CN110938775A - High-strength cast steel and manufacturing method thereof - Google Patents
High-strength cast steel and manufacturing method thereof Download PDFInfo
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- CN110938775A CN110938775A CN201911341076.XA CN201911341076A CN110938775A CN 110938775 A CN110938775 A CN 110938775A CN 201911341076 A CN201911341076 A CN 201911341076A CN 110938775 A CN110938775 A CN 110938775A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/52—Manufacture of steel in electric furnaces
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses high-strength cast steel, which comprises the following chemical element components in percentage by mass: 0.35-0.40% of carbon, 0.35-0.6% of silicon, 1.2-1.4% of manganese, 0.4-0.6% of chromium, less than or equal to 0.035% of phosphorus, less than or equal to 0.035% of sulfur, 0.03-0.08% of aluminum and 0.02-0.06% of titanium, and the cast steel material is added with aluminum, chromium and titanium alloy elements, so that the steel has good strength, toughness and mechanical properties; the production process has the advantages of unique heat treatment process, high production efficiency, energy conservation, environmental protection, good economic benefit, suitability for large-scale production and good popularization value.
Description
Technical Field
The invention relates to alloy steel and a manufacturing method thereof, in particular to a manufacturing method of ultrahigh-strength cast steel.
Background
The metal accessory of the automobile has higher requirements on structural strength and functions, and is also important on machining, so that the requirements not only meet basic conditions of automobile use, but also guarantee safety, reliability and service life prolongation.
In the prior art, the steel for producing the automobile parts is common medium-low content alloy steel, and because the automobile metal parts are generally frequent moving parts in use function, the wear rate is high, the replacement is frequent, and the maintenance cost is increased; it is very important to find a medium-low content alloy steel which can improve the hardness and the wear resistance and has high heat resistance on the surface of the part.
Disclosure of Invention
The present invention is to solve the above problems, and an object of the present invention is to provide a method for producing an ultrahigh-strength cast steel.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: the high-strength cast steel is characterized by comprising the following chemical element components in percentage by mass: 0.35-0.40% of carbon, 0.35-0.6% of silicon, 1.2-1.4% of manganese, 0.4-0.6% of chromium, less than or equal to 0.035% of phosphorus, less than or equal to 0.035% of sulfur, 0.03-0.08% of aluminum and 0.02-0.06% of titanium;
the manufacturing method of the high-strength cast steel comprises the following steps:
(1) putting scrap steel, ferromanganese, aluminum wires, pig iron, ferrochromium and ferrotitanium into a medium-frequency electric furnace for smelting, wherein the smelting temperature is 1600-1650 ℃, and the molten steel reaches 80-90% of the capacity of a hearth;
(2) slag removal of molten steel: removing slag from the molten steel in the step (1), wherein the using amount of a slag removing agent is 0.1-0.3% of the weight of the molten steel in the step (1), the slag removing agent is manually spread on the surface of the molten steel and is uniformly scattered as much as possible, after a tool is used for slightly stirring the surface of the molten steel in the furnace, the slag removing agent rapidly and uniformly expands on the surface of the molten steel, forms a film rapidly, is polymerized and bonded with furnace slag, is gathered into a slag shell which is easily separated from a metal solution, and is picked out by the tool;
(3) deoxidizing molten steel: pure aluminum wires are inserted into the molten steel for deoxidation in the furnace, the using amount is 0.1 percent of the molten steel amount, and the oxygen and the aluminum in the molten steel form Al2O3 and float upwards for discharge;
(4) testing components in front of the furnace: sampling molten steel in the furnace by using a sample cup in front of the furnace, cooling, taking out, manually grinding a spectrum sample by using a grinding wheel machine, carrying out component assay by using a metal material spectrum analyzer, carrying out spectrum excitation analysis on a single sample for three times, and automatically counting by using analysis software to obtain an average value;
(5) component adjustment: adjusting components according to the result of the stokehole test;
(6) tapping and deoxidizing; firstly, baking a casting ladle, when the casting ladle is full of 1/3 casting ladle capacity during tapping, throwing 0.9-1.2 kg/ton of molten steel aluminum wire for final deoxidation of the molten steel, and after the casting ladle is full, uniformly throwing a layer of slag removing agent on the surface of the molten steel to cover the surface.
