6. Secondary and tertiary state representation methods of welded pipe state (W):
After the welding is refined (re-annealing, re-cold working), the welded area has become a processed structure and can use a general state code. This state representation method uses O, OS, and H as codes according to the specific situation after finishing.
WM-welded state; WO-annealed state after welding; WC-light cold working after welding; WH-cold drawing state after welding; WR-welded pipe + cold drawing + stress relief
Add two Arabic numerals after the secondary state code to form the third-level state code. The following are the third-level codes and names:
The above-mentioned two-digit Arabic numerals 00, 01, 02, 03, 04, 06, 08, and 10 represent the hardening state, which is applicable here.
The two-digit Arabic numerals added after TM are: 50, 00, 01, 02, 03, 04, 06, 08, 10, 15, 20, 21, 22, 24, and the three-level status codes and names are as follows:
TM50 - welded by annealed strip; TM00 - welded by 1/8 hard strip; TM15 - welded by annealed strip + stress relief;
TM20 - welded by 1/8 hard strip + stress relief; TM21 - welded by 1/4 hard strip + stress relief;
TM22 - welded by 1/2 hard strip + stress relief; TM24 - welded by 3/4 hard strip + stress relief
The two-digit Arabic numerals added after WO are: 50, 60, 61, and the three-level status codes and names are as follows:
WO - welding + light annealing; WO60 - welding + soft annealing; WO61 - welding + Annealing
The two-digit Arabic numeral added after WC is: 55, and its three-level state code and name are WC55-welding + light cold working
The two-digit Arabic numeral added after WH are: 00, 01, 02, 03, 04, 06, 55, 58, 60, and its three-level state code and name examples are as follows:
WH00-welding + drawing (1/8 hard); WH55-welding + cold rolling or light drawing; WH58-welding + cold rolling or conventional drawing; WH80-welding + cold rolling or hard drawing
The two-digit Arabic numeral added after WR are: 00, 01, 02, 03, 04, 06, and its three-level state code and name examples are as follows:
WR00-welding + drawing + stress relief from 1/8 hard strip; WR06-welding + drawing + stress relief from extra hard strip
