GB/T 37435-2019 in English
VALIDCooling technical requirements of heat treatment
- Issued on:2019-05-10
- Implemented on:2019-12-01
- File Format:PDF
- Delivery:Within 1 day
$427.00
《GB/T 37435-2019热处理冷却技术要求》由TC75（全国热处理标准化技术委员会）归口，主管部门为国家标准化管理委员会。
Introduction
Analysis of the core content of the standard
This standard aims at the technical requirements of the entire process of liquid quenching of steel parts, and establishes a complete specification system from process design to equipment selection. The main technical framework includes:
| Technical modules | Core requirements | Key indicators |
|---|---|---|
| Quenching process formulation | Cracking tendency assessment based on material properties and workpiece structure | Carbon equivalent calculation, hardenability analysis, cooling curve matching |
| Cooling medium selection | Matching degree of medium cooling characteristics and workpiece | Maximum cooling rate ≥80℃/s (water medium), 300℃ cooling rate ≥20℃/s (oil medium) |
| Equipment technical requirements | Flow velocity uniformity in the effective quenching zone | Flow velocity deviation ≤15%, temperature rise ≤10℃/batch |
Key technical points
1. Quenching process formulation method
Henability methodThe equivalent cooling rate diameter is converted through the end quenching curve, and the calculation formula is:
Equivalent cooling rate diameter of the core Ec = D1.18/(8.29×H0.44)
Wherein, the H value is determined according to the medium type: still water H=0.9-1.0, strong stirring oil H=0.5-0.8
2. Cooling medium performance control
Quenching oilReplacement critical indicators:
- Kinematic viscosity change＞±50%
- Acid value increase＞1.5mg KOH/g (cooling oil)
- Maximum cooling rate decrease＞15℃/s
Implementation suggestions
Key points of quality control
| Test items | Frequency | Method |
|---|---|---|
| Polymer medium concentration | ≥1 time per week | Refractometer method (JB/T 4392) |
| Quenching oil cooling curve | ≥1 time every six months | Nickel probe method (GB/T 30823) |
| Effective quenching zone verification | At equipment acceptance | Flow rate field measurement + sample quenching |
Safety production requirements
Quenching oil tank must meet the following requirements:
- Working temperature ≤ flash point -50℃
- Equipped with liquid level alarm (±50mm)
- Oil fume purification efficiency ≥90%
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