Effect of deep cryogenic treatment on the microstructure ...

Therefore, in order to make the hardness of 50mm high chromium white cast iron grinding ball larger than 60HRC, the optimum austenitizing temperature and holding time are fixed range. Because if the temperature is lower or holding time is not enough, the white cast iron is not fully austenitized and its hardness is lower after quenching.

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A process for producing a low alloy white cast iron is disclosed. The process comprises the steps of selecting one of a group of four alloying elements for a nickel, molybdenum/copper or modified low alloy iron; the four alloying groups consisting essentially, by weight percent of about: Group 1: 2.5 to 4.0% carbon; 0.3 to 0.8% silicon; 0.3 to 0.8% manganese; 0.75 to 2.0% nickel; 0 to 0.75% ...

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Ni-Hard Type I to IV: Nickel-Chromium White Irons: These have 3-5% Ni, 1-4% Cr (Ni-hard IV has 7-11% Cr). Ni-hard IV with 3.2% C, 9% Cr, 6% Ni has 410 BHN hardness, 690 MPa, compressive yield strength, 160 J unnotched impact energy in the austenite state; 750 BHN hardness, 2450 MPa compressive yield strength, 170 J unnotched impact energy in ...

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2.1. High-chromium white cast iron characteristics. High-chromium white cast irons are ferrous alloys containing 11-30% Cr and 1.8-3.6% C along with variable amounts of molybdenum, manganese, copper and nickel [1]. The standard procedure most commonly used for the classification of this kind of cast iron alloy is ASTM A532-10 (2014).

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Medium 6 was cast, 1-in-diam, 22-pct-Cr balls. Small amounts of manganese, nickel, and copper were also present. These had a surface hardness of Rockwell C 63. Medium 7 was cast, 1-in-diam, 29-pct-Cr white iron balls. These balls contained small amounts of manganese, nickel, and copper. Surface hardness was Rockwell C 60.

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Metallurgical Aspects of HIGH

Because the grinding takes place through the impact and friction of the balls, balls with a high wear resistance are desirable and the materials of choice are the high-chromium white cast irons.

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Influence of Heat Treatment on Structure and Properties of ...

As grinding balls, mill liners, pulverizer rings and roll heads, slurry pump parts, ... nickel and chromium to give high hardness and outstanding resistance to abrasion. There are two ... lab test with the ratio of the hardness of white iron to the abrasive hardness1,2

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「high chromium cast iron grinding balls」 High chromium alloy high chromium white cast iron grinding ball and high chromium steel as the high chrome ball At present most of the domestic wear resistant material enterprises are the intermediate frequency electric furnace Through reasonable match after melting of high quality scrap steel chromium alloy material Inquire Now

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USA US452884A USA USA US A US A US A US 452884 A US452884 A US 452884A US A US A US A US A US A US A Authority US United States Prior art keywords alloy carbon chromium grinding columbium Prior art date Legal status (The legal status is an assumption and is …

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White Cast Iron

grinding balls were cast with the test alloy as well as with high chromium iron for comparison of the properties. To select the optimum temperature range and time for destabi-

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Jul 16, 2020· Martensitic nickel white iron. ASTM A532-I is a class of martensitic nickel white iron. In low-alloy white iron, a matrix is made of pearlite. Pearlite is relatively soft and has low wear resistance. To increase the wear resistance of white cast iron, the Pearlitic matrix is shifted to martensite by introducing Nickel and Chromium in it.

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Wear resistance of high chromium white cast iron for coal ...

Wear resistance of chromium cast iron - Research paper. of chromium cast iron microstructure and its resistance on erosion wears. Separate part of ... into account different combination of chemical composition its ... these cast irons in group of materials with very high abrasive wear ..... chromium and nickel-chromium on ball 30 and 100 mm .... iron on coal pulverizer elements.

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The microstructure of high chromium white cast iron grinding ball as-cast and after heat treatment was observed by metallographic microscope The sample of 10mm* 10 mm* 8 mm in size at the center of the grinding ball was cut by weld and polished with 200 # to 1500 # metallographic sandpaper.

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nickel chromium white iron grinding balls. nickel chromium white iron grinding balls - Cast iron - Wikipedia, white cast iron has carbide impurities, with nickel, copper, and chromium to form, mills and autogenous grinding mills, balls . Read more

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grinding balls chilegrinding balls chromium. grinding balls chilegrinding balls chromium. special high chromium grinding ball of item grinding balls chilegrinding balls chromium,Special High Chromium Grinding Balls are widely used in cement building materials, metal mines, and other industries for powder preparation and superfine processing The hardness reaches 60 HRC, and the

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Nickel-chromium white ... greater toughness. A special grade, class J type C, has been developed for producing grinding balls and slugs. Here, the nickel-chromium alloy composition has been adapted for chill casting and specialized sand casting processes. The Class I type D (Ni-Hard 4) alloy is a modified nickel-chromium iron that contains ...

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Heat Treatment of White Cast Irons | Metallurgy

High Chromium cast iron grinding balls are widely used in cement, mining, thermal power generation, etc. To improve the production and heat treatment process of grinding balls and actively explore the relevant laws in the production process has a good guiding role for the actual production.

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NICKEL-CHROMIUM WHITE IRONS The oldest group of high-alloy ironsofindustrialimportance,the nickel-chromium white irons (Ni-Hard irons), have been produced for more than 50 years and are cost-effective materials for crushing and grinding. In these martensitic white irons, nickel is the primary alloying element, because3 to5%Niiseffectivein

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Alloy data sheet high chrome white iron 25% | Penticton ...

Dec 12, 2019· Liner and high hardness low chromium alloy grinding balls. However, grinding balls with a diameter greater than 110mm should be considered using high carbon alloy steel forging balls. The matching of the liner and the grinding ball should be from the viewpoint of "substrate system". Under the premise that the service life of the liner is ...

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1 High chromium cast iron

As grinding balls, mill liners, pulverizer rings and roll heads, slurry pump parts, ... nickel and chromium to give high hardness and outstanding resistance to abrasion. There are two ... lab test with the ratio of the hardness of white iron to the abrasive hardness1,2

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Because the grinding takes place through the impact and friction of the balls, balls with a high wear resistance are desirable and the materials of choice are the high-chromium white cast irons.

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Nickel-chromium white ... greater toughness. A special grade, class J type C, has been developed for producing grinding balls and slugs. Here, the nickel-chromium alloy composition has been adapted for chill casting and specialized sand casting processes. The Class I type D (Ni-Hard 4) alloy is a modified nickel-chromium iron that contains ...

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The Selection Design and Application of Mill Liners for ...

high chrome grinding balls for mining. The grinding media may be the ore itself (autogenous grinding) bars balls is the major wear mechanism in mining as well as in mineral processing operations 11 . . used for grinding bodies are steel and high chromium white cast iron.

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Grinding Media Corrosion Rate

ASTM A532 Class III Type A. The 25% Cr alloy is the most common high chrome white iron poured at Penticton Foundry. This alloy has great abrasion resistant properties especially against gouging, grinding and scratching. 25% Cr material can be machined to meet tighter tolerances like those found in pump and piping type castings.

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