GB/T 4185-2017 in English
VALIDMolybdenum-tungsten alloy bars and rods
- Issued on:2017-07-31
- Implemented on:2018-02-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$262.00
《GB/T 4185-2017钼钨合金条及杆》由339-1（工业和信息化部（电子））归口，主管部门为工业和信息化部（电子）。
Introduction
Interpretation of GB/T 4185-2017 National Standard of the People's Republic of China
1. Background and significance of standard formulation
Molybdenum-tungsten alloy is an important electronic material, widely used in electronic tubes, electric light sources and other fields. With the advancement of technology, the original standards can no longer meet the needs of modern production. The release of GB/T 4185-2017 integrates and replaces GB 4185-1984 and GB/T 4186-2002, and further standardizes the production and inspection requirements of molybdenum-tungsten alloy bars and rods.
2. Comparative analysis of standard frameworks
| Standard items | GB 4185—1984 | GB/T 4186—2002 | GB/T 4185—2017 |
|---|---|---|---|
| Scope of application | Molybdenum-tungsten alloy bars only | Molybdenum-tungsten alloy rods | Integrated and expanded to cover bars and rods |
| Chemical composition requirements | Relatively loose | Refine impurity control | Add MoW30 grade with strict restrictions on impurity content |
| Specifications and Tolerances | Limited specifications | Partially expanded | Fully optimized, with multiple new specifications |
3. Detailed explanation of technical requirements
3.1 Chemical composition control
The chemical composition of molybdenum-tungsten alloy is the key to its performance. GB/T 4185-2017 has added strict requirements for the MoW30 grade to ensure the stability of the alloy's mechanical and physical properties.
3.2 Specifications and Tolerances
The standard stipulates that the specifications of molybdenum-tungsten alloy bars and rods must meet the requirements in the table. For example: the size of MoW50 square bar is (10~12)×(10~12)×350mm, and the diameter of round bar is φ17×600mm.
3.3 Surface quality requirements
The alloy surface must be smooth and free of defects. For example: the surface roughness of polished alloy rod shall not exceed Ra1.6, and oxidation color is not allowed.
Implementation suggestions
To ensure the effective implementation of the standard:
- Enterprises should establish a sound quality management system
- Equipped with advanced testing equipment, such as inductively coupled plasma optical emission spectrometer (ICP-OES) and eddy current flaw detector
- Strengthen employee training to ensure familiarity with the requirements of the new standard
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