CN112662937A - High-tensile-strength nodular cast iron and valve preparation method thereof - Google Patents
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Abstract
The invention provides high-tensile-strength nodular cast iron which comprises the following raw materials in parts by weight: 100 parts of pig iron, 20-50 parts of waste machine parts, 3-4 parts of carbon, 1.5-2.2 parts of silicon, 0.2-0.4 part of manganese, 0.01-0.03 part of phosphorus, 0.005-0.02 part of sulfur, 0.5-1 part of composite metal, 0.5-1 part of copper, 1-1.5 parts of nodulizer and 1.2-1.7 parts of inoculant, wherein the composite metal comprises one or more of zirconium, chromium, tin, molybdenum, nickel and titanium; the casting method of the valve, which applies the nodular cast iron, comprises the following steps: (1) smelting waste parts; (2) smelting raw materials; (3) spheroidizing and inoculating; (4) casting and forming; (5) heat treatment; (6) machining; the invention has the beneficial effects that: the tensile strength and the elongation are improved by changing the content of the composite alloy in the nodular cast iron material and the weight part combination of the raw materials, so that the requirement of manufacturing the valve used in a high-pressure environment is met.
Description
Technical Field
The invention relates to the technical field of valve casting, in particular to high-tensile-strength nodular cast iron and a valve preparation method thereof.
Background
The valve is a pipeline accessory used for opening and closing a pipeline, controlling the flow direction, and adjusting and controlling parameters (temperature, pressure and flow) of a conveying medium; according to its function, it can be divided into shut-off valve, check valve, regulating valve, etc.; the valve is a control part in a fluid conveying system and has the functions of stopping, adjusting, guiding, preventing counter flow, stabilizing pressure, shunting or overflowing and relieving pressure and the like.
The nodular cast iron is spheroidal graphite obtained through spheroidization and inoculation, and the mechanical property, particularly the plasticity and the toughness of the cast iron are effectively improved, so that the mechanical strength which is more excellent than that of carbon steel is obtained; the nodular cast iron is a high-strength cast iron material developed in the 50 th century, and the comprehensive performance of the nodular cast iron material is close to that of steel, so that the nodular cast iron material is successfully used for casting castings with complex stress and high requirements on strength, toughness and wear resistance.
The valve is used as an important part in pipeline transportation, the performance requirement is high, particularly in high-pressure transportation, the tensile strength of the valve is high, and the situation that the valve cracks and leaks is avoided.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the nodular cast iron with high tensile strength.
The invention solves the technical problems through the following technical means:
the high-tensile-strength nodular cast iron comprises the following raw materials in parts by weight: 100 parts of pig iron, 20-50 parts of waste machine parts, 3-4 parts of carbon, 1.5-2.2 parts of silicon, 0.2-0.4 part of manganese, 0.01-0.03 part of phosphorus, 0.005-0.02 part of sulfur, 0.5-1 part of composite metal, 0.5-1 part of copper, 1-1.5 parts of nodulizer and 1.2-1.7 parts of inoculant, wherein the composite metal comprises one or more of zirconium, chromium, tin, molybdenum, nickel and titanium.
As an improvement of the technical scheme, 100 parts of pig iron, 35 parts of waste parts, 3.2 parts of carbon, 2 parts of silicon, 0.4 part of manganese, 0.02 part of phosphorus, 0.01 part of sulfur, 0.8 part of composite metal, 0.9 part of copper, 1.2 parts of nodulizer and 1.5 parts of inoculant.
As an improvement of the technical scheme, the composite metal is prepared by mixing the amounts of chromium, molybdenum, nickel and the like.
As an improvement of the technical scheme, the waste machine part is any one or more of a pouring gate, a casting head and a casting which is scrapped due to casting defects generated in valve casting.
As an improvement of the technical scheme, the pig iron is Q10 pig iron, and the Q10 pig iron is nodular pig iron with the phosphorus content of less than 0.05 percent, the sulfur content of less than 0.03 percent, the carbon content of 3.4 to 4 percent, the silicon content of 0.5 to 0.7 percent and the titanium content of less than or equal to 0.05 percent.