Further, the slag remover comprises the following components in percentage by weight: 70-75.2% of silicon oxide, 12.1-15.9% of aluminum oxide, 0.5-1.9% of ferric oxide, 1.2-3.22% of sodium oxide, 1.9-3.84% of potassium oxide, 0.9-1.48% of calcium oxide and 0.47-1.46% of magnesium oxide.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention pays attention to the content of residual aluminum in the molten steel of 0.03-0.08%, Al is used as a strong deoxidizer commonly used in the production process of cast steel, after the deoxidizer Al of the molten steel is added, except for deoxidizing and purifying the molten steel, the residual part is combined with N in the molten steel to form AlN, and the compound is helpful for forming crystallization nuclei at the early stage of the solidification of the molten steel and plays a role in refining grains. However, the content of residual aluminum is not so high that excessive residual aluminum forms an excessive AlN compound, precipitates from grain boundaries during solidification of molten steel, affects mechanical properties of steel, and is liable to cause brittle fracture, so that the upper limit of the content of residual aluminum is strictly defined to be 0.08%.
2. The Cr content is 0.4-0.6%, and the Cr content controlled in the percentage can properly enhance the hardenability of the steel and improve the mechanical properties such as the strength, the hardness and the like of the material matrix.
3. The content of Ti added is 0.02-0.06%, the Ti can enhance the deoxidation effect of molten steel in the molten steel smelting stage and the solidification stage, and TiC and TiN are formed in the molten steel solidification stage, so that crystal grains are refined, the Ti can also improve the high-temperature strength of steel, the parts of the engineering machinery produced by the method can generate heat and high temperature due to working conditions such as friction extrusion or long-time walking in certain construction working conditions after the part is installed, and the addition of the Ti can play a role in improving the high-temperature strength of a base material.
Detailed Description
The present invention is further illustrated by the following examples, which include, but are not limited to, the following examples.
A high-strength cast steel comprises the following chemical element components in percentage by mass: 0.35-0.40% of carbon, 0.35-0.6% of silicon, 1.2-1.4% of manganese, 0.4-0.6% of chromium, less than or equal to 0.035% of phosphorus, less than or equal to 0.035% of sulfur, 0.03-0.08% of aluminum and 0.02-0.06% of titanium.
The manufacturing method of the high-strength cast steel comprises the following steps:
(1) putting scrap steel, ferromanganese, aluminum wires, pig iron, ferrochromium and ferrotitanium into a medium-frequency electric furnace for smelting, wherein the smelting temperature is 1600-1650 ℃, and the molten steel reaches 80-90% of the capacity of a hearth;
(2) slag removal of molten steel: removing slag from the molten steel in the step (1), wherein the using amount of a slag removing agent is 0.1-0.3% of the weight of the molten steel in the step (1), the slag removing agent is manually spread on the surface of the molten steel and is uniformly scattered as much as possible, after a tool is used for slightly stirring the surface of the molten steel in the furnace, the slag removing agent rapidly and uniformly expands on the surface of the molten steel, forms a film rapidly, is polymerized and bonded with slag, is gathered into a slag shell which is easily separated from a metal solution, and is picked out by the tool, so that the aim of removing slag from the molten steel is fulfilled;
(3) deoxidizing molten steel: pure aluminum wires are inserted into the molten steel for deoxidation in the furnace, the using amount is 0.1 percent of the molten steel amount, and oxygen in the molten steel and aluminum form Al2O3 and float upwards for discharge, because Al2O3 and the molten steel have poor wettability and large interphase tension (2N/m), the deoxidation compound product is polymerized and grows due to collision because of the rolling and stirring of the molten steel, and meanwhile, the rolling of the molten steel and the violent movement of the molten slag also promote the deoxidation compound product to be captured by the molten slag or adhered to the surface of a ladle lining, thereby achieving the purpose of deoxidation of the molten steel;
(4) testing components in front of the furnace: sampling molten steel in the furnace by using a sample cup in front of the furnace, taking out after cooling, manually grinding a spectrum sample by using a grinding wheel machine, carrying out component assay by using a metal material spectrum analyzer, carrying out spectrum excitation analysis on a single sample for three times, and automatically counting and averaging by using analysis software, wherein the average value is a test result in front of the furnace and is used as a basis for subsequent component adjustment;
(5) component adjustment: and adjusting the components according to the result of the stokehole test. The component calculation method comprises the following steps: for example, when the Mn content is 0.8% and the standard content is 1.2 to 1.4% by a stokehole assay, and the target value is 1.3% of the mean value, the manganese content of the molten steel needs to be increased by 1.3% to 0.8% =0.5%, and if the Mn content of ferromanganese is known to be 60%, the weight of the added ferromanganese needs to be increased by 1 ton of molten steel: 1000x0.5%/60% =8.33Kg, other components are calculated by the same method;
(6) tapping and deoxidizing; firstly, baking a casting ladle, when the casting ladle is full of 1/3 casting ladle capacity during tapping, throwing 0.9-1.2 kg/ton of molten steel aluminum wire for final deoxidation of the molten steel, and after the casting ladle is full, uniformly throwing a layer of slag removing agent on the surface of the molten steel to cover the surface so as to continuously remove slag and isolate the contact of the molten steel in the furnace and air to prevent reoxidation;
(7) and pouring a cavity casting product. During pouring, a proper tool is used for blocking slag at a pouring ladle opening, so that molten slag and floating slag on the surface of molten steel are prevented from flowing into a casting cavity.
