Steel A217 WC6
ASTM A217 WC6 · EN 1.7357, G17CrMo5-5
A217 WC6 is a 1.25Cr-0.5Mo cast alloy steel (1.7357, G17CrMo5-5) used for elevated-temperature pressure castings in refinery and power piping.
Reference datasheet — A217 WC6 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 WC6 tempers and conditions
A217 WC6 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 |
|---|---|---|---|---|---|---|
Solution annealed | Non-code intermediate condition used to soften rough castings for heavy machining or weld repair before final N+T; not the delivery condition for A217 pressure parts. | 265 | 480 | 28 | 140 HB | 8 % IACS |
N+T + simulated post-weld heat treatment | Ordered when the casting will see one or more shop/field PWHT cycles; test coupons are given the simulated cycles, giving slightly lower strength. | 320 | 520 | 26 | 160 HB | 7.8 % IACS |
N+TDefault Normalized and tempered | Standard supply condition for ASTM A217 WC6 pressure castings (valve bodies, fittings) — balanced strength, ductility and creep resistance. | 345 | 550 | 24 | 170 HB | 7.8 % IACS |
Quenched and tempered | Chosen for heavy-section castings or when higher yield strength and better toughness uniformity are required within the same A217 spec limits. | 415 | 600 | 22 | 195 HB | — |
What is A217 WC6?
A217 WC6 is a 1.25Cr-0.5Mo cast alloy steel (1.7357, G17CrMo5-5) used for elevated-temperature pressure castings in refinery and power piping. Engineers choose it for creep resistance to about 540 °C at moderate cost, with 345 MPa yield, 550 MPa tensile, 24 % elongation and about 170 HB in the normalized and tempered condition; it is supplied as sand castings such as valve bodies and pump casings. It needs 200–260 °C preheat and 690–720 °C PWHT after welding, and has no inherent corrosion resistance. For hotter or more severe hydrogen service, WC9 (2.25Cr-1Mo) is the next step. A217 WC6 has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,425°C (2,597 °F). A217 WC6 has a yield strength of 345 MPa (50 ksi) and a tensile strength of 550 MPa (79.8 ksi) — weaker than 75% of steel grades. Elongation at break is 24% and the elastic modulus is 205 GPa (29.7 Msi).
What is A217 WC6 used for?
- valve bodies
- pump casings
- pressure flanges
- petrochemical piping components
Advantages
- High service temperature — 540°C (1,004 °F), better than 93% of steel grades
Limitations
- Limited formability — 20/100, worse than 80% of steel grades
- Low strength — 345 MPa (50 ksi), worse than 75% of steel grades
A217 WC6 properties
Typical room-temperature values for A217 WC6-N+T; bars are the position among steel grades.
Physical3
A217 WC6 has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,425°C (2,597 °F).
Mechanical16
A217 WC6 has a yield strength of 345 MPa (50 ksi) and a tensile strength of 550 MPa (79.8 ksi) — weaker than 75% of steel grades. Elongation at break is 24% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
A217 WC6 is rated for continuous service to 540°C (1,004 °F). It conducts heat at 40 W/m·K (23.1 BTU/hr·ft·°F), worse than 64% of steel grades. Thermal expansion is 12.3 µm/m·K (6.83 µin/in·°F).
Electrical3
A217 WC6 conducts electricity at 7.8 % IACS, worse than 57% of steel grades.
Chemical & Environmental2
Corrosion resistance is poor (15/100), better than 75% of steel grades.
Sustainability4
Producing a kilogram of A217 WC6 takes about 26 MJ of energy and emits 2.1 kg of CO₂ — less than 64% of steel grades. Typical recycled content is 85%.
Manufacturability7
A217 WC6's machinability is good (55/100, better than 62% of steel grades); weldability good (60/100); 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 WC6 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with A217 WC6
Is A217 WC6 easy to machine?
Machines like a 4130-class low-alloy steel at ~170 HB — carbide inserts, 120–180 m/min turning, watch for hard skin and residual sand on as-cast surfaces.
