Steel G30CrMoV6-4
EN 1.7725
G30CrMoV6-4 (1.7725) is a higher-carbon Cr-Mo-V cast steel under EN 10213, quenched and tempered to reach greater strength than the lower-carbon grades in the same family.
Reference datasheet — G30CrMoV6-4 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
G30CrMoV6-4 tempers and conditions
G30CrMoV6-4 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 | Soft intermediate condition used by foundries for rough machining, straightening and repair welding before final quench and temper. | 420 | 700 | 18 | 17 HRC | 7.6 % IACS |
Normalized | Grain-refining treatment for large or complex castings that cannot be liquid quenched; lower strength than +QT conditions. | 560 | 800 | 15 | 23 HRC | 7.4 % IACS |
+QT1Default Quenched and tempered, 850–1000 MPa strength class | Standard supply condition: best balance of 700 MPa+ yield and usable toughness for thick-section pressure and structural castings. | 750 | 920 | 14 | 29 HRC | — |
Quenched and tempered, 1000–1150 MPa strength class | Lower-temperature temper for maximum strength and wear resistance where reduced ductility and impact energy are acceptable. | 900 | 1,070 | 11 | 35 HRC | — |
What is G30CrMoV6-4?
G30CrMoV6-4 (1.7725) is a higher-carbon Cr-Mo-V cast steel under EN 10213, quenched and tempered to reach greater strength than the lower-carbon grades in the same family. In +QT it delivers about 750 MPa yield, 920 MPa tensile, 14 % elongation and 285 HB (29 HRC) with service to roughly 450 °C, and it is also supplied annealed or normalized for machining. The added carbon cuts machinability (40) and weldability (30) — welds need 250–350 °C preheat and PWHT — and corrosion resistance is negligible (13). Where weld repair and creep service matter more than strength, G15CrMoV6-9 is the nearer choice. G30CrMoV6-4 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). G30CrMoV6-4 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 210 GPa (30.5 Msi).
What is G30CrMoV6-4 used for?
- turbine casings
- large valve bodies
- gearbox and housing castings for heavy machinery
- high-strength pressure vessel components
Advantages
- High service temperature — 450°C (842 °F), better than 86% of steel grades
- High strength — 750 MPa (109 ksi), better than 84% of steel grades
Limitations
- Limited formability — 10/100, worse than 95% of steel grades
- Difficult to machine — 40/100, worse than 77% of steel grades
- Limited ductility — 14%, worse than 75% of steel grades
G30CrMoV6-4 properties
Typical room-temperature values for G30CrMoV6-4-+QT1; bars are the position among steel grades.
Physical3
G30CrMoV6-4 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
G30CrMoV6-4 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 210 GPa (30.5 Msi).
Thermal6
G30CrMoV6-4 is rated for continuous service to 450°C (842 °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
G30CrMoV6-4 conducts electricity at 7.2 % IACS, worse than 71% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (13/100), better than 66% of steel grades.
Sustainability4
Producing a kilogram of G30CrMoV6-4 takes about 24 MJ of energy and emits 2 kg of CO₂ — less than 97% of steel grades. Typical recycled content is 75%.
Manufacturability7
G30CrMoV6-4's machinability is fair (40/100, worse than 77% of steel grades); weldability poor (30/100); 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. G30CrMoV6-4 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with G30CrMoV6-4
Is G30CrMoV6-4 easy to machine?
Machine mostly in the annealed/normalized state; in +QT (280–350 HB) use rigid setups, coated carbide, ~80–140 m/min and positive feed to break through the cast skin.
Can G30CrMoV6-4 be welded?
Weldable only with matching low-hydrogen Cr-Mo consumables, 250–350 °C preheat/interpass and 620–680 °C PWHT below the tempering temperature; upgrade/repair welds should precede final Q&T.
Can G30CrMoV6-4 be formed, bent or molded?
Sand or investment cast with generous feeders — steel shrinkage ~2%; avoid abrupt section changes, and always normalize/homogenize before hardening to break down dendritic structure.
G30CrMoV6-4 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 |
|---|---|---|
| Cmedium carbon for high tempered strength | 0.27 – 0.34 | 0.3 |
| Si | 0.2 – 0.6 | 0.4 |
| Mn | 0.6 – 1 | 0.8 |
| P | ≤ 0.02 | |
| S | ≤ 0.02 | |
| Cr | 1.2 – 1.7 | 1.5 |
| Mo | 0.3 – 0.55 | 0.4 |
| Vgrain refinement + secondary hardening | 0.08 – 0.15 | 0.1 |
| Niresidual | ≤ 0.4 | |
| Fe | balance |
What surface finishes work on G30CrMoV6-4?
No inherent corrosion resistance: shot blast, then paint, phosphate, zinc-rich primer, nitride or hard chrome; surface can be induction hardened locally for wear zones.
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 G30CrMoV6-4 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- 1.7725
How much does G30CrMoV6-4 cost?
G30CrMoV6-4 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.
G30CrMoV6-4 — frequently asked
What is G30CrMoV6-4 used for?
G30CrMoV6-4 is typically used for turbine casings, large valve bodies, gearbox and housing castings for heavy machinery and high-strength pressure vessel components. In short: strongest Cr-Mo-V cast grade; 920 MPa tensile in +QT; difficult to weld.
What is the yield strength of G30CrMoV6-4?
G30CrMoV6-4 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 4 listed tempers.
Is G30CrMoV6-4 easy to machine?
Not especially — machinability is rated fair (40/100, worse than 77% of steel grades). Machine mostly in the annealed/normalized state; in +QT (280–350 HB) use rigid setups, coated carbide, ~80–140 m/min and positive feed to break through the cast skin.
Can G30CrMoV6-4 be welded?
Not readily — weldability is rated poor (30/100). Weldable only with matching low-hydrogen Cr-Mo consumables, 250–350 °C preheat/interpass and 620–680 °C PWHT below the tempering temperature; upgrade/repair welds should precede final Q&T.
What surface finishes work on G30CrMoV6-4?
No inherent corrosion resistance: shot blast, then paint, phosphate, zinc-rich primer, nitride or hard chrome; surface can be induction hardened locally for wear zones.
Can G30CrMoV6-4 be formed, bent or molded?
Sand or investment cast with generous feeders — steel shrinkage ~2%; avoid abrupt section changes, and always normalize/homogenize before hardening to break down dendritic structure.
What is the maximum service temperature of G30CrMoV6-4?
G30CrMoV6-4 is rated for continuous use to about 450°C (842 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does G30CrMoV6-4 cost?
G30CrMoV6-4 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 10213 — Steel castings for pressure purposes — CEN (2016)
- 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)
- EN ISO 18265 — Conversion of hardness values — CEN/ISO (2013)
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.