Metal materials involved: F304, F316, F304L, F316L, F317, F321, F347, F5,

1Cr13, INCONEL825, MONEL400, 08F, etc.

Standards applicable to metal sealing products

ASME B16.20 Metallic gaskets for pipe flanges

JB/T 89 Metallic ring gaskets for pipe flanges

GB/T 9113.2 Integral steel pipe flanges with ring-type joint faces

GB/T 9115.3 Steel butt-welding pipe flanges with ring-type joint faces

GB/T 9128.1 Octagonal metallic ring gaskets for steel pipe flange connections GB/T 9128.2 Oval metallic ring gaskets for steel flange connections

GB 9130 Technical conditions for metallic rings used in steel pipe flange connections

GB 1223 Test method for susceptibility to intergranular corrosion of stainless and acid-resistant steels

Performance requirements for metal sealing rings

Hardness requirements

Stainless steel metal sealing rings shall undergo solution treatment. The intergranular corrosion susceptibility test shall be conducted in accordance with Method C specified in GB 1223, “Test method for susceptibility to intergranular corrosion of stainless and acid-resistant steels.”

The surfaces of metal sealing rings shall be free from scratches, impact marks, cracks, blemishes, engraved lines, and rough-drawn defects.

The marking of metal sealing rings shall include the trademark, ring number, and material designation. The marking shall be clearly stamped using low-stress steel stamps on the outer, non-sealing contact surface of the metal sealing

ring.

Metal sealing rings shall be stored in a clean, dry, and well-ventilated warehouse to prevent contamination or damage. Rust-prone materials shall undergo rust-preventive treatment.