As an improvement of the technical scheme, the nodulizer is a rare earth magnesium alloy with the brand number of 3-8 or 5-8.
The casting method of the valve, which applies the nodular cast iron, comprises the following steps:
(1) smelting waste parts: firstly, adding the waste machine parts into an electric furnace, and heating to 1450 +/-20 ℃;
(2) smelting raw materials: then adding the weighed composite metal, manganese, silicon, carbon, phosphorus and sulfur into an electric furnace in sequence, heating to the temperature of not less than 1500 +/-20 ℃, and standing for slagging-off treatment;
(3) spheroidizing and inoculating treatment: adding a nodulizer to the bottom of the ladle, covering an inoculant on the upper part of the ladle, pressurizing iron to cover and compact the ladle, and continuously heating the molten iron to 1550 +/-20 ℃;
(4) casting and forming: and (4) transporting the molten iron to a casting site for casting to obtain the valve casting.
(5) And (3) heat treatment: heating the casting to 900 +/-20 ℃, preserving heat for 3-5h, cooling to 680 +/-20 ℃ at the speed of 6 +/-2 ℃/min, preserving heat for 2-4h, and air cooling to room temperature; heating the air-cooled casting to 900 +/-20 ℃, cooling to 400-450 ℃ at the speed of 12 +/-20 ℃/min, air-cooling to room temperature, and then performing stress relief annealing to obtain a valve casting;
(6) and (3) machining: and (5) polishing and machining the valve prepared in the step (5) to finally obtain a finished valve product.
The invention has the beneficial effects that: the tensile strength and the elongation are improved by changing the content of the composite alloy in the nodular cast iron material and the weight part combination of the raw materials, so that the requirement of manufacturing a valve used in a high-pressure environment is met;
by improving the formula of the nodular cast iron, the performance of the casting directly obtained in an as-cast state form is greatly improved, and the casting belongs to high-performance nodular cast iron; the composite alloy-zirconium, chromium, tin, molybdenum, nickel and titanium are added into the casting, so that the atomic activity of C and N elements is improved, air groups formed by atoms can form strong interaction with dislocations, the dislocations are pinned, a yield platform is generated, the hardenability of steel is improved, the strength, the hardness and the wear resistance are obviously improved, and the corrosion resistance is improved; proper copper is added into the casting, so that pearlite is refined, white spots on a thin section are reduced, and the tissue sensitivity of a large section is improved; the strength, hardness and toughness of the product are improved in mechanical property; the wear resistance, heat resistance and corrosion resistance of the product are improved in the service performance, and meanwhile, the density of the product is improved.
Drawings
FIG. 1 is a schematic flow chart illustrating a method of casting a valve according to an embodiment of the present invention;
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Example 1
The high tensile strength nodular cast iron comprises the following raw materials in parts by weight: 100 parts of pig iron, 50 parts of waste machine parts, 3 parts of carbon, 1.6 parts of silicon, 0.25 part of manganese, 0.01 part of phosphorus, 0.005 part of sulfur, 1 part of composite metal, 0.6 part of copper, 1 part of nodulizer and 1.2 parts of inoculant, wherein the composite metal comprises one or more of zirconium, chromium, tin, molybdenum, nickel and titanium.
The composite metal is prepared by mixing the amount of chromium, molybdenum, nickel and the like.
The waste machine parts are any one or more of pouring gates, casting heads and castings scrapped due to casting defects generated in valve casting.
The pig iron is Q10 pig iron, and the Q10 pig iron is nodular pig iron with the phosphorus content of less than 0.05 percent, the sulfur content of less than 0.03 percent, the carbon content of 3.4 to 4 percent, the silicon content of 0.5 to 0.7 percent and the titanium content of less than or equal to 0.05 percent.
The nodulizer is a rare earth magnesium alloy with the brand number of 3-8 or 5-8.
