1 5j cm2 impact value low chrome cast iron grinding media ball

classification of cast steel balls

classification of cast steel balls

The ball mill steel balls on the market can be divided into two according to the manufacturing process: casting and forging, but their wear resistance is different. Due to the crushed materials, the steel balls need good wear resistance and enough. Usually, alloy steel, high manganese steel, cast iron and ferrochrome are used for forging or casting. It is more economical to match the corresponding heat treatment process. , Ball mill steel balls can be divided into:

The chromium content of the high chromium ball is greater than or equal to 10.0%. The carbon content is between 1.80% and 3.20%. According to national standards, the hardness of the high chromium ball must be no less than 58hrc, and the impact value should be greater than or equal to 3.0j/cm2. To achieve this hardness, the high chromium ball must be quenched and tempered at high temperature.

At present, there are two methods for quenching high chromium balls in China, including oil quenching and wind quenching. If the test hardness of the high chromium ball is lower than 54HRC, it means that it has not been quenched.

China Chromium Ball stipulates that the chromium content ranges from c.0% to 7.0%, and the carbon content is between 1.80% and 3.20%. Its impact value should not be less than 2.0j/cm2. National standards require that the hardness of the chromium ball should be greater than or equal to 47hrc. In order to ensure quality, medium chromium balls should be tempered at high temperature to eliminate casting stress.

If the surface of the steel ball is black and red, it proves that the steel ball has undergone high temperature tempering treatment. If the surface of the steel ball still has the metal color, we can judge that the steel ball has not undergone high temperature tempering treatment.

Generally speaking, the chromium content of low chromium balls ranges from 0.5% to 2.5%, and the carbon content ranges from 1.80% to 3.20%. Therefore, according to national standards, the hardness of the low chromium ball should be no less than 45hrc, and the impact value should be no less than 1.5j/cm2.

Low chromium balls also need high temperature tempering treatment to ensure quality. This treatment can eliminate casting stress. If the surface of the steel ball is dark red, it indicates that it has undergone high temperature tempering treatment. If the surface is still metallic, it indicates that the steel ball has not undergone high temperature tempering.

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casting grinding ball - grinding media manufacturer from china

casting grinding ball - grinding media manufacturer from china

We are a manufacturer specializing in the production of grinding steel balls for mines. The application of our advanced technology and strict control of all aspects of the heat treatment process maximizes wear performance and impact resistance.

The chromium content of the high chromium ball is greater than or equal to 10.0%. The carbon content is between 1.80% and 3.20%. According to national standards, the hardness of the high chromium ball must be no less than 58HRC, and the impact value should be greater than or equal to 3.0j/cm2. To achieve this hardness, the high chromium ball must be quenched and tempered at high temperature.

The specified chromium content of the medium chromium ball ranges from 3.0% to 7.0%, and the carbon content is between 1.80% and 3.20%. Its impact value should not be less than 2.0j/cm2. According to national standards, the hardness of the chrome ball should be greater than or equal to 47hrc. In order to ensure the quality, the medium chromium ball should be tempered at high temperature to eliminate the casting stress.

Generally speaking, the chromium content of the low chromium ball is 0.5% to 2.5%, and the carbon content is from 1.80% to 3.20%. Therefore, according to the national standard, the hardness of the low chromium ball should be no less than 45hrc, and the impact value should be no less than 1.5j/cm2. Low chromium balls also need high temperature tempering treatment to ensure quality. This treatment can eliminate casting stress.

We use advanced equipment to ensure more accurate temperature, forging time and thermal process control. And the steel ball diameter, hardness, impact value, and microstructure are tested to make all the indicators meet the requirements of use.

