Steel G12MoCrV5-2 +A (Annealed)
Heat-treated state
EN 1.7720
Interim condition for heavy machining or repair welding; not a delivery condition for pressure service.
Values for the +A condition
Other G12MoCrV5-2 tempers and conditions
G12MoCrV5-2 is listed in 5 conditions; see the grade overview at G12MoCrV5-2.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
+AThis page Annealed | Interim condition for heavy machining or repair welding; not a delivery condition for pressure service. | 290 | 500 | 24 | 150 HB | 7.4 % IACS |
Stress relieved | Applied after major weld repairs or fabrication welding (typically 690–740 °C) to restore toughness and relieve residual stress. | 330 | 555 | 21 | 170 HB | 41 W/m·K |
+NTDefault Normalized and tempered | Standard delivery condition for EN 10213 pressure castings; balanced strength, ductility and creep behaviour up to ~540 °C. | 340 | 570 | 20 | 175 HB | — |
As-cast | Only for non-pressure, non-critical parts or rough stock; properties are non-uniform and not covered by EN 10213 acceptance. | 350 | 600 | 13 | 11 HRC | 7.2 % IACS |
Quenched and tempered | Choose for heavier sections or when higher and more uniform yield strength through-thickness is required. | 400 | 620 | 18 | 195 HB | — |
What is G12MoCrV5-2 +A?
G12MoCrV5-2 +A is G12MoCrV5-2 heat treated to +A — interim condition for heavy machining or repair welding; not a delivery condition for pressure service. G12MoCrV5-2 +A has a yield strength of 290 MPa (42.1 ksi) and a tensile strength of 500 MPa (72.5 ksi) — weaker than 88% of steel grades. Elongation at break is 24% and the elastic modulus is 210 GPa (30.5 Msi). G12MoCrV5-2 +A has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,450°C (2,642 °F). +NT is the default condition FabDigit quotes; +A is available on request or by drawing note.
Advantages
- Low embodied carbon — 1.9 kg CO₂/kg, better than 92% of steel grades
- Easy to machine — 62/100, better than 89% of steel grades
Limitations
- Low strength — 290 MPa (42.1 ksi), worse than 88% of steel grades
G12MoCrV5-2 +A properties
Typical room-temperature values for G12MoCrV5-2 +A; 22 are specific to this condition. Other listed values are G12MoCrV5-2 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
G12MoCrV5-2 +A has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,450°C (2,642 °F).
Mechanical16
G12MoCrV5-2 +A has a yield strength of 290 MPa (42.1 ksi) and a tensile strength of 500 MPa (72.5 ksi) — weaker than 88% of steel grades. Elongation at break is 24% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
G12MoCrV5-2 +A 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 µm/m·K (6.67 µin/in·°F).
Electrical3
G12MoCrV5-2 +A conducts electricity at 7.4 % IACS, worse than 70% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (14/100), better than 70% of steel grades.
Sustainability4
Producing a kilogram of G12MoCrV5-2 +A takes about 24 MJ of energy and emits 1.9 kg of CO₂ — less than 97% of steel grades. Typical recycled content is 70%.
Manufacturability8
G12MoCrV5-2 +A's machinability is good (62/100, better than 89% of steel grades); weldability good (65/100); formability poor (30/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with G12MoCrV5-2 +A
Is G12MoCrV5-2 easy to machine?
Machines like a 0.5 % Mo Cr-Mo steel at 150–200 HB — use coated carbide, moderate speeds and rigid setups; rough-machine before final tempering where possible and expect abrasive cast skin on the first cut.
Can G12MoCrV5-2 be welded?
Weldable with matched Cr-Mo-V or 1.25Cr-0.5Mo filler (SMAW/GTAW/SAW) using 200–250 °C preheat, controlled interpass temperature and 690–740 °C post-weld heat treatment to avoid hard HAZ and reheat cracking.
Can G12MoCrV5-2 be formed, bent or molded?
Supplied as sand or investment castings — design generous fillets and directional solidification with risers/chills; the low-C composition has good fluidity but needs full normalize-and-temper to homogenize dendritic structure.
What surface finishes work on G12MoCrV5-2?
Shot-blast and paint, metallize or aluminize for atmospheric protection; no anodizing possible, and hard chrome or nitriding only for local wear faces below the tempering temperature.
G12MoCrV5-2 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 | 0.1 – 0.15 | 0.12 |
| Si | ≤ 0.45 | 0.35 |
| Mn | 0.4 – 0.7 | 0.55 |
| P | ≤ 0.02 | 0.01 |
| S | ≤ 0.02 | 0.01 |
| Cr | 0.3 – 0.6 | 0.45 |
| Mo | 0.4 – 0.6 | 0.5 |
| V | 0.22 – 0.32 | 0.27 |
| Niresidual, max | ≤ 0.4 | 0.15 |
| Curesidual, max | ≤ 0.3 | 0.1 |
| Fe | balance | — |
G12MoCrV5-2 +A — frequently asked
What is G12MoCrV5-2 +A used for?
G12MoCrV5-2 +A is typically used for valve bodies for steam/petrochemical service, pump casings, flanges for elevated-temperature piping and boiler component castings. In short: easier-machining Cr-Mo-V casting; 540 °C pressure service; better weldability than 1.7725.
What is the yield strength of G12MoCrV5-2 +A?
G12MoCrV5-2 +A has a typical yield strength of 290 MPa (42.1 ksi) and a tensile strength of 500 MPa (72.5 ksi) — weaker than 88% of steel grades. Strength varies by condition: see the 5 listed tempers.
Is G12MoCrV5-2 +A easy to machine?
Reasonably — machinability is rated good (62/100, better than 89% of steel grades). Machines like a 0.5 % Mo Cr-Mo steel at 150–200 HB — use coated carbide, moderate speeds and rigid setups; rough-machine before final tempering where possible and expect abrasive cast skin on the first cut.
Can G12MoCrV5-2 +A be welded?
Yes — weldability is rated good (65/100). Weldable with matched Cr-Mo-V or 1.25Cr-0.5Mo filler (SMAW/GTAW/SAW) using 200–250 °C preheat, controlled interpass temperature and 690–740 °C post-weld heat treatment to avoid hard HAZ and reheat cracking.
What surface finishes work on G12MoCrV5-2 +A?
Shot-blast and paint, metallize or aluminize for atmospheric protection; no anodizing possible, and hard chrome or nitriding only for local wear faces below the tempering temperature.
Can G12MoCrV5-2 +A be formed, bent or molded?
Supplied as sand or investment castings — design generous fillets and directional solidification with risers/chills; the low-C composition has good fluidity but needs full normalize-and-temper to homogenize dendritic structure.
What is the maximum service temperature of G12MoCrV5-2 +A?
G12MoCrV5-2 +A 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.
Sources
- EN 10213 — Steel castings for pressure purposes — CEN (2016)
- EN 10027-1/-2 designation systems (material no. 1.7720) — CEN (2016)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- ASM Handbook Vol. 6 — Welding, Brazing, and Soldering (Cr-Mo-V steels) — ASM International (1993)
- EN 1011-2 — Welding of ferritic steels (preheat/PWHT practice) — CEN (2001)
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.