ASTM A182 F1
ASTM A182 F1 Alloy Steel Forged Fittings & Flanges
ASTM A182 F1 is a low-alloy steel grade primarily containing chromium and molybdenum (0.5% Mo). It is widely used for forged flanges, fittings, valves, and high-pressure piping components. The grade offers moderate strength, good ductility, and enhanced resistance to corrosion and high-temperature environments.
F1 is preferred in refinery, power generation, petrochemical, and boiler applications, where stable performance under higher temperatures and pressures is essential. Its excellent weldability and ease of fabrication make it a versatile material for various industrial systems.
Key Features
Excellent weldability and machinability
Good high-temperature strength
Enhanced resistance to oxidation and scaling
Suitable for moderate pressure and temperature services
Good toughness and ductility
Reliable performance in steam, oil, and gas environments
Specification
| Property | Details |
|---|---|
| Grade | ASTM A182 F1 |
| UNS | K12822 |
| Material | 0.5% Cr–0.5% Mo Alloy Steel |
| Standard | ASTM A182 / ASME SA182 |
| Classes | 150, 300, 600, 900, 1500, 2500 |
| Product Forms | Flanges, Fittings, Rings, Bars, Valves |
| Manufacturing | Forged / Rolled / Heat Treated |
| Condition | Annealed / Normalized & Tempered |
| Size Range | ½” to 48” (varies by product) |
Equivalent Grades
| Standard | Grade |
|---|---|
| ASME | SA182 F1 |
| UNS | K12822 |
| WNR | 1.5415 |
| EN | 16Mo5 (Similar) |
| BS | 3603-622-310 (Approx.) |
Available Sizes
Flanges
½” to 48”
Class 150–2500
Forged Fittings
½” to 4”
3000#, 6000#, 9000#
Bars & Shafts
20mm to 500mm diameter
Custom Forgings
Blocks, rings, discs, special-machined components
Chemical Composition
| Element | Percentage (%) |
|---|---|
| Carbon (C) | 0.05 – 0.15 |
| Manganese (Mn) | 0.30 – 0.60 |
| Silicon (Si) | 0.10 – 0.50 |
| Chromium (Cr) | 0.30 – 0.60 |
| Molybdenum (Mo) | 0.45 – 0.65 |
| Phosphorus (P) | ≤ 0.025 |
| Sulfur (S) | ≤ 0.025 |
Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 380 MPa (Min) |
| Yield Strength | 205 MPa (Min) |
| Elongation | 20% (Min) |
| Hardness | ≤ 170 HB |
| Impact Strength | Good at room and moderate temperatures |
Physical Properties
| Property | Value |
|---|---|
| Density | 7.80 g/cm³ |
| Melting Point | 1420–1460°C |
| Thermal Conductivity | ~46 W/m·K |
| Modulus of Elasticity | 200 GPa |
| Specific Heat | 460 J/kg·K |
Types
1. Forged Flanges
Weld Neck Flange
Blind Flange
Slip-On Flange
Socket Weld Flange
Threaded Flange
Lap Joint Flange
RTJ Flange
Orifice Flange
2. Forged Fittings
45° / 90° Elbow
Tee (Equal / Reducing)
Cross
Coupling
Union
Cap & Plug
Swage Nipple
3. Custom Forgings
Rings
Bars
Shafts
Discs
Blocks
Corrosion Resistance
ASTM A182 F1 offers:
Moderate resistance to atmospheric corrosion
Good oxidation resistance in steam environments
Suitable for mildly corrosive oil & gas media
Performs well in refinery and petrochemical service
Not recommended for high-chloride environments or strong acids.
Heat Resistance
Stable performance up to 450–500°C
Good resistance to scaling and oxidation
Adequate strength for moderate high-temperature applications
Suitable for heat exchanger and boiler components
Heat Treatment
| Process | Temperature |
|---|---|
| Annealing | 900–950°C |
| Normalizing | 900–940°C |
| Tempering | 540–700°C |
| Hardening | Not applicable |
| PWHT after welding | 650–750°C |
Welding
F1 is easily weldable using:
GTAW / TIG
GMAW / MIG
SMAW
SAW
Welding Requirements
Preheat: 100–200°C
Interpass temperature control needed
PWHT recommended to avoid hardness buildup
Use low-hydrogen welding consumables
Fabrication
Highly formable and forgeable between 900–1200°C
Good machinability after annealing
Suitable for custom-shaped forgings
Maintains structural stability during heavy processing
Applications
Oil & Gas refineries
Power plants
Petrochemical industry
Heat exchanger systems
Boiler tubes and headers
Steam pipelines
Pressure vessels
Processing equipment for moderate temperatures