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Forging steel ball and casting steel ball performance characteristics

Now let's analyze the performance characteristics of forged steel ball and cast steel ball:

1. Forged steel ball: good surface quality, impact resistance, toughness, wear resistance, not broken and missing round. Is the metal heating temperature of 1050 ℃ (plus or minus 50 degrees), the use of forging presses the metal blank to produce plastic deformation to obtain a certain mechanical properties, a certain shape and size forging processing methods. Forging (forging and stamping) one of the two major components. By forging can eliminate the metal in the smelting process resulting loose castings and other defects, optimize the microstructure, at the same time due to save the integrity of the metal streamline, the mechanical properties of forgings generally better than the same material castings. Related machinery, high load, the working conditions of critical parts, in addition to the shape of the more available rolled sheet, profile or welded parts, the use of more forgings. In addition, the forged steel ball wear must be the most wear-resistant materials, such as the national standard of 60Mn, 65Mn, or some companies independently developed high wear-resistant alloy steel materials, we use the country's large steel production of steel, is also a Materials, produced in different steel mills are not the same quality, and the quality of forgings 80% good or bad depends on the quality of the material, such as the use of high manganese steel, good impact resistance, toughness, good wear resistance, Not easy to break. Forged steel ball because of cheap, economical and durable features favored by the majority of users, such as the international mining giant Rio Tinto, BHP Billiton, Angul Gold, etc. are forged steel ball.

Forging production features:

(1) forging the heated metallic material into various shapes of tools, mechanical parts or blank, which means forging. Forging can change the internal structure of metal materials, refined crystal, improve its mechanical properties.

(2) forging production must use heating equipment, forging equipment and many auxiliary tools.

(3) forging equipment are steam hammer, air hammer, die forging hammer, mechanical hammer, plywood hammer, spring hammer, belt hammer, crank press, friction press machine, reaming machine, roll forging machine.

2. Cast steel ball:

First, the high chromium ball quality indicators: chromium content ≥ 10.0%, carbon content of 1.80% -3.20% are called high chromium ball, the national standard requires high chromium ball hardness (HRC) must be ≥ 58 or more, the impact value ak≥3.0J / ㎝2, if the hardness of the high chromium ball must be high temperature quenching + tempering (the current domestic high chrome ball quenching oil quenching and wind quenching two quenching methods), such as the detection hardness (HRC) below 54 The following description of high-chromium ball is not quenched.

Second, the quality indicators in chromium ball: chromium content of 3.0% to 7.0%, carbon content of 1.80% -3.20% are called in the chrome ball impact value ak ≥ 2.0J / ㎝ 2, the national standard requirements of chromium Ball hardness (HRC) must be ≥47 or above. To ensure the quality of steel ball, the ball should be tempered at high temperature (to eliminate the casting stress). If the surface of ball is dark red, it indicates that the product has been tempered at high temperature, Such as steel ball surface is still metallic character shows that the product is not tempered. Third, the low chromium ball quality indicators: 0.5% ~ 2.5% chromium content, carbon content of 1.80% -3.20% are called low chromium ball, the national standard requires low chromium ball hardness (HRC) must be ≥ 45 or more, Impact value ak ≥ 1.5J / ㎝ 2, in order to ensure the quality of steel ball ball is also low-quality high-temperature tempering chrome ball (in order to achieve the purpose of eliminating casting stress), such as steel ball surface was dark red indicates that the product has been tempered , Such as steel ball surface is still metallic character indicates that the product is not tempered high temperature.

• Classification and explanation of hardness of steel ball
• The advantages of forging steel ball and rolling steel ball