Can A217 WC6 be welded?
Weldable with matched E/ER 80S-B2 or E8018-B2 consumables; preheat/interpass 200–260 °C and 690–720 °C PWHT are required to avoid hard HAZ and hydrogen cracking.
Can A217 WC6 be formed, bent or molded?
Supplied as sand castings; good fluidity but high solidification shrinkage — needs generous risering and directional solidification, followed by full re-austenitizing heat treatment.
A217 WC6 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 – 0.2 | 0.15 |
| Mn | 0.5 – 0.8 | 0.65 |
| Si | ≤ 0.6 | 0.4 |
| P | ≤ 0.04 | 0.02 |
| S | ≤ 0.05 | 0.02 |
| Cr | 1 – 1.5 | 1.25 |
| Mo | 0.45 – 0.65 | 0.55 |
| Niresidual | ≤ 0.5 | |
| Curesidual | ≤ 0.5 | |
| Wresidual | ≤ 0.1 | |
| Vresidual; total residuals ≤1.00 % | ≤ 0.03 | |
| Fe | balance |
What surface finishes work on A217 WC6?
No anodizing; shot blast plus zinc-rich primer or heat-resistant aluminium paint for atmospheric service, or internal weld-overlay/lining for corrosive media.
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 WC6 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- 1.7357G17CrMo5-5
How much does A217 WC6 cost?
A217 WC6 is a standard-cost steel ($$), cheaper than about 71% 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 WC6 — frequently asked
What is A217 WC6 used for?
A217 WC6 is typically used for valve bodies, pump casings, pressure flanges and petrochemical piping components. In short: baseline Cr-Mo cast steel; 540 °C creep service; requires post-weld PWHT.
What is the yield strength of A217 WC6?
A217 WC6 has a typical yield strength of 345 MPa (50 ksi) and a tensile strength of 550 MPa (79.8 ksi) — weaker than 75% of steel grades. Strength varies by condition: see the 4 listed tempers.
Is A217 WC6 easy to machine?
Reasonably — machinability is rated good (55/100, better than 62% of steel grades). Machines like a 4130-class low-alloy steel at ~170 HB — carbide inserts, 120–180 m/min turning, watch for hard skin and residual sand on as-cast surfaces.
Can A217 WC6 be welded?
Yes — weldability is rated good (60/100). Weldable with matched E/ER 80S-B2 or E8018-B2 consumables; preheat/interpass 200–260 °C and 690–720 °C PWHT are required to avoid hard HAZ and hydrogen cracking.
What surface finishes work on A217 WC6?
No anodizing; shot blast plus zinc-rich primer or heat-resistant aluminium paint for atmospheric service, or internal weld-overlay/lining for corrosive media.
Can A217 WC6 be formed, bent or molded?
Supplied as sand castings; good fluidity but high solidification shrinkage — needs generous risering and directional solidification, followed by full re-austenitizing heat treatment.
What is the maximum service temperature of A217 WC6?
A217 WC6 is rated for continuous use to about 540°C (1,004 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between A217 WC6 N+T and A217 WC6-A?
N+T is the default condition — standard supply condition for ASTM A217 WC6 pressure castings (valve bodies, fittings) — balanced strength, ductility and creep resistance. A: non-code intermediate condition used to soften rough castings for heavy machining or weld repair before final N+T; not the delivery condition for A217 pressure parts. Yield strength is 345 MPa in N+T versus 265 MPa in A.
How much does A217 WC6 cost?
A217 WC6 is a standard-cost steel ($$), cheaper than about 71% 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 Standard Specification for 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 (G17CrMo5-5 / 1.7357) — CEN (2016)
- ASME BPVC Section II Part D — Materials, Properties (Customary/Metric) — ASME (2023)
- Steel Castings Handbook — Steel Founders' Society of America / ASM International (1995)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- API 941 — Steels for Hydrogen Service at Elevated Temperatures — API (2016)
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.