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Manufacturing method for hydraulic castings produced through non-alloyed high-strength gray cast iron

A non-alloyed, high-strength technology, applied in the field of materials, can solve problems such as low comprehensive performance, high carbon content in furnace charge, and unspecified cooling time of castings

Inactive Publication Date: 2015-11-25
ANHUI DATIAN CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a problem of low performance stability when preparing HT250 and HT300 high-strength cast iron under non-alloying conditions
[0003] And the application document with the application number 201310635061.0 "A Preparation Method of High-Strength Gray Cast Iron Material" also provides a preparation method of high-strength gray cast iron material, but the charge has a high carbon content and cannot leave room for carbon increase treatment. , cannot reduce the supercooling degree, and the overall performance is not high
At the same time, the application does not stipulate the cooling time of the castings, which can easily cause large fluctuations in the structure of the castings and unstable quality, resulting in the failure to guarantee the fatality and processability of the castings.

Method used

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  • Manufacturing method for hydraulic castings produced through non-alloyed high-strength gray cast iron
  • Manufacturing method for hydraulic castings produced through non-alloyed high-strength gray cast iron
  • Manufacturing method for hydraulic castings produced through non-alloyed high-strength gray cast iron

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Step 1. Determine that the material HT250 is the BZZ full hydraulic steering gear valve body, the required chemical composition and the relationship between the elements: C: 3.15-3.25%, Si: 2.10-2.20%, Mn: 0.80-0.90%, P <0.1%, S: 0.08~0.12%, CE: 3.86~3.94%, the rest is Fe; and, ω(Si) / ω(C): 0.68~0.69, the difference between Si-Mn is 1.3, inoculated silicon and The ratio of total silicon: ω(Si pregnant) / ω(Si final) is 0.2~0.3.

[0030] Step 2: Smelting in an intermediate frequency induction furnace: 80% carbon scrap steel and 20% recycled material are used as the furnace charge; among them, the carbon scrap steel contains the following chemical components in mass percentages: C: 0.2%, S: 0.2%, Mn: 0.4% , the returned material is the same grade as the casting. Place the returned material on the bottom of the furnace, and place the scrap steel on the returned material;

[0031] When one-third of the charge is melted, add a graphitized recarburizer whose weight is scrap st...

Embodiment 2

[0050] Step 1. Determine the BM series cycloidal hydraulic motor valve body made of HT300, the required chemical composition and the relationship between the elements: C: 3.10-3.20%, Si: 2.10-2.20%, Mn: 0.85-0.95% , P<0.1%, S: 0.08~0.12%, CE: 3.86~3.94%, the rest is Fe; the ω(Si) / ω(C): 0.68~0.69, the difference between Si-Mn is 1.25, and the incubating The ratio of silicon to total silicon: ω (Si pregnant) / ω (Si final) is 0.25 to 0.35.

[0051] Step 2: Smelting in an intermediate frequency induction furnace: 80% carbon scrap steel and 20% recycled material are used as the furnace charge; among them, the carbon scrap steel contains the following chemical components in mass percentages: C: 0.2%, S: 0.2%, Mn: 0.4% , the returned material is the same grade as the casting. Place the returned material on the bottom of the furnace, and place the scrap steel on the returned material;

[0052] When one-third of the charge is melted, a graphitized recarburizer whose weight is 2t*2.74%...

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Abstract

The invention relates to a manufacturing method for hydraulic castings produced through non-alloyed high-strength gray cast iron. The method comprises the following steps that firstly, the mutual relation of elements and chemical components needed by the castings are determined; secondly, a medium-frequency induction furnace is adopted for smelting; thirdly, a stokehole molten iron transfer ladle is used for furnace charge to be mixed with alloy and steel scrap; fourthly, three-level inoculation is performed on molten iron; and fifthly, the cooling time is controlled to obtain the castings HT250 and HT300. On the non-alloyed premise, the high carbon equivalent is adopted, full steel scrap smelting silicon carbide increasing treatment is performed, a graphitizing carburant is used for adjusting the carbon quantity for synthesizing cast iron, the number of crystal nucleuses and the amount of cast iron are increased, the graphite form is improved, the overall molten iron quality is improved, and therefore the high-strength gray cast iron hydraulic castings HT250 and HT300 are stably obtained.

Description

technical field [0001] The invention relates to a preparation method for producing hydraulic castings from non-alloyed, high-strength gray cast iron, in particular to a preparation method for producing high-strength gray cast iron HT250 and HT300, which belongs to the field of material technology. Background technique [0002] Gray cast iron refers to cast iron with flake graphite, because the fracture is dark gray when broken, so it is called gray cast iron. The main components are iron, carbon, silicon, manganese, sulfur, and phosphorus. It is the most widely used cast iron, and its output accounts for more than 80% of the total output of cast iron. Among them, HT250 and HT300 are pearlitic gray cast iron. It has high strength, good wear resistance and vibration damping performance. Therefore, this material is widely used in the manufacture of box-like structural parts such as engine blocks, cylinder heads and machine tools. However, it has a large white mouth tendency an...

Claims

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Application Information

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IPC IPC(8): C22C37/10C22C33/08C21C1/08B22D1/00
CPCY02P10/20
Inventor 潘俊任聿星
Owner ANHUI DATIAN CASTING
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