The casting method of the valve, which applies the nodular cast iron, comprises the following steps:
(1) smelting waste parts: firstly, adding the waste machine parts into an electric furnace, and heating to 1450 +/-20 ℃;
(2) smelting raw materials: then adding the weighed composite metal, manganese, silicon, carbon, phosphorus and sulfur into an electric furnace in sequence, heating to the temperature of not less than 1500 +/-20 ℃, and standing for slagging-off treatment;
(3) spheroidizing and inoculating treatment: adding a nodulizer to the bottom of the ladle, covering an inoculant on the upper part of the ladle, pressurizing iron to cover and compact the ladle, and continuously heating the molten iron to 1550 +/-20 ℃;
(4) casting and forming: and (4) transporting the molten iron to a casting site for casting to obtain the valve casting.
(5) And (3) heat treatment: heating the casting to 900 +/-20 ℃, preserving heat for 3h, cooling to 680 +/-20 ℃ at the speed of 6 +/-2 ℃/min, preserving heat for 2h, and cooling in air to room temperature; heating the air-cooled casting to 900 +/-20 ℃, cooling to 400-450 ℃ at the speed of 12 +/-20 ℃/min, air-cooling to room temperature, and then performing stress relief annealing to obtain a valve casting;
(6) and (3) machining: and (5) polishing and machining the valve prepared in the step (5) to finally obtain a finished valve product.
Example 2
The high tensile strength nodular cast iron comprises the following raw materials in parts by weight: 100 parts of pig iron, 40 parts of waste machine parts, 3.4 parts of carbon, 1.8 parts of silicon, 0.3 part of manganese, 0.015 part of phosphorus, 0.008 part of sulfur, 0.6 part of composite metal, 0.8 part of copper, 1.1 part of nodulizer and 1.4 parts of inoculant, wherein the composite metal comprises one or more of zirconium, chromium, tin, molybdenum, nickel and titanium.
The composite metal is prepared by mixing the amount of chromium, molybdenum, nickel and the like.
The waste machine parts are any one or more of pouring gates, casting heads and castings scrapped due to casting defects generated in valve casting.
The pig iron is Q10 pig iron, and the Q10 pig iron is nodular pig iron with the phosphorus content of less than 0.05 percent, the sulfur content of less than 0.03 percent, the carbon content of 3.4 to 4 percent, the silicon content of 0.5 to 0.7 percent and the titanium content of less than or equal to 0.05 percent.
The nodulizer is a rare earth magnesium alloy with the brand number of 3-8 or 5-8.
The casting method of the valve, which applies the nodular cast iron, comprises the following steps:
(1) smelting waste parts: firstly, adding the waste machine parts into an electric furnace, and heating to 1450 +/-20 ℃;
(2) smelting raw materials: then adding the weighed composite metal, manganese, silicon, carbon, phosphorus and sulfur into an electric furnace in sequence, heating to the temperature of not less than 1500 +/-20 ℃, and standing for slagging-off treatment;
(3) spheroidizing and inoculating treatment: adding a nodulizer to the bottom of the ladle, covering an inoculant on the upper part of the ladle, pressurizing iron to cover and compact the ladle, and continuously heating the molten iron to 1550 +/-20 ℃;
(4) casting and forming: and (4) transporting the molten iron to a casting site for casting to obtain the valve casting.
(5) And (3) heat treatment: heating the casting to 900 +/-20 ℃, preserving heat for 3.5h, cooling to 680 +/-20 ℃ at the speed of 6 +/-2 ℃/min, preserving heat for 2.5h, and air-cooling to room temperature; heating the air-cooled casting to 900 +/-20 ℃, cooling to 400-450 ℃ at the speed of 12 +/-20 ℃/min, air-cooling to room temperature, and then performing stress relief annealing to obtain a valve casting;
(6) and (3) machining: and (5) polishing and machining the valve prepared in the step (5) to finally obtain a finished valve product.
