Cast steel material and manufacturing method of casting of cast steel material

Abstract

The invention provides a cast steel material and a manufacturing method of a casting of the cast steel material. The cast steel material comprises the following raw materials in parts by weight: 0.3-0.5 part of C; the content of S is 0.005 to 0.02 percent; 0.2 to 0.4 part of Si; the content of V is 0.003 to 0.005 percent; 1.2 to 1.4 parts of Mn; 0.8 to 1.1 parts of Cr; 0.3 to 0.5 part of Mo; 0.005 to 0.03 percent of P; 0.002 to 0.005 percent of Ni (nickel); the content of the C is 0.4%, the content of the S is 0.01%, and the content of the Si is 0.3%. According to the cast steel material and the manufacturing method of the casting of the cast steel material, by reasonably adjusting the content of elements such as carbon, manganese, chromium and molybdenum, the toughness of the material is remarkably improved while the high strength of the material is kept, brittle fracture can be effectively prevented, and the reliability in subsequent use is improved; the invention has the advantages of simple process, low cost, low sulfur and phosphorus content, reduction of sulfide and phosphide inclusions, improvement of the hot working performance and cold working performance of the material, improvement of the welding performance of the material, and convenience in processing and connection of the cast steel material by reducing the sulfur and phosphorus content.

Description

Technical Field

[0001] The invention relates to the technical field of cast steel materials, and in particular to a cast steel material and a method for manufacturing a casting thereof. Background Art

[0002] With the continuous development of industry, the performance requirements for cast steel materials are getting higher and higher. Traditional cast steel materials are often difficult to meet the needs of complex working conditions in terms of strength, toughness, corrosion resistance, etc. In many fields, such as machinery manufacturing, engineering construction, etc., a cast steel material with strong toughness is needed to ensure the reliability and safety of equipment and structures.

[0003] Although there are many types of cast steel materials on the market, there are still certain limitations in terms of comprehensive performance. Some cast steel materials have high strength but insufficient toughness and are prone to brittle fracture; while other cast steel materials have good toughness but insufficient strength and cannot withstand large loads. In addition, the chemical composition of cast steel materials has a crucial influence on their performance. An unreasonable ratio of chemical components will lead to a decline in material performance.

[0004] Therefore, it is necessary to provide a method for manufacturing a cast steel material and a casting thereof to solve the above technical problems. Summary of the invention

[0005] The invention provides a method for manufacturing a cast steel material and a casting thereof, which solves the problems of high strength but insufficient toughness and easy brittle fracture, good toughness but insufficient strength and difficulty in bearing large loads, and unreasonable proportion leading to performance degradation.

[0006] In order to solve the above technical problems, the present invention provides a cast steel material, which is composed of the following raw materials in parts by weight:

[0007] C: 0.3~0.5;

[0008] S: 0.005~0.02;

[0009] Si: 0.2~0.4;

[0010] V: 0.003~0.005;

[0011] Mn: 1.2~1.4;

[0012] Cr: 0.8~1.1;

[0013] Mo: 0.3~0.5;

[0014] P: 0.005~0.03;

[0015] Ni: 0.002~0.005;

[0016] The balance is Fe.

[0017] Preferably, the C is 0.4, the S is 0.01, the Si is 0.3, the V is 0.004, the Mn is 1.3, the Cr is 1, the Mo is 0.4, the P is 0.01, the Ni is 0.004, and the balance is Fe.

[0018] In order to solve the above problems, the present invention also provides a method for manufacturing a casting of a cast steel material, comprising the following steps:

[0019] S1. Raw material preparation: Accurately weigh the required raw materials according to the chemical composition ratio, including iron, carbon, sulfur, silicon, vanadium, manganese, chromium, molybdenum, phosphorus, and nickel, to ensure that the purity and quality of the raw materials meet the requirements;

[0020] S2. Melting: Add the weighed iron material into the melting furnace, heat it to a certain temperature to melt it; then add other alloying elements, such as manganese, chromium, molybdenum, etc. in turn, stir evenly, and make the alloying elements fully dissolved in the molten iron; control the smelting temperature and time to ensure the uniform distribution of each element and the full chemical reaction during the smelting process; then use a suitable deoxidizer for deoxidation treatment to remove oxygen in the molten iron and improve the quality of the cast steel;

[0021] S3. Casting: Pour the molten steel into the mold, control the pouring temperature and speed, ensure that the steel is fully filled into the mold, and avoid defects such as insufficient pouring and cold shut. During the casting process, vibration and pressurization can be used to further improve the density and quality of the cast steel.

