ASTM A182 F420
ASTM A182 F420 Stainless Steel Flanges
ASTM A182 F420 is a martensitic stainless steel grade designed for applications requiring high strength, toughness, and excellent resistance to wear and scaling at elevated temperatures. Containing around 12–14% chromium with controlled carbon levels, F420 offers better hardness and tensile strength than F410, making it ideal for demanding industrial environments such as power generation, petrochemical processing, and turbine systems.
At Emirerri Steel, we manufacture and export ASTM A182 F420 stainless steel flanges and forged fittings that ensure reliable performance under high pressure, mechanical stress, and corrosive conditions.
Key Features
Superior mechanical strength and hardness
Good resistance to corrosion and oxidation
Excellent wear and erosion resistance
Can be hardened and tempered for specific mechanical requirements
Reliable performance at elevated temperatures
Good machinability and weldability with proper heat treatment
Type of Flanges ASTM A182 F420
Specification
| Specification | Details |
|---|---|
| Standard | ASTM A182 / ASME SA182 |
| Grade | F420 |
| Material Type | Martensitic Stainless Steel |
| Manufacturing Process | Forged / Rolled |
| Forms | Flanges, Fittings, Valves, Forged Components |
| Pressure Class | 150#, 300#, 600#, 900#, 1500#, 2500# |
| Size Range | ½” to 48” (DN15 – DN1200) |
| Dimensions | ASME B16.5, B16.47, DIN, EN, JIS, GOST |
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| UNS | S42000 |
| EN | X20Cr13 / X30Cr13 |
| DIN | 1.4021 / 1.4028 |
| JIS | SUS420J1 / SUS420J2 |
| BS | 420S37 |
Available Sizes
Flanges: ½” NB to 48” NB
Forged Fittings: ⅛” to 4”
Customized sizes available as per project requirement
Chemical Composition
| Element | Percentage (%) |
|---|---|
| Carbon (C) | 0.15 – 0.40 |
| Manganese (Mn) | 1.00 max |
| Silicon (Si) | 1.00 max |
| Phosphorus (P) | 0.040 max |
| Sulfur (S) | 0.030 max |
| Chromium (Cr) | 12.00 – 14.00 |
| Nickel (Ni) | 0.75 max |
| Iron (Fe) | Balance |
Mechanical Properties
| Property | Unit | Value |
|---|---|---|
| Tensile Strength | MPa | 620 min |
| Yield Strength (0.2% Proof) | MPa | 345 min |
| Elongation | % | 15 min |
| Hardness (Annealed) | BHN | 217 max |
| Hardness (Hardened) | BHN | 400 – 450 |
| Impact Toughness | J | 30 (typical) |
Physical Properties
| Property | Unit | Value |
|---|---|---|
| Density | g/cm³ | 7.75 |
| Melting Point | °C | 1450 – 1510 |
| Thermal Conductivity | W/m·K | 24.9 |
| Electrical Resistivity | µΩ·m | 0.60 |
| Modulus of Elasticity | GPa | 200 |
Corrosion Resistance
ASTM A182 F420 exhibits moderate corrosion resistance in fresh water, steam, mild alkalis, and weak organic acids. However, it is less resistant to chloride-bearing and highly acidic environments compared to austenitic grades. The alloy performs best in conditions where hardness and wear resistance are critical.
Heat Resistance
F420 stainless steel provides excellent scaling resistance up to 650°C (1200°F) and maintains mechanical strength at high temperatures. It is well-suited for heat exchanger components, steam turbine parts, and thermal power plant applications.
Heat Treatment
Annealing: 840–900°C (1545–1650°F), air or furnace cool
Hardening: 980–1040°C (1800–1900°F), followed by oil or air quenching
Tempering: 150–400°C (300–750°F) based on hardness and strength requirement
Proper heat treatment enhances strength, toughness, and corrosion resistance.
Welding
ASTM A182 F420 can be welded using TIG, MIG, or shielded metal arc welding methods. Preheating at 200–300°C is recommended before welding, followed by post-weld heat treatment to restore ductility and corrosion resistance. Use of matching filler metals (AWS E410, E420) is suggested for best results.
Fabrication
F420 stainless steel is readily forged between 950°C and 1200°C and can be machined efficiently in its annealed condition. Slow uniform cooling is necessary after forging to prevent cracking. Machined surfaces should be polished to maintain corrosion resistance.
Applications
Steam Turbine Blades & Shafts
Pump and Valve Components
Oil & Gas Equipment
Heat Exchangers and Pressure Vessels
Petrochemical Processing Units
Cutlery and Blades
Automotive and Power Generation Components
Fasteners and Bolts