Round steel for major diameter engineering machine hydraulic oil cylinder piston rod and manufacturing method of round steel

A technology for construction machinery and hydraulic cylinders is applied in the field of large-diameter round steel for the piston rod of construction machinery hydraulic cylinders and its continuous casting, which can solve the problems of low production efficiency and high production cost of round steel, achieve small center segregation, and improve mechanics. The effect of satisfying performance and mechanical properties

Inactive Publication Date: 2018-01-23
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past, in order to meet this requirement, the round steel for piston rods with a diameter of φ90~150mm was often rolled with die-cast slabs. This process resulted in low production efficiency and high production costs for round steel.

Method used

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  • Round steel for major diameter engineering machine hydraulic oil cylinder piston rod and manufacturing method of round steel
  • Round steel for major diameter engineering machine hydraulic oil cylinder piston rod and manufacturing method of round steel
  • Round steel for major diameter engineering machine hydraulic oil cylinder piston rod and manufacturing method of round steel

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Embodiment 1

[0069] The technological process of present embodiment round steel smelting method sees Figure 9 .

[0070] Melt 100 tons of steel with the chemical composition shown below, carry out continuous casting, and make a continuous casting slab with a cross-sectional size of 390mm×510mm. The chemical composition of the obtained continuous casting slab is in the following range in terms of mass percentage: C: 0.35~0.55% , Si: 0.10~0.50%, Mn: 0.80~1.20%, P: ≤0.030%, S: 0.01~0.04%, Cr: ≤0.30%, Ni: ≤0.30%, Cu: ≤0.05%, Mo: ≤0.20 %, Al: 0.01-0.05%, V: 0.05-0.20%, N: 0.005-0.2%, Pb: ≤0.02%, Sn: ≤0.03%, and the balance is Fe and unavoidable impurity elements.

[0071] During the continuous casting process, the pouring superheat degree shall not exceed 35°C, the continuous casting casting speed shall not exceed 0.15 to 0.65m / min, the total reduction under light reduction shall be 1 to 10mm, the specific water content shall not exceed 0.5L / Kg, and the electromagnetic stirring current of the...

Embodiment 2

[0076] The technological process of present embodiment round steel smelting method sees Figure 10 .

[0077] Melt 100 tons of steel with the chemical composition shown below, carry out continuous casting, and make a continuous casting slab with a cross-sectional size of 390mm×510mm. The chemical composition of the obtained continuous casting slab is in the following range in terms of mass percentage: C: 0.35~0.55% , Si: 0.10~0.50%, Mn: 0.80~1.20%, P: ≤0.030%, S: 0.01~0.04%, Cr: ≤0.30%, Ni: ≤0.30%, Cu: ≤0.05%, Mo: ≤0.20 %, Al: 0.01-0.05%, V: 0.05-0.20%, N: 0.005-0.2%, Pb: ≤0.02%, Sn: ≤0.03%, and the balance is Fe and unavoidable impurity elements.

[0078] During the continuous casting process, the pouring superheat degree shall not exceed 35°C, the continuous casting casting speed shall not exceed 0.15 to 0.65m / min, the total reduction under light reduction shall be 1 to 10mm, the specific water content shall not exceed 0.5L / Kg, and the electromagnetic stirring current of the ...

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Abstract

The invention relates to round steel for a major diameter engineering machine hydraulic oil cylinder piston rod. The round steel comprises the following chemical components of, by mass percent, 0.35-0.55% of C, 0.10-0.50% of Si, 0.80-1.20% of M, less than or equal to 0.030% of P, 0.01-0.04% of S, less than or equal to 0.30% of Cr, less than or equal to 0.30% of Ni, less than or equal to 0.05% of Cu, less than or equal to 0.20% of Mo, 0.01-0.05% of Al, 0.03-0.50% of V, 0.005-0.20% of N, less than or equal to 0.02% of Pb, less than or equal to 0.03% of Sn, and the balance Fe and unavoidable impurity elements. All Al and V in the round steel and N form chemical compounds correspondingly, and the chemical compounds are separated out at a grain boundary. The manufactured round steel is little in center segregation, and can meet the friction welding operation requirement, tempering heat treatment is not required in a production flow, and the mechanical properties meet the production and userequirements.

Description

technical field [0001] The invention belongs to the technical field of special steel smelting, and in particular relates to a large-diameter round steel for hydraulic oil cylinder piston rods of engineering machinery and a continuous casting manufacturing method thereof. Background technique [0002] With the development of the national construction machinery industry, engineering hydraulic cylinders, as one of the main actuators of the hydraulic system, have a wider range of applications and greater demand. At the same time, the demand for large-scale hydraulic excavators is also increasing, and during the excavation process, the attitude of the working device is constantly changing, and it is subjected to the combined effects of various loads such as tension and compression, vibration and inertial impact. The quality of hydraulic cylinders puts forward higher requirements. [0003] With the increasing size of excavators, the diameter of the round steel bar for the piston ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/46C22C38/44C22C38/42B22D11/16
Inventor 李冰刘乐东张磊孙艺凡
Owner JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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