的ERW钢管也被称为直连接管.According to the wall density,the bonded tube is categorized into typical types and thick-walled types.我们可以提供个性化的墙项目根据客户的厚度’particular requirement with a thickness deviation of no more than0.25 মিমি.With sizes between1/2寸,24 ইঞ্চি,our ERW steel pipes go through rigorous examinations and tests,so about make sure the welding quality,external size precision,ovality,cut lengths,pipe end quality,wall density tolerance,and packaging quality are all conforming to API5L, ASTMA53, গিগাবাইট / T9711.1,or GB/T3091 standards. […]