GB/T 40404-2021Slag material—Measurement of melting temperature—High temperature metallographic method (English PDF)
渣类材料 熔化温度的测定 高温金相法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
August 20, 2021
Implementation date
March 1, 2022
Scope
GB/T 40404-2021 is the English-translated version of 渣类材料 熔化温度的测定 高温金相法.
GB/T 40404-2021 describes the high-temperature metallographic method for measuring the melting temperature of slag materials, defined as the temperature at which the specimen melts into a circular arc and begins to flow evenly outward.
It applies to smelting slag and continuous casting mould flux, can also serve as a reference for ores of similar composition, and does not apply to slags that react with platinum flakes.
It uses a high-temperature microscope.
The standard specifies the alumina crucible with its platinum gasket, the stacked stainless steel forming mould, sampling, pre-firing at 600 °C to 700 °C for mould slag containing volatiles or expanded graphite, grinding to 0.074 mm, 3 mm by 3 mm specimens, at least three per group, the test steps and the test report. It was issued on 20 August 2021 and has applied since 1 March 2022.
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Document preview — GB/T 40404-2021
National Standard of the People's Republic of China
- ICS
- 77.040.99
- Classification
- H 24
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword3
- 1 Scope4
- 2 Normative references4
- 3 Terms and definitions4
- 4 Method principle4
- 5 Instruments and sample preparation equipment5
- 6 Specimen preparation6
- 7 Test steps6
- 8 Test report8
- 9 Test report8
- Bibliography9
1 Scope
This document specifies the method principle, instrument and sample preparation equipment, specimen preparation, test steps and test report for the determination of melting temperature of slag materials.
This document applies to the determination of smelting slag and continuous casting mold flux by high temperature metallographic method. This document can also be used for the determination of the melting temperature of ores with similar compositions as reference.
This document does not apply to slag-type materials that react with platinum flakes.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
YB/T 186, Method of the test for melting temperature of continuous casting mold powder
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1 Melting temperature
The temperature at which the slag specimen melts to form a circular arc and begins to flow uniformly outward.
NOTE: The melting temperature of slag materials is mainly determined by the type and content of the composition.
4 Method principle
Use a high temperature microscope. Place the prepared cylindrical specimen on a […]
5 Instruments and sample preparation equipment
5.2.1 The crucible shall be an alumina crucible. Recommended crucible size: outer diameter is 9mm, inner diameter is 8mm, depth is 4mm, bottom thickness is 1mm.
5.2.2 Platinum gasket is used at the bottom of the crucible. The platinum gasket is 7mm in diameter and 0.05mm thick.
5.3 Forming mold
The forming mold is made by stacking three stainless steel sheets of the same size with a thickness of 3mm. Fix with screws. The upper two pieces have more than 3 holes with a diameter of 3mm. The holes of which the diameter is 1.5mm, 2mm or other can also be used in special cases. When the specimen is pressed, a small die steel bar of the same diameter shall be used.
6 Specimen preparation
6.1 Sampling
The sampling location shall be representative of the typical composition of the entire product.
6.2 Preprocessing
For mold slag containing volatile matter or mold slag containing expanded graphite, it shall be pre-fired in a muffle furnace at 600°C ~ 700°C for at least 2h.
6.3 Sample preparation
The specimen is pulverized into powder with a particle size of 0.074mm (200 mesh) or less. After mixing the powder and absolute ethanol in an agate mortar, take 5g~10g of the mixture in the molding die and compact it. Store in a desiccator. For individual samples that are difficult to compact, add a little dextrin. Use water to reconcile the specimen.
6.4 Specimen size and quantity
Unless otherwise specified, the specimen is generally 3mm in diameter and 3mm in height. There are no less than 3 specimens in each group.
7 Test steps
7.1 Turn on the device.
7.2 Place the specimen upright on the platinum sheet in the crucible. Then place the crucible on the sample rod in the furnace. Cover the stove. […]
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
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YB/T 186-2001 — Method of the test for melting temperature of continuous casting mold powder
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