ASTM A182 Grade F5 (UNS K41545) is an intermediate ferritic chrome-moly low-alloy steel formulated specifically for forged components, flanges, fittings, valves, and associated pressure-retaining parts operating under high-temperature and high-pressure regimes. Standardly referred to by its nominal chemical designation of 5Cr-0.5Mo, it represents a metallurgical bridge between standard carbon steels and highly alloyed stainless steel grades.
The addition of 4.0% to 6.0% chromium imparts excellent resistance to high-temperature oxidation and scaling, while the inclusion of 0.44% to 0.65% molybdenum elevates the material's solid-solution strength and creep-rupture performance. Consequently, ASTM A182 Grade F5 is widely used for petroleum cracking loops, high-pressure steam headers, fertilizer and ammonia production piping, and critical valve bodies up to a service envelope of 595°C to 650°C (1100°F to 1200°F).
The specific chemical weight percentages based on standard heat analysis are detailed below. A crucial metallurgical distinction exists between standard ASTM A182 F5 and custom forged die blocks, which often utilize high-carbon variants to maximize room-temperature hardness at the cost of weldability.
| Element | ASTM A182 Grade F5 (UNS K41545) [%] | ASTM A182 Grade F5a (UNS K42544) [%] |
|---|---|---|
| Carbon (C) | 0.15 max | 0.25 max |
| Chromium (Cr) | 4.00 – 6.00 | 4.00 – 6.00 |
| Molybdenum (Mo) | 0.44 – 0.65 | 0.44 – 0.65 |
| Manganese (Mn) | 0.30 – 0.60 | 0.60 max |
| Silicon (Si) | 0.50 max | 0.50 max |
| Phosphorus (P) max | 0.030 | 0.040 |
| Sulfur (S) max | 0.030 | 0.030 |
For principal piping engineers, metallurgists, and procurement officers requiring granular technical specifications, stress analysis parameters, and full manufacturing tolerances for ASTM A182 F5 forged components, the complete technical datasheet is available below.
Contains empirical data for stress simulations, international regulatory compliance audits, and advanced piping configuration charts. Corporate/engineering credentials required.
⬇ DOWNLOAD DATASHEETThe mechanical parameters of ASTM A182 F5 are strongly affected by the heat treatment applied to the forged structure. Standard A182 F5 is supplied in either the annealed (Class 1) or normalized and tempered (Class 2/3 / standard forged fittings) conditions to meet specific structural demands.
| Mechanical Property | A182 F5 (Class 1 / Annealed) | A182 F5 (N+T / Q+T) |
|---|---|---|
| Ultimate Tensile Strength | ≥ 415 MPa (60 ksi) | ≥ 485 MPa (70 ksi) |
| Yield Strength (0.2% Proof) | ≥ 205 MPa (30 ksi) | ≥ 275 MPa (40 ksi) |
| Elongation in 2 in. / 4D | ≥ 20% | ≥ 20% |
| Reduction of Area (RA) | ≥ 35% | ≥ 35% |
| Brinell Hardness (HBW) | 143 – 187 | 143 – 217 |
To maintain compatibility in international procurement and multi-code engineering environments, ASTM A182 F5 is mapped to standard product forms and regional standards.
| Product Form / Standard | Equivalent Designation |
|---|---|
| Forgings & Flanges (ASTM A182) | UNS K41545 / Werkstoff 1.7362 |
| Seamless Pipes (ASTM A335) | Grade P5 / STPA 25 |
| Seamless Tubes (ASTM A213) | Grade T5 / STBA 25 |
| Pressure Castings (ASTM A217) | Grade C5 / UNS J42045 |
| European Equivalent (EN 10222-5) | 1.7362 / X12CrMo5 |
Following hot working, forgings are cooled below the martensite finish transformation temperature bounds before receiving thermal treatment:
ASTM A182 Grade F5 is classified under ASME P-Number 5A Group 1. Due to its high chromium content, the alloy exhibits significant air-hardening characteristics, requiring careful control of the thermal welding cycle.
