Knowledge on Production Control and Improvement of Stainless Steel Pipe Fittings
The biggest advantage of extrusion molding is that during the extrusion process, the 'U-shaped groove' and the 'three-way bell mouth' walls do not become thinner through the method of adding material, meeting product quality requirements. The advantage of the expansion process is that it has relatively stable processing performance, smooth surface, and minimal rebound, while its disadvantage is the thinning of the pipe wall.
Whether using the extrusion process or the expansion process, ensuring the pipe wall thickness and maintaining quality is the prerequisite, and it is also a concrete manifestation of enterprises' requirements for cost, quality and technology. In the domestic market, there are often manufacturers promoting overly cheap stainless steel pipes to customers. Most of these pipes sacrifice the wall thickness and strength of the pipe material, which poses potential risks to the connection and safety of thin-walled stainless steel pipes.
Solution treatment is an indispensable process for improving pipe quality.
This process eliminates stresses and intergranular changes generated during production. Although solution treatment increases the cost by 2,600 to 2,800 yuan per ton, it is a crucial measure to enhance corrosion resistance. It must be performed after the completion of pipe forming and processing to effectively provide protection and should never be omitted.
While ensuring quality control in stainless steel materials, forming processes, wall thickness variations, and solution heat treatment, it is equally important to enforce and guide product quality and technical standards. This includes helping users better understand the functions, usage, and maintenance of products, accelerating the adoption of stainless steel water supply pipelines, increasing market share, and promoting their application across multiple fields. This is a systematic project that requires coordinated efforts and cooperation from all involved parties and stages.
1. Cost and cost-effectiveness. The initial investment cost of stainless steel water pipes is approximately twice that of ordinary galvanized pipes, and about 50% higher than that of composite pipes such as PPR. However, when considering the total lifecycle cost of a building, the average cost advantage of stainless steel pipes becomes very evident. Stainless steel pipes typically have a service life of around 70 years, while galvanized pipes last only about 10 years, and the cost of replacing pipelines is significantly higher than the initial investment. Therefore, stainless steel pipes are currently the most suitable choice for water transmission.
2. Wall thickness of stainless steel pipes. From the perspectives of safety and economy, we recommend that for stainless steel pipes with diameters ranging from DN15 to DN50, the wall thickness should be selected according to the II series specified in the GB/T19228.2-2011 standard. For stainless steel pipes with diameters above DN65 to DN100, the wall thickness should be selected according to the I series specified in the GB/T19228.2-2011 standard. This is the optimal wall thickness choice for thin-walled stainless steel water pipes.
3. Post-installation protection. Stainless steel has excellent corrosion resistance. Even if stainless steel products are left in a slightly acidic or slightly alkaline environment for a long time, they will still be corroded. This corrosion not only affects the surface of the stainless steel products, but also damages the intergranular structure of the stainless steel products. Secondly, high humidity environments also cause corrosion to stainless steel. If stainless steel products are left in a high-humidity environment for a long time, they will also be corroded. Thirdly, dust environments can also cause corrosion to the products, reducing the service life of the stainless steel pipes.
4. Pay attention to the water used for pressure testing of the pipes. It is essential to use clean tap water for the pressure test. It is strictly prohibited to use industrial wastewater or unclean river water, well water, or groundwater, as this will lead to corrosion of the stainless steel pipes.
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