GB/T 223.93-2026Iron, steel and alloy - Determination of niobium content - PAR spectrophotometric method (English PDF)
钢铁及合金 铌含量的测定 PAR分光光度法
Also coversGB/T223.93-2026 + GBT223.93-2026
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
August 28, 2026
Implementation date
March 1, 2027
Scope
GB/T 223.93-2026 is the English-translated version of 钢铁及合金 铌含量的测定 PAR分光光度法.
This standard specifies an analytical method for determining the niobium content of iron, steel and alloys, using PAR spectrophotometry. PAR is a colour-forming reagent, and the method relies on measuring light absorption to quantify niobium in a prepared sample solution. It belongs to the long-running GB/T 223 series of chemical analysis methods for iron, steel and alloys.
The users are testing laboratories at steel mills and foundries, independent inspection and certification bodies, alloy producers, research institutes, and buyers who verify material composition against specification. A published method gives laboratories a common procedure and supports comparable results between parties.
The document was issued on 28 August 2026 and takes effect on 1 March 2027. It is a recommended national standard (GB/T), so it is voluntary unless a contract or material specification requires it. Laboratory staff should consult the full text for reagents, procedure and calculation details.
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Document preview — GB/T 223.93-2026
National Standard of the People's Republic of China
- ICS
- 77.080.01
- Classification
- H 11
Issued by: State Administration for Market Regulation; Standardization Administration of China
Contents
- Foreword
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
Foreword
GB/T 223.93-2026 is a recommended national standard (GB/T) of the People's Republic of China, issued on 28 August 2026 by the State Administration for Market Regulation and the Standardization Administration of China, with effect from 1 March 2027.
It is under the responsibility of the China Iron and Steel Association.
Classification: ICS 77.080.01; CCS H 11.
1 Scope
This standard specifies an analytical method for determining the niobium content of iron, steel and alloys, using PAR spectrophotometry. PAR is a colour-forming reagent, and the method relies on measuring light absorption to quantify niobium in a prepared sample solution. It belongs to the long-running GB/T 223 series of chemical analysis methods for iron, steel and alloys.
The users are testing laboratories at steel mills and foundries, independent inspection and certification bodies, alloy producers, research institutes, and buyers who verify material composition against specification. A published method gives laboratories a common procedure and supports comparable results between parties.
The document was issued on 28 August 2026 and takes effect on 1 March 2027. It is a recommended national standard (GB/T), so it is voluntary unless a contract or material specification requires it. Laboratory staff should consult the full text for reagents, procedure and calculation details.
Remaining clauses in the full document
- 2 Normative references
- 3 Terms and definitions
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
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GB/T 223.93-2026
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