Steel G12MoCrV5-2
EN 1.7720
G12MoCrV5-2 (1.7720) is a molybdenum-dominant low-alloy cast steel to EN 10213 with small Cr and V additions, giving useful creep strength for pressure parts at moderately elevated temperature.
Reference datasheet — G12MoCrV5-2 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 +NT condition
G12MoCrV5-2 tempers and conditions
G12MoCrV5-2 is supplied in 5 conditions, soft to hard. +NT is the default FabDigit quotes; the values on this page are for it.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
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?
G12MoCrV5-2 (1.7720) is a molybdenum-dominant low-alloy cast steel to EN 10213 with small Cr and V additions, giving useful creep strength for pressure parts at moderately elevated temperature. Typical properties are 340 MPa yield, 570 MPa tensile, 20 % elongation and 175 HB, with service to about 540 °C; it is available in +NT, +QT, annealed, stress-relieved and as-cast conditions. Machinability (55) and weldability (60) are better than the higher-strength Cr-Mo-V cast grades, but welding still requires preheat and PWHT and the alloy offers no corrosion resistance. For higher creep strength at 550 °C, step up to G15CrMoV6-9. G12MoCrV5-2 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). G12MoCrV5-2 has a yield strength of 340 MPa (49.3 ksi) and a tensile strength of 570 MPa (82.7 ksi) — weaker than 76% of steel grades. Elongation at break is 20% and the elastic modulus is 210 GPa (30.5 Msi).
What is G12MoCrV5-2 used for?
- valve bodies for steam/petrochemical service
- pump casings
- flanges for elevated-temperature piping
- boiler component castings
Advantages
- High service temperature — 540°C (1,004 °F), better than 93% of steel grades
- Low embodied carbon — 1.9 kg CO₂/kg, better than 92% of steel grades
Limitations
- Low strength — 340 MPa (49.3 ksi), worse than 76% of steel grades
G12MoCrV5-2 properties
Typical room-temperature values for G12MoCrV5-2-+NT; bars are the position among steel grades.
Physical3
G12MoCrV5-2 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 has a yield strength of 340 MPa (49.3 ksi) and a tensile strength of 570 MPa (82.7 ksi) — weaker than 76% of steel grades. Elongation at break is 20% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
G12MoCrV5-2 is rated for continuous service to 540°C (1,004 °F). It conducts heat at 41 W/m·K (23.7 BTU/hr·ft·°F), worse than 62% of steel grades. Thermal expansion is 12 µm/m·K (6.67 µin/in·°F).
Electrical3
G12MoCrV5-2 conducts electricity at 7.2 % IACS, worse than 71% 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 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's machinability is good (55/100, better than 62% of steel grades); weldability good (60/100); formability poor (25/100).
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. G12MoCrV5-2 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with G12MoCrV5-2
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.
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 |
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.
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 G12MoCrV5-2 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- 1.7720
How much does G12MoCrV5-2 cost?
G12MoCrV5-2 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.
G12MoCrV5-2 — frequently asked
What is G12MoCrV5-2 used for?
G12MoCrV5-2 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?
G12MoCrV5-2 has a typical yield strength of 340 MPa (49.3 ksi) and a tensile strength of 570 MPa (82.7 ksi) — weaker than 76% of steel grades. Strength varies by condition: see the 5 listed tempers.
Is G12MoCrV5-2 easy to machine?
Reasonably — machinability is rated good (55/100, better than 62% 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 be welded?
Yes — weldability is rated good (60/100). 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?
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 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?
G12MoCrV5-2 is rated for continuous use to about 540°C (1,004 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does G12MoCrV5-2 cost?
G12MoCrV5-2 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 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; 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.