What heat treatments are generally required for the steel rods in rod mills?

There are many processing steps, and the details are confidential. Huamin has extensive experience in this industry; it is recommended to use Huamin’s products to ensure durability and prevent breakage. Shandong Huamin Steel Ball Co., Ltd. Zhang Xun/Marketing Director Mobile: 13953147415 QQ: 549551716 Email: 549551716@qq.com

Huamin Company produces 30,000 tons of steel rods for rod mills each year; it is the largest manufacturer of such steel rods in China, and its products are sold to more than 20 countries and regions around the world. Huamin steel rods are suitable for a wide range of users of rod mills and coal grinding mills, including quartz sand plants, mines, cement factories, power plants, silica sand plants, sand aeration facilities, coal chemical industries, concrete plants, and manufacturers of new building materials. Huamin wear-resistant steel rods differ from ordinary rolled round bars; they are specialized new types of wear-resistant steel rods designed for use in rod mills and grinders, having undergone special heat treatment. Their wear resistance is 4-6 times that of ordinary steel rods, resulting in significant economic benefits. The steel rods currently in use in the market are produced by steel mills through rolling processes; they require low technical standards, have extremely poor wear resistance, and result in high consumption during use, leading to significant waste of ** resources. The main problems are as follows: 1. High wear: Due to low hardness and poor toughness, the consumption of round steel is very high, which in turn increases the workload and costs in the magnetic separation process, and even affects product quality. 2. Sharp ends at both sides: The sharpness of the steel rod’s ends is caused by various factors. The main reason is that the ends of the steel rod in a rod mill come into contact with the material for longer periods and over a larger area compared to the middle section, resulting in a longer effective grinding time at those ends. Once there is a noticeable difference between the condition of the ends and the middle section that can be seen with the naked eye, such a steel rod is considered “failed,” as it can no longer perform effective grinding functions inside the mill. 3. Broken rod: The reason is porosity within the material. Regarding the issues with steel billets in steel mills, only very large-scale mills are able to meet the stringent technical requirements involved, especially for those with a diameter of over 70 mm. While most mills can produce such billets, their compression ratio and hardenability are low, meaning that their structure is not dense enough. Furthermore, since the internal stresses in the round steel bars are not relieved at the time of production, the breaking of these bars occurs as if by explosion, starting from the inside. The process of producing steel bars in factories is similar to inflating a balloon; it is necessary to relieve the internal stresses in order to prevent the bars from breaking. 4. Bent rod: The main reason for bent rods is that round steel has very low hardness and is relatively soft; therefore, it is prone to bending when subjected to external forces such as impacts in a grinder. Once one of the rods bends, it disrupts the parallel arrangement of the steel rods inside the mill (the rods run parallel to each other within the mill, and as material passes through the gaps between them, it is ground into small particles or powder). In mild cases, this disruption leads to reduced efficiency of the mill; in severe cases, the rods may be thrown out of the mill, posing a threat to the safety of the workers and causing damage to the mill as well as other production equipment. 5. Low production efficiency, and the qualified products do not meet the requirements. This problem plagues many companies for various reasons, and steel bars also have a significant impact on it. For example, issues such as an unreasonable ratio between steel rods of different diameters, inappropriate filling amounts, improper addition of steel rods, and failure to remove defective rods in a timely manner. Our company invested heavily to hire various experts to study this product, with the aim of developing steel rods with higher wear resistance to replace the current consumable steel rods in use domestically. After years of research, production equipment for new types of alloy wear-resistant steel rods, as well as manufacturing processes for grinding rods made of different materials, have finally been developed. The wear resistance of this wear-resistant steel rod is 4 to 6 times that of a rod made by rolling. Each year, it is possible to **save hundreds of thousands of tons, or even tens of millions of tons, of steel. Huamin’s wear-resistant rod production process: Communicate with the customer to understand their requirements for the steel rods, after which the material, model, and quantity are determined; large-scale steel mills supply the raw materials; the raw materials are inspected upon arrival at the factory; they undergo quenching and other heat treatment processes using the balancing method; further heat treatment steps are carried out; the products are inspected, stored, and then the customer is followed up with. The new type of wear-resistant steel rod produced using the equipment and processes developed by our company boasts a wear resistance 4 to 6 times that of round steel, addressing issues such as high wear, rod breakage, rod bending, and sharp ends at both ends. The size specifications can be adjusted to meet the customer’s requirements, enhancing flexibility and eliminating unnecessary waste. At the same time, it extends the service life, improves the production efficiency of the mill, reduces production costs, and lessens the workload on workers. This wear-resistant steel rod has the following features: (1) Its wear resistance is 1.5–2 times that of steel rods made by rolling, offering excellent wear resistance and helping customers save a significant amount of cost. (2) Produced using the latest methods, the size specifications can be adjusted to meet customer requirements, thereby enhancing flexibility and eliminating unnecessary waste. (3) It extends the service life, reduces costs, lessens the workload on workers, eliminates the need to worry about stopping the grinder daily to insert steel rods, and also **increases production. Introduction to key parameters: 1. Diameter: 18mm–110mm. 2. Length: 2.5m–7m. 3. Hardness: Can be adjusted according to customer requirements; for standard products, the hardness is between HRC45 and 55. 