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GB/T 223.11-2025: Iron, steel and alloy - Determination of chromium content - Titrimetric method and spectrophotometric method
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Std ID	Version	USD	Buy	Deliver [PDF] in	Title (Description)
GB/T 223.11-2025	English	599	Add to Cart	5 days [Need to translate]	Iron, steel and alloy - Determination of chromium content - Titrimetric method and spectrophotometric method
GB/T 223.11-2008	English	85	Add to Cart	0--9 seconds. Auto-delivery	Iron, steel and alloy -- Determination of chromium content -- Visual titration or potentiometric titration method
GB/T 223.11-1991	English	279	Add to Cart	3 days [Need to translate]	Methods for chemical analysis of iron, steel and alloy--The ammonium persulfate oxidation volumetric method for the determination of chromium content

GB/T 223.11-2025: Iron, steel and alloy - Determination of chromium content - Titrimetric method and spectrophotometric method

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ICS 77.080.01 CCSH11 National Standards of the People's Republic of China Replaces GB/T 223.11-2008 and GB/T 223.12-1991 Determination of Chromium Content in Iron and Steel Alloys Titration and Spectrophotometry Published on 2025-08-29 Implemented on 2026-03-01 State Administration for Market Regulation The State Administration for Standardization issued a statement.

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1.Structure and Drafting Rules of Standardization Documents". Drafting. This document is Part 11 of GB/T 223.The previously published parts of GB/T 223 are listed in Appendix A. This document replaces GB/T 223.11-2008 "Determination of Chromium Content in Iron and Steel and Alloys - Visual Titration or Potentiometric Titration Method" and GB/T 223.12-1991 Chemical Analysis Methods for Iron and Steel Alloys. Sodium Carbonate Separation-Diphenylcarbazide Photometric Determination of Chromium. Compared with GB/T 223.11-2008 and GB/T 223.12-1991, this document mainly features structural adjustments and editorial changes. The techniques have changed as follows. ---The description of the correction value for benzoic acid solution has been revised, and the calculation method has been clarified (see 4.2.16.2, GB/T 223.11-). (3.2.17.2 in.2008) ---Equation (1) has been modified, and V0 has been added [see Equation (1), Equation (1) in GB/T 223.11-2008]; ---Detailed specifications are provided for the sample volume and the concentration of ferrous ammonium sulfate solution used in titration in Table 1, "Sample Volume and Concentration of Ferrous Ammonium Sulfate Solution for Titration". Concentration (see Table 1, GB/T 223.11-2008), for ease of operation by laboratory technicians; ---The description regarding the addition of manganese sulfate has been revised (see 4.4.3.2, 3.4.3.2 of GB/T 223.11-2008); ---The "Reagents and Materials" section has added "5.2.2 Potassium (Sodium) Pyrosulfate or Potassium Bisulfate", and removed manganese sulfate solution (see 5.2.2). GB/T 223.11-2008, 4.2.14); ---Added a selection of electrodes (see 5.3); ---A guiding statement has been added to the section on "Reagents and Materials" (see 6.2, Chapter 3 of GB/T 223.12-1991); ---Added "Sampling" (see 6.4); ---The description of the sodium carbonate solution addition process has been revised (see 6.5.3.2, 4.3.2 of GB/T 223.12-1991) for the convenience of laboratory technicians. operate. This document is modified to adopt ISO 4937.2024 "Determination of chromium content in steel - potentiometric or visual titration". Compared with ISO 4937.2024, this document has undergone many structural adjustments. A comparison table of the structural numbering changes between the two documents can be found here. Appendix B. The technical differences between this document and ISO 4937.2024, and the reasons therefor, are as follows. ---Method 1 and Method 3 have been added (see Chapters 4 and 6) to facilitate standard implementation; ---ISO 3696 has been replaced by the normatively referenced GB/T 6682 (see 5.2), and GB/T 12805 has been replaced by the normatively referenced GB/T 12805. GB/T 12806 and GB/T 12808 replace ISO 385, ISO 648, and ISO 1042 (see 5.3), using normative references. GB/T 20066 replaces ISO 14284 (see 5.4) to facilitate standard implementation; ---The section on "Reagents and Materials" has been expanded to include 5.2.2 "Potassium (Sodium) Pyrosulfate or Potassium Bisulfate" (see 5.2) to facilitate standard implementation; ---The densities of phosphoric acid and nitric acid have been changed to be consistent with the densities of phosphoric acid and nitric acid in the national standards (see 5.2.5 and 5.2.6); ---The weighing accuracy of potassium dichromate and the sample has been changed from "0.0001g" to "0.001g", ensuring the accuracy of the balance is maintained. Maintain consistency (see 5.2.19 and 5.5.1); ---The procedure for handling incomplete sample digestion has been refined (see paragraph 2 of 5.5.3.1.4) to facilitate operation by laboratory technicians; ---The data rounding standard GB/T 8170 has been added to facilitate the implementation of the standard (see 5.6). The following editorial changes have been made to this document. ---The standard name has been changed to "Determination of Chromium Content in Iron and Steel and Alloys by Titration and Spectrophotometry". Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents. This document was proposed by the China Iron and Steel Association. This document is under the jurisdiction of the National Steel Standardization Technical Committee (SAC/TC183). This document was drafted by. Jiangsu Institute of Steel Research and Testing Technology Co., Ltd., Steel Research and Testing Technology Co., Ltd., and Baoshan District. Iron & Steel Co., Ltd., Shanxi Taigang Stainless Steel Co., Ltd., Fushun Special Steel Co., Ltd., and Iron & Steel Research Institute Co., Ltd. The main drafters of this document are. Luo Suibin, Sun Xiaofei, Ma Chao, Luo Qianhua, Miao Lede, Meng Qingrong, Yu Xue, Wang Jun, Qu Xiaogang, Feng Ran, and Fan Xiaofen. Yang Jingwei. The release history of this document and the document it replaces is as follows. ---GB/T 223.11-1963,GB/T 223.11-1982,GB/T 223.11-1991,GB/T 223.11-2008; ---GB/T 223.12-1982,GB/T 223.12-1991.