Example 3
The high tensile strength nodular cast iron comprises the following raw materials in parts by weight: 100 parts of pig iron, 35 parts of waste machine parts, 3.2 parts of carbon, 2 parts of silicon, 0.4 part of manganese, 0.02 part of phosphorus, 0.01 part of sulfur, 0.8 part of composite metal, 0.9 part of copper, 1.2 parts of nodulizer and 1.5 parts of inoculant, wherein the composite metal comprises one or more of zirconium, chromium, tin, molybdenum, nickel and titanium.
The composite metal is prepared by mixing the amount of chromium, molybdenum, nickel and the like.
The waste machine parts are any one or more of pouring gates, casting heads and castings scrapped due to casting defects generated in valve casting.
The pig iron is Q10 pig iron, and the Q10 pig iron is nodular pig iron with the phosphorus content of less than 0.05 percent, the sulfur content of less than 0.03 percent, the carbon content of 3.4 to 4 percent, the silicon content of 0.5 to 0.7 percent and the titanium content of less than or equal to 0.05 percent.
The nodulizer is a rare earth magnesium alloy with the brand number of 3-8 or 5-8.
The casting method of the valve, which applies the nodular cast iron, comprises the following steps:
(1) smelting waste parts: firstly, adding the waste machine parts into an electric furnace, and heating to 1450 +/-20 ℃;
(2) smelting raw materials: then adding the weighed composite metal, manganese, silicon, carbon, phosphorus and sulfur into an electric furnace in sequence, heating to the temperature of not less than 1500 +/-20 ℃, and standing for slagging-off treatment;
(3) spheroidizing and inoculating treatment: adding a nodulizer to the bottom of the ladle, covering an inoculant on the upper part of the ladle, pressurizing iron to cover and compact the ladle, and continuously heating the molten iron to 1550 +/-20 ℃;
(4) casting and forming: and (4) transporting the molten iron to a casting site for casting to obtain the valve casting.
(5) And (3) heat treatment: heating the casting to 900 +/-20 ℃, preserving heat for 4h, cooling to 680 +/-20 ℃ at the speed of 6 +/-2 ℃/min, preserving heat for 3h, and cooling in air to room temperature; heating the air-cooled casting to 900 +/-20 ℃, cooling to 400-450 ℃ at the speed of 12 +/-20 ℃/min, air-cooling to room temperature, and then performing stress relief annealing to obtain a valve casting;
(6) and (3) machining: and (5) polishing and machining the valve prepared in the step (5) to finally obtain a finished valve product.
Example 4
The high tensile strength nodular cast iron comprises the following raw materials in parts by weight: 100 parts of pig iron, 28 parts of waste machine parts, 3.8 parts of carbon, 1.9 parts of silicon, 0.35 part of manganese, 0.27 part of phosphorus, 0.018 part of sulfur, 0.5 part of composite metal, 0.6 part of copper, 1.35 parts of nodulizer and 1.6 parts of inoculant, wherein the composite metal comprises one or more of zirconium, chromium, tin, molybdenum, nickel and titanium.
The composite metal is prepared by mixing the amount of chromium, molybdenum, nickel and the like.
The waste machine parts are any one or more of pouring gates, casting heads and castings scrapped due to casting defects generated in valve casting.
The pig iron is Q10 pig iron, and the Q10 pig iron is nodular pig iron with the phosphorus content of less than 0.05 percent, the sulfur content of less than 0.03 percent, the carbon content of 3.4 to 4 percent, the silicon content of 0.5 to 0.7 percent and the titanium content of less than or equal to 0.05 percent.
The nodulizer is a rare earth magnesium alloy with the brand number of 3-8 or 5-8.
The casting method of the valve, which applies the nodular cast iron, comprises the following steps:
(1) smelting waste parts: firstly, adding the waste machine parts into an electric furnace, and heating to 1450 +/-20 ℃;
(2) smelting raw materials: then adding the weighed composite metal, manganese, silicon, carbon, phosphorus and sulfur into an electric furnace in sequence, heating to the temperature of not less than 1500 +/-20 ℃, and standing for slagging-off treatment;
(3) spheroidizing and inoculating treatment: adding a nodulizer to the bottom of the ladle, covering an inoculant on the upper part of the ladle, pressurizing iron to cover and compact the ladle, and continuously heating the molten iron to 1550 +/-20 ℃;
(4) casting and forming: and (4) transporting the molten iron to a casting site for casting to obtain the valve casting.
