- Standard No.
- GB/T 223.40-2007
- Language
- Chinese, Available in English version
- Release Date
- 2007
- Published By
- General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
- Latest
-
GB/T 223.40-2007
- Replace
-
GB/T 223.39-1994
GB/T 223.40-1985
- Scope
- This part of GB/T 223 specifies the determination of niobium content by chlorosulfonol S spectrophotometry. This part applies to the determination of the content of niobium in carbon steel and low alloy steel with a mass fraction of 0.010% to 0.50%.
GB/T 223.40-2007 Referenced Document
- GB/T 20066 Steel and iron.Sampling and preparation of samples for the determination of chemical composition
- GB/T 6379.1 Accuracy(trueness and precision)of measurement methods and results Part 1:General principles and definitions
- GB/T 6379.2 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 223.40-2007 history
- 2007 GB/T 223.40-2007 Iron, steel and alloy Determination of niobium content by the sulphochlorophenol S spectrophotometric method
- 1994 GB/T 223.39-1994 Methods for chemical analysis iron,steel and alloy. The sulphochlorophenol S photometric method for the determination of niobium content
- 1985 GB/T 223.40-1985 Methods for chemical analysis of iron,steel and alloy--The anion-exchange separation-sulphochlorophenol S photometric method for the determination of niobium content
GB/T 223.40-2007 Iron, steel and alloy Determination of niobium content by the sulphochlorophenol S spectrophotometric method has been changed from GB/T 223.39-1994 Methods for chemical analysis iron,steel and alloy. The sulphochlorophenol S photometric method for the determination of niobium content.