified.
What surface finishes work on G32NiCrMo8-5-4?
No anodizing; protect with phosphate+paint, zinc-rich primer, black oxide or hard chrome — avoid electroplating without hydrogen-embrittlement bake at high hardness.
Can G32NiCrMo8-5-4 be formed, bent or molded?
Sand or investment cast only; design generous radii and directional feeding since the alloy has a wide freezing range and is hot-tear sensitive.
What is the maximum service temperature of G32NiCrMo8-5-4?
G32NiCrMo8-5-4 is rated for continuous use to about 350°C (662 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does G32NiCrMo8-5-4 cost?
G32NiCrMo8-5-4 is a premium-cost steel ($$$), cheaper than about 51% 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 10293 — Steel castings for general engineering uses — CEN (2015)
- EN 10340 — Steel castings for structural uses — CEN (2007)
- ASM Handbook Vol.1: Properties and Selection — Irons, Steels and High-Performance Alloys — ASM International (1990)
- ASM Handbook Vol.15: Casting — ASM International (2008)
- ASTM A370 — Hardness/strength conversion tables — ASTM (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.