TB/T 1978-2018 in English
VALIDBogie for railway freight car - Assembled brake beam
- Issued on:2018-07-31
- Implemented on:2019-02-01
- File Format:PDF
- Delivery:Via email within 5 business days
Price(USD)：
$420.00
$408.00
$408.00
Introduction
Background of Standard Revision and Technological Evolution
This standard integrates and replaces TB/T 1978-2007 and TB/T 3239-2010. The main technical upgrades include:
| Revision dimensions | 2007 version | New content of 2018 version |
|---|---|---|
| Material requirements | Unspecified low-temperature impact value | Newly added -40℃ impact absorption energy ≥27J |
| Inspection items | Basic mechanical properties | Added metallographic structure and decarburization layer depth inspection |
| Appendix Specifications | No special technical requirements | Three new appendices, including hot-rolled steel and square steel |
Analysis of core technical requirements
Structural type and material specifications
Composite brake beams are divided into three types: integral forging, integral hot rolling and shrink sleeve closed. Key material requirements:
- Q460E steel: yield strength ≥420MPa, -40℃ impact energy ≥27J
- Decarburization layer control: surface depth ≤0.3mm (Clause 4.3.5)
- Widmanstatten structure: not exceeding Grade C according to Appendix C
Key performance indicators
Static load test case: Deflection test load 104.5kN deformation ≤2.5mm, safety factor test must meet the following requirements:
- Vertical deformation ≤50mm
- Lateral deformation ≤13mm
- No cracks (Clause 5.6.2)
Implementation recommendations
Manufacturing process control
- Hot-fit process: end heating temperature 750-820℃, time 70-90s (Clause 4.4.8)
- Shot blasting: forgings need surface shot blasting (Clause 4.3.4)
- Welding specifications: Use low-hydrogen electrodes and prohibit welding surface defects (Clause 4.2.7)
Inspection points
| Inspection type | Sample size | Judgment rule |
|---|---|---|
| Factory inspection | 100% | Appearance size + mechanical properties |
| Type inspection | 8 pieces/batch | 2 pieces static load + 4 pieces fatigue test |
Sample only — not a preview of TB/T 1978-2018
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