Steel G17CrMoV5-10
EN 1.7706
G17CrMoV5-10 (1.7706) is a 1.25Cr-1Mo-V cast alloy steel in which vanadium carbides raise creep strength above plain CrMo casting grades.
Reference datasheet — G17CrMoV5-10 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 +QT condition
G17CrMoV5-10 tempers and conditions
G17CrMoV5-10 is supplied in 5 conditions, soft to hard. +QT 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 | Used between casting and final QT to lower hardness for rough machining and weld repair; not a service condition. | 320 | 550 | 21 | 165 HB | 8 % IACS |
As fabricated | Raw foundry condition with coarse dendritic structure and low toughness; always heat treated before service. | 370 | 640 | 9 | 16 HRC | 7.6 % IACS |
Normalized and tempered | Alternative for very heavy sections where quench severity cannot be achieved; slightly lower toughness and strength at mid-wall. | 435 | 620 | 16 | 15 HRC | 7.8 % IACS |
Quenched, tempered and post-weld stress relieved | Condition of fabricated/weld-repaired castings after final PWHT; marginally softer than +QT with restored toughness. | 445 | 630 | 18 | 15 HRC | 7.8 % IACS |
+QTDefault Quenched and tempered | Standard EN 10213 delivery condition for turbine casings and valve bodies operating up to ~550 °C. | 460 | 650 | 17 | 210 HB | — |
What is G17CrMoV5-10?
G17CrMoV5-10 (1.7706) is a 1.25Cr-1Mo-V cast alloy steel in which vanadium carbides raise creep strength above plain CrMo casting grades. It is used for steam turbine casings and high-temperature valve bodies, giving 460 MPa yield, 650 MPa tensile, 17 % elongation and about 210 HB in the quenched and tempered condition, with service to 550 °C. Weldability is limited (score 40): 250–350 °C preheat and 690–740 °C PWHT are mandatory, machinability is modest at 45, and bare surfaces need coating. G17CrMo9-10 welds more easily where the extra creep strength is not required. G17CrMoV5-10 has a density of 7.75 g/cm³ (0.28 lb/in³), lighter than 93% of steel grades. It melts at 1,425°C (2,597 °F). G17CrMoV5-10 has a yield strength of 460 MPa (66.7 ksi) and a tensile strength of 650 MPa (94.3 ksi) — stronger than 55% of steel grades. Elongation at break is 17% and the elastic modulus is 210 GPa (30.5 Msi).
What is G17CrMoV5-10 used for?
- steam turbine casings
- high-temperature valve bodies
- power plant pressure castings
Advantages
- High service temperature — 550°C (1,022 °F), better than 95% of steel grades
- Good corrosion resistance — 22/100, better than 90% of steel grades
Limitations
- Limited formability — 12/100, worse than 92% of steel grades
G17CrMoV5-10 properties
Typical room-temperature values for G17CrMoV5-10-+QT; bars are the position among steel grades.
Physical3
G17CrMoV5-10 has a density of 7.75 g/cm³ (0.28 lb/in³), lighter than 93% of steel grades. It melts at 1,425°C (2,597 °F).
Mechanical16
G17CrMoV5-10 has a yield strength of 460 MPa (66.7 ksi) and a tensile strength of 650 MPa (94.3 ksi) — stronger than 55% of steel grades. Elongation at break is 17% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
G17CrMoV5-10 is rated for continuous service to 550°C (1,022 °F). It conducts heat at 40 W/m·K (23.1 BTU/hr·ft·°F), worse than 64% of steel grades. Thermal expansion is 11.5 µm/m·K (6.39 µin/in·°F).
Electrical3
G17CrMoV5-10 conducts electricity at 7.8 % IACS, worse than 57% of steel grades.
Chemical & Environmental2
Corrosion resistance is poor (22/100), better than 90% of steel grades.
Sustainability4
Producing a kilogram of G17CrMoV5-10 takes about 30 MJ of energy and emits 2.2 kg of CO₂ — more than 56% of steel grades. Typical recycled content is 75%.
Manufacturability7
G17CrMoV5-10's machinability is fair (45/100, worse than 65% of steel grades); weldability fair (40/100); formability not recommended (12/100).
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. G17CrMoV5-10 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with G17CrMoV5-10
Is G17CrMoV5-10 easy to machine?