4. The raw materials are sourced from large domestic steel mills, and round bars with special chemical compositions can be manufactured as per customer requests. We welcome customers from home and abroad to visit our company for discussions. We are committed to providing high-quality products, timely delivery, competitive prices, and satisfactory service as the foundation for long-term cooperation. Zhang Xun, Shandong Huamin Steel Ball Co., Ltd. 13953147415 QQ: 549551716 Answers to common questions: 1. Analysis of broken or bent rods: (1) Causes: A. Material: internal porosity. Regarding the issues with steel billets in steel mills, only very large-scale mills are able to meet the stringent technical requirements involved, especially for those with a diameter of over 70 mm. While most mills can produce such billets, their compression ratio and hardenability are low, meaning that their structure is not dense enough. B. Process: The internal internal stress has not been relieved. Bar breakage is like an explosion – it starts from within. The principle behind steel mills’ production of steel bars is similar to blowing up a balloon; it is necessary to eliminate the internal stresses in order to prevent bar breakage. (2) Solution: A. Focus on the materials. a. Try to use materials from **super-large steel mills** ； b. The new alloy material developed by our company (Huamin Grinding Rods) was specifically created by industry experts in wear resistance from Tsinghua University and Dalian University of Technology, taking into account the conditions under which rod mills operate. It possesses excellent hardenability, and is produced by a **very large steel factory (under a confidential agreement). B. Treatment Process: The steel rod treatment process developed independently by our company (Huamin Grinding Rods) has been granted a **patent**; it significantly enhances the wear resistance of the steel rods and prevents breakage. C. Dimensions: The specifications can be adjusted flexibly. Generally, the steel bars supplied by steel mills are 6 meters long; if you use 4-meter long bars, the 2 meters that remain will be wasted. Our company (Huamin Grinding Rods) can produce bars to custom lengths. 2. Hardness analysis of wear-resistant steel rods: The optimal hardness for these rods is between 45-50; values below this range result in the rods being too soft and not wear-resistant, while values above this range make them too hard and brittle, prone to breaking ； Furthermore, in terms of manufacturing processes, domestic manufacturers can only achieve an HRC hardness of over 45 on the surface of the steel rod for a maximum of one centimeter; once that 1 centimeter is ground, the surface becomes identical to that of a round steel bar. Our company (Huamin Wear-Resistant Steel Rods) produces wear-resistant steel rods for rod mills in accordance with international standards. Moreover, thanks to our proprietary manufacturing process (which has been granted a **patent**), the overall performance of these steel rods can be improved. For example, while ordinary steel rods have a surface hardness of HRC 45 and an internal hardness of HRC 10, our rods can achieve a surface hardness of HRC 50 and an internal hardness of HRC 25. 3. Differences between wear-resistant steel rods, steel rods, and round bars: Round bars are raw materials produced by steel mills; they are not finished products. Using them as steel rods for rod mills leads to various problems such as rod breakage and failure (with sharp ends at both ends). Their hardness is only 20, meaning they are not wear-resistant at all! Steel bars are produced through further processing of round steel; their surface hardness is 45-50, making the surface wear-resistant while the interior is not. In conclusion, wear-resistant steel rods are the true steel rods suitable for rod mills

1. Professional from steel rod manufacturers: Zhang Xun from Huamin – that’s me, the only manufacturer in China specialized in steel rods for mills； 2. Steel rod material: (1) In the past, 65Mn hot-rolled round bars were commonly used; their hardness was around HRC20. Their performance was such that they were not wear-resistant, and breakage of the rods was a serious issue ； (2) We now recommend 60Mn: Through our special processing, its hardness can reach HRC45-55, resulting in increased strength. Don’t assume that higher hardness means greater susceptibility to breakage; we guarantee that this product reduces the risk of rod breakage by half compared to previous versions, and it is also more wear-resistant ； (3) RCAB series steel rods: Huamin has independently developed these special steel rods with a hardness of HRC25-35. Although their hardness is lower than that of the products in (2), their wear resistance is still quite good; the tendency for breakage is the same as that of the products in (2) ； 3. Standards: Since this is a new product in this product line, there are no existing standards to follow. If we have to specify a standard, since only our company produces these special steel rods, could our own standards be used? Pay attention to my signature, haha. I hope this can help you. Most importantly: I can reduce the number of broken rods by at least half for you! I blow? I’m a real man who never makes empty promises; if the length is less than what I promised, I’ll cover the difference at no cost to you – no doubts about it!