... : boyu Type: ERW Steel Grade: K55,J55,N80,L80 oil casing pipe1).Size: OD42.2-244.5mm*3-14mm*5-15meter2 ... ).Grade: K55,J55,N80,L803).Standard: ASTM,API,GOST, JIS, DIN4).The period of price validity: 5 days5 ... : fluid and gas transfer, structure, boiler, heat exchange, super heater7).Supply Ability: 3500-4000 mts per month