GB/T 37598-2019 in English
VALIDInspection of non-metallic inclusions in steel—Blue fracture test method
- Issued on:2019-06-04
- Implemented on:2020-05-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$78.00
《GB/T 37598-2019钢中非金属夹杂物的检验 发蓝断口法》由TC183（全国钢标准化技术委员会）归口，TC183SC14（全国钢标准化技术委员会金相检验方法分会）执行，主管部门为中国钢铁工业协会。
Introduction
Interpretation of the National Standard of the People's Republic of China GB/T 37598—2019
| Standard Dimensions | GB/T 37598—2019 | Comparison Standard ASTA M A452 |
|---|---|---|
| Scope of Application | Inspection of macroscopic non-metallic inclusions in steel, with a length of not less than 1 mm and a width of not less than 0.1 mm | Applicable to the detection of non-metallic inclusions of similar sizes |
| Core Method | Bluing fracture method, generating an oxide film by heating to the blue brittle temperature | Combination of heat treatment and microscopic observation |
| Detection accuracy | Inclusion length is recorded accurately to 0.1 mm | ASTM A452 has higher requirements and requires calibration of equipment to the micron level |
Principle and application case of bluing fracture method
Bluing treatment:Heat the steel to the blue brittle temperature (300°C~350°C), and a very thin blue oxide film will be formed on the surface, and non-metallic inclusions will retain their original color. This method is suitable for distinguishing ferrite bands, carbide bands and non-metallic inclusions.
Precautions in practical application
- High alloy steel treatment:Appropriately increase the blue brittle temperature, but not more than 530°C to avoid excessive oxidation.
- Specimen preparation: Ensure that the groove depth is appropriate to prevent detection errors caused by heat-affected zones.
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