Technical Note
1.Forgings in accordance with NB/T47008-2010 "pressure equipment with carbon steel and alloy steel forgings" in grade Ⅳ provisions of manufacture, inspection and acceptance.
2.Forgings to ensure the mechanical properties and microstructure of the heat treatment, heat treatment before the transition layer in Figure welding, welding rod for the J507. Mechanical properties after heat treatment requirements should be consistent with NB/T47008-2010 "pressure equipment with carbon steel and alloy steel forgings" requirement, after finishing the transition layer is not less than 5mm.
3. Sealing surface without grooves, scratches and dents and other defects.
4. Threads on the face should be perpendicular to the axis, the vertical degree of tolerance according to the provisions of Section 10 GB/T1184-1996 accuracy.
5. Distribution along the circumference of the main bolt hole between two adjacent holes chord tolerance of ± 0.6mm, any two holes chord tolerance ± 1.5mm.
6. Bolt holes in a cross-distribution of long strings of two adjacent bolt hole tolerance ± 0.6mm, any two holes chord tolerance ± 0.6mm.
7. Thread size by GB/T196-2003 basic standard, thread tolerance requirements by GB/T197-2003 standard tolerance.
8.Threaded surface free of cracks, bumps and burrs. 9. After rough forging ultrasonic testing, the results in line with JB/T4730.3-2005 provisions Ⅱ.Forging and finishing after the magnetic transition layer, and the results meet the requirements of grade Ⅰ JB/T4730.4-2005. 10.Remaining at GB150-1998 "steel pressure vessel," the relevant provisions of the manufacturing and testing. 11.Nozzle orientation according to the drawings.
Our company is specialized in producing three or four pressure vessels and single and double tube plate manufacturers, the company through continuous self-development and innovation has been to break through the traditional tube plate processing technology, using advanced CNC machining centers, combined with independent research and development processing technology and tools to high precision, high-performance, favorable prices abroad to undertake thermal power, nuclear power, desalination, sea salt, chemical, petrochemical pressure vessels, heat exchangers, condensers, ammonia cooler, acid ethylene synthesis reactor and other types of stainless steel, carbon steel, alloy steel, titanium, aluminum, copper alloy tube diameter, high thickness plates, flanges, forgings and partitions, baffles, deep processing of composite panels business. |