SN/T 5684-2024 in English
VALIDImport Metal Material Indentation Tensile Performance Testing Technical Regulations
- Issued on:2024-12-31
- Implemented on:2025-07-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$161.00
| Standard No: | SN/T 5684-2024 |
| Document status: | VALID |
| Title in English: | Import Metal Material Indentation Tensile Performance Testing Technical Regulations |
| Title in Chinese: | 进口金属材料压痕拉伸性能检测技术规程 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2024-12-31 |
| Implemented on: | 2025-07-01 |
| ICS Classification: | 77.040.01-Testing of metals in general |
| Chinese Classification: | H20-Metal physical and chemical property test method in general |
| Professional Classification: | SN-Import&Export Inspection |
Introduction
Background and evolution of standard technology
As an important supplement to traditional tensile testing, the development of indentation testing technology can be traced back to the instrumented indentation research in the 1990s. Compared with the conventional tensile test specified in GB/T228.1, the outstanding advantages of this standard are:
| Comparison dimensions | Indentation method (SN/T5684) | Traditional tensile method (GB/T228.1) |
|---|---|---|
| Specimen requirements | 40×40mm plane is sufficient | Standard tensile specimen required |
| Detection efficiency | Single point 3-5 minutes | More than 30 minutes |
| Destructiveness | Micro-damage detection | Complete destruction |
Analysis of core test principles
The stress-strain curve reconstruction based on the Hollomon model is the technical core of this standard, and its mathematical expression is a piecewise function:
{ EINσy1-NεN (σ>σy)
Key parameter acquisition path:
- Elastic modulus EI: determined by the slope of the unloading curve
- Yield stress σy: analyze the inflection point of the loading section
- Hardening exponent N: fit the plastic section curve
Technical requirements for key equipment
The indentation testing machine required by the standard must meet the following requirements:
- Displacement resolution ≤ 10nm
- Force accuracy ±0.5%FS
- The indenter diameter is preferably 1.0mm (steel) or 1.5875mm (aluminum)
A standard reference block must be used for daily inspection. It is recommended to use a Rockwell hardness block HRC60±2 to verify the equipment status.
Typical application cases
Case: Rapid acceptance of imported 304 stainless steel plates
A batch of 304 stainless steel plates was tested by the indentation method, and the results were:
- RmI = 515MPa (standard requirement ≥515MPa)
- RyI = 205MPa (standard requirement ≥205MPa)
The deviation from the traditional tensile test result is <3%, saving 75% of the testing time.
Implementation Suggestions
- Sample Preparation: Surface roughness needs to be controlled at Ra≤0.8μm, and diamond polishing paste is recommended
- Parameter Optimization: For high-strength steel, a loading rate of 2μm/s is recommended
- Result Verification: When used for the first time, a comparative test should be conducted with the traditional tensile method
- Quality Control: Establish a daily first-piece verification system
Loading PDF document...
Error loading PDF. Please make sure the file is valid and try again.
