GB/T 223.6-2025: Iron, steel and alloy - Determination of boron content - Neutralization titrimetric method and spectrophotometric method

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Scope

This document describes a method for determining the boron content in iron and steel
and alloys, using neutralization titration and curcumin spectrophotometric method.
The methods in this document are applicable as follows. Method One, neutralization
titration, is suitable for determining the boron content of 0.50%~2.00% in high-boron
stainless steel. Method Two, methanol distillation-curcumin spectrophotometric
method, is suitable for determining the boron content of 0.0005%~0.20% by mass in
carbon steel, alloy steel, high-temperature alloys, and precision alloys. Method Three,
curcumin direct spectrophotometric method, is suitable for determining the boron
content of 0.0005%~0.012% in steel and 0.0001%~0.0005% in non-alloy steel.

Basic Data

Standard ID	GB/T 223.6-2025 (GB/T223.6-2025)
Description (Translated English)	Iron, steel and alloy - Determination of boron content - Neutralization titrimetric method and spectrophotometric method
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	H11
Classification of International Standard	77.080.01
Word Count Estimation	26,234
Date of Issue	2025-08-29
Date of Implementation	2026-03-01
Older Standard (superseded by this standard)	GB/T 223.6-1994, GB/T 223.75-2008, GB/T 223.78-2000
Issuing agency(ies)	State Administration for Market Regulation; Standardization Administration of China