一种耐腐蚀复合型双相不锈钢管
By using a gradient transition structure of inner, middle and outer layers and threaded connections, the corrosion and perforation problem of traditional stainless steel pipes in extreme corrosive environments is solved, thereby improving corrosion resistance and mechanical properties, extending service life and facilitating connection.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG XINTONGDA SPECIAL STEEL MFG CO LTD
- Filing Date
- 2025-07-21
- Publication Date
- 2026-07-17
AI Technical Summary
Traditional stainless steel pipes are prone to corrosion perforation in extreme corrosive environments, which leads to reduced strength, affects the normal operation of equipment, and may cause safety accidents. Ordinary duplex stainless steel has insufficient corrosion resistance in extreme corrosive environments.
The main body is made of stainless steel pipe consisting of an inner layer, a middle layer and an outer layer. The inner layer is made of corrosion-resistant special alloy, the middle layer is made of duplex stainless steel, and the outer layer is made of 304 stainless steel or Q235 carbon steel. The butt joint positioning is achieved through a gradient transition structure and threaded connection, which enhances corrosion resistance and mechanical properties.
Through the gradient transition structure and threaded connection, the stainless steel pipe achieves the best anti-corrosion effect in areas with different corrosion levels, extends its service life, facilitates docking, and improves safety and reliability in extreme corrosive environments.
Smart Images
Figure CN224516158U_ABST
Abstract
Claims
1. A corrosion resistant duplex stainless steel pipe of clad type, characterized by: It includes a stainless steel pipe body (1), which is composed of an inner layer (101), a middle layer (102) and an outer layer (103). The inner layer (101), the middle layer (102) and the outer layer (103) are tightly bonded by a gradient transition structure. The stainless steel pipe body (1) has a docking recess (2) and a docking boss (3) at its front and rear ends, respectively. The inner wall of the docking recess (2) has a positioning groove (4), and the outer end of the docking boss (3) has a positioning protrusion (5). The outer curved surfaces of the front and rear ends of the stainless steel pipe body (1) are fixedly installed with a front positioning ring (6) and a rear positioning ring (7), respectively. The outer sides of the front positioning ring (6) and the rear positioning ring (7) are respectively provided with a front arc-shaped connecting piece (8) and a rear arc-shaped connecting piece (9). The outer curved surfaces of the front arc-shaped connecting piece (8) and the rear arc-shaped connecting piece (9) are respectively threaded with a front connecting ring (10) and a rear connecting ring (11).
2. The corrosion resistant duplex stainless steel pipe of claim 1, wherein: The inner layer (101) is made of a special alloy material with corrosion resistance.
3. The corrosion resistant duplex stainless steel pipe of claim 2, wherein: The middle layer (102) is made of duplex stainless steel.
4. The corrosion resistant duplex stainless steel pipe of claim 3, wherein: The outer layer (103) is made of 304 stainless steel or Q235 carbon steel.
5. The corrosion resistant duplex stainless steel pipe of claim 4, wherein: The inner wall of the docking recess (2) and the outer end of the docking protrusion (3) fit together. There are several positioning grooves (4), which are symmetrically distributed along the inner wall of the docking recess (2).
6. The corrosion resistant duplex stainless steel pipe of claim 5, wherein: The outer end of the positioning protrusion (5) fits into the inner wall of the positioning groove (4).
7. The corrosion resistant duplex stainless steel pipe of claim 6, wherein: The number of the front arc-shaped connecting piece (8) and the rear arc-shaped connecting piece (9) is several, and they are arranged in an arc-shaped staggered symmetrical distribution on the outer side of the front positioning ring (6) and the rear positioning ring (7), respectively. The outer ends of the front arc-shaped connecting piece (8) and the rear arc-shaped connecting piece (9) are provided with external threads.