CNIS GB/T 223.12-91 Methods for chemical analysis of iron,steel and alloy--The sodium carbonate sep... CNIS GB/T 223.11-91 Methods for chemical analysis of iron,steel and alloy--The ammonium persulfate ... CNIS GB/T 223.16-91 Methods for chemical analysis of iron,steel and alloy--The chromotropic acid ph... CNIS GB/T 223.71-91 Methods for chemical analysis of iron,steel and alloy--The combustion gravimetr... CNIS GB/T 223.10-91 Methods for chemical analysis of iron,steel and alloy--The cupferron separation... CNIS GB/T 223.72-91 Methods for chemical analysis of iron,steel and alloy--The alumina chromatograp... CNIS GB/T 223.8-91 Methods for chemical analysis of iron,steel and alloy--The sodium fluoride sepa... CNIS GB/T 223.75-91 Methods for chemical analysis of iron,steel and alloy--The methanol distillatio... CNIS GB/T 13148-91 Specification for welding of stainless steel clad steel plate CNIS GB/T 13149-91 Specification for welding of titanium and titanium alloy clad steel plate CNIS GB/T 13147-91 The specification for welding of copper and copper alloy clad steel plate CNIS GB 13075-91 Periodic inspection and evaluation of welded steel gas cylinders CCTI E-502.1 Steel Ends Coined CCTI E-502.2 Steel Ends Sanitary Profile - To Purchase Call 1-800-854-7179 USA/Canada or 303-397-7... CNIS GB 13013-91 Hot rolled plain steel bars for the reinforcement of concrete CNIS GB 13014-91 Remained heat treatment ribbed steel bars for the reinforcement of concrete CNIS GB 1499-91 Hot rolled ribbed steel bars for the reinforcement of concrete CNIS GB 12971.4-91 Trolley and contact wires for electric traction--Part 4: Aluminium-steel and al... CNIS GB 12971.3-91 Trolley and contact wires for electric traction--Part 3: Aluminium and steel co... CNIS GB 12955-91 General technical conditions for steel fire door CNIS GB 13004-91 Periodic inspection and evaluation of seamless steel gas cylinders CNIS GB/T 1229-91 High strength large hexagon nuts for steel structures CNIS GB/T 1231-91 Specifications of high strength bolts with large hexagon head, large hexagon nu... CNIS GB/T 1228-91 High strength bolts with large hexagon head for steel structures