(5) And (3) heat treatment: heating the casting to 900 +/-20 ℃, preserving heat for 4.5h, cooling to 680 +/-20 ℃ at the speed of 6 +/-2 ℃/min, preserving heat for 3.5h, and air-cooling to room temperature; heating the air-cooled casting to 900 +/-20 ℃, cooling to 400-450 ℃ at the speed of 12 +/-20 ℃/min, air-cooling to room temperature, and then performing stress relief annealing to obtain a valve casting;
(6) and (3) machining: and (5) polishing and machining the valve prepared in the step (5) to finally obtain a finished valve product.
Example 5
The high tensile strength nodular cast iron comprises the following raw materials in parts by weight: 100 parts of pig iron, 20 parts of waste machine parts, 4 parts of carbon, 2.2 parts of silicon, 0.4 part of manganese, 0.03 part of phosphorus, 0.02 part of sulfur, 0.9 part of composite metal, 1 part of copper, 1.5 parts of nodulizer and 1.7 parts of inoculant, wherein the composite metal comprises one or more of zirconium, chromium, tin, molybdenum, nickel and titanium.
The composite metal is prepared by mixing the amount of chromium, molybdenum, nickel and the like.
The waste machine parts are any one or more of pouring gates, casting heads and castings scrapped due to casting defects generated in valve casting.
The pig iron is Q10 pig iron, and the Q10 pig iron is nodular pig iron with the phosphorus content of less than 0.05 percent, the sulfur content of less than 0.03 percent, the carbon content of 3.4 to 4 percent, the silicon content of 0.5 to 0.7 percent and the titanium content of less than or equal to 0.05 percent.
The nodulizer is a rare earth magnesium alloy with the brand number of 3-8 or 5-8.
The casting method of the valve, which applies the nodular cast iron, comprises the following steps:
(1) smelting waste parts: firstly, adding the waste machine parts into an electric furnace, and heating to 1450 +/-20 ℃;
(2) smelting raw materials: then adding the weighed composite metal, manganese, silicon, carbon, phosphorus and sulfur into an electric furnace in sequence, heating to the temperature of not less than 1500 +/-20 ℃, and standing for slagging-off treatment;
(3) spheroidizing and inoculating treatment: adding a nodulizer to the bottom of the ladle, covering an inoculant on the upper part of the ladle, pressurizing iron to cover and compact the ladle, and continuously heating the molten iron to 1550 +/-20 ℃;
(4) casting and forming: and (4) transporting the molten iron to a casting site for casting to obtain the valve casting.
(5) And (3) heat treatment: heating the casting to 900 +/-20 ℃, preserving heat for 5h, cooling to 680 +/-20 ℃ at the speed of 6 +/-2 ℃/min, preserving heat for 4h, and cooling in air to room temperature; heating the air-cooled casting to 900 +/-20 ℃, cooling to 400-450 ℃ at the speed of 12 +/-20 ℃/min, air-cooling to room temperature, and then performing stress relief annealing to obtain a valve casting;
(6) and (3) machining: and (5) polishing and machining the valve prepared in the step (5) to finally obtain a finished valve product.
The elongation of the nodular cast iron in examples 1 to 5 was 18% or more and the tensile strength was 450Mpa or more, and the elongation of the nodular cast iron in example 3 was 22% and the tensile strength was 520Mpa, which is the most preferable embodiment of the present invention.
