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A kind of high and low temperature toughness hydraulic cylinder head and cylinder tail steel and its production process

A hydraulic cylinder, high and low temperature technology, applied in high and low temperature ductile hydraulic cylinder cylinder head and tail steel and its manufacturing field, can solve the problems of high cost of nickel element, poor low temperature toughness, unable to use normally, etc., to achieve full deoxidation capacity, Improves strength and good low temperature impact toughness

Active Publication Date: 2022-03-04
JIANGSU LIHUAI IRON AND STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cylinder head and cylinder tail are very important components in hydraulic cylinders. At present, the material for processing cylinder head and cylinder tail is usually 45 steel. Due to the poor low temperature toughness of 45 steel after quenching and tempering, the use environment of the hydraulic cylinder assembled by it is affected. Very limited, that is, it can only be used in a normal temperature environment, but cannot be used in a low temperature environment
In order to improve the performance under low temperature conditions, it is often necessary to add nickel element to the steel, and the cost of nickel element is relatively high
[0003] Judging from the reported patents, the current patents on hydraulic cylinders are mainly in some design and processing fields, while the patents for steel for the cylinder head and tail of hydraulic cylinders have not been reported. Steel for cylinder head and cylinder tail and its manufacturing method have become a market demand

Method used

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  • A kind of high and low temperature toughness hydraulic cylinder head and cylinder tail steel and its production process
  • A kind of high and low temperature toughness hydraulic cylinder head and cylinder tail steel and its production process
  • A kind of high and low temperature toughness hydraulic cylinder head and cylinder tail steel and its production process

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Experimental program
Comparison scheme
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specific Embodiment approach 2

[0058] The chemical composition is shown in Table 5 and Table 6 below.

[0059] C Si mn V Al N V / N 0.10 0.36 1.75 0.060 0.030 0.0078 7.69

[0060] P S Cr Mo Ti Ni Nb As Cu B 0.009 0.003 0.03 0.0035 0.0025 0.02 0.0045 0.0040 0.03 0.0004

[0061] Prepared by the following production process:

[0062] 1) Hot metal pretreatment: hot metal is desulfurized by KR, the sulfur content of hot metal is 0.030%, the amount of desulfurizer added is 350Kg, the stirring speed is 80r / min, and the stirring time is 7 minutes.

[0063] 2) Converter smelting: smelting in a 90-ton top-bottom double-blowing converter, using 72 tons of molten iron and 20 tons of scrap steel as raw materials for primary smelting, tapping carbon 0.06%, phosphorus 0.008%, sulfur 0.002%, tapping temperature 1630 ℃, the double slag blocking method of sliding plate and slag blocking cone is adopted for tapping to prevent slag dropping, and 372kg of ...

specific Embodiment approach 3

[0075] The chemical composition is shown in Table 9 and Table 10 below.

[0076] C Si mn V Al N V / N 0.08 0.35 1.72 0.058 0.029 0.0080 7.25

[0077] P S Cr Mo Ti Ni Nb As Cu B 0.0010 0.005 0.02 0.0040 0.0022 0.02 0.0040 0.0035 0.04 0.0005

[0078] Prepared by the following production process:

[0079] 1) Hot metal pretreatment: The hot metal is desulfurized by KR, the sulfur content of the hot metal is 0.028%, the amount of desulfurizer added is 340Kg, the stirring speed is 80r / min, and the stirring time is 8 minutes.

[0080] 2) Converter smelting: smelting in a 90-ton top-bottom double-blowing converter, using 70 tons of molten iron and 20 tons of scrap steel as raw materials for primary smelting, tapping carbon 0.05%, phosphorus 0.009%, sulfur 0.003%, tapping temperature 1650 ℃, the double slag blocking method of sliding plate and slag blocking cone is adopted to prevent slag dropping, and 368kg of pr...

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Abstract

The invention discloses a high-low temperature ductile hydraulic cylinder cylinder head and tail steel and its production process. The cylinder head and tail steel is composed of the following elements in mass percentage: C 0.08-0.11%, Si 0.30-0.40%, Si 0.30-0.40%, Mn 1.70~1.80%, Cr≤0.10%, Cu≤0.10%, Ni≤0.10%, Mo≤0.0080%, V 0.050~0.065%, Nb≤0.010%, As≤0.0050%, Al 0.020~0.035%, P≤ 0.013%, S≤0.0050%, B≤0.0008%, Ti≤0.0030%, N0.0055~0.0090%, the balance is Fe and unavoidable impurity elements, of which V / N must be controlled at 5.56~11.82. In the hot-rolled state of the high-low temperature ductile hydraulic cylinder cylinder head and cylinder tail steel produced by the present invention, the V-type impact energy ≥ 190J, the lower yield strength ≥ 320Mpa, the tensile strength ≥ 490Mpa, the elongation ≥ 28%, and the cross-section Shrinkage rate ≥ 48%, non-metallic inclusions (Type A inclusions ≤ 1.0 level, B type inclusions ≤ 1.0 level, C type inclusions ≤ 0.5 level, D type inclusions ≤ 1.0 level), fine austenite grains (austenite grain size ≥ 6.0 grade).

Description

technical field [0001] The invention relates to the field of engineering machinery, in particular to a high-low temperature ductile hydraulic cylinder head and tail steel and a manufacturing method thereof. Background technique [0002] Due to the simple structure and good working stability of the hydraulic cylinder, it can realize reciprocating motion without additional deceleration device and without transmission gap, and directly converts hydraulic energy into mechanical energy with stable movement. It is widely used in construction machinery, petrochemical and other industries. . Cylinder head and cylinder tail are very important components in hydraulic cylinders. At present, the material for processing cylinder head and cylinder tail is usually 45 steel. Due to the poor low temperature toughness of 45 steel after quenching and tempering, the use environment of the hydraulic cylinder assembled by it is affected. There are great limitations, that is, it can only be used ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54C22C38/58C21C7/072C21C7/10C22C33/04
CPCC22C38/02C22C38/42C22C38/58C22C38/46C22C38/44C22C38/48C22C38/54C22C38/50C22C38/001C22C33/04C21C7/072C21C7/10
Inventor 梁佰战刘影赵刚郑力宁肖波石可伟蒋栋初徐守超
Owner JIANGSU LIHUAI IRON AND STEEL CO LTD