A kind of high chromium cast iron for making machine head and machine mouth bushing and its preparation method
A technology of high chromium cast iron and bushing, which is applied in the field of wear-resistant materials, can solve the problems of poor brick forming, low work efficiency, high frictional heat, etc., and achieve the goal of improving the forming quality, production efficiency, and anti-grinding wear performance Effect
Active Publication Date: 2018-12-04
SHUANGYASHAN TIANHONG MACHINERY MFG
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Problems solved by technology
[0002] In the actual production process of hollow brick or solid brick factory, during the extrusion process of adobe mud strips, the pressure at the head and mouth of the machine is high, the frictional heat is high, and the wear is serious, which directly leads to poor molding of adobes and unstable dimensions; frequent replacements reduce work efficiency. Therefore, it is very necessary to invent a high-chromium cast iron for making machine head and machine mouth bushing and its preparation method
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment 1
[0012] Step 1. The chemical elements and mass percentages are C: 2.2%, Mn: 0.9%, Cr: 13.5%, Mo: 0.5%, Si: 0.6%, Cu: 0.15%, RE-Ti: 0.1%, P: 0.03 %, S: 0.03%, and the high-chromium cast iron components with the remaining content of Fe are smelted in a medium-frequency induction furnace at a melting temperature of 1580 ° C, and refined and tempered by adding rhenium-titanium. After the composition is adjusted to pass, high-chromium cast iron is obtained Molten iron, pour high chromium cast iron molten iron into the blank forming mold and form it to obtain high chromium cast iron bushing blank;
[0013] Step 2. Preliminary heat treatment: Heat the blank of high chromium cast iron bushing to 850°C at a heating rate of 90°C / h through a heat treatment furnace, keep it in the furnace for two hours, then cool it down, and perform preliminary heat treatment to reduce the hardness of the blank. to 25-28HRC;
[0014] Step 3. Processing and molding: process the blanks that have undergone ...
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Abstract
The invention belongs to the technical field of wear resistant materials, and particularly relates to high-chromium cast iron for manufacturing machine head and machine port bushings and a preparation method thereof. The high-chromium cast iron for manufacturing the machine head and machine port bushings is prepared from the following chemical elements according to mass percent: 2% to 2.4% of C, 0.6% to 1.2% of Mn, 12% to 15% of Cr, 0.4% to 0.6% of Mo, 0.3% to 0.8% of Si, 0.1% to 0.2% of Cu, 0.05% to 0.15% of RE-Ti, less than 0.05% of P, less than 0.05% of S and the balance of Fe. The method comprises the following steps of (1) manufacturing workblanks of the high-chromium cast iron bushings; (2) preparing for heat treatment; (3) processing and forming; and (4) performing heat treatment. The high-chromium cast iron product has the advantages of high efficiency, wear resistance, low cost, economy and applicability, the production efficiency is improved, the service life is prolonged, and the preparation method and process are simple and are easy to operate and master.
Description
technical field [0001] The invention belongs to the technical field of wear-resistant materials, and in particular relates to a high-chromium cast iron used for making machine heads and machine mouth bushes and a preparation method thereof. Background technique [0002] In the actual production process of hollow brick or solid brick factory, during the extrusion process of adobe mud strips, the pressure at the head and mouth of the machine is high, the frictional heat is high, and the wear is serious, which directly leads to poor molding of adobes and unstable dimensions; frequent replacements reduce work efficiency. Therefore, it is very necessary to invent a kind of high chromium cast iron for making machine head and machine mouth bushing and its preparation method. Contents of the invention [0003] The present invention makes up for and improves the deficiencies of the above-mentioned existing products, and provides a high-efficiency wear-resistant, improved production...
Claims
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IPC IPC(8): C22C37/10C22C37/06C22C33/08C21D1/18C21D5/00
CPCC21D1/18C21D5/00C22C33/08C22C37/06C22C37/10Y02P10/20
Inventor 周志宏胡业明倪长生胡刚王高鹏张海江孙秀章
Owner SHUANGYASHAN TIANHONG MACHINERY MFG