Steel G25NiCrMo3
EN 1.6553
G25NiCrMo3 (EN 1.6553) is a low-alloy Ni-Cr-Mo cast steel with good hardenability, offered in two quenched-and-tempered strength levels as well as normalized and annealed conditions.
Reference datasheet — G25NiCrMo3 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
G25NiCrMo3 tempers and conditions
G25NiCrMo3 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 | Softest condition, used to ease rough machining of complex castings before the final quench-and-temper cycle. | 340 | 570 | 22 | 165 HB | — |
Normalized | Intermediate-strength, low-cost condition for lightly stressed castings or as a stage before final quench and temper. | 420 | 660 | 17 | 13 HRC | — |
+QT1Default Quenched and tempered, lower strength / higher toughness condition | Standard supply condition for general machinery castings needing a balance of ~500 MPa yield with good impact toughness in thick sections. | 550 | 780 | 14 | 21 HRC | — |
Quenched and tempered, higher strength condition | Choose when higher yield strength (~700 MPa) and wear resistance are needed and section thickness/impact demands are moderate. | 720 | 920 | 10 | 28 HRC | — |
What is G25NiCrMo3?
G25NiCrMo3 (EN 1.6553) is a low-alloy Ni-Cr-Mo cast steel with good hardenability, offered in two quenched-and-tempered strength levels as well as normalized and annealed conditions. It is chosen for medium-duty machinery castings that need 550 MPa yield, 780 MPa tensile and 230 HB (21 HRC) through heavier sections, typically gearbox housings and machine frames. Elongation falls to 14 %, machinability is 45 and weldability 45 — preheat and re-tempering are mandatory — and corrosion resistance is low (score 13) with service limited to about 400 °C. G20Mn5 is the cheaper, more weldable choice when strength allows. G25NiCrMo3 has a density of 7.83 g/cm³ (0.283 lb/in³), lighter than 80% of steel grades. It melts at 1,420°C (2,588 °F). G25NiCrMo3 has a yield strength of 550 MPa (79.8 ksi) and a tensile strength of 780 MPa (113 ksi) — stronger than 71% of steel grades. Elongation at break is 14% and the elastic modulus is 210 GPa (30.5 Msi).
What is G25NiCrMo3 used for?
- gearbox housings
- machinery frames
- heavy equipment structural castings
Limitations
- Limited formability — 12/100, worse than 92% of steel grades
- Limited ductility — 14%, worse than 75% of steel grades
G25NiCrMo3 properties
Typical room-temperature values for G25NiCrMo3-+QT1; bars are the position among steel grades.
Physical3
G25NiCrMo3 has a density of 7.83 g/cm³ (0.283 lb/in³), lighter than 80% of steel grades. It melts at 1,420°C (2,588 °F).
Mechanical16
G25NiCrMo3 has a yield strength of 550 MPa (79.8 ksi) and a tensile strength of 780 MPa (113 ksi) — stronger than 71% of steel grades. Elongation at break is 14% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
G25NiCrMo3 is rated for continuous service to 400°C (752 °F). It conducts heat at 42 W/m·K (24.3 BTU/hr·ft·°F), worse than 56% of steel grades. Thermal expansion is 12.3 µm/m·K (6.83 µin/in·°F).
Electrical3
G25NiCrMo3 conducts electricity at 7.8 % IACS, worse than 57% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (13/100), better than 66% of steel grades.
Sustainability4
Producing a kilogram of G25NiCrMo3 takes about 26 MJ of energy and emits 2 kg of CO₂ — less than 64% of steel grades. Typical recycled content is 75%.
Manufacturability8
G25NiCrMo3's machinability is fair (45/100, worse than 65% of steel grades); weldability fair (45/100); formability not recommended (12/100).
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. G25NiCrMo3 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with G25NiCrMo3
Is G25NiCrMo3 easy to machine?
Machine in the annealed or normalized state where possible; at 230–280 HB use rigid setups, coated carbide, moderate speeds and watch for hard skin/sand inclusions on unfettled surfaces.
Can G25NiCrMo3 be welded?
Weldable with low-hydrogen electrodes or MIG matching filler; preheat 200–300 °C depending on section, maintain interpass, and re-temper below the original tempering temperature after welding.
Can G25NiCrMo3 be formed, bent or molded?
Supplied as sand or shell castings — no cold forming; design with generous fillets, uniform sections and adequate risering to avoid shrinkage porosity in the heavier Ni-Cr-Mo sections.
G25NiCrMo3 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 | 0.2 – 0.3 | 0.25 |
| Si | ≤ 0.6 | 0.4 |
| Mn | 0.5 – 0.9 | 0.7 |
| Pmax, foundry practice | ≤ 0.02 | 0.02 |
| Smax, foundry practice | ≤ 0.02 | 0.01 |
| Cr | 0.35 – 0.7 | 0.5 |
| Ni | 0.6 – 1 | 0.8 |
| Mo | 0.15 – 0.3 | 0.22 |
| Fe | balance |
What surface finishes work on G25NiCrMo3?
Not anodizable; protect by shot blasting plus paint, phosphate-and-oil, zinc or nickel plating, or nitriding/induction hardening where local wear resistance is needed.
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 G25NiCrMo3 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- 1.6553
How much does G25NiCrMo3 cost?
G25NiCrMo3 is a standard-cost steel ($$), cheaper than about 71% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
G25NiCrMo3 — frequently asked
What is G25NiCrMo3 used for?
G25NiCrMo3 is typically used for gearbox housings, machinery frames and heavy equipment structural castings. In short: hardenable Ni-Cr-Mo casting; 550 MPa cast yield; needs preheat to weld.
What is the yield strength of G25NiCrMo3?
G25NiCrMo3 has a typical yield strength of 550 MPa (79.8 ksi) and a tensile strength of 780 MPa (113 ksi) — stronger than 71% of steel grades. Strength varies by condition: see the 4 listed tempers.
Is G25NiCrMo3 easy to machine?
Reasonably — machinability is rated fair (45/100, worse than 65% of steel grades). Machine in the annealed or normalized state where possible; at 230–280 HB use rigid setups, coated carbide, moderate speeds and watch for hard skin/sand inclusions on unfettled surfaces.
Can G25NiCrMo3 be welded?
With care — weldability is rated fair (45/100). Weldable with low-hydrogen electrodes or MIG matching filler; preheat 200–300 °C depending on section, maintain interpass, and re-temper below the original tempering temperature after welding.
What surface finishes work on G25NiCrMo3?
Not anodizable; protect by shot blasting plus paint, phosphate-and-oil, zinc or nickel plating, or nitriding/induction hardening where local wear resistance is needed.
Can G25NiCrMo3 be formed, bent or molded?
Supplied as sand or shell castings — no cold forming; design with generous fillets, uniform sections and adequate risering to avoid shrinkage porosity in the heavier Ni-Cr-Mo sections.
What is the maximum service temperature of G25NiCrMo3?
G25NiCrMo3 is rated for continuous use to about 400°C (752 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does G25NiCrMo3 cost?
G25NiCrMo3 is a standard-cost steel ($$), 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 10293 — Steel castings for general engineering uses — CEN (2015)
- EN 10340 — Steel castings for structural uses — CEN (2007)
- EN 10027-2 — Designation systems for steels: numerical system — CEN (2015)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- Steel Castings Handbook, 6th ed. — Steel Founders' Society of America / ASM (1995)
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.