Manufacturing method of marine crankshaft material and marine crankshaft manufactured by the method

A manufacturing method and crankshaft technology, which is applied in the manufacturing field of marine crankshafts and 42CrMoA marine internal combustion engine crankshaft forging materials, can solve the problem of not being able to produce a large amount of local deformation, and achieve the effect of low inclusion level

Active Publication Date: 2016-07-06
PANGANG GROUP JIANGYOU CHANGCHENG SPECIAL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (3) Extremely small inclusion wave cracks cannot be produced to meet the local huge amount of deformation during bending and forging

Method used

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  • Manufacturing method of marine crankshaft material and marine crankshaft manufactured by the method

Examples

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Comparison scheme
Effect test

Embodiment 1

[0047] This embodiment is used to illustrate the manufacturing method of the marine crankshaft material of the present invention and the marine crankshaft manufactured by the method.

[0048] (1) Using the smelting process of electric furnace smelting + LF refining + VD vacuum degassing, and then casting at a temperature of 1530 ° C for 20 minutes (casting process of low temperature and slow pouring), based on the total weight of the obtained steel, wherein, The content of C is 0.42% by weight, the content of Mn is 0.72% by weight, the content of Si is 0.25% by weight, the content of P is 0.01% by weight, the content of S is 0.005% by weight, and the content of Cr is 1.19% by weight. The content is 0.21% by weight, the content of Ni is 0.44% by weight, the content of V is 0.08% by weight, the content of Cu is 0.10% by weight, and the content of iron is 96.575% by weight; after tapping, it is cast into 9t octagonal steel ingot;

[0049] (2) The temperature of the 9t octagonal s...

Embodiment 2

[0056] This embodiment is used to illustrate the manufacturing method of the marine crankshaft material of the present invention and the marine crankshaft manufactured by the method.

[0057] (1) Adopt the smelting process of electric furnace smelting + LF refining + VD vacuum degassing, and then cast at 1531°C for 22 minutes (casting process of low temperature and slow pouring), based on the total weight of the obtained steel, wherein, The content of C is 0.42%, the content of Mn is 0.72%, the content of Si is 0.22%, the content of P is 0.012%, the content of S is 0.005%, the content of Cr is 1.12%, the content of Mo is 0.22%, Ni The content of V is 0.43%, the content of V is 0.09%, the content of Cu is 0.10%, and the content of iron is 96.663% by weight; after tapping, it is cast into 9t octagonal steel ingot;

[0058] (2) The temperature of the 9t octagonal steel ingot is sent to the forging workshop to enter the heating furnace at a temperature of 500°C, and the holding ti...

Embodiment 3

[0065] This embodiment is used to illustrate the manufacturing method of the marine crankshaft material of the present invention and the marine crankshaft manufactured by the method.

[0066] (1) Using the smelting process of electric furnace smelting + LF refining + VD vacuum degassing, and then casting at a temperature of 1534 ° C for 19 minutes (casting process of low temperature and slow pouring), based on the total weight of the steel obtained, wherein, The content of C is 0.43% by weight, the content of Mn is 0.74% by weight, the content of Si is 0.27% by weight, the content of P is 0.009% by weight, the content of S is 0.006% by weight, and the content of Cr is 1.15% by weight. The content is 0.21% by weight, the content of Ni is 0.43% by weight, the content of V is 0.1% by weight, the content of Cu is 0.08% by weight, and the content of iron is 96.575% by weight; after tapping, it is cast into 9t octagonal steel ingot;

[0067] (2) The temperature of the 9t octagonal s...

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Abstract

The invention discloses a method for manufacturing a crankshaft material for a ship and a crankshaft for a ship manufactured by the method. The method comprises the following steps: (1) casting the smelted molten steel into steel ingots; (2) forging the steel ingots by adopting a two-upsetting and two-drawing mode; and (3) performing after-treatment on the forged steel in the step (2) by adopting a heat treatment mode of sequentially cooling and performing isothermal annealing. According to the method disclosed by the invention, the crankshaft manufactured by adopting the method meets the requirement of the forged steel 42CrMoA (+Ni+V), and the method can be applied to a crankshaft of an internal combustion engine for the ship.

Description

technical field [0001] The invention belongs to a manufacturing method of iron-based alloy structural steel, in particular, the invention relates to a manufacturing method of a 42CrMoA (+Ni+V) marine internal combustion engine crankshaft forging material, and a marine crankshaft manufactured by the method. Background technique [0002] The heart of the ship is the diesel engine, and the crankshaft is one of the most core components of the diesel engine. The powerful power of the diesel engine needs to be transmitted to the propeller through the crankshaft to drive the screw forward. The marine crankshaft transmits large power and bears alternating loads. It has high requirements on the strength, hardness and impact resistance of the crankshaft steel. At the same time, it has high requirements on the purity, fine grain and structure. [0003] The requirements for crankshaft materials are as follows: [0004] (1) Both high tensile strength and high impact resistance are requi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/46C21D8/00
CPCC21D8/005C22C38/02C22C38/04C22C38/08C22C38/12C22C38/16C22C38/18
Inventor 易文王远明周静谢炜余多贤
Owner PANGANG GROUP JIANGYOU CHANGCHENG SPECIAL STEEL
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