HB 8423.3-2017 in English
VALIDMetal material grade identification method Part 3: Identification of alloy structural steel grade by looking at the spectrum
- Issued on:2017-04-12
- Implemented on:2017-10-01
- File Format:PDF
- Delivery:RFQ
| Standard No: | HB 8423.3-2017 |
| Document status: | VALID |
| Title in English: | Metal material grade identification method Part 3: Identification of alloy structural steel grade by looking at the spectrum |
| Title in Chinese: | 金属材料牌号鉴别方法 第3部分：看谱法鉴别合金结构钢牌号 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | RFQ |
| Issued on: | 2017-04-12 |
| Implemented on: | 2017-10-01 |
| Chinese Classification: | V00-Standardization and quality management |
| Professional Classification: | HB-Aviation |
Introduction
Standard Technical Background
HB 8423.3-2017, as an important part of the series of standards for metal material testing in the aviation industry, proposes a systematic spectrum analysis method for the identification of alloy structural steel grades. This standard inherits the drafting specification of GB/T 1.1-2009 and is jointly compiled by authoritative institutions such as the Beijing Institute of Aeronautical Materials of China Aviation Industry Corporation.
Core Detection Principle
Based on the characteristic spectrum of the sample produced by the spectroscope under arc/spark excitation:
| Analysis Phase | Technical Points | Judgment Basis |
|---|---|---|
| Matrix Identification | Fe Spectral Line Intensity and Structural Characteristics | Figure 1 Typical Spectrum Comparison |
| Element Qualitative Identification | 9 Characteristic Element Spectral Lines | Table 1 Detection Limit Determination |
| Semi-quantitative | Intensity Marking Method | Comparison of Spectra of Each Element |
Key Instrument Configuration
5.1.1 Spectroscope Requirements:
- Resolution: Need to resolve double lines such as Fe 519.146/519.235
- Light Intensity Standard: Clearly observe three spectral lines such as Fe 438.355 at 440nm
5.1.2 Excitation Light Source:
- AC Arc: Stable discharge with 2-3mm analysis gap
- Low-voltage spark: Si detection limit <0.3%, Al <1%
Key Points of Element Determination Technology
| Element | Characteristic spectral line (nm) | Measurement range (%) | Special requirements |
|---|---|---|---|
| Cr | 540.98/557.05 | 0.1-3 | Pre-combustion time unlimited |
| Mo | 553.31/603.07 | 0.05-1 | Pre-combustion ≥30s |
| Ni | 471.44/508.05 | 0.2-5 | Observe scintillation brightness |
| Si | 634.70/637.11 | 0.5-2 | Low-pressure spark excitation |
Implementation suggestions
- Establish a standard iron spectrum library (including prism/grating system differences)
- For refractory elements (W, Mo, etc.), extend the pre-combustion time to more than 30s
- Control the analysis gap ≤0.4mm when determining Al
- Carbon content differentiation needs to be combined with other detection methods
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