Smelting method for cylinder cover of marine diesel engine

A technology for marine diesel engine and cylinder head, which is applied in the field of smelting of marine diesel engine cylinder head, can solve the problems of substandard performance and low quality of the cylinder head, and achieve the effect of ensuring the breeding effect, improving the quality and reducing the content of rare earth.

Inactive Publication Date: 2013-02-06
CRRC QISHUYAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the problems of the existing cylinder heads whose performance is not up to standard and the quality is low, the present invention provides a method for smelting cylinder heads of marine diesel engines

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for smelting a cylinder head of a marine diesel engine comprises the following steps: batching→smelting raw molten iron→spheroidizing treatment→primary inoculation treatment→secondary inoculation treatment→pouring.

[0023] The steps of smelting the original molten iron include: using Q10 newborn iron and carbon steel scrap as raw materials, melting the newborn iron and carbon steel scrap at a ratio of 7:3, and superheating for 5 to 10 minutes when the melting temperature reaches 1530°C to clean the molten iron. When the chemical composition of the previous assay meets the process requirements, Mn: 0.22% is controlled, and the molten iron is tapped.

[0024] The spheroidizing treatment steps include: using the flushing method, adding 1.3% ferrite-type nodularizer to the pit of the nodularization tundish, compacting, and then using 0.2% fine ferrosilicon powder to cover the ferrite-type nodulizer Then press two small pieces of newborn iron on the upper part to d...

Embodiment 2

[0030] A method for smelting a cylinder head of a marine diesel engine comprises the following steps: batching→smelting raw molten iron→spheroidizing treatment→primary inoculation treatment→secondary inoculation treatment→pouring.

[0031] The steps of smelting the original molten iron include: using Q10 newborn iron and carbon steel scrap as raw materials, melting the newborn iron and carbon steel scrap at a ratio of 7:3, and superheating for 5 to 10 minutes when the melting temperature reaches 1530°C to clean the molten iron. When the chemical composition of the previous assay meets the process requirements, Mn: 0.26% is controlled, and the molten iron is tapped.

[0032] The spheroidizing treatment steps include: using the flushing method, adding 1.8% ferrite nodulizer into the pit of the spheroidizing tundish, compacting, and then covering the ferrite nodulizer with 0.2% fine ferrosilicon powder Then press two small pieces of newborn iron on the upper part to discharge 50%...

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Abstract

The invention relates to the technical field of marine diesel engines, and particularly relates to a smelting method for the cylinder cover of a marine diesel engine. The smelting method comprises the following steps of: proportioning, smelting original molten iron, performing spheroidization treatment, performing primary inoculation treatment, performing secondary inoculation treatment, and pouring. During smelting, a certain amount (about 0.25%) of Mn is added, so as to ensure that the content of pearlites meets technical requirements while ensuring the strength of castings; 1.3-1.8% of T-1 type spheroidizing agent is used for performing inoculation twice, and stream inoculation is performed during the secondary inoculation, so that the spheroidization rate can be increased, the spheroidization degeneration of the castings can be prevented, and the inoculation effect can be ensured; and moreover, the T-1 type spheroidizing agent is a heavy-rare-earth ferrite type spheroidizing agent capable of effectively stabilizing ferrite, ensuring the low content of rare earth, and greatly reducing the shrinkage trend of the castings.

Description

technical field [0001] The invention relates to the technical field of marine diesel engines, in particular to a method for smelting cylinder heads of marine diesel engines. Background technique [0002] The cylinder head is one of the main parts of the diesel engine. Its inner cavity has a complex structure and high technical requirements. The tensile strength of the cast sample is required to be ≥ 400Mpa, the yield strength ≥ 250Mpa, the elongation ≥ 15%, and the spheroidization rate ≥ 90 %, pearlite content < 15%, and the existing cylinder head is made of QT400-15 series castings, the spheroidization rate of single casting samples is ≤ 85%, and some pearlite content is > 15%. If the tensile strength is less than 400Mpa, it is obviously not up to the technical requirements, and the quality is low, which will affect the overall performance of the diesel engine. Contents of the invention [0003] In order to overcome the problems of substandard performance and low q...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/10C22C37/04
Inventor 张杰
Owner CRRC QISHUYAN CO LTD
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