B16.9 Buttweld Fittings ASTM A403 WP304 Stainless Steel Lap Joint Stud Ends

ASME B16.9 Buttweld Pipe Fittings , ASTM A403 WP304 Stainless Steel Lap Joint Stud Ends


A stub end is a short piece of pipe with a flange on one end and a lap joint on the other. It is designed to be used with a matching lap joint flange and allows for easy disassembly for maintenance or inspection. Ensure that the steel stub end material matches the piping system in terms of corrosion resistance and mechanical properties. Typically made of carbon steel, alloy steel, stainless steel, or other materials to match the piping system's requirements.


Connection Process of Stub End and Flange:

• The stub end is welded to a pipe. This creates a reliable mechanical connection.
• A flange is then bolted to the stub end. A gasket is placed between the flange and stub end to ensure a tight seal.
• Bolting the flange down applies pressure, compressing the gasket and forming a leak-proof joint.

ASTM A403 WP304/304L Pipe Fittings Chemical Composition

ASTM A403 WP304/304L Pipe Fittings Mechanical Properties

Stainless Steel Buttweld Lap Joint Stub End:
ASTM A403 WP316/316L, 304/304L, 310/S, 317/L, 321, etc. DIN1.4301, DIN1.4306, DIN 1.4401, DIN 1.4404 ...
Duplex & Super Duplex Steel Buttweld Lap Joint Stub End:
ASTM A 815 UNS S31803, S32205, S32750
Carbon Steel Buttweld Lap Joint Stub End:
ASTM A234 WPB, WPHY 42, WPHY 46, WPHY 52, WPH 60, WPHY 65 & WPHY 70.
Low-Temperature Carbon Steel Buttweld Lap Joint Stub End:
ASTM A420 WPL3, A420 WPL6
Alloy Steel Buttweld Lap Joint Stub End:
ASTM A234 WP1, WP5, WP9, WP11, WP12, WP22, WP91, WP92
Nickel Alloy Buttweld Lap Joint Stub End:
ASTM B336 Nickel 200, Nickel 201, Monel 400, Inconel 800, Inconel 825, Inconel 600, Inconel 625, Inconel 601, Hastelloy C 276, Alloy 20

Applications
They are particularly beneficial in environments where the system may be subject to pressure fluctuations or frequent operational changes.

• oil and gas
• chemical processing
• water treatment
• shipbuilding