Casting type austenite stainless steel and manufacturing method thereof

Abstract

The invention relates to a casting type austenitic stainless steel and a manufacturing method thereof. The method comprises the following steps of batching, hot melting, refining and forming. Stainless steel scrape which is cheaper and adopts chromium elements with the proportion range of 13 to 18 weight percent is adopted as base, and by matching with that in the manufacturing process, manganese element replaces nickel element and content proportion of nitride element is increased, the austenitic stainless steel which contains less than 0.08 wt percent of C, less than 0.9 wt percent of Si, 13 to 19 wt percent of Mn, less than 0.04 wt percent of P, less than 0.04 wt percent of S, 13 to 18 wt percent of Cr, less than 0.1 wt percent of Ni, less than 0.8 wt percent of N and the balance of Fe and unavoidable impurities is manufactured and the austenitic stainless steel still has the characteristics of excellent corrosion resistance, mechanical property and the like of general 300 series stainless steel.

Description

technical field [0001] The present invention relates to a kind of stainless steel, in particular to a kind of casting type Wostian iron series stainless steel and its manufacturing method. Background technique [0002] In recent years, stainless steel has been widely used due to the development of economy and the improvement of living standards. Among them, the stainless steel of Wostian iron series is the most widely used because of its excellent corrosion resistance and easy processing, especially for general mechanical hardware. , Fire hardware and other parts. [0003] refer to figure 1 , in terms of stainless steel number 304 of the Wostian iron series, its main components are 0.07wt% carbon, 0.046wt% silicon, 1.44wt% manganese, 0.025wt% phosphorus, and 0.03wt% sulfur element, 8.14wt% nickel element, 18.43wt% chromium element, 0.2wt% nitrogen element, and the rest are essentially composed of iron element and unavoidable impurities; the conventional stainless steel num...

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Problems solved by technology

[0003] refer to figure 1 , in terms of stainless steel number 304 of the Wostian iron series, its main components are 0.07wt% carbon, 0.046wt% silicon, 1.44wt% manganese, 0.025wt% phosphorus, and 0.03wt% sulfur element, 8.14wt% nickel element, 18.43wt% chromium element, 0.2wt% nitrogen element, and the rest are essentially composed of iron element and unavoidable impurities; the conventional stainless steel number 304 is mainly based on its composition The content of the nickel element is at least 8.14wt%, which has the advantages of increasing the stability and corrosion resistance of the stainless steel. Use and its demand increase, thus causing the cost of nickel to rise steadily, causing the price of nickel-containing stainless steel to fluctuate greatly, and when the price continues to rise, it may lose its competitive advantage due to the high price, so it needs to be improved

[0004] Furthermore, the stainless steel manufacturing method 1 of the number 304 of the known Wostian iron series, such as figure 2 As shown, it includes a batching step 11, a hot melting step 12, a refining step 13, and a molding step 14; wherein, the batching step 11 is to prepare various raw materials in advance for the stainless steel composition of the final product, such as the raw ore with the highest cost, Or take the scraps of 304 stainless steel of Worth field iron series, expect to reduce the cost of stainless steel manufacturing with the same characteristics, at present, it is more common to use scraps, and then send these scraps to an airtight vacuum furnace 121 for heating Melting, so that these scraps are fused to liquid molten steel (i.e. hot melting step 12), then the impurities doped in the molten steel are removed, and then a raw material molten steel is obtained (i.e. refining step 13), in order to facilitate The raw material molten steel after the refining step 13 is poured into the injection mold of the mould, so that the finished product is manufactured after solidification, that is, the forming step 14; Must have up to 8.14wt% nickel element in this batching step 11, so must be added in this hot-melt step 12 insufficient part, at this moment in view of the high cost of this nickel element mentioned above, invisibly greatly increase The manufacturing cost of the stainless steel also needs to be improved

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