Steel GX10CrMoV9-1
ASTM A217 Gr. C12A · EN 1.7367
GX10CrMoV9-1 (1.7367) is the cast version of the 9Cr-1Mo-V (P91) creep-resistant steel, equivalent to ASTM A217 Gr.
Reference datasheet — GX10CrMoV9-1 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 N+T condition
GX10CrMoV9-1 tempers and conditions
GX10CrMoV9-1 is supplied in 5 conditions, soft to hard. N+T 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 softening treatment for rough machining or repair of raw castings — never a service condition (no creep allowables). | 360 | 580 | 24 | 10 HRC | 3.3 % IACS |
N+T + post-weld/stress-relief heat treatment 740–770 °C | Condition of castings after weld repair or fabrication welding to pipe; strength drops slightly with each additional temper cycle. | 460 | 630 | 22 | 16 HRC | 3.1 % IACS |
N+TDefault Normalized and tempered | Standard supply condition for all power-plant valve and fitting castings; the only condition with ASME creep allowables. | 490 | 660 | 21 | 19 HRC | — |
Quenched and tempered | Used for very heavy-section castings where still-air normalizing cannot fully harden the core; gives slightly higher strength and better core toughness. | 520 | 700 | 20 | 21 HRC | — |
Spheroidize annealed | Raw foundry state only — hard, brittle untempered martensite; must be normalized and tempered before machining or service. | 900 | 1,250 | 6 | 42 HRC | 2.8 % IACS |
What is GX10CrMoV9-1?
GX10CrMoV9-1 (1.7367) is the cast version of the 9Cr-1Mo-V (P91) creep-resistant steel, equivalent to ASTM A217 Gr. C12A and supplied as N+T, Q+T, N+T+SR, ANN and AC. It is used for high-temperature, high-pressure power plant valve and pipe fitting castings, with default values of 490 MPa yield, 660 MPa tensile, 21 % elongation and 215 HB (19 HRC) and service to 600 °C. The martensitic matrix limits machinability (score 45) and weldability (score 35): matching B9 filler, 200–250 °C preheat and 750–770 °C PWHT are mandatory. It is not stainless and forms steam-side scale above about 600 °C; GX15CrMo5 is the simpler alternative where P91 creep strength is not required. GX10CrMoV9-1 has a density of 7.77 g/cm³ (0.281 lb/in³), lighter than 92% of steel grades. It melts at 1,420°C (2,588 °F). GX10CrMoV9-1 has a yield strength of 490 MPa (71.1 ksi) and a tensile strength of 660 MPa (95.7 ksi) — stronger than 61% of steel grades. Elongation at break is 21% and the elastic modulus is 218 GPa (31.6 Msi).
What is GX10CrMoV9-1 used for?
- high-temperature steam valve bodies
- power plant pressure castings
- high-pressure pipe fittings
Advantages
- High service temperature — 600°C (1,112 °F), better than 98% of steel grades
- Good corrosion resistance — 32/100, better than 96% of steel grades
Limitations
- Limited formability — 15/100, worse than 87% of steel grades
- High embodied carbon — 2.6 kg CO₂/kg, worse than 87% of steel grades
- Poor heat conductor — 27 W/m·K (15.6 BTU/hr·ft·°F), worse than 86% of steel grades
GX10CrMoV9-1 properties
Typical room-temperature values for GX10CrMoV9-1-N+T; bars are the position among steel grades.
Physical3
GX10CrMoV9-1 has a density of 7.77 g/cm³ (0.281 lb/in³), lighter than 92% of steel grades. It melts at 1,420°C (2,588 °F).
Mechanical16
GX10CrMoV9-1 has a yield strength of 490 MPa (71.1 ksi) and a tensile strength of 660 MPa (95.7 ksi) — stronger than 61% of steel grades. Elongation at break is 21% and the elastic modulus is 218 GPa (31.6 Msi).
Thermal6
GX10CrMoV9-1 is rated for continuous service to 600°C (1,112 °F). It conducts heat at 27 W/m·K (15.6 BTU/hr·ft·°F), worse than 86% of steel grades. Thermal expansion is 10.8 µm/m·K (6 µin/in·°F).
Electrical2
GX10CrMoV9-1 has an electrical resistivity of 5.5×10⁻⁷ Ω·m.
Chemical & Environmental3
Corrosion resistance is poor (32/100), better than 96% of steel grades.
Sustainability4
Producing a kilogram of GX10CrMoV9-1 takes about 34 MJ of energy and emits 2.6 kg of CO₂ — more than 82% of steel grades. Typical recycled content is 70%.
Manufacturability8
GX10CrMoV9-1's machinability is fair (45/100, worse than 65% of steel grades); weldability fair (35/100); formability poor (15/100).
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. GX10CrMoV9-1 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with GX10CrMoV9-1
Is GX10CrMoV9-1 easy to machine?
Machine in the N+T (or annealed) condition at ~215 HB with rigid setups, coated carbide, moderate speeds and generous coolant; avoid dwelling — the martensitic matrix work-hardens and burnishes.
