Stainless steel electric heating pipe added with Nb element and manufacturing process thereof
A manufacturing process, stainless steel technology, applied in the field of electric heating tubes, can solve the problems of bond force damage between grains, tube burst, electric heating tube cracks, etc., to reduce the possibility of grain boundary corrosion, safe and reliable, and long service life Effect
Inactive Publication Date: 2019-08-06
安徽苏立科技股份有限公司
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Problems solved by technology
[0002] At present, most of the metal materials used in the electric heating tube are nickel-based alloy stainless steel. When the electric heating tube made of chromium-nickel austenitic stainless steel is heated to a temperature range of 450-850 ° C, corrosion along the grain boundary often occurs, making the grains If the bonding force between them is destroyed, cracks will appear on the surface of the electric heating tube if it is light, and the tube will burst if it is serious, which greatly affects the service life and safety of the electric heating tube.
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[0027] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further elaborated below in conjunction with the embodiments.
[0028] A kind of manufacturing process of adding Nb element stainless steel casing, concrete steps are as follows:
[0029] (1) According to the smelting requirements, the corresponding alloying elements are weighed for batching, and after mixing evenly, the electrode block is pressed into an electrode block; the electrode block contains the following components in weight percentage:
[0030] C is 0-0.07%; Mn is 0-0.07%; Si is 0-1.5%; P is 0-0.045%; S is 0-0.03%; Cr is 18.0-22.0%; Ni is 18.0-23.0%; Nb 1.0-5.0%; the balance is Fe and unavoidable impurities;
[0031] (2) Put the electrode block into a vacuum smelting furnace for smelting, heat the temperature to 1600°C, maintain the vacuum state at 0.2-0.5Pa, repeat smelting 3 times, each smelting time...
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The invention relates to a stainless steel electric heating pipe added with an Nb element and a manufacturing process of the stainless steel electric heating pipe. The stainless steel electric heatingpipe is prepared by, by weight, 0-0.07% of C, 0-0.07% of Mn, 0-1.5% of Si, 0-0.045% of P, 0-0.03% of S, 18.0-22.0% of Cr, 18.0-23.0% of Ni, 1.0-5.0% of Nb and the balance Fe and unavoidable impurities. Nb stainless steel is added as the material of the electric heating pipe, compared with common nickel-base alloy stainless steel, grain boundary corrosion of the electric heating pipe in a 450-850DEG C temperature range is effectively prevented, the possibility of grain boundary corrosion of the electric heating pipe is greatly reduced, and the electric heating pipe is longer in service life and more reliable in safety.
Description
technical field [0001] The invention relates to the technical field of electric heating tubes, in particular to a stainless steel electric heating tube with Nb added and a manufacturing process thereof. Background technique [0002] At present, most of the metal materials used in the electric heating tube are nickel-based alloy stainless steel. When the electric heating tube made of chromium-nickel austenitic stainless steel is heated to a temperature range of 450-850 ° C, corrosion along the grain boundaries often occurs, making the grains If the bonding force between them is destroyed, cracks will appear on the surface of the electric heating tube if it is light, and the phenomenon of tube bursting will occur in severe cases, which greatly affects the service life and safety of the electric heating tube. The main cause of grain boundary corrosion is that carbon element is precipitated in the form of Cr23C6 from the saturated austenite structure, which makes the austenite a...
Claims
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Login to View More IPC IPC(8): C22C38/02C22C38/04C22C38/48C21D8/02B23P15/00
CPCB23P15/00C21D8/0226C22C38/002C22C38/02C22C38/04C22C38/48
Inventor 孙杨魏振球魏平骆亚运
Owner 安徽苏立科技股份有限公司