Manufacturing method of cast acicular constiteont alloy ash cast iron cylinder jacket

A manufacturing method, bainite technology, applied to cylinders, cylinder heads, engine components, etc., can solve the problems of bainite difficulty, and achieve the effects of reducing foreign exchange expenses, low fuel consumption, and reducing production costs

Inactive Publication Date: 2004-05-05
ZYNP GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, this material can only be obtained by austempering, and it is very difficult to obtain bainite in the as-cast state

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0013] 1. Process

[0014] 1. Ingredients, chemical composition controlled at C 2.6-3.3%, Si 1.7-2.5%, S≤0.1%, P≤0.15%, Mn≤0.8%, Ni 0.8-1.5%, Mo 0.6-1.0% (strength higher than 380Mpa high strength gray cast iron bainite) or C 2.8~3.3%, Si 1.7~2.5%, S≤0.1%, P≤0.15%, 0.5≤Mn≤0.9%, Ni 0.3~0.5%, Mo 0.6~1.0% Cu+Ni≥1.0% (Grey cast iron bainite with strength higher than 350Mpa)

[0015] 2. Fire inoculation: use silicon barium inoculant to inoculate in the process of tapping molten iron, and the inoculation amount is 0.4-0.9%.

[0016] 3. Pour an appropriate amount of molten iron into the mold of the centrifugal pouring machine. After 10-30 seconds, water the casting mold for 30-70 seconds to cool the cylinder liner, and push the blank out of the mold when the temperature of the blank drops below 850°C.

[0017] 4. Cooling: put the blank on the cooler, air-cool or air-cool for 3-6 minutes to reduce the temperature of the blank to 400-500°C (low alloys must be air-cooled), and rough-...

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PUM

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Abstract

A technology for manufacturing the cast bainite alloy-gray cast iron cylinder sleeve includes using pig iron No.18 and high-grade waste steel to smelt molten iron containing C (2.6-3.3%), Si (1.7-2.5), S (0-0.1) and P (0-0.15), adding alloy elements: Mn (0-0.8%), Ni (0.8-1.5) and Mo (0.6-1.0), centrifugal casting, cooling to 400-500 deg.C for 3-6 min, slow cooling, tempering at 500+ / -20 deg.C, holding the temp for 1.5-3 hr, and cooling at 40-120 deg.c / hr.

Description

technical field [0001] The invention relates to a manufacturing method of a cast bainite alloy gray cast iron cylinder liner. Background technique [0002] With the development of science and technology, the requirements for automobile and construction machinery engines are getting higher and higher. As the heart of the engine, the cylinder liner puts forward higher requirements for its material. The traditional phosphorus alloy cast iron cylinder liner and boron alloy cast iron cylinder liner , molybdenum-chromium-copper alloy cylinder liners, molybdenum-nickel-copper alloy cylinder liners, etc. are increasingly unable to meet the requirements of high-power and high-performance engines. For example, the Cummins C series engine is a joint venture between Dongfeng Group Corporation of my country and Cummins Corporation of the United States. Imported from Cummins Corporation of the United States The world's advanced medium and heavy-duty engines have the characteristics of advan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D13/02F02F1/08
Inventor 候起飞孙世贵党增军王中营
Owner ZYNP GRP
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