Technical requirements for titanium flange forgings (including forged and rolled parts)
Technical requirements for titanium flange forgings (including forged and rolled parts)
1、 The level and technical requirements of forgings (including forged and rolled parts) should comply with the corresponding requirements of JB4726-4728.
1. Carbon steel and austenitic stainless steel forgings with a nominal pressure PN of 0.25MP-1.0MPa are allowed to use Grade I forgings.
2. Except as specified below, forgings with a nominal pressure PN of 1.6MPa-6.3MPa shall meet the requirements for forging grades II or above.
3. Those who meet one of the following conditions shall meet the requirements of III and forgings:
(1) Forgings for flanges with a nominal pressure PN ≥ 10.0MPa;
(2) Chromium molybdenum steel forgings with a nominal pressure PN>4.0MPa;
(3) Ferritic steel forgings with nominal pressure PN>1.6MPa and working temperature ≤ -20 degrees Celsius.
2、 Neck butt welding, neck flat welding, socket welding, and threaded flanges are generally made using forging or forging processes. When using steel plates or profiles for manufacturing, the following requirements must be met:
1. The steel plate should undergo ultrasonic testing and have no delamination defects;
2. The steel should be cut into strips along the rolling direction, bent and welded into circular rings, and the surface of the steel should form a circular cylindrical surface. Steel plates shall not be directly machined into neck flanges;
3. The butt weld of the circular ring should use a full penetration weld;
4. The butt weld of the circular ring should undergo post weld heat treatment and undergo 100% radiographic or ultrasonic testing, and the radiographic testing should meet the Class II requirements of JB4730, while the ultrasonic testing should meet the Class I requirements of JB4730.
