Steel GX15CrMo5
ASTM A217 Gr. C5 · EN 1.7365
GX15CrMo5 (1.7365) is a 5Cr-0.5Mo heat-resistant cast steel equivalent to ASTM A217 Gr.
Reference datasheet — GX15CrMo5 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
GX15CrMo5 tempers and conditions
GX15CrMo5 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 |
|---|---|---|---|---|---|---|
Annealed | Softest condition for heavy rough machining or major weld repair; must be re-normalized and tempered before pressure service. | 340 | 560 | 26 | 165 HB | 4 % IACS |
As-cast + stress relieved | Only for non-code parts or trial castings — brittle as-cast structure with poor and scattered impact properties. | 450 | 700 | 10 | 21 HRC | 3.7 % IACS |
N+TDefault Normalized and tempered | Standard supply condition for pressure castings — balanced strength, creep resistance and 27 J minimum impact energy. | 480 | 680 | 22 | 200 HB | — |
Quenched and tempered | Choose when higher yield strength or thick-section uniformity is needed; temper high enough to stay within the 241 HB ceiling for valve bodies. | 580 | 760 | 18 | 22 HRC | — |
What is GX15CrMo5?
GX15CrMo5 (1.7365) is a 5Cr-0.5Mo heat-resistant cast steel equivalent to ASTM A217 Gr. C5, available as N+T, QT, ANN and AC+SR. The higher chromium content gives oxidation resistance and elevated-temperature strength beyond the 1.25Cr grades, with default values of 480 MPa yield, 680 MPa tensile, 22 % elongation and 200 HB and service to 620 °C. It is a P-No.5B material: welding (score 40) needs 200–300 °C preheat and mandatory 700–750 °C PWHT, and the abrasive Cr carbides reduce machinability to about 45. G17CrMo5-5 is easier to weld and machine where 550 °C is sufficient. GX15CrMo5 has a density of 7.75 g/cm³ (0.28 lb/in³), lighter than 93% of steel grades. It melts at 1,450°C (2,642 °F). GX15CrMo5 has a yield strength of 480 MPa (69.6 ksi) and a tensile strength of 680 MPa (98.6 ksi) — stronger than 59% of steel grades. Elongation at break is 22% and the elastic modulus is 213 GPa (30.9 Msi).
What is GX15CrMo5 used for?
- high-temperature valve bodies
- petrochemical pressure castings
- furnace and boiler fittings
Advantages
- High service temperature — 620°C (1,148 °F), better than 99% of steel grades
- Good corrosion resistance — 25/100, better than 92% of steel grades
Limitations
- Limited formability — 10/100, worse than 95% of steel grades
- Low electrical conductivity — 3.8 % IACS, worse than 84% of steel grades
- High embodied carbon — 2.5 kg CO₂/kg, worse than 82% of steel grades
GX15CrMo5 properties
Typical room-temperature values for GX15CrMo5-N+T; bars are the position among steel grades.
Physical3
GX15CrMo5 has a density of 7.75 g/cm³ (0.28 lb/in³), lighter than 93% of steel grades. It melts at 1,450°C (2,642 °F).
Mechanical17
GX15CrMo5 has a yield strength of 480 MPa (69.6 ksi) and a tensile strength of 680 MPa (98.6 ksi) — stronger than 59% of steel grades. Elongation at break is 22% and the elastic modulus is 213 GPa (30.9 Msi).
Thermal6
GX15CrMo5 is rated for continuous service to 620°C (1,148 °F). It conducts heat at 36 W/m·K (20.8 BTU/hr·ft·°F), worse than 73% of steel grades. Thermal expansion is 11.5 µm/m·K (6.39 µin/in·°F).
Electrical3
GX15CrMo5 conducts electricity at 3.8 % IACS, worse than 84% of steel grades.
Chemical & Environmental3
Corrosion resistance is poor (25/100), better than 92% of steel grades.
Sustainability4
Producing a kilogram of GX15CrMo5 takes about 32 MJ of energy and emits 2.5 kg of CO₂ — more than 70% of steel grades. Typical recycled content is 75%.
Manufacturability8
GX15CrMo5's machinability is fair (45/100, worse than 65% of steel grades); weldability fair (40/100); formability not recommended (10/100).
