... purpose of seamless steel pipe ASTM A53GR.B: SA53B, grades, specifications:1/ 4" -28", 13.7-711.2mm 2 ... pipe for high temperature operation of 2ASTM A106GR.B: SA106B, grades, specifications: 1/ 4" -28", 13.7-711.2mm ... 3 line pipe steel API SPEC5L: B specifications: 1/ 4" -28", 13.7-711.2mm 4 ASTM ... A106/ A53/ API5L: B GR.B, grades, specifications: 1/ 4" -28", 13.7-711.2mm The ...