... time:15-30days 4)Grade:ASTM,DIN,BS,AISI Our company supply a variety of seamless steel pipe,alloy steel pipe ... tube oil pipe, galvanied steel pipe and son on. our company specializing in the production of small diameter Oxygen blowing steel ... ,630(17-7PH) high corrosion-resistant high-strength series materials. our company operate of oil line pipe casing,not only the supply ...