Steel X15CrMo5-1
EN X15CrMo5-1 · ASTM A182 F5
X15CrMo5-1 (1.7390, ASTM A182 F5) is a 5 % Cr–1 % Mo martensitic creep-resistant alloy steel from the EN 10083/10250 quality-steel family, supplied annealed, normalised-and-tempered, quenched-and-tempered, in a bolting temper or as-forged.
Reference datasheet — X15CrMo5-1 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 NT condition
X15CrMo5-1 tempers and conditions
X15CrMo5-1 is supplied in 5 conditions, soft to hard. NT 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 |
|---|---|---|---|---|---|---|
Solution annealed | Softest condition for heavy machining or cold work before final N+T. | 330 | 550 | 26 | 170 HB | — |
NTDefault normalized ~950 °C and tempered 700–760 °C (ASTM A182 F5) | Standard stocked condition for high-temperature valves, flanges and fittings; balanced creep strength and toughness. | 470 | 660 | 22 | 15 HRC | — |
As-forged / hot rolled | Mill-supplied semi-finished bar or forging blank; properties non-uniform, always heat treated before use. | 480 | 700 | 18 | 22 HRC | 3.1 % IACS |
+QT bolting condition | Bar/rod for high-temperature studs and bolts where relaxation resistance at 480–550 °C governs. | 580 | 750 | 18 | 22 HRC | 3.1 % IACS |
Quenched and tempered | Choose when higher room-temperature strength/hardness is needed (F5a class); slightly lower toughness. | 590 | 760 | 19 | 23 HRC | — |
What is X15CrMo5-1?
X15CrMo5-1 (1.7390, ASTM A182 F5) is a 5 % Cr–1 % Mo martensitic creep-resistant alloy steel from the EN 10083/10250 quality-steel family, supplied annealed, normalised-and-tempered, quenched-and-tempered, in a bolting temper or as-forged. Engineers specify it for elevated-temperature valve bodies, flanges and forged fittings, where the default N+T condition gives 470 MPa yield, 660 MPa tensile, 22 % elongation, about 200 HB and service to 600 °C. It is not a stainless steel, so wet or corrosive duty needs paint, aluminizing or a weld overlay, and welding demands 200–300 °C preheat plus 700–760 °C PWHT. Where full oxidation resistance is required, a 9Cr-1Mo (F9/F91) grade is the nearer choice. X15CrMo5-1 has a density of 7.78 g/cm³ (0.281 lb/in³), lighter than 91% of steel grades. It melts at 1,425°C (2,597 °F). X15CrMo5-1 has a yield strength of 470 MPa (68.2 ksi) and a tensile strength of 660 MPa (95.7 ksi) — stronger than 57% of steel grades. Elongation at break is 22% and the elastic modulus is 213 GPa (30.9 Msi).
What is X15CrMo5-1 used for?
- valve bodies
- high-temperature flanges
- process piping
Advantages
- High service temperature — 600°C (1,112 °F), better than 98% of steel grades
- Good corrosion resistance — 25/100, better than 92% of steel grades
Limitations
- Low electrical conductivity — 3.1 % IACS, worse than 89% of steel grades
- High embodied carbon — 2.5 kg CO₂/kg, worse than 82% of steel grades
X15CrMo5-1 properties
Typical room-temperature values for X15CrMo5-1-NT; bars are the position among steel grades.
Physical3
X15CrMo5-1 has a density of 7.78 g/cm³ (0.281 lb/in³), lighter than 91% of steel grades. It melts at 1,425°C (2,597 °F).
Mechanical16
X15CrMo5-1 has a yield strength of 470 MPa (68.2 ksi) and a tensile strength of 660 MPa (95.7 ksi) — stronger than 57% of steel grades. Elongation at break is 22% and the elastic modulus is 213 GPa (30.9 Msi).
Thermal6
X15CrMo5-1 is rated for continuous service to 600°C (1,112 °F). It conducts heat at 37 W/m·K (21.4 BTU/hr·ft·°F), worse than 71% of steel grades. Thermal expansion is 11.5 µm/m·K (6.39 µin/in·°F).
Electrical3
X15CrMo5-1 conducts electricity at 3.1 % IACS, worse than 89% of steel grades.
Chemical & Environmental3
Corrosion resistance is poor (25/100), better than 92% of steel grades.
Sustainability4
Producing a kilogram of X15CrMo5-1 takes about 34 MJ of energy and emits 2.5 kg of CO₂ — more than 82% of steel grades. Typical recycled content is 25%.
