ASTM A105 Forged Carbon Steel Weld Neck Flanges

The Weld Neck Flange is a specialized forging characterized by a long tapered hub that is butt-welded to the pipe. This design provides superior stress distribution and resistance to dishing under internal pressure, making it the highest-integrity flange type for critical, high-pressure, and high-temperature applications. The standard material for these flanges in industrial piping is ASTM A105, which specifies Forged Carbon Steel suitable for pressure systems. The flanges are designed to mate directly with ASTM A193 Grade B7 Stud Bolts and their complementary ASTM A194 Grade 2H Heavy Hex Nuts. This entire bolted joint system (A105 flange + B7 bolt + 2H nut) is the industry standard for pipelines in power generation, chemical, and oil & gas sectors. Zeron Fasteners offers these flanges across all pressure classes (e.g., 150# to 2500#) and conforming to ASME B16.5 dimensional standards.

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ASTM A194 2H Stud Bolts ASTM A194 2H Nuts ASTM A194 2H Weld Neck Flanges SS 304L Blind Flanges Hastelloy C276 Flanges
ASTM A105 Forged Weld Neck Flanges Manufacturer in India

ASTM A105 Flanges Chemical Composition

Element Composition (Mass %)
Carbon (C) 0.35% maximum
Manganese (Mn) 0.60% to 1.05%
Phosphorus (P) 0.035% maximum
Sulfur (S) 0.035% maximum
Silicon (Si) 0.10% to 0.35%

ASTM A105 Flanges Mechanical Properties

Property Value
Size Range Minimum Value
Tensile Strength, minimum 70 ksi (485 MPa) minimum
Yield Strength, minimum 36 ksi (250 MPa) minimum
Elongation After Fracture, minimum 22% minimum

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