GB/T 4697-2017 in English
VALIDHot rolled steel section for mine timbering
- Issued on:2017-07-12
- Implemented on:2018-04-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$146.00
| Standard No: | GB/T 4697-2017 |
| Document status: | VALID |
| Title in English: | Hot rolled steel section for mine timbering |
| Title in Chinese: | 矿山巷道支护用热轧型钢 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2017-07-12 |
| Implemented on: | 2018-04-01 |
| Superseding: |
GB/T 4697-2008 Hot-rolled U-type steel for mine timbering
|
| ICS Classification: | 77.140.70-Steels profiles |
| Chinese Classification: | H44-Profile steel and deformed steel |
| Professional Classification: | GB-National Standard |
| Related Keywords: | mine tunnel support gb/t
mine tunnel support steel section mine support design specifications select steel |
| Related Topics: | mine
as4697 Alley steel support GB/T4697-2008 mine roadway hot rolled steel GBT4697 GB/T 4697-1991 GB/T 4697-2008 GB/T 4697-2017 GB/T4697-2017 Hot rolled steel section latest Mine tunnel design Forged (rolled) steel balls for mining Special steel balls for mining Forged (rolled) steel balls for mining gb/t 4697-2017 gbt4697 |
《GB/T 4697-2017矿山巷道支护用热轧型钢》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 background and revision instructions
GB/T 4697—2017 replaces the previous GB/T 4697—2008. The main revisions include:
- Modify the standard name
- Add hot-rolled I-beams for mining and their grades
- Adjust the cross-sectional size and curvature requirements
- Update the chemical composition and performance indicators
2. Standard framework comparison
| Standard version | Main content changes | Scope of application |
|---|---|---|
| GB/T 4697—2017 | New I-beam specifications and performance requirements | Hot-rolled U-steel and I-steel for mine tunnel support |
| GB/T 4697—2008 | Only covers U-steel, no I-steel content | Hot-rolled U-steel for mine tunnel support |
3. Technical requirements and application cases
3.1 Material and performance
Grades: 20MnK, 25MnK, 20MnVK, chemical composition includes carbon (C), silicon (Si), manganese (Mn), vanadium (V), etc.
Mechanical properties: Tensile strength (Rm) ≥490 MPa, yield strength (RcH) ≥335 MPa, elongation after fracture (A) ≥20%.
3.2 Application examples
In mine tunnel support, 18UY and 25UY steels are mainly used for roof support, and 25U and 29U steels are suitable for side support. I-beams (specifications: 9, 11, 12) are used to enhance the stability of the support structure.
4. Implementation suggestions
- Selection: Select steel of appropriate specifications and grades according to the geological conditions of the tunnel.
- Inspection: Ensure that the steel meets the technical requirements of GB/T 4697-2017, including dimensional deviation, mechanical properties and surface quality.
- Installation: Carry out construction in accordance with the mine support design specifications to ensure structural stability and safety.
- Maintenance: Regularly check the use of steel and replace or repair damaged parts in a timely manner.
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