Blend steel welding of flanges is allowed. Long neck flange should conform to related stipulations of GB 150.
法兰允许用钢板拼接焊制，对长颈法兰应符合GB 150的有关规定。
The long neck flange should have stress-relief heat treatment after welding.
拼接法兰应进行焊后消除应力热处理。
The long neck flange should have stress-relief heat treatment after welding.
拼接法兰应进行焊后消除应力热处理。
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