This standard specifies the grades and markings, requirements, test methods, inspection rules and markings, packaging, transportation, storage, and quality certificates of high-carbon steel strips for surface use (hereinafter referred to as "steel strips"). This standard is applicable to high-carbon steel strips with a thickness of no more than 1.0 mm and a width of no more than 50 mm for manufacturing watch parts. Steel strips for other precis on mechanical parts can also be used with reference.
GB/T 223.11 Determination of chromium content in iron, steel and alloy by visual titration or potentiometric titration
GB/T 223.23 Iron,,steel and alloy.Determination of nickel content.The dimethylglyoxime spectrophotometric method
GB/T 223.29 Iron,steel and alloy.Determination of lead content.Carrier precipitation-xylenol orange spectrophotometric method
GB/T 223.4 Alloyed steel.Determination of manganese content.Potentiometric or visual titration method
GB/T 223.5 Steel and iron.Determination of acid-soluble silicon and total silicon content.Reduced molybdosilicate spectrophotometric method
GB/T 223.53 Methods for chemical analysis of iron,steel and alloy--The flame atomic absorption spectrophotometric method for the determination of copper content
GB/T 223.61 Methods for chemical analysis of iron, steel and alloy--The ammonium phosphomolybdate volumetric method for the determination of phosphorus content
GB/T 223.68 Methods for chemical analysis of iron, steel and alloy. The potassium iodate titration method after combustion in the pipe furnace for the determination of sulfur content
GB/T 223.69 Iron,steel and alloy.Determination of carbon contents.Gas-volumetric method after combustion in the pipe furnace
GB/T 224 Determination of the depth of decarburization of steels*， 2019-06-04 Update
GB/T 228.1 Metallic materials—Tensile testing—Part 1: Method of test at room temperature*， 2021-12-31 Update
GB/T 247 General rule of package,mark and certification for steel plates(sheets)and strips
GB/T 2523 Measuring method of surface roughness, peak count and waviness for cold-rolled metal sheet and strip*， 2022-07-11 Update