Manufacturability7
X15CrMo5-1's machinability is fair (45/100, worse than 65% of steel grades); weldability fair (45/100); formability fair (35/100).
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. X15CrMo5-1 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with X15CrMo5-1
Is X15CrMo5-1 easy to machine?
Machine in the annealed or N+T state with rigid setups and carbide tooling; work-hardening is mild but the 5 % Cr matrix is abrasive — moderate speeds and generous coolant.
Can X15CrMo5-1 be welded?
Weldable with matching 5Cr-0.5Mo (E8018-B6 / ER80S-B6) filler; preheat 200–300 °C, maintain interpass and apply 700–760 °C PWHT to avoid hard martensite and hydrogen cracking.
Can X15CrMo5-1 be formed, bent or molded?
A hot-working grade: forge at 1100–1200 °C, finish above 900 °C, slow cool; cold forming limited to gentle bends after annealing.
X15CrMo5-1 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≤0.15 per ASTM A182 F5 | 0.1 – 0.18 | 0.15 |
| Si | ≤ 0.5 | 0.3 |
| Mn | 0.3 – 0.6 | 0.45 |
| P | ≤ 0.03 | |
| S | ≤ 0.03 | |
| Cr | 4 – 6 | 5 |
| Mosome EN listings of X15CrMo5-1 allow up to ~1.0 % Mo; confirm with mill certificate | 0.45 – 0.65 | 0.55 |
| Ni | ≤ 0.5 | |
| Fe | balance |
What surface finishes work on X15CrMo5-1?
Not stainless — protect with high-temperature aluminium paint, phosphating, aluminizing or 12Cr/Alloy 625 weld overlay for wet or corrosive 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 X15CrMo5-1 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- ASTM
- A182 F5
- EN / DIN / Werkstoff-Nr.
- 1.7390
How much does X15CrMo5-1 cost?
X15CrMo5-1 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.
X15CrMo5-1 — frequently asked
What is X15CrMo5-1 used for?
X15CrMo5-1 is typically used for valve bodies, high-temperature flanges and process piping. In short: creep-resistant 5Cr-1Mo steel; 600 °C service capability; standard valve forging grade.
What is the yield strength of X15CrMo5-1?
X15CrMo5-1 has a typical yield strength of 470 MPa (68.2 ksi) and a tensile strength of 660 MPa (95.7 ksi) — stronger than 57% of steel grades. Strength varies by condition: see the 5 listed tempers.
Is X15CrMo5-1 easy to machine?
Reasonably — machinability is rated fair (45/100, worse than 65% of steel grades). Machine in the annealed or N+T state with rigid setups and carbide tooling; work-hardening is mild but the 5 % Cr matrix is abrasive — moderate speeds and generous coolant.
Can X15CrMo5-1 be welded?
With care — weldability is rated fair (45/100). Weldable with matching 5Cr-0.5Mo (E8018-B6 / ER80S-B6) filler; preheat 200–300 °C, maintain interpass and apply 700–760 °C PWHT to avoid hard martensite and hydrogen cracking.
What surface finishes work on X15CrMo5-1?
Not stainless — protect with high-temperature aluminium paint, phosphating, aluminizing or 12Cr/Alloy 625 weld overlay for wet or corrosive service.
Can X15CrMo5-1 be formed, bent or molded?
A hot-working grade: forge at 1100–1200 °C, finish above 900 °C, slow cool; cold forming limited to gentle bends after annealing.
What is the maximum service temperature of X15CrMo5-1?
X15CrMo5-1 is rated for continuous use to about 600°C (1,112 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between X15CrMo5-1-NT and X15CrMo5-1-A?
NT is the default condition — standard stocked condition for high-temperature valves, flanges and fittings; balanced creep strength and toughness. A: softest condition for heavy machining or cold work before final N+T. Yield strength is 470 MPa in NT versus 330 MPa in A.
How much does X15CrMo5-1 cost?
X15CrMo5-1 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 A182/A182M — Forged or Rolled Alloy Pipe Flanges, Fittings, Valves (Grade F5/F5a) — ASTM International (2023)
- EN 10222-2 — Steel forgings for pressure purposes, ferritic and martensitic creep-resisting steels — CEN (2017)
- EN 10269 — Steels and nickel alloys for fasteners with specified elevated/low temperature properties — CEN (2013)
- ASME BPVC Section II Part D — Material Properties (5Cr-0.5Mo) — 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 — 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.