Stainless steel socket weld flange

What is Stainless steel socket weld flange?
Plate stainless steel flange made from ASTM A240 plate or cast in conformance with ASTM A351

Stainless steel socket weld flange
Product Description
304L Stainless Steel Forged 150# ANSI RF Socket Weld Flange

Specification
• Forged stainless steel material conforms to ASME A182
• Forged stainless steel flange dimensions conform to ASME B16.5
• NPT threads conform to ASME B1.20.1
• Manufacturing facility is ISO 9001:2008
• Plate stainless steel flange dimensions conform to ASME B16.5 Class 150
• Plate stainless steel flange made from ASTM A240 plate or cast in conformance with ASTM A351