ASTM A193 B7M Weld Neck Flanges

The ASTM A193 B7M Weld Neck Flange (WNF) is a specialized forged pipe fitting distinguished by its long, tapered hub and gentle transition to the bore, designed to be butt-welded directly to the pipe. This configuration allows for the smooth transfer of stress from the flange to the pipe, reducing turbulence and erosion and making it ideal for severe service conditions involving high pressure, extreme temperatures, and sub-zero temperatures. Zeron Fasteners manufactures these flanges using the B7M equivalent alloy steel grade. The key feature of the B7M material is its controlled maximum hardness (the 'M' designation), which is achieved through specific heat treatment. This modification is crucial because it provides enhanced resistance to chloride stress corrosion cracking (SCC). This makes B7M Weld Neck Flanges essential in chemical processing, petrochemical, and power generation industries where safety and compliance with sour service standards (like NACE MR0175) are paramount.

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ASTM A193 B7M Weld Neck Flanges Manufacturer in India

ASTM A193 B7M Weld Neck Flanges Chemical Composition

Element Composition (% by Mass)
Carbon (C) 0.38 - 0.48
Manganese (Mn) 0.75 - 1.00
Phosphorus (P) ≤ 0.035
Sulfur (S) ≤ 0.040
Silicon (Si) 0.15 - 0.35
Chromium (Cr) 0.80 - 1.10
Molybdenum (Mo) 0.15 - 0.25

ASTM A193 B7M Weld Neck Flanges Mechanical Properties

Property Minimum Requirement (Equivalent Grade B7M)
Tensile Strength, min 100 ksi (690 MPa)
Yield Strength, min 80 ksi (550 MPa)
Elongation in 2 in. (50 mm), min 16%
Reduction of Area, min 50%
Hardness, max (Brinell) 235 HBW
Hardness, max (Rockwell) 22 HRC

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