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. GX15CrMo5 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with GX15CrMo5
Is GX15CrMo5 easy to machine?
Machine in the N+T or annealed condition with rigid setups and coated carbide at moderate speed; Cr carbides are abrasive and skin/scale should be removed first.
Can GX15CrMo5 be welded?
P-No.5B material — use matching 5Cr-0.5Mo (E502/ER80S-B6) filler, 200–300 °C preheat with interpass control and mandatory PWHT at 700–750 °C to avoid hard martensite and delayed cracking.
Can GX15CrMo5 be formed, bent or molded?
Supplied as sand/investment castings; design generous fillets and risers, control section transitions and always heat treat, since as-cast structure is brittle.
GX15CrMo5 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: 0.12–0.19; ASTM A217 C5: 0.20 max | 0.12 – 0.2 | 0.16 |
| SiEN limit 0.60 max | ≤ 0.75 | 0.45 |
| Mn | 0.4 – 0.7 | 0.55 |
| PEN 10213: 0.025 max | ≤ 0.04 | 0.02 |
| SEN 10213: 0.020 max | ≤ 0.05 | 0.02 |
| CrEN 10213: 4.0–6.0 | 4 – 6.5 | 5 |
| Mo | 0.45 – 0.65 | 0.55 |
| Niresidual | ≤ 0.5 | 0.2 |
| Fe | balance |
What surface finishes work on GX15CrMo5?
Shot blast and prime or use high-temperature aluminium/silicone paint; for oxidizing service above 600 °C consider aluminizing — no anodizing possible.
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 GX15CrMo5 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- ASTM
- A217 Gr. C5
- EN / DIN / Werkstoff-Nr.
- 1.7365
How much does GX15CrMo5 cost?
GX15CrMo5 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.
GX15CrMo5 — frequently asked
What is GX15CrMo5 used for?
GX15CrMo5 is typically used for high-temperature valve bodies, petrochemical pressure castings and furnace and boiler fittings. In short: A217 C5 heat-resistant casting; oxidation resistance to 620 °C; 5Cr step above WC6.
What is the yield strength of GX15CrMo5?
GX15CrMo5 has a typical yield strength of 480 MPa (69.6 ksi) and a tensile strength of 680 MPa (98.6 ksi) — stronger than 59% of steel grades. Strength varies by condition: see the 4 listed tempers.
Is GX15CrMo5 easy to machine?
Reasonably — machinability is rated fair (45/100, worse than 65% of steel grades). Machine in the N+T or annealed condition with rigid setups and coated carbide at moderate speed; Cr carbides are abrasive and skin/scale should be removed first.
Can GX15CrMo5 be welded?
With care — weldability is rated fair (40/100). P-No.5B material — use matching 5Cr-0.5Mo (E502/ER80S-B6) filler, 200–300 °C preheat with interpass control and mandatory PWHT at 700–750 °C to avoid hard martensite and delayed cracking.
What surface finishes work on GX15CrMo5?
Shot blast and prime or use high-temperature aluminium/silicone paint; for oxidizing service above 600 °C consider aluminizing — no anodizing possible.
Can GX15CrMo5 be formed, bent or molded?
Supplied as sand/investment castings; design generous fillets and risers, control section transitions and always heat treat, since as-cast structure is brittle.
What is the maximum service temperature of GX15CrMo5?
GX15CrMo5 is rated for continuous use to about 620°C (1,148 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between GX15CrMo5 N+T and GX15CrMo5-ANN?
N+T is the default condition — standard supply condition for pressure castings — balanced strength, creep resistance and 27 J minimum impact energy. ANN: softest condition for heavy rough machining or major weld repair; must be re-normalized and tempered before pressure service. Yield strength is 480 MPa in N+T versus 340 MPa in ANN.
How much does GX15CrMo5 cost?
GX15CrMo5 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 — Martensitic Stainless and Alloy Steel Castings for Pressure-Containing Parts for High-Temperature Service (Gr. C5) — ASTM International (2021)
- EN 10213 — Steel castings for pressure purposes (GX15CrMo5, 1.7365) — CEN (2016)
- GB/T 16253 / JB/T 5263 ZG15Cr5Mo (2019)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- ASME BPVC Section II Part D — physical property tables for 5Cr-0.5Mo — ASME (2023)
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.