Steel A182 F5a
ASTM A182 F5a · UNS K42544
ASTM A182 F5a (UNS K42544) is a higher-carbon variant of the 5Cr-0.5Mo forging steel F5, giving increased hardenability and mechanical strength for hot-service components.
Reference datasheet — A182 F5a 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 F5a tempers and conditions
A182 F5a is supplied in 3 conditions, soft to hard. N+T is the default FabDigit quotes; the values on this page are for it.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Solution annealed | Softest condition for heavy machining or cold sizing before final N+T or Q&T heat treatment. | 390 | 600 | 27 | 180 HB | — |
N+TDefault Normalized and tempered | Standard supply condition for A182 F5a forged flanges, valve bodies and fittings in high-temperature refinery service. | 480 | 690 | 24 | 19 HRC | — |
Quenched and tempered | Choose for heavy sections or where the highest strength and uniform through-thickness properties are needed. | 585 | 760 | 22 | 22 HRC | — |
Supply forms, finishes and certifications
Ways A182 F5a is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
NACE | NACE / MR0175 hardness-controlled | Certification |
What is A182 F5a?
ASTM A182 F5a (UNS K42544) is a higher-carbon variant of the 5Cr-0.5Mo forging steel F5, giving increased hardenability and mechanical strength for hot-service components. In the quenched-and-tempered default condition it provides 480 MPa yield, 690 MPa tensile, 24% elongation and about 215 HB (19 HRC), with service to 600 °C, and is stocked in annealed, N+T, Q+T and NACE conditions for flanges and valve bodies. The added carbon lowers machinability (about 48% of AISI 1212) and weldability, with P-No. 5B Group 1 rules requiring 200–300 °C preheat and 705–760 °C PWHT; use standard F5 where weld volume is high. A182 F5a has a density of 7.78 g/cm³ (0.281 lb/in³), lighter than 91% of steel grades. It melts at 1,450°C (2,642 °F). A182 F5a has a yield strength of 480 MPa (69.6 ksi) and a tensile strength of 690 MPa (100 ksi) — stronger than 59% of steel grades. Elongation at break is 24% and the elastic modulus is 207 GPa (30 Msi).
What is A182 F5a used for?
- High-strength hot-service flanges
- Refinery valve bodies
- Forged fittings for reformer piping
- Pressure-retaining bonnets and covers
- Bolted closures on hot piping
- Heat exchanger channel forgings
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
A182 F5a properties
Typical room-temperature values for A182 F5a-N+T; bars are the position among steel grades.
Physical3
A182 F5a has a density of 7.78 g/cm³ (0.281 lb/in³), lighter than 91% of steel grades. It melts at 1,450°C (2,642 °F).
Mechanical16
A182 F5a has a yield strength of 480 MPa (69.6 ksi) and a tensile strength of 690 MPa (100 ksi) — stronger than 59% of steel grades. Elongation at break is 24% and the elastic modulus is 207 GPa (30 Msi).
Thermal6
A182 F5a is rated for continuous service to 600°C (1,112 °F). It conducts heat at 36 W/m·K (20.8 BTU/hr·ft·°F), worse than 73% of steel grades. Thermal expansion is 11.8 µm/m·K (6.56 µin/in·°F).
Electrical2
A182 F5a has an electrical resistivity of 5.5×10⁻⁷ Ω·m.
Chemical & Environmental2
Corrosion resistance is poor (25/100), better than 92% of steel grades.
Sustainability4
Producing a kilogram of A182 F5a takes about 32 MJ of energy and emits 2.4 kg of CO₂ — more than 70% of steel grades. Typical recycled content is 30%.
Manufacturability7
A182 F5a's machinability is fair (48/100, worse than 57% of steel grades); weldability fair (40/100); formability poor (30/100).
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 F5a is highlighted; hover a dot for its name, or open the interactive family chart.
Working with A182 F5a
Is A182 F5a easy to machine?
Machines like a medium-hard alloy steel at ~50 % of 1212; use rigid setups, carbide inserts and moderate speeds, and rough in the annealed state where possible.
Can A182 F5a be welded?
P-No.5B Group 1: preheat 200–300 °C, low-hydrogen 5Cr-0.5Mo filler (E8015-B6 / ER80S-B6), maintain interpass and apply PWHT at 705–760 °C.
Can A182 F5a be formed, bent or molded?
Hot forge at 1050–1200 °C with slow cooling to avoid quench cracking; cold forming is impractical beyond minor straightening.
A182 F5a 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 |
|---|---|---|
| Chigher than F5 (0.15 max), source of extra hardenability | ≤ 0.25 | 0.2 |
| Mn | ≤ 0.6 | 0.45 |
| P | ≤ 0.03 | 0.02 |
| S | ≤ 0.03 | 0.01 |
| Si | ≤ 0.5 | 0.3 |
| Cr | 4 – 6 | 5 |
| Mo | 0.45 – 0.65 | 0.55 |
| Ni | ≤ 0.5 | 0.2 |
| Fe | balance | — |
What surface finishes work on A182 F5a?
Not anodizable — protect with phosphate + high-temperature paint, aluminizing or thermal spray; grit-blast and prime promptly since bare surfaces rust quickly.
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 F5a in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- K42544
How much does A182 F5a cost?
A182 F5a 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 F5a — frequently asked
What is A182 F5a used for?
A182 F5a is typically used for high-strength hot-service flanges, refinery valve bodies, forged fittings for reformer piping, pressure-retaining bonnets and covers, bolted closures on hot piping and heat exchanger channel forgings. In short: higher-strength F5 variant; 215 HB hot-service forgings; demanding preheat and PWHT.
What is the yield strength of A182 F5a?
A182 F5a has a typical yield strength of 480 MPa (69.6 ksi) and a tensile strength of 690 MPa (100 ksi) — stronger than 59% of steel grades. Strength varies by condition: see the 3 listed tempers.
Is A182 F5a easy to machine?
Reasonably — machinability is rated fair (48/100, worse than 57% of steel grades). Machines like a medium-hard alloy steel at ~50 % of 1212; use rigid setups, carbide inserts and moderate speeds, and rough in the annealed state where possible.
Can A182 F5a be welded?
With care — weldability is rated fair (40/100). P-No.5B Group 1: preheat 200–300 °C, low-hydrogen 5Cr-0.5Mo filler (E8015-B6 / ER80S-B6), maintain interpass and apply PWHT at 705–760 °C.
What surface finishes work on A182 F5a?
Not anodizable — protect with phosphate + high-temperature paint, aluminizing or thermal spray; grit-blast and prime promptly since bare surfaces rust quickly.
Can A182 F5a be formed, bent or molded?
Hot forge at 1050–1200 °C with slow cooling to avoid quench cracking; cold forming is impractical beyond minor straightening.
What is the maximum service temperature of A182 F5a?
A182 F5a 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 A182 F5a N+T and A182 F5a-A?
N+T is the default condition — standard supply condition for A182 F5a forged flanges, valve bodies and fittings in high-temperature refinery service. A: softest condition for heavy machining or cold sizing before final N+T or Q&T heat treatment. Yield strength is 480 MPa in N+T versus 390 MPa in A.
How much does A182 F5a cost?
A182 F5a 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 — ASTM International (2022)
- ASME BPVC Section II Part D — Material Properties — 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)
- ANSI/NACE MR0175 / ISO 15156 — Materials for use in H2S-containing environments — NACE/ISO (2020)
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.