Steel A182 F5
ASTM A182 F5 · UNS K41545 · EN X15CrMo5-1
ASTM A182 F5 (UNS K41545, piping equivalent A335 P5) is a 5Cr-0.5Mo martensitic low-alloy forging steel used where oxidation resistance and elevated-temperature strength are needed in refinery and petrochemical hot piping components.
Reference datasheet — A182 F5 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
A182 F5 tempers and conditions
A182 F5 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 |
|---|---|---|---|---|---|---|
full anneal / isothermal anneal for maximum machinability | Choose for rough machining of large forgings or when the lowest hardness (≤187 HB) is specified. | 310 | 520 | 28 | 160 HB | — |
N+TDefault Normalized and tempered | Standard supply condition for F5 flanges, fittings and valve bodies in refinery hot piping. | 380 | 550 | 25 | 170 HB | — |
Quenched and tempered | Used for heavy-wall valve bodies and pressure parts needing higher yield strength with tempered-martensite toughness. | 470 | 640 | 22 | 18 HRC | — |
High-strength 5Cr-0.5Mo grade | Same chemistry family but heat treated to the higher A182 F5a strength/hardness band (187–248 HB) for compact high-pressure fittings. | 520 | 690 | 24 | 21 HRC | — |
Supply forms, finishes and certifications
Ways A182 F5 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
AsForged | As-forged | Surface finish |
What is A182 F5?
ASTM A182 F5 (UNS K41545, piping equivalent A335 P5) is a 5Cr-0.5Mo martensitic low-alloy forging steel used where oxidation resistance and elevated-temperature strength are needed in refinery and petrochemical hot piping components. Typical normalized-and-tempered properties are 380 MPa yield, 550 MPa tensile, 25% elongation and about 170 HB (88 HRB), with service to 620 °C, in flanges, valve bodies and forged fittings. It is not stainless — bare surfaces rust in humid air — machinability is moderate at about 50% of AISI 1212, and welding needs 200–260 °C preheat plus 700–760 °C PWHT. Where higher strength is required, F5a is the next step up. A182 F5 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). A182 F5 has a yield strength of 380 MPa (55.1 ksi) and a tensile strength of 550 MPa (79.8 ksi) — weaker than 68% of steel grades. Elongation at break is 25% and the elastic modulus is 207 GPa (30 Msi).
What is A182 F5 used for?
- Refinery hot-service flanges
- Valve bodies
- Catalytic reformer piping fittings
Advantages
- High service temperature — 620°C (1,148 °F), better than 99% of steel grades
- Good corrosion resistance — 28/100, better than 94% of steel grades
- Ductile — tolerates forming and impact — 25%, better than 77% of steel grades
Limitations
- Low electrical conductivity — 3.8 % IACS, worse than 84% of steel grades
A182 F5 properties
Typical room-temperature values for A182 F5-N+T; bars are the position among steel grades.
Physical3
A182 F5 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
A182 F5 has a yield strength of 380 MPa (55.1 ksi) and a tensile strength of 550 MPa (79.8 ksi) — weaker than 68% of steel grades. Elongation at break is 25% and the elastic modulus is 207 GPa (30 Msi).
Thermal6
A182 F5 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 11.3 µm/m·K (6.28 µin/in·°F).
Electrical3
A182 F5 conducts electricity at 3.8 % IACS, worse than 84% of steel grades.
Chemical & Environmental3
Corrosion resistance is poor (28/100), better than 94% of steel grades.
Sustainability4
Producing a kilogram of A182 F5 takes about 34 MJ of energy and emits 2.4 kg of CO₂ — more than 82% of steel grades. Typical recycled content is 30%.
Manufacturability7
A182 F5's machinability is fair (50/100, worse than 53% of steel grades); weldability fair (45/100); formability fair (40/100).
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. A182 F5 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with A182 F5
Is A182 F5 easy to machine?
