Stainless steel U tube has what material and standard??
Zhejiang Huatian Special materials Co., LTD has a large number of special heat exchanger tubes of GB13296-2013 standard GB/T21833-2008 standard all year round; Specifications: 38*2, 38*1.5, 32*2, 32*1.525*2.5, 25*2, 25*1.5, 19*2, 19*1.5 length up to ···