How to choose flange material for oil and gas?

Title: How to Choose Flange Material for Oil and Gas?

• A105: Carbon steel, general service, low temperature

• A350 LF2: Low-temperature carbon steel

• F11 F22: Alloy steel, high temperature & high pressure

• 304/316L: Stainless steel, corrosive environment

• Low pressure & normal temperature → A105

• High pressure & high temperature → Alloy steel

• Corrosive gas/liquid → 316L

What is MTR for flanges?

Title: What is MTR for Flanges? Why It Is Important?

• Heat number & batch

• Chemical composition (C, Si, Mn, P, S, Cr, Ni, Mo...)

• Mechanical properties (tensile strength, yield strength, elongation)

• Heat treatment

• Inspection result