GB/T 17732-2023
Determination of dense shaped refractory products containing carbon (English Version)

Standard No.

GB/T 17732-2023

Language

Chinese, Available in English version

Release Date

2023

Published By

General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China  CN  /  GB

Latest

GB/T 17732-2023

Replace

GB/T 17732-2008

Introduction

Core changes in the standard update

Technical areas	2008 edition	2023 edition	Impact of changes
Equipment requirements	Balance graduation value 0.2g	0.1g	Measurement accuracy improved by 50%
Carbonization process	1000℃ loading/unloading	Room temperature loading/100℃ unloading	Enhanced operational safety
Residual carbon determination	Arbitration method not specified	Chemical analysis is the arbitration method	Dispute resolution standardization

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Analysis of key technical requirements

1. Carbonization performance determination

The new standard specifies that the sample size is 50mm±2mm cube/cylinder, and adds two new requirements:

• The number of samples changes from no regulation to at least 2
• The sample grinding after carbonization must meet the particle size requirements of GB/T16555-2017

Application case:

A Resin bonded magnesia carbon bricks adopt a new method to determine the carbonization mass loss rate, and the parallel test deviation is reduced from the original 1.2% to 0.5%.

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2. Antioxidation Test

New chapter to standardize the antioxidant test process, key parameters:

Parameters	Requirements
Specimen size	50mm±2mmcube/cylinder
Temperature program	8-10℃/min(Room temperature-1000℃)→4℃/min(>1000℃)
Air flow	4L/minConstant

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Background of Standard Revision

This revision is based on the ISO10060:1993 international standard and mainly meets the following three requirements:

1. Expand the scope of application to all dense shaped carbon-containing refractory products
2. Improve the measurement accuracy requirements (such as increasing the weighing accuracy to 0.1g)
3. Supplement the missing test methods such as oxidation resistance

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Implementation Suggestions

Key Points for Laboratory Renovation

• Update the balance equipment to division value ≤0.1g
• Configure a heat-resistant steel carbonization box that meets the dimensions of Figure 1
• Establish a carbonization test furnace with a temperature control accuracy of ±10℃

Test process optimization

For class=instrument>Asphalt bonded productsSpecial attention:

• Drying temperature must be strictly controlled below 40℃
• Physical property tests must be conducted at 22±2℃
• Samples containing antioxidants must be tested within 24 hours after carbonization

GB/T 17732-2023 history

• 2023 GB/T 17732-2023 Determination of dense shaped refractory products containing carbon
• 2008 GB/T 17732-2008 Dense,shaped refractory products.Test methods for products containing carbon
• 1999 GB/T 17732-1999 Dense, shaped refractory products--Test methods for products containing carbon
• 1991 GB/T 13244-1991 Test method for oxidation resistance of refactories containing carbon

Standard and Specification