Steel G17CrMo5-5
ASTM A217 Gr. WC6 · EN 1.7357
G17CrMo5-5 (1.7357) is a 1.25Cr-0.5Mo elevated-temperature cast steel equivalent to ASTM A217 Gr.
Reference datasheet — G17CrMo5-5 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
G17CrMo5-5 tempers and conditions
G17CrMo5-5 is supplied in 5 conditions, soft to hard. +QT 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 | Choose for maximum machinability and lowest hardness before final quench-and-temper or for low-stress non-pressure parts. | 290 | 500 | 26 | 145 HB | — |
Normalized (~ 920–960 °C, air cool) and tempered 680–730 °C | Standard route for thick-walled or complex castings where quenching risks cracking; slightly lower yield than +QT but very stable at temperature. | 350 | 545 | 23 | 165 HB | 7.8 % IACS |
Quenched and tempered, then post-weld/stress-relieved 620–680 °C | For castings that have been weld-repaired or welded into assemblies; PWHT below the tempering temperature restores toughness with a small drop in strength. | 360 | 555 | 23 | 168 HB | 7.8 % IACS |
+QTDefault Quenched and tempered | Default delivery condition per EN 10213 for pressure castings: best combination of 315 MPa min yield, 20 % elongation and 40 J CVN. | 380 | 570 | 22 | 175 HB | — |
As fabricated | Foundry intermediate state only — not permitted for pressure service; hard, brittle bainitic/martensitic areas and high residual stress. | 400 | 650 | 12 | 18 HRC | 7.6 % IACS |
What is G17CrMo5-5?
G17CrMo5-5 (1.7357) is a 1.25Cr-0.5Mo elevated-temperature cast steel equivalent to ASTM A217 Gr. WC6, supplied as F, +A, +N+T, +QT and +QT+SR. It is specified for valve bodies and pressure parts operating at moderately high temperature, with default values of 380 MPa yield, 570 MPa tensile, 22 % elongation and 175 HB (88 HRB) and service to 550 °C. Machinability rates about 50, and welding requires matched B2 filler with mandatory 680–730 °C PWHT. It is not corrosion resistant and needs high-temperature coating; GX15CrMo5 covers higher temperatures. G17CrMo5-5 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). G17CrMo5-5 has a yield strength of 380 MPa (55.1 ksi) and a tensile strength of 570 MPa (82.7 ksi) — weaker than 68% of steel grades. Elongation at break is 22% and the elastic modulus is 210 GPa (30.5 Msi).
What is G17CrMo5-5 used for?
- steam valve bodies
- power plant pressure castings
- high-temperature piping fittings
Advantages
- High service temperature — 550°C (1,022 °F), better than 95% of steel grades
Limitations
- Limited formability — 20/100, worse than 80% of steel grades
G17CrMo5-5 properties
Typical room-temperature values for G17CrMo5-5-+QT; bars are the position among steel grades.
Physical3
G17CrMo5-5 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
G17CrMo5-5 has a yield strength of 380 MPa (55.1 ksi) and a tensile strength of 570 MPa (82.7 ksi) — weaker than 68% of steel grades. Elongation at break is 22% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
G17CrMo5-5 is rated for continuous service to 550°C (1,022 °F). It conducts heat at 42 W/m·K (24.3 BTU/hr·ft·°F), worse than 56% of steel grades. Thermal expansion is 12.3 µm/m·K (6.83 µin/in·°F).
Electrical3
G17CrMo5-5 conducts electricity at 7.8 % IACS, worse than 57% of steel grades.
Chemical & Environmental3
Corrosion resistance is poor (15/100), better than 75% of steel grades.
Sustainability4
Producing a kilogram of G17CrMo5-5 takes about 27 MJ of energy and emits 2.2 kg of CO₂ — less than 59% of steel grades. Typical recycled content is 80%.
Manufacturability8
G17CrMo5-5'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. G17CrMo5-5 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with G17CrMo5-5
Is G17CrMo5-5 easy to machine?
Machines like annealed 4130/4140 at ~60 % of AISI 1212 — use rigid setups, coated carbide, moderate speed and generous coolant; expect hard spots at chills and in un-tempered as-cast areas.
Can G17CrMo5-5 be welded?
