GB/T 37620-2019 in English
VALIDCorrosion-resisting alloy forging
- Issued on:2019-06-04
- Implemented on:2020-05-01
- File Format:PDF
- Delivery:Via email within 5 business days
$301.00
| Standard No: | GB/T 37620-2019 |
| Document status: | VALID |
| Title in English: | Corrosion-resisting alloy forging |
| Title in Chinese: | 耐蚀合金锻材 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 5 business days |
| Issued on: | 2019-06-04 |
| Implemented on: | 2020-05-01 |
| ICS Classification: | 77.140.99-Other iron and steel products |
| Chinese Classification: | H59-Other special alloys |
| Professional Classification: | GB-National Standard |
| Related Keywords: | corrosion-resistant alloy forgings
corrosion-resisting alloy nickel-based alloy forgings corrosion-resistant alloy alloy |
| Related Topics: | f5 hydrogen resistant alloy
Monel alloy GBT37620 Corrosion Resistant Alloy Corrosion resistance of magnesium alloy Corrosion-resistant alloy composite oil pipe execution Alloy materials resistant to microbial corrosion Low alloy corrosion-resistant steel bars abroad |
《GB/T 37620-2019耐蚀合金锻材》由TC183（全国钢标准化技术委员会）归口，TC183SC10（全国钢标准化技术委员会特殊合金分会）执行，主管部门为中国钢铁工业协会。
Introduction
Interpretation of the core content of the standard
This standard specifies the technical requirements for 31 types of corrosion-resistant alloy forgings, including NS3101-NS4101, and is applicable to the manufacture of key components in the fields of petrochemicals, nuclear power, etc. The standard unifies the specifications of iron-nickel-based and nickel-based alloy forgings for the first time, reflecting the maturity of my country's corrosion-resistant alloy forging technology.
Comparison of key technical indicators
| Performance dimensions | Requirements for forged bars | Requirements for forgings | Detection differences |
|---|---|---|---|
| Mechanical properties | Longitudinal sampling (Table 5-6) | Directional sampling by forging type (Table 7) | Forgings need to consider the direction of metal flow lines |
| Dimensional deviation | Classification according to GB/T 908 | Classification provisions in Appendix A | Forgings need to reserve machining allowance |
| Non-metallic inclusions | Level Ⅰ-Ⅲ control (Table 8) | Special requirements for DS/E must be indicated | |
Key points of chemical composition control
The standard adopts a dual control mechanism:
- The basic composition meets the smelting analysis requirements of Table 3-4
- The finished product deviation complies with the provisions of GB/T 15007-2017
Special element control case: NS3304 requires a Mo content of 12.5-13.5%, and the fluctuation can be controlled within ±0.3% through AOD refining.
Key parameters of forging process
- Forging ratio: ingot ≥3, rolled product ≥1.6 (6.3 clause)
- Heat treatment system: solution temperature 1000-1250℃ (Table 5 Note)
- Grain size control: specific grades require ≥Grade 5 (6.8 clause)
Typical application: In the manufacturing of chemical pump shafts for NS3102 forgings, a step heating process is required to avoid thermal cracks.
Project Implementation Suggestions
Technical Requirements for Ordering
The following parameters need to be clarified (Clause 4.2):
| 1 | Alloy grade | Example: NS3306 |
| 2 | Smelting method | VOD+ESR dual |
| 3 | Ultrasonic testing level | According to GB/T 6402 Class B |
Quality dispute handling
Dispute resolution path (Clause 8.4):
- Unqualified chemical composition: rejection of the entire furnace
- Disputes over mechanical properties: double retest
- Surface defects: single piece determination
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