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A high-strength vermicular graphite cast iron high-pressure valve body material

A technology of vermicular graphite cast iron and high-pressure valves, which is applied in the field of casting, can solve the problems of narrow range, low creep rate, and failure to meet the performance requirements of high-pressure valve bodies, achieve low production costs, high tensile strength, and solve leakage faults Effect

Inactive Publication Date: 2016-04-13
SHANDONG JIANZHU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional vermicular treatment process range of vermicular graphite cast iron is very narrow, and the vermicular rate is low, which cannot meet the performance requirements of high-pressure valve body

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Furnace charge ratio: Calculate and select Q10 pig iron 60-70%, return charge 15-20%, and Q235 scrap steel 15-20% according to the middle value of C, Si, Mn mass percentage;

[0021] (2) Alloying treatment: calculate the amount of alloying elements added according to the mass percentage of alloying elements: Mo0.4%, Cu0.60%, wherein the element Mo is added with FeMo60 molybdenum, and the element Cu is added with copper;

[0022] (3) Melting: Medium frequency induction furnace is used for smelting, and the feeding sequence is Q10 newborn iron→returned material→scrap steel→60 molybdenum ferro→copper. After smelting, refining, slag removal and sampling, and rapid detection of chemical composition in front of the furnace, the composition is adjusted to the control range After removing the slag, the temperature of the molten iron is about 1520°C;

[0023] (4) Vermicularization treatment: the vermicularization treatment adopts the composite vermicularization agent describ...

Embodiment 2

[0029] (1) Furnace charge ratio: Calculate and select Q10 pig iron 60-70%, return charge 15-20%, and Q235 scrap steel 15-20% according to the middle value of C, Si, Mn mass percentage;

[0030] (2) Alloying treatment: Calculate the addition amount of alloying elements according to the mass percentage of alloying elements: Mo0.55%, Cu0.50%, wherein the element Mo is added as FeMo60 molybdenum iron, and the element Cu is added in the form of pure metal;

[0031] (3) Melting: Medium frequency induction furnace is used for smelting, and the feeding sequence is Q10 newborn iron→returned material→scrap steel→60 molybdenum ferro→red copper 5kg. After smelting, refining, slag removal and sampling, rapid detection of chemical composition before the furnace, the composition is adjusted to control After the range, the slag is removed from the furnace, and the temperature of the molten iron is 1540 °C;

[0032] (4) Vermicularization treatment: the vermicularization treatment adopts the co...

Embodiment 3

[0038] (1) Furnace charge ratio: Calculate and select Q10 pig iron 60-70%, return charge 15-20%, and Q235 scrap steel 15-20% according to the middle value of C, Si, Mn mass percentage;

[0039] (2) Alloying treatment: Calculate the amount of alloying elements added according to the mass percentage of alloying elements: Mo0.70%, Cu0.40%, wherein the element Mo is added as FeMo60 molybdenum iron, and the element Cu is added in the form of pure metal;

[0040] (3) Melting: Medium frequency induction furnace is used for smelting, and the feeding sequence is Q10 newborn iron→returned material→scrap steel→60 molybdenum ferro→5kg of copper. After smelting, refining, slag removal and sampling, rapid detection of chemical composition before the furnace, the composition is adjusted to control After the range, the slag is removed from the furnace, and the temperature of the molten iron is 1560 °C;

[0041] (4) Vermicularization treatment: the vermicularization treatment adopts the compos...

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Abstract

The invention discloses a high-strength vermicular graphite cast iron high-pressure valve body material which comprises the following chemical components in percentage by weight: 3.5-4.0% of C, 1.8-2.7% of Si, 0.4-0.8% of Mn, less than or equal to 0.02% of S, less than or equal to 0.06% of P, 0.4-0.7% of Mo, 0.40-0.60% of Cu, 0.1-0.2% of Ti, 0.08-0.15% of V, 0.013-0.022% of Mg, 0.021-0.045% of Re and the balance of iron. A composite vermicular agent accounting for 0.8-1.5% of the total mass of the iron liquid is adopted for vermicular treatment, and a 75 ferrosilicon inoculant accounting for 0.3-0.6% of the total mass of the iron liquid is adopted for inoculation treatment; the tensile strength of the vermicular graphite cast iron material is greater than or equal to 600MPa, the elongation is greater than or equal to 3.5%, the density is high, the heat conduction and dispersion property and the thermal fatigue resistance are good, and the casting technology is simple; a high-pressure valve body casting produced by use of the high-strength vermicular graphite cast iron material can perfectly meet the using requirements of a high-pressure valve body of a large type excavator while the cost is low.

Description

technical field [0001] The invention relates to the field of casting, in particular to high-pressure valve body castings for excavators. Background technique [0002] As the leader of construction machinery, excavators have excavation mechanical devices similar to human hands, with a large degree of freedom and can complete complex engineering operations. These multi-degree-of-freedom actions are completed by the core component of the excavator - the multi-way control valve. Therefore, a large part of the performance of the excavator depends on the manipulation performance of the multi-way valve. The quality of the multi-way control valve depends on the quality of the valve body. This is because the multi-way control valve for large excavators has to withstand high pressure during use, generally above 35Mpa, so the valve body castings are required to have high strength. , At the same time, the organization is required to be dense to prevent leakage failure under high pressu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C37/10
Inventor 王桂青程贵勤
Owner SHANDONG JIANZHU UNIV
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