Machine in the annealed or N+T state with rigid setups, carbide tooling and moderate speeds (~60–90 m/min); the 5 % Cr gives stringy chips and work-hardened surfaces, so avoid dwelling and use ample coolant.
Can A182 F5 be welded?
Weld with matching 5Cr-0.5Mo (E8018-B6 / ER80S-B6) filler, preheat 200–260 °C, keep interpass ≥200 °C, and PWHT at 700–760 °C; slow-cool to prevent untempered martensite and hydrogen cracking.
Can A182 F5 be formed, bent or molded?
Hot forge at 1050–1180 °C with finishing above 900 °C, then normalize/temper; cold forming is limited because the alloy air-hardens.
A182 F5 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 |
|---|---|---|
| C0.15 max | ≤ 0.15 | 0.12 |
| Mn | 0.3 – 0.6 | 0.45 |
| Si | ≤ 0.5 | 0.3 |
| P | ≤ 0.03 | 0.02 |
| S | ≤ 0.03 | 0.01 |
| Cr | 4 – 6 | 5 |
| Mo | 0.44 – 0.65 | 0.55 |
| Ni0.50 max | ≤ 0.5 | 0.2 |
| Fe | balance | — |
What surface finishes work on A182 F5?
Not anodizable — protect with high-temperature aluminium/silicone paint, aluminizing or chromizing; phosphate or oil for storage since the alloy rusts in humid air.
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 A182 F5 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- K41545
- ASTM
- A335 P5
- EN / DIN / Werkstoff-Nr.
- X15CrMo5-1
How much does A182 F5 cost?
A182 F5 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.
A182 F5 — frequently asked
What is A182 F5 used for?
A182 F5 is typically used for refinery hot-service flanges, valve bodies and catalytic reformer piping fittings. In short: refinery 5Cr hot-service standard; oxidation resistance to 620 °C; weldable with strict PWHT.
What is the yield strength of A182 F5?
A182 F5 has a typical yield strength of 380 MPa (55.1 ksi) and a tensile strength of 550 MPa (79.8 ksi) — weaker than 68% of steel grades. Strength varies by condition: see the 4 listed tempers.
Is A182 F5 easy to machine?
Reasonably — machinability is rated fair (50/100, worse than 53% of steel grades). Machine in the annealed or N+T state with rigid setups, carbide tooling and moderate speeds (~60–90 m/min); the 5 % Cr gives stringy chips and work-hardened surfaces, so avoid dwelling and use ample coolant.
Can A182 F5 be welded?
With care — weldability is rated fair (45/100). Weld with matching 5Cr-0.5Mo (E8018-B6 / ER80S-B6) filler, preheat 200–260 °C, keep interpass ≥200 °C, and PWHT at 700–760 °C; slow-cool to prevent untempered martensite and hydrogen cracking.
What surface finishes work on A182 F5?
Not anodizable — protect with high-temperature aluminium/silicone paint, aluminizing or chromizing; phosphate or oil for storage since the alloy rusts in humid air.
Can A182 F5 be formed, bent or molded?
Hot forge at 1050–1180 °C with finishing above 900 °C, then normalize/temper; cold forming is limited because the alloy air-hardens.
What is the maximum service temperature of A182 F5?
A182 F5 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 A182 F5 N+T and A182 F5-F5a?
N+T is the default condition — standard supply condition for F5 flanges, fittings and valve bodies in refinery hot piping. F5a: same chemistry family but heat treated to the higher A182 F5a strength/hardness band (187–248 HB) for compact high-pressure fittings. Yield strength is 380 MPa in N+T versus 520 MPa in F5a.
How much does A182 F5 cost?
A182 F5 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 and Stainless Steel Pipe Flanges, Fittings, Valves and Parts for High-Temperature Service — ASTM International (2023)
- ASTM A335/A335M — Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service (Grade P5) — ASTM International (2022)
- ASME BPVC Section II Part D — Material Properties (Metric) — 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.