hot sale & high quality steel forged grinding balls grinding milling machine ball

quality grinding steel balls & grinding media balls factory from china

quality grinding steel balls & grinding media balls factory from china

Established in 2000, We Jinan Zhongwei casting and forging grinding ball Co.,Ltd, are leading manufacturer and professional exporter of grinding media balls in China. with the annual output of 50,000 ...

JINAN ZHONGWEI CASTING AND FORGING GRINDING BALL CO.,LTD 18 Years Focus on Development and Production of Grinding Media 2000 Established Jinan Zhongwei Casting And Forging Grinding Ball Co.,Ltd 2004 Adding 20-25mm hot rolling Auto production line. 2008 Our products are widely...

Professional: Just tell us your requirements, our engineers can suggest the suitable material for you. Easy: As our clients, all you have to do is choose, not answer a lot of boring questions. Prompt: You can get a reply within one hour in working day, within 5 hours in holidays. About delivery d...

Jinan Zhongwei Casting & Forging is made up of a highly qualified professional team, with professional top talent and technology together. We have R & D Dep., QC Dep., Production Dep., Sales Dep., and After-sales service Dep., as the expansion of our business, we must will do our best to meet your needs, and welcom more friends come t...

differences between cast and forged grinding ball?

differences between cast and forged grinding ball?

The ball mill grindingball on the market now can be divided into two kinds according to the manufacturing process: Cast grindingBall and forged steel ball, but their wear degree is not the same. Due to crushing and pulverizing materials, grindingballs need good abrasion resistance and enough impact toughness, and require steel balls cannot be broken, ball mill grindingballs can be divided into:

1. Quality index of High Chromium grinding balls: Chromium content 10.0%-12.0 %, carbon content between 1.80%-3.20% are called high chromium grinding balls, the national standard requires hardness (HRC) of high chromium grindingballs 58, impact value AK 3.0 j / 2. If the hardness high chromium grindingball must adopt high-temperature quenching + tempering treatment (at present domestic high chromium grindingball quenching oil quenching, wind quenching, water solution, and other quenching methods), if the hardness (HRC) is below 54, then the high chromium grindingball has not been quenched.

2. Ultra-high Chromium grindingBall Quality Index: Chromium contents12.0%-28.0 %, carbon contentsbetween 1.80%-3.30% are all called high chromium grindingball, the national standard requires high chromium grindingball hardness (HRC) must 58, impact value AK 3.0 j / 2.If the hardness of the ultra-high Chromium grindingBall must adopt high-temperature quenching + tempering treatment (at present, there are two quenching methods of oil quenching and wind quenching for ultra-high Chromium grindingBall), if the hardness (HRC) is below 54, the ultra-high chromium grindingball has not been quenched.

3. Medium Chromium grindingBall Quality Index: the chromium content is 3.0-7.0 %, the carbon content is 1.80%-3.20% is called medium chromium grinding ball, the national standard request medium chromium grinding ball hardness (HRC) must 47 above, the impact value AK 2.0 j /cm 2, high-temperature tempering or vibratory stress relief (VSR) is used to improve the quality of grinding balls. If the grinding ball surface dark red indicates that the product has been high-temperature tempering, if the grinding ball surface is still metallic color indicates that the product is not high-temperature tempering.

4. Low Chromium Grinding Balls Quality Index: containing 0.5% ~ 2.5% chromium, containing 1.80% ~ 3.20% carbon are called low chromium grinding balls, national standard requirements low chromium grinding balls hardness (HRC) must 45, impact value AK 1.5 j /2. In order to ensure the quality of grinding ball, low chromium grinding ball should be tempered at high temperature or vibratory stress relief (in order to eliminate casting stress). If the grinding ball surface dark red indicates that the product has been high-temperature tempering, if the grinding ball surface is still metallic color indicates that the product is not high-temperature tempering.

5.Quality Index of forged steel balls: 0.1% ~ 0.5% chromium content (forged steel balls generally do not contain chromium) , carbon content is below 1.0% and steel balls are made of high temperature forging Some forging steel ball surface hardness (HRC) although can reach 56 above (quenching layer only about 15) , because the forging steel ball material hardenability is poor the core hardness is generally only more than 30 degrees. Under normal conditions, water quenching is often used for forging steel balls, so the broken rate of forged steel balls is very high.

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