tubo dell'intelaiatura
Spec. 5CT J55 \ K55 \ N80 \ L80 \ P110 \ Q125 (LTC) di api, (STC), (BTC)
Spec. 5L di API
PSL 1: A25 \ A \ B \ X42 \ X46 \ X52 \ X56 \ X60 \ X65 \ X70 \ 80
PSL 2: B \ X42 \ X46 \ X52 \ X56 \ X60 \ X65 \ X70 \ X80
ASTM A106 GR.A \ B \ C
ASTM A53 GR.A \ B
DIN1629
JIS G3454
ASTM A192 \ A210 \ A179
DIN17175
JIS G3455
ASTM A213
JIS G3456
China