ASTM American Standard Seamless Steel Pipe Main Materials： A53B、ASTM A106B、A106B，A333GR.6、API 5L GR.B、X42、X52、X60、X65、X70、10Cr9Mo1VNb、SA210A1、SA210C、SA213 T11、SA213T12、SA213-T22、SA233-T23、SA213-T91、SA213-492Etc.
