Steel G17CrMo9-10
ASTM A217 Gr. WC9 · EN 1.7379
G17CrMo9-10 (1.7379) is a 2.25Cr-1Mo cast alloy steel equivalent to ASTM A217 Gr.
Reference datasheet — G17CrMo9-10 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
G17CrMo9-10 tempers and conditions
G17CrMo9-10 is supplied in 3 conditions, soft to hard. +QT is the default FabDigit quotes; the values on this page are for it.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Pick when the casting must be heavily machined or repair-welded before the final strengthening heat treatment. | 270 | 480 | 26 | 145 HB | 8 % IACS |
Normalized and tempered | Common route for thick-wall WC9 castings where liquid quenching is impractical; slightly lower yield and toughness than +QT. | 320 | 540 | 24 | 170 HB | 8 % IACS |
+QTDefault Quenched and tempered | Standard EN 10213 supply condition for pressure-retaining Cr-Mo valve and pump castings; best combination of yield strength and toughness. | 340 | 570 | 22 | 180 HB | 8 % IACS |
Supply forms, finishes and certifications
Ways G17CrMo9-10 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
WC9 | ASTM A217 Gr. WC9 | Certification |
What is G17CrMo9-10?
G17CrMo9-10 (1.7379) is a 2.25Cr-1Mo cast alloy steel equivalent to ASTM A217 Gr. WC9, the mainstream creep-resistant casting grade for power and process plant. Typical tempered properties are 340 MPa yield, 570 MPa tensile, 22 % elongation and about 180 HB, with service to 550 °C, supplied as sand or investment castings for valve bodies and pressure fittings. It requires 200–250 °C preheat and 690–740 °C post-weld heat treatment, and it has no corrosion resistance bare. For hotter service or higher creep strength, GX15CrMo9-1 (C12) is the next step. G17CrMo9-10 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). G17CrMo9-10 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 22% and the elastic modulus is 210 GPa (30.5 Msi).
What is G17CrMo9-10 used for?
- high-temperature/high-pressure valve bodies
- power plant pressure castings
- petrochemical fittings
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
- Tough — resists crack growth — 125 MPa·√m (113.8 ksi·√in), better than 85% of steel grades
Limitations
- Hard to polish — 45/100, worse than 84% of steel grades
- Limited formability — 20/100, worse than 80% of steel grades
- Low strength — 340 MPa (49.3 ksi), worse than 76% of steel grades
G17CrMo9-10 properties
Typical room-temperature values for G17CrMo9-10-+QT; bars are the position among steel grades.
Physical3
G17CrMo9-10 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
G17CrMo9-10 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 22% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
G17CrMo9-10 is rated for continuous service to 550°C (1,022 °F). It conducts heat at 37 W/m·K (21.4 BTU/hr·ft·°F), worse than 71% of steel grades. Thermal expansion is 12.2 µm/m·K (6.78 µin/in·°F).
Electrical3
G17CrMo9-10 conducts electricity at 8 % IACS, better than 55% of steel grades.
Chemical & Environmental3
Corrosion resistance is poor (22/100), better than 90% of steel grades.
Sustainability4
Producing a kilogram of G17CrMo9-10 takes about 33 MJ of energy and emits 2.4 kg of CO₂ — more than 76% of steel grades. Typical recycled content is 70%.
Manufacturability7
G17CrMo9-10's machinability is fair (50/100, worse than 53% of steel grades); weldability good (55/100); formability poor (20/100).
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. G17CrMo9-10 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with G17CrMo9-10
Is G17CrMo9-10 easy to machine?
Machine in the tempered condition with rigid setups, carbide tooling and 60–120 m/min surface speed; remove the abrasive cast skin with a dedicated first pass.
Can G17CrMo9-10 be welded?
Weldable with matching 2.25Cr-1Mo (E9018-B3 / ER90S-B3) consumables using 200–250 °C preheat, controlled interpass and 690–740 °C post-weld heat treatment; avoid hydrogen pickup.
Can G17CrMo9-10 be formed, bent or molded?
Supplied as sand or investment castings — design generous fillets, directional risering and 2–3 % feeding allowance; no cold forming.
G17CrMo9-10 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 |
|---|---|---|
| CASTM A217 WC9 allows 0.05–0.18 | 0.13 – 0.2 | 0.17 |
| Si | ≤ 0.6 | 0.35 |
| MnA217 WC9: 0.40–0.70 | 0.5 – 0.9 | 0.7 |
| P | ≤ 0.02 | 0.01 |
| S | ≤ 0.02 | 0.01 |
| CrA217 WC9: 2.00–2.75 | 2 – 2.5 | 2.25 |
| Mo | 0.9 – 1.2 | 1.05 |
| Niresidual | ≤ 0.3 | 0.15 |
| Fe | balance |
What surface finishes work on G17CrMo9-10?
Shot blast and paint or apply weld overlay/cladding for wet service; can be phosphated or hard-chrome plated on seat areas but is not corrosion resistant bare.
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 G17CrMo9-10 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- ASTM
- A217 Gr. WC9
- EN / DIN / Werkstoff-Nr.
- 1.7379
How much does G17CrMo9-10 cost?
G17CrMo9-10 is a premium-cost steel ($$$), cheaper than about 51% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
G17CrMo9-10 — frequently asked
What is G17CrMo9-10 used for?
G17CrMo9-10 is typically used for high-temperature/high-pressure valve bodies, power plant pressure castings and petrochemical fittings. In short: standard 2.25Cr-1Mo valve casting; WC9 pressure-service grade; weldable creep-resistant casting.
What is the yield strength of G17CrMo9-10?
G17CrMo9-10 has a typical yield strength of 340 MPa (49.3 ksi) and a tensile strength of 570 MPa (82.7 ksi) — weaker than 76% of steel grades. Strength varies by condition: see the 3 listed tempers.
Is G17CrMo9-10 easy to machine?
Reasonably — machinability is rated fair (50/100, worse than 53% of steel grades). Machine in the tempered condition with rigid setups, carbide tooling and 60–120 m/min surface speed; remove the abrasive cast skin with a dedicated first pass.
Can G17CrMo9-10 be welded?
Yes — weldability is rated good (55/100). Weldable with matching 2.25Cr-1Mo (E9018-B3 / ER90S-B3) consumables using 200–250 °C preheat, controlled interpass and 690–740 °C post-weld heat treatment; avoid hydrogen pickup.
What surface finishes work on G17CrMo9-10?
Shot blast and paint or apply weld overlay/cladding for wet service; can be phosphated or hard-chrome plated on seat areas but is not corrosion resistant bare.
Can G17CrMo9-10 be formed, bent or molded?
Supplied as sand or investment castings — design generous fillets, directional risering and 2–3 % feeding allowance; no cold forming.
What is the maximum service temperature of G17CrMo9-10?
G17CrMo9-10 is rated for continuous use to about 550°C (1,022 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does G17CrMo9-10 cost?
G17CrMo9-10 is a premium-cost steel ($$$), 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)
- ASTM A217/A217M — Steel Castings, Martensitic Stainless and Alloy, for Pressure-Containing Parts, Suitable for High-Temperature Service — ASTM (2021)
- ASME BPVC Section II Part D — Material properties (2.25Cr-1Mo) — ASME (2023)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- GB/T 16253 — (ZG15Cr2Mo1) — SAC (2019)
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.