1. Internal Sliding Type: The insulation structure consists of the working steel pipe, aluminum silicate, friction reduction layer, microporous calcium silicate, thermal insulation layer, stainless steel fastening steel belt, aluminum foil reflective laye

1. Internal Sliding Type: The insulation structure consists of the working steel pipe, aluminum silicate, friction reduction layer, microporous calcium silicate, thermal insulation layer, stainless steel fastening steel belt, aluminum foil reflective laye

1. Inner steel pipe2. Zinc-rich primer3. Sliding guide bracket4. High-temperature resistant glass wool5. Aluminum foil reflective layer6. Air insulation layer7. Outer steel pipe8. Anti-corrosion layer of outer steel pipe

1. Inner steel pipe2. Zinc-rich primer3. Sliding guide bracket4. High-temperature resistant glass wool5. Aluminum foil reflective layer6. Air insulation layer7. Outer steel pipe8. Anti-corrosion layer of outer steel pipe

1. During the forming process, the steel plate deforms uniformly, with low residual stress, and no surface scratches. The manufactured spiral steel pipes offer greater flexibility in diameter and wall thickness specifications, especially in producing high