GB/T 38941-2020 in English
VALIDSuperalloy rods for powders atomized by plasma rotating electrode process
- Issued on:2020-06-02
- Implemented on:2020-12-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$97.00
《GB/T 38941-2020等离子旋转电极雾化制粉用高温合金棒料》由TC183（全国钢标准化技术委员会）归口，TC183SC10（全国钢标准化技术委员会特殊合金分会）执行，主管部门为中国钢铁工业协会。
Introduction
Analysis of the core content of the standard
GB/T38941-2020 stipulates a full set of technical requirements for high-temperature alloy rods for plasma rotating electrode atomization powder making, mainly including:
- Material range: Rod-shaped raw materials suitable for the preparation of spherical metal powders for aero-engines
- Core technical indicators: Chemical composition deviation is controlled in the range of ±0.005%-±0.5%
- Surface quality: Ultra-precision machining requirements of Ra≤1.6μm
Comparison of key technical requirements
| Indicator type | Conventional standard | GB/T38941 requirements | Improvement range |
|---|---|---|---|
| Oxygen content | ≤50ppm | ≤15ppm | 70% |
| Grain size | ASTM Grade 3-5 | ASTM Grade 5-7 | Grade 2 |
| Surface roughness | Ra≤3.2μm | Ra≤1.6μm | 50% |
Material Preparation Process Evolution
The standard recommended triple melting process (vacuum induction + arc remelting + electroslag remelting) can:
- Reduce non-metallic inclusions by more than 80%
- Element segregation is controlled within 0.3%
- Bar density reaches 99.95%
Typical case: After the FGH96 alloy powder for a certain type of aircraft engine turbine disk is prepared using this standard bar:
- Powder sphericity rate increased from 92% to 98%
- Hollow powder rate decreased from 1.2% to 0.3%
Implementation and application suggestions
Purchasing link
The contract must clearly state:
- Traceability requirements for melting furnace number and melting date
- Retain 2% of each furnace of bar samples
- Re-inspection clause by third-party testing agency
Production process control
Key control points:
- Raw material purity verification (Ni≥99.96%)
- Argon dew point in smelting process≤-50℃
- Machining coolant pH value 7.5-8.5
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