Steel A182 F5a N+T
Heat-treated state · default condition
ASTM A182 F5a · UNS K42544
N+T = normalized and tempered
Standard supply condition for A182 F5a forged flanges, valve bodies and fittings in high-temperature refinery service.
Values for the N+T condition
Other A182 F5a tempers and conditions
A182 F5a is listed in 3 conditions; see the grade overview at A182 F5a.
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+TDefaultThis page 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 | — |
What is A182 F5a N+T?
A182 F5a N+T is A182 F5a heat treated to N+T — standard supply condition for A182 F5a forged flanges, valve bodies and fittings in high-temperature refinery service. A182 F5a N+T 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). A182 F5a N+T 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).
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 N+T properties
Typical room-temperature values for A182 F5a N+T; 12 are specific to this condition. Other listed values are A182 F5a reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
A182 F5a N+T 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 N+T 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 N+T 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 N+T 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 N+T 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 N+T'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. Confirm any required mill or lot documentation when quoting.
Working with A182 F5a N+T
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.
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.
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 | — |
A182 F5a N+T — frequently asked
What is A182 F5a N+T used for?
A182 F5a N+T 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 N+T?
A182 F5a N+T 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 N+T 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 N+T 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 N+T?
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 N+T 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 N+T?
A182 F5a N+T 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.
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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.