... ,159x5mm,630mmX8mm,720mmX8mm,920mmX10mm; 2. ISO, API Certification;3. per piece: about 98.50$ CS PIPESTANDARDSTEEL GRADEAPPLICATIONAPPLICATIONJ55,K55,N80,L80,P110Specification ... .A / GR.BBlack Steel PipeASTM A106GR.A / GR.BSeamless Carbon Steel For High Temperature ServiceASTM A179LOW CARBON STEELSeamless Cold-Drawn Low-Carbon Steel Heat Exchanger And ...