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High-chromium cast iron liners have high wear resistance and a long service life, and have long been recognized by the industry. Their high performance represents the highest level of current metal wear-resistant materials. However, due to their high alloy content and relatively high production costs, their promotion and application have been affected to varying degrees, resulting in their not being widely used. High-chromium cast iron liners are renowned for their high strength, toughness and wear resistance. They have been widely used in large ball mills in the cement industry abroad, with a general service life of about 8 years, and in the second and third chambers, it can be over 12 years, and some can last up to 20 years, demonstrating excellent wear resistance.
Products Description
High-chromium alloy liner plate
- Material composition: The high chromium alloy cast wear-resistant liner is mainly composed of chromium, carbon, molybdenum, nickel and other elements. The chromium content is usually between 12% and 30%, and the carbon content is 1.0% to 3.0%. The chemical composition test of a certain manufacturer's high chromium alloy liner shows that the chromium content is 25%, the carbon content is 2.0%, and the molybdenum content is 2.5%, and it also contains a small amount of nickel and vanadium, which meets the component requirements of high chromium cast iron as stipulated in GB/T17445-2019.
- Metallographic characteristics: The metallographic structure of the high chromium alloy cast wear-resistant liner consists of a martensite matrix, eutectic carbides and secondary carbides. The eutectic carbides are distributed in a continuous or discontinuous network, with a hardness of up to HV1600. The metallographic test of a certain liner shows that the proportion of eutectic carbides is 35%, evenly distributed on the martensite matrix, ensuring excellent wear resistance.
- Mechanical performance indicators: The high chromium alloy cast wear-resistant liner has high hardness and wear resistance. The Rockwell hardness HRC can reach 58-65. The actual hardness of a certain liner is HRC62, and in the quartz sand wear test, the wear rate is only 0.08g/cm'. In terms of impact toughness, the impact absorption energy can reach 15-25J. The impact absorption energy of a certain type of liner tested under a 20J impact energy is that no cracks or fractures occur.
- Casting process key points: The high chromium alloy liner is cast using sand casting or lost foam casting. For sand casting, the molding materials are selected as silica sand and resin, and the mold needs to be dried at high temperature. In the liner casting process, the drying temperature is 300℃, and the holding time is 4 hours to prevent casting defects. In lost foam casting, the foam mold needs to be coated with refractory paint, dried, and then subjected to negative pressure pouring. The liner produced by a certain manufacturer through the lost foam process has a surface roughness Ra < 12.5HB, with a precision of CT9 level.
- Heat treatment process specifications: The heat treatment of the high chromium alloy liner includes quenching and tempering. The quenching temperature is 950-1050℃, and the holding time is determined according to the thickness. For a 20mm liner, the holding time is 2 hours. Oil cooling or air cooling is used. The hardness of a certain liner after quenching is HRC60. The tempering temperature is 200-300℃, and the holding time is 2 hours to eliminate internal stress. The impact absorption energy of a certain liner after tempering increases by 10%, while maintaining high hardness.
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1. 20 years of experience in casting cast iron plate, quality assurance, timely delivery
2. Perfect machining and inspection equipment can directly provide finished parts and meet the inspection requirements of customers
3. It has independent import and export rights and can export products to all parts of the world
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