Steel A217 WC9
ASTM A217 WC9 · EN 1.7379, G17CrMo9-10
A217 WC9 is a 2.25Cr-1Mo cast alloy steel (1.7379, G17CrMo9-10) with higher chromium than WC6, giving improved creep strength and resistance to high-temperature hydrogen attack.
Reference datasheet — A217 WC9 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
A217 WC9 tempers and conditions
A217 WC9 is supplied in 4 conditions, soft to hard. N+T is the default FabDigit quotes; the values on this page are for it.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Fully annealed and tempered | Pick full annealing plus tempering when lowest hardness (150 HB), best machinability and maximum dimensional stability matter; strength sits at the specification floor of 295 MPa yield. | 295 | 505 | 27 | 150 HB | 7.2 % IACS |
N+T + simulated PWHT | Use these softened post-weld values (300 MPa yield, 520 MPa tensile, 160 HB) for welded assemblies and castings that will see repeated post-weld heat treatment cycles. | 300 | 520 | 25 | 160 HB | 7.2 % IACS |
N+TDefault Normalized and tempered | Standard supply condition, normalized and tempered at 675 °C or above: pick for routine high-temperature pressure castings such as valve bodies, pump casings and fittings up to 565 °C. | 320 | 550 | 24 | 170 HB | 7.2 % IACS |
Quenched and tempered | Choose liquid quenching plus tempering at 675 °C or above for heavy sections or where higher and more uniform strength and toughness are needed, at 380 MPa yield and slightly lower machinability. | 380 | 585 | 22 | 185 HB | 7 % IACS |
Supply forms, finishes and certifications
Ways A217 WC9 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
NACE | NACE MR0175 / ISO 15156 | Certification |
What is A217 WC9?
A217 WC9 is a 2.25Cr-1Mo cast alloy steel (1.7379, G17CrMo9-10) with higher chromium than WC6, giving improved creep strength and resistance to high-temperature hydrogen attack. It is specified for sand-cast valve and pump bodies, hydroprocessing castings and steam piping components rated to about 565 °C, with 320 MPa yield, 550 MPa tensile, 24 % elongation and about 170 HB after normalizing and tempering. Machinability is moderate (score 50) and welding needs preheat plus 690–750 °C PWHT. Where 565 °C is not enough, cast C12A (9Cr-1Mo-V) is the alternative. A217 WC9 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). A217 WC9 has a yield strength of 320 MPa (46.4 ksi) and a tensile strength of 550 MPa (79.8 ksi) — weaker than 81% of steel grades. Elongation at break is 24% and the elastic modulus is 210 GPa (30.5 Msi).
What is A217 WC9 used for?
- high-temperature valve and pump bodies
- hydroprocessing unit castings
- steam piping components
- pressure vessel fittings
Advantages
- High service temperature — 565°C (1,049 °F), better than 96% of steel grades
- Tough — resists crack growth — 120 MPa·√m (109.2 ksi·√in), better than 81% of steel grades
Limitations
- Low strength — 320 MPa (46.4 ksi), worse than 81% of steel grades
- Limited formability — 20/100, worse than 80% of steel grades
A217 WC9 properties
Typical room-temperature values for A217 WC9-N+T; bars are the position among steel grades.
Physical3
A217 WC9 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
A217 WC9 has a yield strength of 320 MPa (46.4 ksi) and a tensile strength of 550 MPa (79.8 ksi) — weaker than 81% of steel grades. Elongation at break is 24% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
A217 WC9 is rated for continuous service to 565°C (1,049 °F). It conducts heat at 36 W/m·K (20.8 BTU/hr·ft·°F), worse than 73% of steel grades. Thermal expansion is 12.3 µm/m·K (6.83 µin/in·°F).
Electrical3
A217 WC9 conducts electricity at 7.2 % IACS, worse than 71% of steel grades.
Chemical & Environmental3
Corrosion resistance is poor (20/100), better than 87% of steel grades.
Sustainability4
Producing a kilogram of A217 WC9 takes about 27 MJ of energy and emits 2.3 kg of CO₂ — less than 59% of steel grades. Typical recycled content is 75%.
Manufacturability7
A217 WC9's machinability is fair (50/100, worse than 53% of steel grades); weldability fair (50/100); 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. A217 WC9 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with A217 WC9
Is A217 WC9 easy to machine?
