螺旋管的知识（Knowledge of spiral tubes）.doc

螺旋管的知识（Knowledge of spiral tubes） Knowledge of the spiral tube,.Txt love a person is difficult, hate a person is more difficult, but also love and hate the most difficult person. Love can never be a balance, want to be happy in love, you must be willing to grieve! Some troubles are invented by ourselves, but we accept them as real. Chemical analysis, spiral, sodium arsenite, iron, alloy 1 range This standard specifies a low pressure fluid pipeline with spiral submerged arc welded steel pipe (hereinafter referred to as the tube) size, shape, weight, technical requirements, test method, inspection rules, coating, marking and quality certification. This standard applies to water, sewage, air, heating, steam and flammable fluid and other ordinary low pressure fluid pipeline steel pipe, also applies to similar requirements of other fluid transportation pipeline steel tube. 2 citation criteria The provisions of the following standards shall be made by reference to the standard in this document. The editions shown are valid when published in this standard. All standards will be revised, and the parties to this standard shall explore the possibility of using the latest versions of the following standards. Sampling methods for chemical analysis of GB/T 222 - 1984 steel and allowable deviation of chemical composition of finished products GB/T 223.5 - 1997 methods for chemical analysis of iron, steel and alloy determination of acid soluble silicon content by reduced molybdate photometric method GB/T 223.58 - 1987 methods for chemical analysis of iron, steel and alloy the sodium arsenite titrimetric method for the determination of manganese content GB/T 223.59 - 1987 methods for chemical analysis of iron, steel and alloy the antimony phosphorus molybdenum blue photometric method for the determination of phosphorus content GB/T 223.68 - 1997 methods for chemical analysis of iron and steel -- the potassium iodate titrimetric method for the determination of sulfur content after co