Material:Gr1 Gr2 Gr5 Standard: ASTM B348/GBT 2965, AMS4928, F67, F136, Size:Dia100*40mm,100*45mm,98*40mm,95*40mm,80*50mm Material:Gr.1, Gr.2, Gr.3, Gr.4, Gr.5, Gr.7, Gr.9, Gr.12Standard: ASTM B348/GBT 2965, AMS4928, F67, F136, Size:Dia100*40mm, 100*45mm, 98*40mm, 95*40mm, 80*50mm, 80*45mm, 80*40mmChemical composition Standard Grade chemical composition % not more thanOther ...