moly corp grinding balls for ball mill media , cast forged steel grinding balls

moly corp grinding balls for ball mill media , cast forged steel grinding balls

Manufacturer :Jinan Zhongwei Certificate : ISO 9001 : 2008 Annual output : 50000 Tons Location : Zhangqiu , China Our Services We supply forged steel grindingballs with diamater 20mm-150mm. We supply casted iron grindingballs with diamater 20mm-150mm. We supply grinding rods made by C45 Steel ,60Mn Steel,B2 Steel,B3 Steel. We supply grinding cylpeb (Cylinder) with High Chrome,Low Chrome,Medium Chrome Type and Chemical Composition of Forged grinding Ball Name Material C Mn Si Cr S P ZW-1 50Mn 0.48-0.56 0.70-1.0 0.17-0.37 0.25 0.035 0.035 ZW-2 60Mn 0.57-0.65 0.70-1.0 0.17-0.37 0.25 0.035 0.035 ZW-3 65Mn 0.60-0.70 0.90-1.2 0.17-0.37 0.25 0.035 0.035 ZW-4 B2 0.70-0.85 0.70-0.80 0.17-0.37 0.2-0.7 0.03 0.03 ZW-5 75SiMn 0.70-0.90 0.70-1.20 0.4-0.8 0.25 0.03 0.03 ZW-6 Wear-resistant Alloy 0.50-0.65 0.4-1.0 1.4-1.8 0.9-1.2 0.03 0.03 Type and Chemical Composition of Cast iron grinding Ball NAME BRAND CHEMICALCOMPOSITION(%) C Si Mn Cr Mo P S High Chromium Cast Ball ZQCr26 2.0-3.4 1.2 1.5 22-28 1.5 0.10 0.10 ZQCr20 2.0-3.4 1.2 1.5 17-22 1.5 0.10 0.10 ZQCr17 2.0-3.4 1.0 2.5 15-17 1.5 0.10 0.10 ZQCr13 1.7-3.4 1.0 2.5 11-14 1.5 0.10 0.10 Physical Property of Forged grindingBall Name Material Impact Test(Ak.J/cm) Endurance Test Times(5m/T) Surface Hardness (25mm- 60mm) Core Hardness (25mm- 60mm) Surface Hardness (70mm- 100mm) Core Hardness (70mm- 100mm) Breakage ZW-1 50Mn 12 10000 56 35 56 28 <1% ZW-2 60Mn 13 10000 58 38 58 29 <1% ZW-3 65Mn 15 12000 60 42 60 30 <1% ZW-4 B2 17 12000 60 52 60 50 <1% ZW-5 75SiMn 16 12000 60 50 60 48 <1% ZW-6 Wear-resistant Alloy 17 12000 60 54 60 52 <1% PhysicalPropertof Cast Iron GrindingBall MAME BRAND HARDNESS IMPACTVALUE ak(J/cm2) METALLOGRAPHIC ORGANIZATION BALLS FATIGUELIFE QUENCHINGSTATE(A) NO-QUENCHINGSTATE(A) IMPACT High Chromium Casting Ball ZQCr26 60 45 4.0 M+C 8000 ZQCr20 60 45 3.5 8000 ZQCr17 60 49 3.0 8000 ZQCr13 60 50 2.3 8000 Grinding BallPackaging Tonbags(1000KgPerBag) Irondrums (850~920KgPerDrum) Grinding media balls GrindingMedia Balls AppliedFields 1.Mining 2.CementPlants 3.ChemicalIndustries 4.PowerStations Shippinganddelivery Portofloading:QingdaoPort,China Deliverytime:Normally2-3weeksafterdownpaymentreceived. Partialshippmentallowed FAQ Paymentterms:T/T(30%DP,balanceagainstcopyofB/L.;L/C Samples:Freesamplesareprovidedfortestbeforetrialorder MOQ:1Ton Formoreinformationaboutourproducts,Plsfeelfreetocontactus.