In the normalized and tempered condition at about 170 HB machinability is moderate, roughly 55 % of AISI 1212 (score 50). Use coated carbide at moderate speed with heavier feed, and expect faster tool wear where cast skin or entrapped sand remains.
Can A217 WC9 be welded?
Weldable with 200–250 °C preheat and maintained interpass temperature, using B3-class 2.25Cr-1Mo filler such as E9015-B3 or ER90S-B3. Follow with 690–750 °C PWHT for hydrogen removal and stress relief.
Can A217 WC9 be formed, bent or molded?
Produced as sand or resin-sand castings; solidification shrinkage is large, so plan adequate risering and progressive solidification. Finished castings are not cold formed, and any hot straightening must be followed by re-heat-treatment.
A217 WC9 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 | 0.05 – 0.18 | 0.13 |
| Si | ≤ 0.6 | 0.35 |
| Mn | 0.4 – 0.7 | 0.55 |
| P | ≤ 0.04 | 0.02 |
| S | ≤ 0.05 | 0.02 |
| Cr | 2 – 2.75 | 2.3 |
| Mo | 0.9 – 1.2 | 1.05 |
| Niresidual element limit | ≤ 0.5 | |
| Curesidual element limit | ≤ 0.5 | |
| Wresidual element limit | ≤ 0.1 | |
| Vresidual element limit | ≤ 0.03 | |
| Fe | balance |
What surface finishes work on A217 WC9?
Not resistant to atmospheric corrosion — blast, then apply a high-temperature heat-resistant coating or an aluminizing/pack-aluminide treatment. Seating faces are usually hardfaced with a hard alloy or stainless weld overlay; anodizing does not apply.
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 A217 WC9 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- 1.7379G17CrMo9-10
How much does A217 WC9 cost?
A217 WC9 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.
A217 WC9 — frequently asked
What is A217 WC9 used for?
A217 WC9 is typically used for high-temperature valve and pump bodies, hydroprocessing unit castings, steam piping components and pressure vessel fittings. In short: hotter service than WC6; hydrogen-attack resistant casting; 565 °C rating.
What is the yield strength of A217 WC9?
A217 WC9 has a typical yield strength of 320 MPa (46.4 ksi) and a tensile strength of 550 MPa (79.8 ksi) — weaker than 81% of steel grades. Strength varies by condition: see the 4 listed tempers.
Is A217 WC9 easy to machine?
Reasonably — machinability is rated fair (50/100, worse than 53% of steel grades). In the normalized and tempered condition at about 170 HB machinability is moderate, roughly 55 % of AISI 1212 (score 50). Use coated carbide at moderate speed with heavier feed, and expect faster tool wear where cast skin or entrapped sand remains.
Can A217 WC9 be welded?
With care — weldability is rated fair (50/100). Weldable with 200–250 °C preheat and maintained interpass temperature, using B3-class 2.25Cr-1Mo filler such as E9015-B3 or ER90S-B3. Follow with 690–750 °C PWHT for hydrogen removal and stress relief.
What surface finishes work on A217 WC9?
Not resistant to atmospheric corrosion — blast, then apply a high-temperature heat-resistant coating or an aluminizing/pack-aluminide treatment. Seating faces are usually hardfaced with a hard alloy or stainless weld overlay; anodizing does not apply.
Can A217 WC9 be formed, bent or molded?
Produced as sand or resin-sand castings; solidification shrinkage is large, so plan adequate risering and progressive solidification. Finished castings are not cold formed, and any hot straightening must be followed by re-heat-treatment.
What is the maximum service temperature of A217 WC9?
A217 WC9 is rated for continuous use to about 565°C (1,049 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does A217 WC9 cost?
A217 WC9 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, Suitable for High-Temperature Service — ASTM International (2021)
- EN 10213 — Steel castings for pressure purposes (G17CrMo9-10, 1.7379) — CEN (2016)
- ASME BPVC Section II Part D — Properties (Metric): 2.25Cr-1Mo materials — ASME (2023)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- API RP 941 — Steels for Hydrogen Service at Elevated Temperatures (Nelson curves) — API (2016)
- NACE MR0175 / ISO 15156 — Materials for use in H2S-containing environments — NACE/ISO (2015)
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.