... products include: 1. seamless steel pipes, 2. hot-finished pipes, 3. welded steel pipes, 4. pipe fittings. ItemMaterialStandardSpecification ... 2-80Temperature-resistantseamless steel pipefar high-pressure boilerSeamless pipes for petroleum 20, 12CrMo,15CrMo, Cr5Mo, ... *1.5-36Boiler pipes for refinery,heatexchangeing pipes,seamless steel pipes for pipelineHigh-pressureSeamless pipes for fertilizer making ...