heat treatment process for high chromium grinding ball

heat treatment process for high chromium grinding ball

Ball mill is widely used in building materials, mineral processing, cement, thermal power generation and fertilizer production of the main grinding equipment, grinding ball is the largest consumption of wear-resistant parts. Therefore, with the continuous development of key industries such as building materials, the demand for grinding balls will increase greatly. At present, ordinary forged steel balls are mainly used, with an average consumption of one kilogram of steel balls per ton of cement, and about two kilograms of steel balls per ton of metal ore ground This was nearly ten times more relevant than at the time. Especially as the third generation of anti-wear Alloy High Chromium White cast iron developed successfully, so that more than 4.5 m of large-scale cement mill ball consumption to 30 ~ 50 G / T, medium and small-scale cement mill ball consumption also reduced to only 100 G / T or so The new material revolution has greatly improved productivity and economic returns. It was only in the mid-1970s that I began my research on the development of cr-based white cast iron. The Xian Jiaotong University of Mn-Cr-Cu-Mo series and high-cr-based wear-resistant white cast iron were selected and developed. Since the 1980s, a variety of new wear-resistant materials developed in China have been gradually applied to the actual abrasive wear operations, some of which have reached the level of similar products abroad.

The good wear resistance of high chromium cast iron mainly depends on its matrix structure and the type and distribution of carbides. High Chromium cast iron is a kind of chromium white cast iron with chromium content between 12% -28%. This alloy of carbon and hard compounds gives high chromium cast iron good wear resistance. On the other hand, during solidification, M7C3 type carbides distribute in a rod-like shape, which can improve the toughness of high chromium cast iron to some extent. The production of high chromium cast ball is mainly composed of casting and heat treatment. Casting is mainly composition design, the casting method, carbide, and matrix structure directly, affect the wear resistance and toughness. Carbides and Metal Matrix Organization is first, by its chemical composition, so must be the reasonable design of its chemical element, content, followed by the heat treatment process

As mentioned before, high chromium grinding ball has excellent wear resistance in abrasive wear and has been widely used in many industries of national economy This is mainly because the high-chromium cast ball can obtain strong and tough matrix structure and high hardness M7C3 carbide by proper heat treatment and alloy modification. Many units at home and abroad began to choose high-chromium cast ball as a cement, mining, electricity and other industries as Abrasives, so high-chromium cast ball production technology has been the main topic of study at home and abroad.

Heat treatment of high chromium grinding ball is the main method to obtain good wear resistance. The research on high chromium cast iron ball mainly focuses on chemical composition selection, heat treatment process determination, modifier selection, good carbide type and wear mechanism. Foreign foundry researchers are more committed to the high-chromium cast iron microstructure, wear-resistant mechanism, and new preparation process development. Here are the specifications for the High Chromium Grinding Ball:

From the above indexes, it can be seen that the hardness of the grinding ball before and after quenching is quite different. The heat treatment process of high chromium cast iron grinding ball includes wind quenching, oil quenching, and special quenching solution treatment. After repeated test and mining, the oil quenching can fully meet all its technical specifications The consumption of iron ore is twice that of iron ore. The heat treatment process is the use of two-stage heat quenching and low-temperature tempering. At the rate of less than 70 C / h, the temperature is increased to 650-680 C for 2 hours, at the temperature increasing to 950 C for 4 hours, forced air-cooling, oil-cooling, and special quenching liquid cooling respectively, and tempering is carried out at 200 C or 420 C According to the ball diameter was 4 hours, 6 hours, 7 hours, out of slow cooling.

From the above indexes, it can be seen that the hardness of the grinding ball before and after quenching is quite different. The heat treatment process of high chromium cast iron grinding ball includes wind quenching, oil quenching, and special quenching solution treatment. After repeated test and mining, the oil quenching can fully meet all its technical specifications The consumption of iron ore is twice that of iron ore. The heat treatment process is the use of two-stage heat quenching and low-temperature tempering. At the rate of less than 70 C / h, the temperature is increased to 650-680 C for 2 hours, at the temperature increasing to 950 C for 4 hours, forced air-cooling, oil-cooling, and special quenching liquid cooling respectively, and tempering is carried out at 200 C or 420 C According to the ball diameter was 4 hours, 6 hours, 7 hours, out of slow cooling.

After reasonable matching of all elements, ratio casting qualified grinding ball blank, adopt continuous heat treatment furnace to ensure the uniformity of furnace temperature, select the appropriate quenching medium and tooling, the equipment to ensure the consistency of the process, to ensure the stability of product quality. Problems such as low wear resistance of high chromium grinding balls, high rate of breakage and large roundness loss were solved.

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