Requirements for manufacturing wear-resistant pipes by chromium carbide surfacing
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Requirements for manufacturing wear-resistant pipes via chromium carbide surfacing. Operating environment conditions: The medium transported inside the wear-resistant straight pipes and elbows is coal dust particles, which cause significant erosion; the normal operating temperature ranges from 120°C to 160°C. II. Supply Products and Main Technical Specifications 1. Basic dimensions: DN2300×600×18×1500(mm), where the diameter of the upper opening is 2300 mm, the diameter of the lower opening is 600 mm, and the height is 1500 mm. The basic shapes are as follows: http://www.bhgdzb.com/UploadFiles/news/2021/11/202111040832581489.jpg http://www.bhgdzb.com/UploadFiles/news/2021/11/202111040840092402.jpg http://www.bhgdzb.com/UploadFiles/news/2021/11/202111040841100053.jpg Schematic diagram of reducers (units: millimeters/mm). 2. Material requirements for reducers: The inner wall serves as the base material, while the outer wall has a hardfacing layer applied to it. Composition of the hardfacing layer: C: 4.1%–4.5%, Cr: 21%–25%. 3. After hardfacing is completed, the surface must remain smooth and even. The material should possess good mechanical properties, allowing for necessary cutting and welding. Proper bevels must be machined at the joints between the base materials to ensure adequate welding strength. During cutting and welding, no local shedding of the surfacing layer shall occur on the material. 4. After fabrication, low-temperature tempering at 550°C is required to eliminate rolling stresses, ensuring that no significant issues occur during on-site cutting and use. 5. One set is divided into 2 equal parts based on the height of the vertebral body, with the upper part further divided into 8 equal parts and the lower part into 6 equal parts, resulting in a total of 14 pieces per set. Environmental conditions: the medium transported inside the wear-resistant fittings is coal powder; the normal operating temperature ranges from 120°C to 160°C.
1. The silicon carbide ceramic lining must be manufactured through sintering at high temperatures of over 1500°C, and the thickness of the iron casing should be no less than 10 mm. 2. Wear-resistant ceramic elbow pipes are formed by lining ordinary carbon steel pipes with silicon carbide ceramics, creating a silicon carbide/steel composite pipe. The silicon carbide lining adopts an eccentric circular structure with varying thicknesses; that is, the outer side of the curved sections and the lower half of the straight sections are slightly thicker, so as to ensure equal wear resistance across all parts of the pipeline and reduce waste. 1) The outside of the silicon carbide is covered with fiberglass or heat-resistant mortar to improve overall strength and impact resistance. 2) Wear-resistant elbow pipes ensure the concentricity of the elbow’s inner diameter and its overall quality. 3. During the service life of the wear-resistant elbow, it is necessary to ensure that the wear-resistant lining does not crack. Does not age with long-term use. 4. The wear-resistant elbows should be fabricated in the factory as much as possible; ideally, adjacent elbows and straight pipe sections should be assembled into a single pipe fitting within the bidder’s factory, with ceramic tiles covering the weld areas to form a unified structure. 5. The filler material between the wear-resistant ceramic and the steel pipe shall be proposed by the bidder and approved by the tendering party; the operating temperature shall be ≥1000°C. 6. Welding requirements: The welds of wear-resistant ceramic elbows must meet or exceed the following standards – no cracks, pores, or other defects are allowed in the butt welds of wear-resistant ceramic elbows ； All welds shall operate with sufficient strength for over 80,000 hours. 7. The pipe ends must be protected to prevent damage during transportation and lifting. 8. All pipe fittings shall have dedicated lifting rings.
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