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CEN EN 2236 Pins, Headed, Close Tolerance Shank, in Alloy Steel - Technical Specification CNIS GB/T 227-91 Tool steel--Method of hardenability test CNIS GB/T 13314-91 General specifications of forged steel working rolls for cold rolling CNIS GB/T 4162-91 Forged and rolled steel bars--Method for ultrasonic examination CNIS GB/T 4697-91 Hot-rolled U-type steel for mine timbering CNIS GB/T 6402-91 Steel forgings--Method for ultrasonic examination CEN EN 29658 Steel - Determination of aluminium content - Flame atomic absorption spectromet... CNIS GB/T 325-91 Packing container steel drum CNIS GB/T 13252-91 Packing containers--Steel pails CNIS GB/T 13238-91 Cupper-steel clad plates CNIS GB/T 2970-91 Thicker steel plate--Method for ultrasonic inspection CNIS GB 13236-91 Dip-tapes and steel strapping tapes for Petroleum-Specification CNIS GB/T 710-91 Hot-rolled quality carbon structural steel sheets and strips CNIS GB/T 13237-91 Cold-rolled quality carbon structural steel shects and strips CEN EN 2103-1 Steel, Nickel Base and Cobalt Base Alloy Remelting Stock and Castings - Technic... CEN EN 2103-3 Steel, Nickel Base and Cobalt Base Alloy Remelting Stock and Castings - Technic... CEN EN 2103-2 Aerospace series Steel, Nickel Base and Cobalt Base Alloy Remelting Stock and C... CNIS GB/T 223.73-91 Methods for chemical analysis of iron,steel and alloy--The titanium trichloride... CNIS GB/T 223.74-91 Methods for chemical analysis of iron,steel and alloy--The combustion gravimetr... 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...