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Bridge Structural Steel
Product Precision
Thickness: the thickness deviation of the sheet shall conform to the higher precision requirement in table 5 of GB/T 709.
Thickness: the thickness deviation of the sheet shall conform to the higher precision requirement in table 5 of GB/T 709.
Width: 0-6mm for the sheet with side trimming, the width shall be controlled by the mill for the sheet without side trimming.
Profile: sheet unflatness≤6mm within 1000mm.
The stress shall be released through high straightening force and high deformation force.
Delivery Standard of Bridge Steel
Steel grades | Specification | Norm |
Q345qC、D、E，Q370qC、D、E， Q420qC、D、E，Q460qC、D、E， Q345q（ D、Z、F）NH， Q370q（ D、Z、F）NH， Q420q（ D、Z、F）NH， Q460q（ D、Z、F）NH, etc. |
1.5～25*1000～ 2000mm | The product is delivered in accordance with national standards, industrial standards, Japan norms, American norms, European norm,s or technical agreement |
Mechanical property
| Steel grades | Quality grading | Tensile property | V-shape impact test | |||
| Lower yield strength, Rel/MPa | Tensile strength, Rm/MPa | Elongation after fracture, A/% | Test tempera- ture/℃ | Impact absorption energy, KV2/J | ||
| Q345q | C | ≥345 | ≥490 | ≥20 | 0 | ≥34 |
| D | -20 | |||||
| E | -40 | |||||
| Q370q | C | ≥370 | ≥510 | ≥20 | 0 | ≥120 |
| D | -20 | |||||
| E | -40 | |||||
| Q420q | C | ≥420 | ≥540 | ≥19 | 0 | ≥120 |
| D | -20 | |||||
| E | -40 | |||||
| Q460q | C | ≥460 | ≥570 | ≥17 | 0 | ≥120 |
| D | -20 | |||||
| E | -40 | |||||
| Q345q | D | ≥345 | ≥490 | ≥20 | -20 | ≥120 |
| Z | -40 | |||||
| F | -60 | |||||
| Q370q | D | ≥370 | ≥510 | ≥20 | -20 | ≥120 |
| Z | -40 | |||||
| F | -60 | |||||
| Q420q | D | ≥420 | ≥540 | ≥19 | -20 | ≥120 |
| Z | -40 | |||||
| F | -60 | |||||
| Q460q | D | ≥460 | ≥570 | ≥17 | -20 | ≥120 |
| E | -40 | |||||
| F | -60 | |||||
Application features
Bridge structural steel is dedicated to railway construction, highway, and cross-sea bridge. The bridge steel of LY Steel possesses stable properties, good toughness, anti-fatigue performance, anti-corrosion weldability and low notch sensitivity, the surface of the sheet is of good quality.
1、The steel is flat with an edge well trimmed, low diagonal deviation, high dimension precision, low carbon equivalent, and good weldability.
2、Online welding tests can be conducted.
