... API,etc 2-material:carbon steel, alloy steel,etc 3-seamless tee -a big manufacturer of steel pipe and pipe fitttingsDescription: Straight ... 316L,321,A234WPB,A105,16MnR,Cr5Mo,12Cr1MoVabout us Zhonghao steel pipe sales Co.,Ltd. of Cangzhou is a pipeline ... North China.The main products include: seamless steel pipe, straight seam steel pipe, spiral steel pipe, welded steel pipe, elbow, tri -elbow, different ...