ASTM A182 Grade F22 Pipe Fittings (Companion to B16 Bolting)

While ASTM A193 B16 specifies high-temperature bolting, the matching Pipe Fittings required for the same severe service conditions are commonly manufactured to the ASTM A182 Grade F22 specification. This material is a Chromium-Molybdenum (2.25% Cr) alloy steel that exhibits excellent strength and creep resistance at elevated temperatures, making it the ideal companion for B16 bolting in critical piping applications above $800^\circ\text{F}$ ($427∘C). These fittings, which include Forged Flanges, Elbows, Tees, and Reducers , are manufactured via forging to ensure maximum durability and pressure containment. F22 fittings are essential for maintaining the pressure boundary integrity in steam lines, high-pressure headers, and other equipment within thermal power plants and refineries, where the entire bolted joint assembly (fittings and fasteners) must possess superior thermal stability.

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ASTM A182 Grade F22 Pipe Fittings Chemical Composition

Element Composition (% by Mass)
Carbon (C) 0.05 - 0.15
Manganese (Mn) 0.30 - 0.60
Phosphorus (P) ≤ 0.035
Sulfur (S) ≤ 0.030
Silicon (Si) ≤ 0.50
Chromium (Cr) 2.00 - 2.50
Molybdenum (Mo) 0.90 - 1.10

ASTM A182 Grade F22 Pipe Fittings Mechanical Properties

Property Minimum Requirement (Grade F22)
Tensile Strength, min 70 ksi (485 MPa)
Yield Strength, min (0.2% offset) 40 ksi (275 MPa)
Elongation in 2 in. (50 mm), min 20%
Reduction of Area, min 30%
Hardness, max (Brinell) 217 HBW

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