Brinell hardness (HB), Rockwell hardness (HRA, HRB, HRC) and Vickers hardness (HV) and other methods commonly used method. First, the mechanical structure and decorative stainless steel pipe imported a timber of SUS304,304L, 316,316L 201,202 1, tube: 9.5-406.4mm Thickness: 0.4-12.0 mm 2, square tube: 10 * 10-150 * 150mm thickness of 0.4-6.0mm 3, rectangular tube: 10 * 20-100 * 200mm thickness: 0.4-6.0mm 4, flower tube: 15.9-76.2mm Thickness: 1.0-1.5mm two industrial piping stainless steel pipe Standard: ASTM A312 ASTM A778 GB / T12771 Material: imported a timber of 304 304L 316 316L Specifications: φ13.72 ~ φ1000mm 304 tube (structural tube) 88.9 * 2.5MM factory direct products are used: chemical, petrochemical, water treatment piping three papermaking, food hygiene and other equipment, boilers, heat exchangers, condensers with stainless steel Executive Standard: ASTM A249 JIS G3463 or DIN 17457 Material: import level timber of 304 304L 316 316L Specifications: φ13.72 ~ φ1000mm product use in: construction HV and EHV power station boilers, construction superheated steam pipes, boiling water pipes and superheated steam locomotive boiler tubes. Fourth, the special craft inside and outside tube polishing (surface level: polished 180 #, 220 #, 240 #, 320 #, 400 #, 600 #); drawing; pickling; internal weld leveling; online glorious heat.