Machine in the annealed or tempered state with rigid setups and carbide inserts (~90–150 m/min turning); expect abrasive V-carbide wear and hard scale on as-cast surfaces — remove skin with a first heavy cut.
Can G17CrMoV5-10 be welded?
Weldable with matching CrMoV or 1.25Cr-1Mo low-hydrogen consumables using 250–350 °C preheat/interpass and mandatory 690–740 °C PWHT; slow cooling and hydrogen bake-out prevent HAZ cracking.
Can G17CrMoV5-10 be formed, bent or molded?
Foundry grade only — needs generous risering and directional solidification in heavy sections; full austenitize + temper cycle after casting to remove dendritic segregation.
G17CrMoV5-10 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 | 0.15 – 0.2 | 0.17 |
| Si | ≤ 0.6 | 0.35 |
| Mn | 0.5 – 0.9 | 0.7 |
| Pkept low to limit temper embrittlement | ≤ 0.02 | 0.01 |
| S | ≤ 0.02 | 0.01 |
| Cr | 1.2 – 1.5 | 1.35 |
| Mo | 0.9 – 1.1 | 1 |
| VV(C,N) precipitation gives the creep strength | 0.2 – 0.3 | 0.25 |
| Niresidual limit | ≤ 0.4 | 0.2 |
| Curesidual limit | ≤ 0.3 | 0.1 |
| Fe | balance |
What surface finishes work on G17CrMoV5-10?
Normally shot-blasted and painted or left with a protective steam-side oxide; can be nitrided or aluminized locally for erosion resistance, no anodizing applicable.
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 G17CrMoV5-10 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- 1.7706
How much does G17CrMoV5-10 cost?
G17CrMoV5-10 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.
G17CrMoV5-10 — frequently asked
What is G17CrMoV5-10 used for?
G17CrMoV5-10 is typically used for steam turbine casings, high-temperature valve bodies and power plant pressure castings. In short: highest creep strength CrMoV casting; turbine casing grade; demanding weld procedure.
What is the yield strength of G17CrMoV5-10?
G17CrMoV5-10 has a typical yield strength of 460 MPa (66.7 ksi) and a tensile strength of 650 MPa (94.3 ksi) — stronger than 55% of steel grades. Strength varies by condition: see the 5 listed tempers.
Is G17CrMoV5-10 easy to machine?
Reasonably — machinability is rated fair (45/100, worse than 65% of steel grades). Machine in the annealed or tempered state with rigid setups and carbide inserts (~90–150 m/min turning); expect abrasive V-carbide wear and hard scale on as-cast surfaces — remove skin with a first heavy cut.
Can G17CrMoV5-10 be welded?
With care — weldability is rated fair (40/100). Weldable with matching CrMoV or 1.25Cr-1Mo low-hydrogen consumables using 250–350 °C preheat/interpass and mandatory 690–740 °C PWHT; slow cooling and hydrogen bake-out prevent HAZ cracking.
What surface finishes work on G17CrMoV5-10?
Normally shot-blasted and painted or left with a protective steam-side oxide; can be nitrided or aluminized locally for erosion resistance, no anodizing applicable.
Can G17CrMoV5-10 be formed, bent or molded?
Foundry grade only — needs generous risering and directional solidification in heavy sections; full austenitize + temper cycle after casting to remove dendritic segregation.
What is the maximum service temperature of G17CrMoV5-10?
G17CrMoV5-10 is rated for continuous use to about 550°C (1,022 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between G17CrMoV5-10 +QT and G17CrMoV5-10-F?
+QT is the default condition — standard EN 10213 delivery condition for turbine casings and valve bodies operating up to ~550 °C. F: raw foundry condition with coarse dendritic structure and low toughness; always heat treated before service. Yield strength is 460 MPa in +QT versus 370 MPa in F.
How much does G17CrMoV5-10 cost?
G17CrMoV5-10 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
- EN 10213 — Steel castings for pressure purposes — CEN (2016)
- GB/T 16253 — (ZG15Cr1Mo1V equivalent) — SAC (2019)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- ASM Handbook Vol.19 — Fatigue and Fracture — ASM International (1996)
- Steel foundry datasheets for turbine-casing CrMoV castings (1.7706) — various EU/CN foundries (2023)
- 1688 / Mysteel — Mysteel (2025)
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.