It is noted that, in this document, relational terms such as first and second, and the like, if any, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. The utility model provides a high tensile strength nodular cast iron which characterized in that: the composite material comprises the following raw materials in parts by weight: 100 parts of pig iron, 20-50 parts of waste machine parts, 3-4 parts of carbon, 1.5-2.2 parts of silicon, 0.2-0.4 part of manganese, 0.01-0.03 part of phosphorus, 0.005-0.02 part of sulfur, 0.5-1 part of composite metal, 0.5-1 part of copper, 1-1.5 parts of nodulizer and 1.2-1.7 parts of inoculant, wherein the composite metal comprises one or more of zirconium, chromium, tin, molybdenum, nickel and titanium.
2. The high tensile strength ductile iron according to claim 1, wherein: 100 parts of pig iron, 35 parts of waste machine parts, 3.2 parts of carbon, 2 parts of silicon, 0.4 part of manganese, 0.02 part of phosphorus, 0.01 part of sulfur, 0.8 part of composite metal, 0.9 part of copper, 1.2 parts of nodulizer and 1.5 parts of inoculant.
3. The high tensile strength ductile iron according to claim 1, wherein: the composite metal is prepared by mixing the amount of chromium, molybdenum, nickel and the like.
4. The high tensile strength ductile iron according to claim 1, wherein: the waste machine parts are any one or more of pouring gates, casting heads and castings scrapped due to casting defects generated in valve casting.
5. The high tensile strength ductile iron according to claim 1, wherein: the pig iron is Q10 pig iron, and the Q10 pig iron is nodular pig iron with the phosphorus content of less than 0.05 percent, the sulfur content of less than 0.03 percent, the carbon content of 3.4 to 4 percent, the silicon content of 0.5 to 0.7 percent and the titanium content of less than or equal to 0.05 percent.
6. The high tensile strength ductile iron according to claim 1, wherein: the nodulizer is a rare earth magnesium alloy with the brand number of 3-8 or 5-8.
7. A method of casting a valve, comprising: the application of the nodular cast iron comprises the following steps:
(1) smelting waste parts: firstly, adding the waste machine parts into an electric furnace, and heating to 1450 +/-20 ℃;
(2) smelting raw materials: then adding the weighed composite metal, manganese, silicon, carbon, phosphorus and sulfur into an electric furnace in sequence, heating to the temperature of not less than 1500 +/-20 ℃, and standing for slagging-off treatment;
(3) spheroidizing and inoculating treatment: adding a nodulizer to the bottom of the ladle, covering an inoculant on the upper part of the ladle, pressurizing iron to cover and compact the ladle, and continuously heating the molten iron to 1550 +/-20 ℃;
(4) casting and forming: transporting molten iron to a casting site for casting to obtain a valve casting;
(5) and (3) heat treatment: heating the casting to 900 +/-20 ℃, preserving heat for 3-5h, cooling to 680 +/-20 ℃ at the speed of 6 +/-2 ℃/min, preserving heat for 2-4h, and air cooling to room temperature; heating the air-cooled casting to 900 +/-20 ℃, cooling to 400-450 ℃ at the speed of 12 +/-20 ℃/min, air-cooling to room temperature, and then performing stress relief annealing to obtain a valve casting;
(6) and (3) machining: and (5) polishing and machining the valve prepared in the step (5) to finally obtain a finished valve product.
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| CN113664154A (en) * | 2021-08-19 | 2021-11-19 | 瑞安市陶山铸造厂 | Casting process for pump valve casting |
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| CN107245642A (en) * | 2017-06-29 | 2017-10-13 | 临清市金光机械制造有限公司 | A kind of equalizing suspension system casting with spheroidal graphite cast-iron plastics on new materials with and preparation method thereof |
| CN109609836A (en) * | 2018-12-28 | 2019-04-12 | 格朗富（苏州）集团有限公司 | The production method and its cast product of as cast condition heavy section ductile iron |
| CN111074034A (en) * | 2019-12-27 | 2020-04-28 | 上海烟草机械有限责任公司 | Preparation method of as-cast mixed matrix QT600-10 nodular cast iron |
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| CN113664154A (en) * | 2021-08-19 | 2021-11-19 | 瑞安市陶山铸造厂 | Casting process for pump valve casting |
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