YUHONG HOLDING GROUP CO.,LTD  start supply alloy steel seamless tube and pipe from 2009 , the products contain: 

ASTM A335/ A335M-2015 , ASME SA335 : P11, P12, P22, P5, P9, P91 , size from DN8 TO DN36 , wall thickness : 1mm to 70mm . Length Max.: 25m/pc 

ASTM A213  ASME SA213 : T11, T12, T22, T5, T9, T91 SMLS TUBE , size : 1/2" =12.7mm , 5/8"=15.88mm , 3/4"=19.05mm , 1"=25.4mm , 1-1/4"=31.75mm , 1-1/2"=38.1mm , 44.45MM , 45MM,  2"=50.8MM , 2-1/2"=63.5MM , 3"=76.2MM , 4"=101.6MM .   WT: 16BWG =1.65MM,  14BWG= 2.11MM , 12BWG=2.77, 10BWG=3.4MM , and other wall thickness depend on client request . Length Max.: 25m/pc . 

ASTM A182 FLANGE ,F11, F12, F22, F5, F9, F91 , FLANGE TYPE : WELD-NECK Flange , Lap Joint Flange , Blind Flange, Slip-On Flange, Thread Flange, Scoket-Weld Flange, Orifice Flange , Spectacle Flange .