GB/T 26080-2024 in English
VALIDold roll-forming rectangle steel tube for tower cranes
- Issued on:2024-04-25
- Implemented on:2024-11-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$243.00
| Standard No: | GB/T 26080-2024 |
| Document status: | VALID |
| Title in English: | old roll-forming rectangle steel tube for tower cranes |
| Title in Chinese: | 塔机用冷弯矩形管 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2024-04-25 |
| Implemented on: | 2024-11-01 |
| Superseding: |
GB/T 26080-2010 Roll-forming rectangle steel tube for tower crane
|
| Professional Classification: | GB-National Standard |
| Related Keywords: | old roll-forming rectangle steel tube
sharp-cornered steel pipe steel pipe code category description code square steel pipe rectangular sharp-cornered steel |
| Related Topics: | bend
GBT26080 GB/T 26080-2010 Cable cold bending |
《GB/T 26080-2024塔机用冷弯矩形管》由TC183（全国钢标准化技术委员会）归口，TC183SC8（全国钢标准化技术委员会型钢分会）执行，主管部门为中国钢铁工业协会。
Introduction
1. Standard Overview
The National Standard of the People's Republic of China GB/T 26080-2024 "Cold-bent rectangular tubes for tower cranes" was issued in 2024, replacing the old version GB/T 26080-2010. This standard specifies in detail the classification, specifications, technical requirements and test methods of cold-bent rectangular steel tubes for tower cranes. It is applicable to cold-bent hollow rectangular tubes for tower crane components produced by continuous roll cold-bending and high-frequency welding of hot-rolled steel strips or steel plates that can be deformed by cold processing.
2. Classification and Code
| Category | Description | Code |
|---|---|---|
| Square steel pipe and rectangular steel pipe | Cold-formed rectangular pipe with four rounded corners, including square and rectangle | F series (such as F50X50X4.0) |
| Square sharp-cornered steel pipe and rectangular sharp-cornered steel pipe | Cold-formed rectangular pipe with one sharp corner and the other three rounded corners | J series (such as JF66X66X6.0) |
3. Technical requirements
Chemical composition and mechanical properties: The chemical composition and mechanical properties of steel pipes must comply with the provisions of GB/T 700, GB/T 1591 and other standards, including yield strength, tensile strength and elongation after fracture.
Dimensional deviation and appearance requirements: The allowable deviation of side length, wall thickness, diagonal length, as well as the requirements for straightness and flatness are specified. For example, when the side length is <80, the deviation is ±0.5mm; when the side length is greater than or equal to 80, the deviation is ±0.7% of the side length.
Surface quality: Cracks, pits and protrusions exceeding the allowable deviation of wall thickness are not allowed on the surface of steel pipes. For key parts such as welds, 100% penetration testing is required to ensure that there are no visible defects.
4. Test methods and inspection rules
| Inspection items | Sampling quantity | Sampling location | Test method |
|---|---|---|---|
| Tensile test | 1 piece/furnace | Sampling according to GB/T 2975 | GB/T 228.1 |
| Impact test | 1 piece/furnace | Sampling according to GB/T 2975 | GB/T 229 |
| Weld flattening test | 1 piece/batch | Square or rectangular steel pipe longitudinal section | Appendix A specified method |
5. Implementation suggestions
Purchaser: When placing an order, the specifications, grades and special requirements of the steel pipe should be clearly stated, and the inspection basis should be ensured to comply with the standard. It is recommended to re-inspect key items such as weld quality, especially for large-sized steel pipes.
Manufacturer: The cold bending and high-frequency welding processes should be strictly controlled according to the process parameters to ensure dimensional accuracy and surface quality. Calibrate the measuring equipment regularly and keep complete inspection records for review.
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