GB/T 223.4-2008 Alloyed steel—Determination of manganese content—Potentiometric or visual titration method

GB/T 223.5-2008 Steel and iron—Determination of acid-soluble silicon and total silicon content—Reduced molybdosilicate spectrophotometric method GB/T 223.9-2008 Iron,steel and alloy—Determination of aluminium content—Chrome azurol S photometric method GB/T 223.11-2008 Iron,steel and alloy—Determination of chromium content—Visual titration or potentiometric titration method GB/T 223.23-2008 Iron,steel and alloy—Determination of nickel content—The dimethylglyoxime spectrophotometric method GB/T 223.26-2008 Iron,steel and alloy—Determination of molybdenum content—The thiocyanate spectrophotometric method GB/T 223.29-2008 Iron,steel and alloy—Determination of lead content—Carrier precipitation-xylenol orange spectrophotometric method GB/T 223.31-2008 Iron,steel and alloy—Determination of arsenic content—Distillation-molybdenum blue spectrophotometric method GB/T 223.43-2008 Iron,steel and alloy—Determination of tungsten content—Gravimetric method and spectrophotometric method GB/T 223.55-2008 Iron,steel and alloy—Determination of tellurium content—Oscillo-polarographic method GB/T 223.59-2008 Iron,steel and alloy—Determination of phosphorus content—Bismuth phosphomolybdate blue spectrophotometric method and antimony phosphomolybdate blue spectrophotometric method GB/T 223.64-2008 Iron,steel and alloy—Determination of manganese content—Flame atomic absorption spectrometric method GB/T 223.67-2008 Iron,steel and alloy—Determination of sulfur content—Methylene blue spectrophotometric method GB/T 223.69-2008 Iron,steel and alloy—Determination of carbon contents—Gas-volumetric method after combustion in the pipe furnace GB/T 223.70-2008 Iron,steel and alloy—Determination of iron contents—o-Phenanthroline spectrophotometric method GB/T 223.72-2008 Iron,steel and alloy—Determination of sulfur content—Gravimetric method GB/T 223.73-2008 Iron,steel and alloy—Determination of iron contents—Titanium trichloride-potassium dichromate titration method GB/T 223.75-2008 Iron,steel and alloy—Determination of boron content—Methanol distillation-curcumin photometric method

GB/T 223.4-1988 Methods for chemical analysis of iron, steel and alloy The volumetric method for determination of manganese content by ammonium nitrate oxidation

ISO 385-1 ISO 648 ISO 1042 ISO 3696 ISO 4942 ISO 4947 ISO 5725-3 ISO 9647 GB/T 6379.1-2004 Accuracy(trueness and precision)of measurement methods and results—Part 1:General principles and definitions GB/T 6379.2-2004 Accuracy(trueness and precision)of measurement methods and results—Part 2:Basic method for the determination of repeatability and reproducibility of a standard measurement method GB/T 20066-2006 Steel and iron—Sampling and preparation of samples for the determination of chemical composition