European and American refrigeration technology

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　　We understand that with the development of the chemical industry in China, the application of duplex stainless steel pipes has become more and more extensive, and domestic duplex stainless steel pipes are growing at a rate of 10% every year. Next, we explain the content of the development of refrigerator stainless steel water tank machinery.

　　The outstanding performance of the stainless steel pipe of the chiller is that it has high yield strength and stress corrosion resistance, good weldability, and low sensitivity to welding cold cracks and hot cracks. In Japan, austenitic and ferritic stainless steel welded pipes account for 54% of the market share of piping systems in the petrochemical industry. While stainless steel welded pipes in my country are mainly used in the decorative field, the corrosion-resistant welded pipes used in the petrochemical field are basically blank.

　　At present, domestic stainless steel has certain differences in terms of variety, specifications, quantity, quality, etc., both in terms of meeting market demand and comparing with the technological level of advanced industrial countries. Specific embodiment: In terms of the quantity of products, the output of general-purpose ordinary stainless steel has been balanced with the overall market demand.

　　However, there is a lack of production capacity for materials with higher requirements, especially for high-demand industrial materials, such as high-pressure stainless steel boiler tubes. In terms of product specifications, the production capacity of general-purpose small and medium-diameter stainless steel pipes is greater than market demand, and large-diameter , High-demand stainless steel pipes are in short supply in the market, and there is a large gap. For example, extra large-diameter stainless steel pipes above φ 219mm need to be imported to make up for the lack.

　　Another example is the ultra-long passenger longer than 15m, which is rarely produced in China and basically depends on imports. In terms of varieties, compared with advanced industrial countries, there are few varieties of domestic stainless steel and there are almost no high-tech varieties, such as duplex steel Hastelloy, etc., some special stainless steel pipes with high technical difficulty and high quality requirements.