Can GX10CrMoV9-1 be welded?
Weldable with matching 9CrMoV filler (E9015-B9/ER90S-B9) using 200–250 °C preheat, ≤300 °C interpass, no austenitic filler for creep service, and mandatory 750–770 °C PWHT with cooling below ~100 °C before PWHT; keep Ni+Mn low to avoid depressing Ac1.
Can GX10CrMoV9-1 be formed, bent or molded?
Sand or investment cast with tight N/Al balance and controlled Cr equivalent to avoid δ-ferrite; heavy risers and slow shakeout limit hot tears, and full re-normalizing plus tempering of the whole casting is mandatory after any weld repair.
GX10CrMoV9-1 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 | 0.08 – 0.12 | 0.1 |
| Si | 0.2 – 0.5 | 0.35 |
| Mn | 0.3 – 0.6 | 0.45 |
| P | ≤ 0.02 | |
| S | ≤ 0.01 | |
| Cr | 8 – 9.5 | 8.75 |
| Mo | 0.85 – 1.05 | 0.95 |
| V | 0.18 – 0.25 | 0.21 |
| NbCb | 0.06 – 0.1 | 0.08 |
| Nessential for MX strengthening | 0.03 – 0.07 | 0.05 |
| Nimax; Ni+Mn often limited to ~1.0 to protect Ac1 | ≤ 0.4 | 0.2 |
| Almax — keeps free N available | ≤ 0.02 | |
| Ti | ≤ 0.01 | |
| Zr | ≤ 0.01 | |
| Fe | balance |
What surface finishes work on GX10CrMoV9-1?
Not stainless — protect with paint/aluminium-pigmented high-temperature coating, aluminizing or chromizing; oxide scale forms above ~600 °C in steam and must be removed by pickling or blasting before NDT.
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 GX10CrMoV9-1 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- ASTM
- A217 Gr. C12A
- EN / DIN / Werkstoff-Nr.
- 1.7367
How much does GX10CrMoV9-1 cost?
GX10CrMoV9-1 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.
GX10CrMoV9-1 — frequently asked
What is GX10CrMoV9-1 used for?
GX10CrMoV9-1 is typically used for high-temperature steam valve bodies, power plant pressure castings and high-pressure pipe fittings. In short: cast P91 creep steel; A217 C12A pressure grade; highest creep strength here.
What is the yield strength of GX10CrMoV9-1?
GX10CrMoV9-1 has a typical yield strength of 490 MPa (71.1 ksi) and a tensile strength of 660 MPa (95.7 ksi) — stronger than 61% of steel grades. Strength varies by condition: see the 5 listed tempers.
Is GX10CrMoV9-1 easy to machine?
Reasonably — machinability is rated fair (45/100, worse than 65% of steel grades). Machine in the N+T (or annealed) condition at ~215 HB with rigid setups, coated carbide, moderate speeds and generous coolant; avoid dwelling — the martensitic matrix work-hardens and burnishes.
Can GX10CrMoV9-1 be welded?
With care — weldability is rated fair (35/100). Weldable with matching 9CrMoV filler (E9015-B9/ER90S-B9) using 200–250 °C preheat, ≤300 °C interpass, no austenitic filler for creep service, and mandatory 750–770 °C PWHT with cooling below ~100 °C before PWHT; keep Ni+Mn low to avoid depressing Ac1.
What surface finishes work on GX10CrMoV9-1?
Not stainless — protect with paint/aluminium-pigmented high-temperature coating, aluminizing or chromizing; oxide scale forms above ~600 °C in steam and must be removed by pickling or blasting before NDT.
Can GX10CrMoV9-1 be formed, bent or molded?
Sand or investment cast with tight N/Al balance and controlled Cr equivalent to avoid δ-ferrite; heavy risers and slow shakeout limit hot tears, and full re-normalizing plus tempering of the whole casting is mandatory after any weld repair.
What is the maximum service temperature of GX10CrMoV9-1?
GX10CrMoV9-1 is rated for continuous use to about 600°C (1,112 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between GX10CrMoV9-1 N+T and GX10CrMoV9-1-AC?
N+T is the default condition — standard supply condition for all power-plant valve and fitting castings; the only condition with ASME creep allowables. AC: raw foundry state only — hard, brittle untempered martensite; must be normalized and tempered before machining or service. Yield strength is 490 MPa in N+T versus 900 MPa in AC.
How much does GX10CrMoV9-1 cost?
GX10CrMoV9-1 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
- ASTM A217/A217M — Steel Castings, Martensitic Stainless and Alloy, for Pressure-Containing Parts (Gr. C12A) — ASTM International (2021)
- EN 10213 — Steel castings for pressure purposes — CEN (2016)
- ASME BPVC Section II Part D — allowable stresses and physical properties, Grade 91 — ASME (2023)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- EPRI/ASM guidance on Grade 91 steel fabrication and heat treatment — EPRI (2015)
- P91/ZG9Cr1MoV 1688 / Mysteel — 1688 / Mysteel (2026)
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.