GB/T 33975-2017 in English
VALIDHot-rolled spring steel wire rod for high-speed railway fastener
- Issued on:2017-07-12
- Implemented on:2018-04-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$136.00
| Standard No: | GB/T 33975-2017 |
| Document status: | VALID |
| Title in English: | Hot-rolled spring steel wire rod for high-speed railway fastener |
| Title in Chinese: | 高速铁路扣件用弹簧钢热轧盘条 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2017-07-12 |
| Implemented on: | 2018-04-01 |
| ICS Classification: | 77.140.60-Steel bars and rods |
| Chinese Classification: | H44-Profile steel and deformed steel |
| Professional Classification: | GB-National Standard |
| Related Keywords: | hot-rolled spring steel wire rod
high-speed railway fastener introduction spring steel high-speed railway fasteners high-speed railway network |
| Related Topics: | spring steel
acceleration condition high speed rail GBT33975 GB/T 33975-2017 High Speed Rail Fasteners High-speed railway fasteners (spring V-shaped fasteners) Fasteners High-speed railway fastener elastic cushion Railway fastener related Hot rolled wire rod scale Railway fastener installation Subway fasteners Railway fastener cushion |
《GB/T 33975-2017高速铁路扣件用弹簧钢热轧盘条》由TC183（全国钢标准化技术委员会）归口，TC183SC3（全国钢标准化技术委员会盘条及钢丝分会）执行，主管部门为中国钢铁工业协会。
Introduction
1. Background and significance of standard formulation
GB/T 33975—2017 "Hot-rolled spring steel wire rod for high-speed railway fasteners" is one of the important standards formulated by China for key components of high-speed railways. With the rapid development of China's high-speed railway network, the performance requirements for rail fastener systems are increasing. The introduction of this standard fills the gap in the domestic specification of special spring steel materials in the field of high-speed railways.
2. Comparative analysis of standard frameworks
| Standard dimensions | GB/T 33975—2017 | Reference standards | Comparative analysis |
|---|---|---|---|
| Chemical composition control | Strictly limit the content of elements such as C, Si, and Mn to ensure the hardenability and mechanical properties of the material. | GB/T 222, GB/T 4336 | Compared with the general spring steel standard, the chemical composition requirements are more refined, especially the control of P and S impurities is more stringent. |
| Mechanical property requirements | Tensile strength ≥730 MPa, cross-sectional shrinkage ≥5%. | GB/T 228.1 | Higher than the standard of spring steel for ordinary railways, reflecting the high requirements of high-speed railways for material performance. |
| Microstructure requirements | Pearlite + ferrite, no martensite or bainite. | GB/T 13298, GB/T 13299 | Explicitly prohibit the type of organization that affects the use, and emphasize the consistency and stability of the material. |
3. Implementation suggestions and precautions
Raw material procurement:It is recommended to use electric arc furnaces or converters that meet the standards to smelt steel billets, and conduct sufficient refining outside the furnace to ensure the uniformity and stability of the chemical composition.
Production process control:During the hot rolling process, the depth of the decarburization layer and the surface quality should be strictly monitored to avoid performance degradation due to oxidation or overheating. It is recommended to use advanced temperature control and rolling technology.
Inspection and acceptance:For products purchased in large quantities, they should be inspected strictly in accordance with the sampling plan specified in the standard, and special attention should be paid to the detection of non-metallic inclusions to ensure that they meet the requirements of Method A.
Storage and logistics:During storage and transportation, the wire rod should avoid humid and corrosive environments. It is recommended to use moisture-proof packaging and store it in a dry and ventilated warehouse.
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