Steel G17CrMoV5-10 +NT (Normalized and tempered)
Heat-treated state
EN 1.7706
Alternative for very heavy sections where quench severity cannot be achieved; slightly lower toughness and strength at mid-wall.
Values for the +NT condition
Other G17CrMoV5-10 tempers and conditions
G17CrMoV5-10 is listed in 5 conditions; see the grade overview at G17CrMoV5-10.
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 |
+NTThis page 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 +NT?
G17CrMoV5-10 +NT is G17CrMoV5-10 heat treated to +NT — alternative for very heavy sections where quench severity cannot be achieved; slightly lower toughness and strength at mid-wall. G17CrMoV5-10 +NT has a yield strength of 435 MPa (63.1 ksi) and a tensile strength of 620 MPa (89.9 ksi) — stronger than 50% of steel grades. Elongation at break is 16% and the elastic modulus is 210 GPa (30.5 Msi). G17CrMoV5-10 +NT 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). +QT is the default condition FabDigit quotes; +NT is available on request or by drawing note.
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 — 14/100, worse than 90% of steel grades
G17CrMoV5-10 +NT properties
Typical room-temperature values for G17CrMoV5-10 +NT; 23 are specific to this condition. Other listed values are G17CrMoV5-10 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
G17CrMoV5-10 +NT 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 +NT has a yield strength of 435 MPa (63.1 ksi) and a tensile strength of 620 MPa (89.9 ksi) — stronger than 50% of steel grades. Elongation at break is 16% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
G17CrMoV5-10 +NT is rated for continuous service to 550°C (1,022 °F). It conducts heat at 41 W/m·K (23.7 BTU/hr·ft·°F), worse than 62% of steel grades. Thermal expansion is 11.5 µm/m·K (6.39 µin/in·°F).
Electrical3
G17CrMoV5-10 +NT 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 +NT 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 +NT's machinability is fair (48/100, worse than 57% of steel grades); weldability fair (42/100); formability not recommended (14/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with G17CrMoV5-10 +NT
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.
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.
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 | — |
G17CrMoV5-10 +NT — frequently asked
What is G17CrMoV5-10 +NT used for?
G17CrMoV5-10 +NT 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 +NT?
G17CrMoV5-10 +NT has a typical yield strength of 435 MPa (63.1 ksi) and a tensile strength of 620 MPa (89.9 ksi) — stronger than 50% of steel grades. Strength varies by condition: see the 5 listed tempers.
Is G17CrMoV5-10 +NT easy to machine?
Reasonably — machinability is rated fair (48/100, worse than 57% 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 +NT be welded?
With care — weldability is rated fair (42/100). 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 +NT?
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 +NT 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 +NT?
G17CrMoV5-10 +NT 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.
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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.