... , 600G or 800G Mirror finishTesteddy current inspection, ultrasonic inspection, real-time imaging, hydrostatic test, spectral analysis, intergranular corrosion, water pressure ... method make it go through the ISO 9000 quality system.Wenzhou Longwan Nanyang Steel Pipe Factory is our earliest ... 300 tons. It also achieves the ISO 9000 quality system.Zhejiang Shengyang Stainless Steel Manufacture Co. Ltd is ...