Steel G10MnMoV6-3 +QT3
Heat-treated state
EN 1.5410
+QT3 = quenched and tempered, strength class 3
Choose for thin- to medium-section castings needing the highest proof stress; toughness and machinability drop accordingly.
Values for the +QT3 condition
Other G10MnMoV6-3 tempers and conditions
G10MnMoV6-3 is listed in 5 conditions; see the grade overview at G10MnMoV6-3.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Softest condition, used for heavy rough machining or weld repair of castings before final heat treatment. | 310 | 500 | 25 | 150 HB | 7.8 % IACS |
Normalized | Intermediate/rough-machining condition or for lightly loaded castings before final quench-and-temper. | 370 | 560 | 22 | 165 HB | 7.7 % IACS |
Quenched and tempered, strength class 1 | Choose for thick-walled pressure castings where maximum toughness and weldability matter more than strength. | 460 | 610 | 20 | 11 HRC | — |
+QT2Default Quenched and tempered, strength class 2 | The standard balance of strength, ductility and impact toughness for valve bodies and pressure-vessel castings. | 540 | 690 | 18 | 16 HRC | — |
+QT3This page Quenched and tempered, strength class 3 | Choose for thin- to medium-section castings needing the highest proof stress; toughness and machinability drop accordingly. | 620 | 770 | 15 | 22 HRC | — |
What is G10MnMoV6-3 +QT3?
G10MnMoV6-3 +QT3 is G10MnMoV6-3 heat treated to +QT3 — choose for thin- to medium-section castings needing the highest proof stress; toughness and machinability drop accordingly. G10MnMoV6-3 +QT3 has a yield strength of 620 MPa (89.9 ksi) and a tensile strength of 770 MPa (112 ksi) — stronger than 78% of steel grades. Elongation at break is 15% and the elastic modulus is 210 GPa (30.5 Msi). G10MnMoV6-3 +QT3 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). +QT2 is the default condition FabDigit quotes; +QT3 is available on request or by drawing note.
Advantages
- High strength — 620 MPa (89.9 ksi), better than 78% of steel grades
Limitations
- Limited formability — 15/100, worse than 87% of steel grades
G10MnMoV6-3 +QT3 properties
Typical room-temperature values for G10MnMoV6-3 +QT3; 17 are specific to this condition. Other listed values are G10MnMoV6-3 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
G10MnMoV6-3 +QT3 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
G10MnMoV6-3 +QT3 has a yield strength of 620 MPa (89.9 ksi) and a tensile strength of 770 MPa (112 ksi) — stronger than 78% of steel grades. Elongation at break is 15% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
G10MnMoV6-3 +QT3 is rated for continuous service to 380°C (716 °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
G10MnMoV6-3 +QT3 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 G10MnMoV6-3 +QT3 takes about 26 MJ of energy and emits 2 kg of CO₂ — less than 64% of steel grades. Typical recycled content is 80%.
Manufacturability7
G10MnMoV6-3 +QT3's machinability is fair (48/100, worse than 57% of steel grades); weldability good (66/100); formability poor (15/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with G10MnMoV6-3 +QT3
Is G10MnMoV6-3 easy to machine?
Machines like Q&T 4130-class steel — carbide inserts, moderate speeds, rigid setup; expect abrasive skin and sand inclusions on unblasted cast surfaces.
Can G10MnMoV6-3 be welded?
Good weldability at ~0.10 %C (CE ≈ 0.45): low-hydrogen electrodes, preheat 100–200 °C for heavy sections and post-weld tempering/PWHT for pressure parts.
Can G10MnMoV6-3 be formed, bent or molded?
Supplied as sand/investment castings; design generous fillets and directional solidification, feed heavy sections with risers to avoid shrinkage porosity.
What surface finishes work on G10MnMoV6-3?
No natural corrosion resistance — shot blast then paint, zinc/epoxy coat or electroless nickel; machined sealing faces can be nitrided or hard-chromed.
G10MnMoV6-3 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 |
|---|---|---|
| Clow carbon for weldability | 0.07 – 0.13 | 0.1 |
| Si | 0.2 – 0.6 | 0.4 |
| Mn | 1.2 – 1.7 | 1.5 |
| P | ≤ 0.02 | 0.01 |
| S | ≤ 0.02 | 0.01 |
| Mo | 0.2 – 0.4 | 0.3 |
| Vmicroalloy, grain refinement + creep strength | 0.05 – 0.12 | 0.08 |
| Crresidual | ≤ 0.3 | 0.15 |
| Niresidual | ≤ 0.4 | 0.2 |
| Curesidual | ≤ 0.3 | 0.15 |
| Fe | balance | — |
G10MnMoV6-3 +QT3 — frequently asked
What is G10MnMoV6-3 +QT3 used for?
G10MnMoV6-3 +QT3 is typically used for pressure vessel castings, valve bodies and pump casings. In short: weldable pressure-part casting; mn-Mo-V strength to 400 °C; easier to weld than GS-42CrMo4.
What is the yield strength of G10MnMoV6-3 +QT3?
G10MnMoV6-3 +QT3 has a typical yield strength of 620 MPa (89.9 ksi) and a tensile strength of 770 MPa (112 ksi) — stronger than 78% of steel grades. Strength varies by condition: see the 5 listed tempers.
Is G10MnMoV6-3 +QT3 easy to machine?
Reasonably — machinability is rated fair (48/100, worse than 57% of steel grades). Machines like Q&T 4130-class steel — carbide inserts, moderate speeds, rigid setup; expect abrasive skin and sand inclusions on unblasted cast surfaces.
Can G10MnMoV6-3 +QT3 be welded?
Yes — weldability is rated good (66/100). Good weldability at ~0.10 %C (CE ≈ 0.45): low-hydrogen electrodes, preheat 100–200 °C for heavy sections and post-weld tempering/PWHT for pressure parts.
What surface finishes work on G10MnMoV6-3 +QT3?
No natural corrosion resistance — shot blast then paint, zinc/epoxy coat or electroless nickel; machined sealing faces can be nitrided or hard-chromed.
Can G10MnMoV6-3 +QT3 be formed, bent or molded?
Supplied as sand/investment castings; design generous fillets and directional solidification, feed heavy sections with risers to avoid shrinkage porosity.
What is the maximum service temperature of G10MnMoV6-3 +QT3?
G10MnMoV6-3 +QT3 is rated for continuous use to about 380°C (716 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- EN 10213 — Steel castings for pressure purposes — CEN (2016)
- EN 10293 — Steel castings for general engineering uses — CEN (2015)
- EN 10027-2 — Designation systems for steels: material numbers — CEN (2015)
- ASM Handbook Vol.1: Properties and Selection — Irons, Steels and High-Performance Alloys — ASM International (1990)
- Steel Castings Handbook, 6th ed. — SFSA / ASM International (1995)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.