The slag remover comprises the following components in percentage by weight: 70-75.2% of silicon oxide, 12.1-15.9% of aluminum oxide, 0.5-1.9% of ferric oxide, 1.2-3.22% of sodium oxide, 1.9-3.84% of potassium oxide, 0.9-1.48% of calcium oxide and 0.47-1.46% of magnesium oxide.
And (3) according to the standard of JB/T5000.06-2007 Steel casting general technical conditions for heavy machinery, manufacturing a mechanical tensile test bar, and performing a material tensile strength test.
All data of mechanical property test are higher than those of other similar materials in the same industry
I have all promoted by a wide margin with indexes such as drive wheel, leading wheel of the material production of above element ratio, mechanical properties, wearability, possess the life that is higher than other products of the same expert.
The above-mentioned embodiments are only preferred embodiments of the present invention, and should not be used to limit the scope of the present invention, but all the modifications or variations that are not essential to the spirit and the concept of the main body of the present invention can be made, and the technical problems to be solved by the embodiments are still consistent with the present invention, and should be included in the scope of the present invention.
Claims (2)
1. The high-strength cast steel is characterized by comprising the following chemical element components in percentage by mass: 0.35-0.40% of carbon, 0.35-0.6% of silicon, 1.2-1.4% of manganese, 0.4-0.6% of chromium, less than or equal to 0.035% of phosphorus, less than or equal to 0.035% of sulfur, 0.03-0.08% of aluminum and 0.02-0.06% of titanium;
the manufacturing method of the high-strength cast steel comprises the following steps:
(1) putting scrap steel, ferromanganese, aluminum wires, pig iron, ferrochromium and ferrotitanium into a medium-frequency electric furnace for smelting, wherein the smelting temperature is 1600-1650 ℃, and the molten steel reaches 80-90% of the capacity of a hearth;
(2) slag removal of molten steel: removing slag from the molten steel in the step (1), wherein the using amount of a slag removing agent is 0.1-0.3% of the weight of the molten steel in the step (1), the slag removing agent is manually spread on the surface of the molten steel and is uniformly scattered as much as possible, after a tool is used for slightly stirring the surface of the molten steel in the furnace, the slag removing agent rapidly and uniformly expands on the surface of the molten steel, forms a film rapidly, is polymerized and bonded with furnace slag, is gathered into a slag shell which is easily separated from a metal solution, and is picked out by the tool;
(3) deoxidizing molten steel: pure aluminum wires are inserted into the molten steel for deoxidation in the furnace, the using amount is 0.1 percent of the molten steel amount, and the oxygen and the aluminum in the molten steel form Al2O3 and float upwards for discharge;
(4) testing components in front of the furnace: sampling molten steel in the furnace by using a sample cup in front of the furnace, cooling, taking out, manually grinding a spectrum sample by using a grinding wheel machine, carrying out component assay by using a metal material spectrum analyzer, carrying out spectrum excitation analysis on a single sample for three times, and automatically counting by using analysis software to obtain an average value;
(5) component adjustment: adjusting components according to the result of the stokehole test;
(6) tapping and deoxidizing; firstly, baking a casting ladle, when the casting ladle is full of 1/3 casting ladle capacity during tapping, throwing 0.9-1.2 kg/ton of molten steel aluminum wire for final deoxidation of the molten steel, and uniformly throwing a layer of slag removing agent on the surface of the molten steel to cover the surface after the steel ladle is full;
(7) and pouring a cavity casting product.
2. The high-strength cast steel according to claim 1, characterized in that: the slag remover comprises the following components in percentage by weight: 70-75.2% of silicon oxide, 12.1-15.9% of aluminum oxide, 0.5-1.9% of ferric oxide, 1.2-3.22% of sodium oxide, 1.9-3.84% of potassium oxide, 0.9-1.48% of calcium oxide and 0.47-1.46% of magnesium oxide.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110983157A (en) * | 2019-12-09 | 2020-04-10 | 湖北三江航天万山特种车辆有限公司 | Smelting method for improving mechanical property of ZG40Mn2 |
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Cited By (1)
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| CN110983157A (en) * | 2019-12-09 | 2020-04-10 | 湖北三江航天万山特种车辆有限公司 | Smelting method for improving mechanical property of ZG40Mn2 |
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