GB/T 38806-2020 in English
VALIDMetallic materials- Sheet and strip-Test method for bending and folding properties
- Issued on:2020-06-02
- Implemented on:2020-12-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$165.00
《GB/T 38806-2020金属材料 薄板和薄带 弯折性能试验方法》由TC183（全国钢标准化技术委员会）归口，TC183SC4（全国钢标准化技术委员会力学及工艺性能试验方法分会）执行，主管部门为中国钢铁工业协会。
Introduction
Analysis of the core content of the standard
| Technical elements | 180° bending test | Bending test less than 180° |
|---|---|---|
| Test indicators | Minimum bending radius (min) | Limit bending angle (θmax) |
| Specimen size | 50mm×150mm | 60mm×60mm |
| Mold requirements | Press head radius 0.1-3.2mm classification | Support roller radius 15mm |
Key Technical Points
Test Equipment Selection
When conducting a 180° bending test, a flat indenter or a inclined indenter must be used. When the indenter radius is greater than 2.4mm, a flat indenter is preferred. The testing machine should have:
- Vertical/horizontal bidirectional loading mechanism
- 5-100mm/min speed adjustment range
- 0.05mm centering accuracy
Standard Evolution Analysis
This standard has the following major improvements compared with GB/T15825.5:
- Added limit bending angle determination method
- Refined the indenter specification classification (0.1mm interval)
- Introduced advanced determination methods such as optical measurement method
Implementation Suggestions
Specimen Processing Specifications
For high-strength steel (Rm≥780MPa), it is recommended that:
- Preferentially use displacement measurement method
- The initial indenter radius should be 6 times the sample thickness
- The edge burr should be controlled within 0.01mm
Typical application case: In the test of DC04 cold-rolled steel plate of a certain automobile enterprise, the maximum bending angle was measured to be 142° using a 0.4mm indenter radius.
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