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A kind of chromium-containing alloy rod and its preparation method
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A technology of chromium alloy and rod, which is applied in the field of metallurgy, can solve the problem of coarse grain size of alloy rod, achieve the effect of improving grain size, good grain size, and compensating for high grain size
Active Publication Date: 2020-10-30
CHENGDE JIANLONG SPECIAL STEEL
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Problems solved by technology
[0007] In view of the problems existing in the prior art, the present invention provides a chromium-containing alloy bar and its preparation method, which solves the problem of coarse grain size of the alloy bar in the process of low rolling ratio of 40Cr steel by adjusting the chemical composition , with good economic benefits and application prospects
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Embodiment 1
[0028] The present embodiment prepares the chromium-containing alloy bar according to the following method:
[0029] Composition control (mass fraction): C: 0.37-0.44%, Si: 0.17-0.37%, Mn: 0.50-0.80%, Cr: 0.80-1.10%, Al: 0.020-0.030%, N: 0.007-0.010%, Mo ≤0.10%, Cu≤0.02%, Ni≤0.30%, and the balance is Fe.
[0030] The raw material selection, composition control and addition process of the above-mentioned components are the same as the method for smelting 40Cr steel.
[0031] The total charging capacity of the converter is controlled at 75 tons, the ratio of molten iron is ≥ 85%, and the rest is high-quality steel scrap. Tapping end point composition C: 0.08-0.15%, P≤0.016%, tapping temperature T: 1640°C; adding 150kg of aluminum block, 500kg of lime, 240kg of refining slag during tapping, adding manganese-silicon alloy, ferrosilicon alloy, High-carbon ferrochromium is alloyed after the furnace, and the sliding plate slag blocking technology is used to reduce the slag in the c...
Embodiment 2
[0037] Compared with Example 1, the amount of aluminum block added in the converter smelting process and the amount of nitrogen added in the LF refining process were controlled so that the Al content in the finally prepared chromium-containing alloy bar was 0.020%, and the N content was 0.007%. Other procedures and condition control are identical with embodiment 1.
[0038] The results show that the grain size of the bar obtained in this embodiment is 7.5-8.0.
Embodiment 3
[0040] Compared with Example 1, the amount of aluminum block added in the converter smelting process and the amount of nitrogen added in the LF refining process were controlled so that the Al content in the finally prepared chromium-containing alloy bar was 0.030%, and the N content was 0.090%. Other procedures and condition control are identical with embodiment 1.
[0041] The results show that the grain size of the bar obtained in this embodiment is 7.5-8.0.
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Abstract
The invention relates to a chromium-containing alloy bar material and a preparation method thereof. Al and N are added in a process of smelting steel with the trade mark of 40Cr to obtain the chromium-containing alloy bar material containing 0.020 to 0.030 weight percent of the Al and 0.007 to 0.010 weight percent of the N. Under the condition that existing equipment and technology are not changed, the problem that the grain size of the alloy bar material is large in a 40Cr steel low-rolling-ratio processing process is solved through adjusting chemical components; the grain size of a steel product is obviously changed under the matching effect of the Al and the N and a fine crystal reinforcing effect is realized. Under the same rolling condition, the grain size can be improved by 1.5 to 2.0 grades when being compared with that of existing 40Cr steel, and the problem that the capability of existing equipment is not enough so that the grain size is relatively high solved; the equipment investment is reduced and the chromium-containing alloy bar material has good economic benefits and application prospect.
Description
technical field [0001] The invention relates to the technical field of metallurgy, in particular to a chromium-containing alloy rod and a preparation method thereof. Background technique [0002] Chromium is an important alloying element added in the metallurgical process, and is the main alloying element of stainless acid-resistant steel and heat-resistant steel. It can increase the hardenability of steel and has the effect of secondary hardening, which can improve the hardness and wear resistance of carbon steel without making the steel brittle. When the chromium content exceeds 12%, it can make the steel have good high temperature oxidation resistance and oxidation corrosion resistance, and also increase the heat strength of the steel. Chromium can improve the wear resistance, hardness and red hardness of tool steel, and has good tempering stability. In electrothermal alloys, chromium can improve the oxidation resistance, electrical resistance and strength of the alloy....
Claims
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Application Information
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