introduction

Steel is the backbone of the national economy, the lifeblood of the nation, and the material guarantee for its survival and development. The steel industry's standards system... In China, the standard system for determining the chemical composition of steel and alloys is a very important part, playing a crucial role in ensuring the quality of steel and alloy products. This series of method standards plays a vital role in the production, trade, and application of steel and alloys, providing technical support for the high-quality development of my country's steel industry. Technical support. GB/T 223 includes methods for the determination of chemical composition of iron and steel and alloys, specifying the values of carbon, silicon, manganese, phosphorus, sulfur, etc. in iron and steel and alloy products. Nickel, chromium, molybdenum, copper, vanadium, aluminum, titanium, cobalt, tungsten, niobium, zirconium, tantalum, calcium, magnesium, zinc, iron, arsenic, lead, tin, antimony, bismuth, cadmium, selenium, tellurium, cerium, boron, oxygen, nitrogen, hydrogen, Methods for determining total rare earth content and hydrochloric acid insoluble matter, and other chemical components. In 1963, GB/T 223 first published 12 national standards for the determination of chemical composition of iron and steel, which have been continuously improved in the field of steel and alloy analysis. Based on technological development and actual production needs, and through years of continuous revision and development, a relatively complete standard system has been formed. The constituent parts of GB/T 223 are shown in Appendix A. Determination of Chromium Content in Iron and Steel Alloys Titration and Spectrophotometry Warning---Personnel using this document should have practical experience working in a formal laboratory. This document does not address all possible safety issues. Users are responsible for taking appropriate safety and health measures and ensuring compliance with relevant national regulations. 1.Scope This document specifies the methods for determining the composition of pig iron, carbon steel, alloy steel, precision alloys, and high-temperature alloys using visual titration, potentiometric titration, and spectrophotometry. Chromium content in. This document applies to the determination of chromium content in pig iron, carbon steel, alloy steel, precision alloys, and high-temperature alloys. Method one is visual titration. Method 1 is applicable to the determination of chromium content (0.1%~35% by mass) in pig iron, carbon steel, alloy steel, high-temperature alloys, and precision alloys; Method 2 Method 1 is potentiometric titration, suitable for determining the chromium content in steel with a mass fraction of 0.25%~35%; Method 3 is sodium carbonate separation-diphenylcarbonyl The dihydrazine spectrophotometric method is suitable for determining the chromium content of 0.005% to 0.5% by mass in carbon steel, low alloy steel, and precision alloys.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included. For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies. This document. GB/T 223.13 Determination of Vanadium Content in Iron and Steel and Alloys by Titration and Spectrophotometry (GB/T 223.13-2025) ISO 4942.2016, MOD) GB/T 223.76 Chemical Analysis Methods for Iron and Steel and Alloys—Determination of Vanadium by Flame Atomic Absorption Spectrometry GB/T 6379.1 Accuracy (correctness and precision) of measurement methods and results - Part 1.General principles and definitions (GB/T 6379.1-2004,ISO 5725-1.1994,IDT) GB/T 6379.2 Accuracy (correctness and precision) of measurement methods and results - Part 2.Determining the repeatability of standard measurement methods Basic methods for sex and reproducibility (GB/T 6379.2-2004, ISO 5725-2.1994, IDT) GB/T 6682 Specifications and test methods for water used in analytical laboratories (GB/T 6682-2008, ISO 3696.1987, MOD) GB/T 7729 General Rules for Chemical Analysis of Metallurgical Products - Spectrophotometric Method GB/T 8170 Rules for rounding off numerical values and the representation and determination of limiting values GB/T 12805 Burettes for Laboratory Glassware (GB/T 12805-2011, ISO 385.2005, NEQ) GB/T 12806 Laboratory glassware - Single-mark volumetric flasks (GB/T 12806-2011, ISO 1042.1998, NEQ) GB/T 12808 Laboratory Glassware - Single-mark Pipettes GB/T 20066 Sampling and sample preparation methods for the determination of chemical composition of steel and iron (GB/T 20066-2006, ISO 14284. 1996, IDT) GB/T 20125 Determination of Multi-Element Content in Low-Alloy Steels by Inductively Coupled Plasma Atomic Emission Spectrometry 3.Terms and Definitions This document does not contain any terms or definitions that need to be defined. ...