ASTM A182 F321 Forged Socket Weld Fittings Manufacturer, Supplier, Exporter & Stockist in india
ASTM A182 F321 is a standard specification that covers forged or rolled alloy and stainless steel pipe fittings designed for use in high-temperature and corrosive service environments. The primary material used in the construction of these fittings is stainless steel alloy 321, which is a stabilized austenitic stainless steel containing titanium. The presence of titanium in the alloy helps prevent sensitization and enhances its resistance to intergranular corrosion. The specification outlines stringent chemical composition requirements to ensure the desired material characteristics. This includes limits on the content of various elements, such as carbon (C), manganese (Mn), phosphorus (P), sulfur (S), silicon (Si), chromium (Cr), nickel (Ni), and titanium (Ti). These limits are carefully defined to maintain the corrosion resistance and mechanical properties of the fittings.
ASTM A182 F321 also specifies important mechanical properties that the fittings must meet, including a minimum tensile strength of 75 ksi (515 MPa), a minimum yield strength of 30 ksi (205 MPa), a minimum elongation of 35%, a minimum reduction of area of 50%, and a maximum hardness of 90 HRB. These properties ensure that the fittings can withstand the mechanical stresses and pressures encountered in various applications. Heat treatment requirements may be specified to achieve the desired mechanical properties and to ensure proper metallurgical characteristics of the material. The standard also calls for appropriate marking of the fittings, including the manufacturer's name or trademark, material designation, and size.
ASTM A182 F321 Forged Socket Weld Fittings Specification
| Specification Name | ASTM A182 F321 |
| Scope | Forged or rolled alloy and stainless steel pipe fittings for high-temperature and corrosive service. |
| Materials | Stainless steel alloy 321 (stabilized austenitic stainless steel with titanium). |
| Chemical Composition | - Carbon (C): 0.08 max<br>- Manganese (Mn): 2.00 max<br>- Phosphorus (P): 0.045 max<br>- Sulfur (S): 0.030 max<br>- Silicon (Si): 0.75 max<br>- Chromium (Cr): 17.0 - 19.0<br>- Nickel (Ni): 9.0 - 12.0<br>- Titanium (Ti): 5(C+N) min - 0.70 max |
| Mechanical Properties | - Tensile Strength: 75 ksi (515 MPa) min<br>- Yield Strength: 30 ksi (205 MPa) min<br>- Elongation: 35% min<br>- Reduction of Area: 50% min<br>- Hardness: 90 HRB max |
| Heat Treatment | May specify heat treatment requirements. |
| Marking | Manufacturer's name or trademark, material designation, and size. |
| Testing | Various tests, including chemical analysis, mechanical testing, and non-destructive testing (e.g., ultrasonic examination, radiographic inspection). |
| Dimensions | Provides dimensional requirements for various types of fittings. |
| Pressure Ratings | Designed for different pressure ratings based on type and size of fittings. |
| Applications | Commonly used in high-temperature and corrosive environments, such as chemical, petrochemical, and power generation industries. |
In addition to material and mechanical requirements, the specification may provide dimensional standards for different types of fittings, including socket weld and threaded fittings. It also addresses pressure ratings, as these fittings are designed to operate at different pressure levels depending on their type and size. ASTM A182 F321 fittings find application in industries where high-temperature and corrosion resistance are crucial, including chemical processing, petrochemical, and power generation. These fittings play a critical role in ensuring the integrity and reliability of piping systems in demanding service conditions.
Chemical Composition of ASTM A182 F321 Forged Socket Weld Fittings
| Element | Composition Range (%) |
| Carbon (C) | 0.08 max |
| Manganese (Mn) | 2.00 max |
| Phosphorus (P) | 0.045 max |
| Sulfur (S) | 0.030 max |
| Silicon (Si) | 0.75 max |
| Chromium (Cr) | 17.0 - 19.0 |
| Nickel (Ni) | 9.0 - 12.0 |
| Titanium (Ti) | 5(C+N) min - 0.70 max |
Mechanical Property of ASTM A182 F321 Forged Socket Weld Fittings
| Property | Value |
| Tensile Strength | 75 ksi (515 MPa) min |
| Yield Strength | 30 ksi (205 MPa) min |
| Elongation | 35% min |
| Reduction of Area | 50% min |
| Hardness | 90 HRB max |
Applications & Uses of Pipe
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