1.Standard:ASTM,GB,DIN,JIS 2.WT:3.5-25mm 3.O.D.:6-630mm 4.High quality,quick delivery and competitive price 1.Product name: square steel pipe/tube2.Specification:1/2"-16"*2-25mm3.Length:4-12m4.Material: 10# 20# Q195-Q2355.Standard:ANSI,ASME GB, SH,HG, MSS,JIS,DIN, API 6.Application:petroleum, smelting, foodstuff, power,papermaking,chemical, medical equipment, aviation, boiler heat, exchanger, gas ...