Steel G30NiCrMo14
EN 1.6771
G30NiCrMo14 (1.6771) is a high-nickel Ni-Cr-Mo cast alloy steel supplied annealed (+A) or quenched and tempered (+QT1, +QT2).
Reference datasheet — G30NiCrMo14 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
G30NiCrMo14 tempers and conditions
G30NiCrMo14 is supplied in 3 conditions, soft to hard. +QT1 is the default FabDigit quotes; the values on this page are for it.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Pick for rough machining or straightening before the final quench-and-temper cycle. | 450 | 700 | 18 | 17 HRC | — |
+QT1Default Quenched and tempered, lower strength class | Standard delivery condition for thick-section, highly stressed castings where toughness is prioritised over peak strength. | 750 | 920 | 14 | 28 HRC | — |
Quenched and tempered, higher strength class | Pick when maximum strength/weight is needed in moderate wall thickness and slightly lower impact energy is acceptable. | 860 | 1,020 | 12 | 33 HRC | — |
What is G30NiCrMo14?
G30NiCrMo14 (1.6771) is a high-nickel Ni-Cr-Mo cast alloy steel supplied annealed (+A) or quenched and tempered (+QT1, +QT2). The high nickel content gives strength with toughness in large sections: the default condition provides 750 MPa yield, 920 MPa tensile, 14 % elongation and 275 HB (28 HRC), with service to 350 °C. Machinability (38) and weldability (32) are low, the carbon equivalent is high, and the alloy has no natural corrosion resistance, so coatings are required. G25NiCrMo6 is the lower-alloy alternative where full strength is not needed. G30NiCrMo14 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). G30NiCrMo14 has a yield strength of 750 MPa (109 ksi) and a tensile strength of 920 MPa (133 ksi) — stronger than 84% of steel grades. Elongation at break is 14% and the elastic modulus is 208 GPa (30.2 Msi).
What is G30NiCrMo14 used for?
- large forged/cast machinery components
- heavy equipment structural castings
- high-strength load-bearing parts
Advantages
- High strength — 750 MPa (109 ksi), better than 84% of steel grades
Limitations
- Limited formability — 10/100, worse than 95% of steel grades
- High embodied carbon — 2.5 kg CO₂/kg, worse than 82% of steel grades
- Low electrical conductivity — 5.7 % IACS, worse than 80% of steel grades
- Difficult to machine — 38/100, worse than 80% of steel grades
- Poor heat conductor — 34 W/m·K (19.6 BTU/hr·ft·°F), worse than 77% of steel grades
G30NiCrMo14 properties
Typical room-temperature values for G30NiCrMo14-+QT1; bars are the position among steel grades.
Physical3
G30NiCrMo14 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
G30NiCrMo14 has a yield strength of 750 MPa (109 ksi) and a tensile strength of 920 MPa (133 ksi) — stronger than 84% of steel grades. Elongation at break is 14% and the elastic modulus is 208 GPa (30.2 Msi).
Thermal6
G30NiCrMo14 is rated for continuous service to 350°C (662 °F). It conducts heat at 34 W/m·K (19.6 BTU/hr·ft·°F), worse than 77% of steel grades. Thermal expansion is 12.3 µm/m·K (6.83 µin/in·°F).
Electrical3
G30NiCrMo14 conducts electricity at 5.7 % IACS, worse than 80% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (13/100), better than 66% of steel grades.
Sustainability4
Producing a kilogram of G30NiCrMo14 takes about 32 MJ of energy and emits 2.5 kg of CO₂ — more than 70% of steel grades. Typical recycled content is 75%.
Manufacturability7
G30NiCrMo14's machinability is fair (38/100, worse than 80% of steel grades); weldability poor (32/100); formability not recommended (10/100).
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. G30NiCrMo14 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with G30NiCrMo14
Is G30NiCrMo14 easy to machine?
Rough machine in the annealed condition; in +QT1/+QT2 use rigid setups, coated carbide at 60–110 m/min with positive feed to cut under the work-hardened skin, and remove the sand-cast scale first.
Can G30NiCrMo14 be welded?
High carbon equivalent — use low-hydrogen matching or 2.5–3.5%Ni consumables, preheat 200–300 °C, maintain interpass, and stress-relieve/re-temper 30–50 °C below the original tempering temperature.
Can G30NiCrMo14 be formed, bent or molded?
Casting grade only: design generous risers and directional solidification, control section transitions to avoid hot tears, and normalise before the quench-and-temper cycle to refine coarse as-cast grain.
G30NiCrMo14 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 | 0.26 – 0.34 | 0.3 |
| Si | ≤ 0.6 | 0.4 |
| Mn | 0.5 – 0.8 | 0.65 |
| P | ≤ 0.02 | |
| S | ≤ 0.02 | |
| Cr | 1.2 – 1.5 | 1.35 |
| Mo | 0.25 – 0.55 | 0.4 |
| Nihigh Ni gives deep hardenability and low-temperature toughness | 3.2 – 3.8 | 3.5 |
| Vresidual/optional | ≤ 0.1 | |
| Fe | balance |
What surface finishes work on G30NiCrMo14?
No natural corrosion resistance — shot-blast then paint, zinc-rich primer, phosphate or hard-chrome/nickel plate; nitriding or induction hardening can be applied to running surfaces.
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 G30NiCrMo14 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- 1.6771
How much does G30NiCrMo14 cost?
G30NiCrMo14 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.
G30NiCrMo14 — frequently asked
What is G30NiCrMo14 used for?
G30NiCrMo14 is typically used for large forged/cast machinery components, heavy equipment structural castings and high-strength load-bearing parts. In short: high-nickel cast Ni-Cr-Mo; toughness in heavy sections; needs preheat to weld.
What is the yield strength of G30NiCrMo14?
G30NiCrMo14 has a typical yield strength of 750 MPa (109 ksi) and a tensile strength of 920 MPa (133 ksi) — stronger than 84% of steel grades. Strength varies by condition: see the 3 listed tempers.
Is G30NiCrMo14 easy to machine?
Not especially — machinability is rated fair (38/100, worse than 80% of steel grades). Rough machine in the annealed condition; in +QT1/+QT2 use rigid setups, coated carbide at 60–110 m/min with positive feed to cut under the work-hardened skin, and remove the sand-cast scale first.
Can G30NiCrMo14 be welded?
Not readily — weldability is rated poor (32/100). High carbon equivalent — use low-hydrogen matching or 2.5–3.5%Ni consumables, preheat 200–300 °C, maintain interpass, and stress-relieve/re-temper 30–50 °C below the original tempering temperature.
What surface finishes work on G30NiCrMo14?
No natural corrosion resistance — shot-blast then paint, zinc-rich primer, phosphate or hard-chrome/nickel plate; nitriding or induction hardening can be applied to running surfaces.
Can G30NiCrMo14 be formed, bent or molded?
Casting grade only: design generous risers and directional solidification, control section transitions to avoid hot tears, and normalise before the quench-and-temper cycle to refine coarse as-cast grain.
What is the maximum service temperature of G30NiCrMo14?
G30NiCrMo14 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 G30NiCrMo14 cost?
G30NiCrMo14 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
- DIN 17205 — Quenched and tempered steel castings for general purposes (GS-30NiCrMo14, 1.6771) — DIN (1992)
- EN 10340 — Steel castings for structural uses — CEN (2007)
- ISO 18265 — Metallic materials: conversion of hardness values — ISO (2013)
- 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.