sell spiral steel pipe Q235 standard:API,ASTM,ASME,ANSI,JIS,DIN,BS,GB,ISO material:API 5L, A53,A106,A333 GR6,Q235,Q345 sell spiral steel pipe Q235 SSAW (Spiral Submerged-arc Welded) Quality standard: API 5L Gas and petroleum pipelines GB/T9711 Petroleum and natural gas industries--Steel pipe for pipelinesSY/T5037 Spiral submerged arc-welded steel pipe for pipelines for low pressure field fluid ...