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Method for improving hardenability of 40MnBH steel for hardenability maintenance structure

A technology for hardenability and structure, which is applied in the field of improving the hardenability of 40MnBH steel for hardenability-retaining structures. It can solve the problems of not considering and specifying the influence of chemical composition and performance, hardenability is difficult to meet market demand, etc., to achieve The heat treatment method is simple, the cost is low, and the effect of comprehensive performance is good

Inactive Publication Date: 2013-02-06
INNER MONGOLIA BAOTOU STEEL UNION
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Problems solved by technology

This also shows that the chemical composition of 40MnBH steel for hardenability-retaining structures stipulated in the GB / T5216-2004 standard is summed up on the basis of electric furnace smelting, and does not consider and specify the chemical composition required by different smelting processes. performance, if the molten iron converter process is used for smelting, its hardenability is difficult to meet the current market demand

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  • Method for improving hardenability of 40MnBH steel for hardenability maintenance structure
  • Method for improving hardenability of 40MnBH steel for hardenability maintenance structure

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Embodiment Construction

[0009] After special research by scientific and technical personnel and experiments in a 25kg vacuum induction furnace, the composition range of molten steel for industrial production is designed, summarized and optimized as shown in Table 1, and the name of the steel grade is 40MnBH.

[0010] Table 1 Composition requirements of hardenability structural steel 40MnBH, w%

[0011]

[0012] The process flow is: 80t converter smelting→LF furnace refining→VD furnace vacuum degassing→continuous casting (the billet size is 240mm×240mm).

[0013] 3 heats of steel were produced for industrial trial production, and the specific process parameters were controlled as follows:

[0014] 1) Converter production

[0015] The carbon content, phosphorus content and tapping temperature of the molten steel at the end of the converter are shown in Table 2.

[0016] Table 2 The temperature and composition of 40MnBH tapping

[0017] Test No. Tapping temperature, ℃ Tapping carbon c...

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Abstract

The invention relates to a method for improving hardenability of 40MnBH steel for a hardenability maintenance structure and is characterized in that ferrovanadium is added to achieve microalloying of vanadium on the basis of chemical components of 40MnBH steel prescribed by GB / T5216-2004 standards during smelting, so that final 40MnBH steel comprises, by weight, 0.38% to 0.42% of carbon, 0.17% to 0.35% of silicon, 1.10% to 1.35% of manganese, less than or equal to 0.025% of phosphorus, less than or equal to0.025% of sulfur, 0.0010% to 0.0025% of boron, 0.038% to 0.048% of vanadium, and the balance ferrum and inevitable impurities. The method has the advantages that the kind of added microalloy elements is small; the adding method during smelting is simple, and the microalloy elements can be added with other alloy elements; addition amounts of microalloy elements are small, the cost is low, and the vanadium accounts for 0.038% to 0.048%; special technical processes are not needed during smelting and rolling, the comprehensive effectiveness is enhanced, and the effect of improving the hardenability is obvious; and the heat treatment method is simple when users use the 40MnBH hot-rolled steel, the heating temperature is not needed to be increased deliberately, the comprehensive performance of produced motor shaft products is good, machining properties are good, and the machining amount is small.

Description

technical field [0001] The invention relates to a method for improving the hardenability of 40MnBH steel used in hardenability-retaining structures, and belongs to the field of metal materials produced in the metallurgical industry. Background technique [0002] Baotou Steel adopts the chemical composition specified in the GB / T5216-2004 standard. The first batch of 40MnBH steel for hardenability protection structures produced for auto parts users failed in hardenability. After analysis and research (through composition design and intermediate frequency furnace smelting and forging tests ) learned that the lack of hardenability of the produced 40MnBH steel is due to the lack of necessary hardenability-enhancing elements in the steel. Scrap steel, no matter in terms of the type of residual elements or the composition ratio, is much more than that smelted by the molten iron converter process), therefore, it is inevitable that the hardenability of 40MnBH steel smelted by the mol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/12
Inventor 姜德刚何建中高明星
Owner INNER MONGOLIA BAOTOU STEEL UNION
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