HB 8423.6-2017 in English
VALIDMetal material grade identification method Part 6: Identification of iron-nickel-based high-temperature alloy grade by looking at the spectrum
- Issued on:2017-04-12
- Implemented on:2017-10-01
- File Format:PDF
- Delivery:RFQ
| Standard No: | HB 8423.6-2017 |
| Document status: | VALID |
| Title in English: | Metal material grade identification method Part 6: Identification of iron-nickel-based high-temperature alloy grade by looking at the spectrum |
| Title in Chinese: | 金属材料牌号鉴别方法 第6部分：看谱法鉴别铁镍基高温 合金牌号 |
| 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
Analysis of Standard Technology
| Core Elements | Technical Parameters | Application Value |
|---|---|---|
| Principle of the Method | Spectral Feature Analysis + Intensity Standard Semi-quantitative | Achieve Non-destructive Rapid Identification |
| Analytical Elements | Ni/Cr/Co/W/Mo/V/Ti/Nb/Al | Covering All Characteristic Alloy Elements |
| Detection Limit | 0.05%(Ti)~10%(Ni) | Meet the Detection Requirements of Different Contents |
Instrument configuration requirements
Spectrum mirror must meet the following requirements:
- Grating/prism dual system optional
- Resolution: Able to distinguish Fe519.146/519.235 double lines
- Wavelength range: 440-650nm
Excitation light sourceKey indicators:
- Stability: 2-3mm gap stable discharge
- Detection capability: Si≤0.3%, Al≤1%
Element determination system
Grading determination of nickel content
| Category | Content range(%) | Characteristic spectrum line |
|---|---|---|
| Type I low nickel | 20-30 | 1Ni<1Fe;2Ni stable appearance |
| Type II medium nickel | 30-40 | 1Ni≤1Fe;2Ni<2Fe |
| Type III high nickel | >40 | 1Ni≥1Fe;2Ni≤2Fe |
Criteria for determining key elements
- Niobium characteristics: Nb534.42/Nb535.07 double lines ≥1Fe are used to determine the presence of niobium
- Cobalt characteristics: Co535.21 ≥1Fe and the cobalt-containing grade does not contain chromium
- Molybdenum interference: Mo536.06 broad lines appear when the content is >1%
Implementation suggestions
Operation points
- Pre-combustion time control: Tungsten elements require pre-combustion for 50s, and molybdenum elements require 30s
- Excitation gap: conventionally 1-2mm, aluminum determination requires ≤0.4mm
- Spectral line observation order: It is recommended to follow the order of Ni→Cr→Nb→Co→Mo→W→V→Ti→Al
Common problem handling
| Phenomenon | Possible cause | Solution |
|---|---|---|
| Abnormal chromium wire intensity | Fluctuation of matrix iron content | Use copper electrode spectrum line as reference |
| Aluminum wire not detected | Insufficient excitation energy | Check electrode contact and use spark excitation |
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