API 6D welding neck flange,stainles steel
Jeasin Valve Industry Co.,Ltd
Flanges, API 6D welding neck flange, stainles steel welding neck flange,
Requirements of the production level and technology welding flange corresponding requirements shall be in accordance with JB4726-4728, for production and processing according to certain standards, ensure the production and processing of products meet national quality standards.
1 nominal pressure PN 0.25MP-1.0MPa carbon steel, austenitic stainless steel butt welding flange to allow the use of class Ⅰ forgings.
2 except as specified, nominal pressure PN is welded flange 1.6MPa-6.3MPa should meet the grade Ⅱ or more forging level requirements.
3 meets one of the following conditions, should be consistent with the requirements of forgings and:
(1) the nominal pressure PN ≥ 10.0MPa flange forgings;
(2) the nominal pressure PN>4.0MPa chrome molybdenum steel forgings;
(3) the nominal pressure of PN>1.6MPa and the working temperature ≤ -20 degrees Celsius ferritic steel forgings.
Butt welding neck flange, hubbed flange, socket welding flange and threaded flange by forging or rolling process. When using the steel sheet or steel manufacturing, must meet the following requirements:
1 the use of steel shall be after a certain standard before use, the plates should be by ultrasonic inspection, no delamination defects, performance and ensure the quality of production and processing;
2 should be along the rolling direction cut into strips, the bending welded into a ring, and the steel surface forming a ring cylinder. The steel plate directly machined into the neck flange shall be;
Butt weld 3 ring should be full penetration weld;
Butt weld 4 ring should be carried out after welding heat treatment, and 100% radiographic or ultrasonic flaw detection, and ray flaw detection with II class JB4730 requirements, ultrasonic testing in accordance with JB4730 I level requirements.
API 6D welding neck flange
, stainles steel welding neck flange
, welding neck flange