Weldable with matched E/ER 80S-B2 or E8018-B2 filler; preheat 200–250 °C, interpass ≤ 350 °C, low-hydrogen practice, and mandatory PWHT at 680–730 °C to avoid hydrogen and reheat cracking.
Can G17CrMo5-5 be formed, bent or molded?
Sand or investment cast with generous risering (solidification range is wide); design 3–5 % shrink allowance, avoid abrupt section changes, and always heat treat (+N+T or +QT) before proof testing.
G17CrMo5-5 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 |
|---|---|---|
| CEN 10213; A217 WC6 allows 0.05–0.20 | 0.15 – 0.2 | 0.17 |
| Si | ≤ 0.6 | 0.4 |
| Mn | 0.5 – 1 | 0.75 |
| P | ≤ 0.02 | 0.01 |
| S | ≤ 0.02 | 0.01 |
| Cr | 1 – 1.5 | 1.25 |
| Mo | 0.45 – 0.65 | 0.55 |
| Niresidual | ≤ 0.4 | 0.15 |
| Curesidual | ≤ 0.3 | 0.15 |
| Vresidual | ≤ 0.05 | 0.02 |
| Fe | balance |
What surface finishes work on G17CrMo5-5?
Not corrosion resistant — shot blast then apply high-temperature aluminium/silicone paint, Al metallizing or Ni/Cr plating; machined sealing faces are often hardfaced with Stellite in valve service.
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 G17CrMo5-5 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- ASTM
- A217 Gr. WC6
- EN / DIN / Werkstoff-Nr.
- 1.7357
How much does G17CrMo5-5 cost?
G17CrMo5-5 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.
G17CrMo5-5 — frequently asked
What is G17CrMo5-5 used for?
G17CrMo5-5 is typically used for steam valve bodies, power plant pressure castings and high-temperature piping fittings. In short: A217 WC6 pressure casting; creep service to 550 °C; standard steam valve grade.
What is the yield strength of G17CrMo5-5?
G17CrMo5-5 has a typical yield strength of 380 MPa (55.1 ksi) and a tensile strength of 570 MPa (82.7 ksi) — weaker than 68% of steel grades. Strength varies by condition: see the 5 listed tempers.
Is G17CrMo5-5 easy to machine?
Reasonably — machinability is rated fair (50/100, worse than 53% of steel grades). Machines like annealed 4130/4140 at ~60 % of AISI 1212 — use rigid setups, coated carbide, moderate speed and generous coolant; expect hard spots at chills and in un-tempered as-cast areas.
Can G17CrMo5-5 be welded?
Yes — weldability is rated good (55/100). Weldable with matched E/ER 80S-B2 or E8018-B2 filler; preheat 200–250 °C, interpass ≤ 350 °C, low-hydrogen practice, and mandatory PWHT at 680–730 °C to avoid hydrogen and reheat cracking.
What surface finishes work on G17CrMo5-5?
Not corrosion resistant — shot blast then apply high-temperature aluminium/silicone paint, Al metallizing or Ni/Cr plating; machined sealing faces are often hardfaced with Stellite in valve service.
Can G17CrMo5-5 be formed, bent or molded?
Sand or investment cast with generous risering (solidification range is wide); design 3–5 % shrink allowance, avoid abrupt section changes, and always heat treat (+N+T or +QT) before proof testing.
What is the maximum service temperature of G17CrMo5-5?
G17CrMo5-5 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 G17CrMo5-5 +QT and G17CrMo5-5-F?
+QT is the default condition — default delivery condition per EN 10213 for pressure castings: best combination of 315 MPa min yield, 20 % elongation and 40 J CVN. F: foundry intermediate state only — not permitted for pressure service; hard, brittle bainitic/martensitic areas and high residual stress. Yield strength is 380 MPa in +QT versus 400 MPa in F.
How much does G17CrMo5-5 cost?
G17CrMo5-5 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
- EN 10213 — Steel castings for pressure purposes — CEN (2016)
- ASTM A217/A217M — Martensitic stainless and alloy steel castings for pressure-containing parts (Gr. WC6) — ASTM International (2021)
- ASME BPVC Section II Part D — Material properties (1.25Cr-0.5Mo) — ASME (2023)
- Steel Castings Handbook, 6th ed. — Steel Founders' Society of America / ASM (1995)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- GB/T 16253 — (ZG20CrMo class) — 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.