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Chromium-free high boron iron-based casting alloy and preparation method
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A casting alloy, high boron technology, applied in the field of metal casting, can solve the problem of high production cost
Inactive Publication Date: 2011-02-23
KUNMING UNIV OF SCI & TECH
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[0008] It can be seen that the current high-boron iron-based casting alloys are actually developed on the basis of cast iron-chromium alloys, and they all contain more alloying elements such as chromium, nickel, molybdenum, vanadium, etc., and the production cost is relatively high.
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Embodiment 1
[0027] The chemical composition (percentage by weight) of the chromium-free high-boron iron-based casting alloy in this embodiment is: 0.47C, 3.0B, 0.36Si, 0.42Mn, 0.03P, 0.04S, and the balance is iron.
[0028] During smelting, a 100kg intermediate frequencyinduction furnace is used, and the batching is carried out according to the content and yield of each element in the raw materials. The composition (percentage by weight) of the raw materials used is as follows:
[0029] Industrial ferroboron: 17.59B, 0.65Si, 0.028P, 0.12C, 0.003S, the balance is iron;
[0030] Steel scrap: 0.15C, 0.16Si, 0.5Mn, 0.08P, 0.03S, the balance is iron;
[0031] Carburizer: 80C, the balance is ash.
[0032] Element yield: The yield of carbon is calculated as 90%, the yield of boron is calculated as 50%, the yield of Si is calculated as 95%, and the yield of Mn is calculated as 90%.
[0033]The weight of the prepared various furnace materials is: scrap steel 65.1kg, ferroboron 34.3kg, recarbur...
Embodiment 2
[0035] The chemical composition (percentage by weight) of the chromium-free high-boron iron-based casting alloy in this embodiment is: 0.27C, 2.0B, 0.33Si, 0.62Mn, 0.06P, 0.06S, and the balance is iron.
[0036] During smelting, a 250kg intermediate frequencyinduction furnace is used, and the batching is carried out according to the content and yield of each element in the raw materials. The composition (percentage by weight) of the raw materials used is as follows:
[0037] Industrial ferroboron: 17.59B, 0.65Si, 0.028P, 0.12C, 0.003S, the balance is iron;
[0038] Steel scrap: 0.15C, 0.16Si, 0.5Mn, 0.08P, 0.03S, the balance is iron;
[0039] Carburizer: 80C, the balance is ash.
[0040] Element yield: The yield of carbon is calculated as 90%, the yield of boron is calculated as 50%, the yield of Si is calculated as 95%, and the yield of Mn is calculated as 90%.
[0041] The weights of the prepared charge are as follows: scrap steel 191.4kg, ferroboron 58.1kg, recarburizer...
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Abstract
The invention discloses a chromium-free high boron iron-based castingalloy and a preparation method. The high boron iron-based alloy comprises the following chemical components in percentage by weight: 0.2 to 1.0 percent of C, 1.0 to 4.5 percent of B, 0.20 to 0.70 percent of Si, 0.20 to 0.8 percent of Mn, less than 0.1 percent of S, less than 0.1 percent of P and the balance of Fe and inevitable trace impurities. The alloy is produced by an electric induction furnace, and smelted and cast and then is subjected to heat treatment and used. The alloy does not contain chromium and has a low price and high comprehensive performance, and the alloy performance can be controlled in a large range by controlling the proportions of boron and carbon so as to meet the requirement of different working conditions. The method has the advantages of low production cost, simple process, and high operability.
Description
technical field [0001] The invention relates to the technical field of metalcasting, in particular to a chromium-free high-boron iron casting alloy and a preparation method thereof. Background technique [0002] Chromium is a common element used to improve the properties of steel materials. In recent years, due to the scarcity of resources and skyrocketing prices, the application of chromium-containing ferro-based casting alloys has become more and more restricted. As an abundant element in the earth's crust, boron has recently been paid attention to its role in iron and steel materials. [0003] In the late 1980s, Egorov and Nevar of the former Soviet Union successively studied the structure and properties of iron-carbon alloys containing 4.9% to 5.1% boron, 2.85% to 3.10% chromium, and 1.0% to 4.0% cobalt. The results showed that boron Elements can effectively increase the hardness of materials. The boron-containing iron-based alloy announced by the former Soviet paten...
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