[0022] S4. Heat treatment: Perform proper heat treatment on the steel castings after casting to adjust the organizational structure of the steel castings and improve their strength, toughness and other properties;

[0023] S5. Quality inspection: Carry out quality inspection on manufactured steel castings; ensure that the performance indicators of steel castings meet the design requirements and relevant standards, and promptly handle unqualified products or improve the manufacturing process.

[0024] Preferably, the casting process in step S3 is sand casting and precision casting, and a suitable casting mold and casting method can be selected according to specific product requirements.

[0025] Preferably, the heat treatment in step S4 includes annealing, normalizing, quenching and tempering, and the quality inspection in step S5 includes chemical composition analysis, mechanical property testing and metallographic structure observation.

[0026] Preferably, the normalizing temperature is 880-900°C, the steel is air-cooled after being taken out of the furnace, the tempering temperature is 600-650°C, the quenching temperature is 850-870°C, and the annealing temperature is 750-850°C.

[0027] Preferably, the heat treatment in step S4 requires the use of a quenching device, and the quenching equipment includes a box body, support frames are fixedly installed on both sides of the box body, a hydraulic telescopic rod is fixedly installed inside the support frame, a connecting rod is fixedly installed on the movable end of the hydraulic telescopic rod, a fixing plate is fixedly installed on the bottom of the connecting rod, a fixing rod is fixedly installed on the side of the fixing plate, a placement plate is fixedly installed on the bottom of the fixed rod, the placement plate is slidably connected to the inner side surface of the box body, and a roller is fixedly installed on the top of the fixing rod.

[0028] Preferably, rotating seats are fixedly mounted on both ends of the top of the box body, a cover plate is rotatably connected inside the rotating seat, and a sliding groove is provided inside the cover plate.

[0029] Preferably, the top of the roller abuts against the bottom of the cover plate, and the connecting rod is arranged on the inner side of the sliding groove.

[0030] Preferably, baffles are fixedly installed on the tops of both sides of the box body, and the baffles are arranged on the sides of the cover plate. A water inlet valve is fixedly installed on the top of one side of the box body, and a water outlet valve is fixedly installed on the bottom of one side of the box body.

[0031] Compared with the related art, the present invention provides a method for manufacturing a cast steel material and a casting thereof, which has the following beneficial effects:

[0032] The present invention provides a method for manufacturing a cast steel material and a casting thereof. By reasonably adjusting the contents of elements such as carbon, manganese, chromium, and molybdenum, the toughness of the material is significantly improved while maintaining a relatively high strength, and the occurrence of brittle fracture can be effectively prevented, thereby improving the reliability during subsequent use. In addition, the contents of sulfur and phosphorus are reduced, the inclusions of sulfides and phosphides are reduced, and the hot working properties and cold working properties of the material are improved. At the same time, reducing the contents of sulfur and phosphorus is also beneficial to improving the welding properties of the material, and is convenient for the processing and connection of the cast steel material. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A schematic structural diagram of a quenching device for a method for manufacturing a cast steel material and a casting thereof provided by the present invention;

[0034] Figure 2 for Figure 1 Another perspective structural schematic diagram shown;

[0035] Figure 3 for Figure 2 Another perspective structural schematic diagram shown;

[0036] Figure 4 for Figure 2 An enlarged schematic diagram of part A is shown.

[0037] Numbers in the figure: 1. box body, 11. water inlet valve, 12. water outlet valve, 13. baffle, 2. rotating seat, 21. cover plate, 22. slide, 3. support frame, 31. hydraulic telescopic rod, 32. connecting rod, 33. fixed plate, 34. fixed rod, 35. placement plate, 36. mounting seat, 37. roller. DETAILED DESCRIPTION

[0038] The present invention will be further described below in conjunction with the accompanying drawings and implementation modes.

[0039] A cast steel material, characterized in that it is composed of the following raw materials in parts by weight:

[0040] C: 0.3~0.5;

[0041] S: 0.005~0.02;

[0042] Si: 0.2~0.4;

[0043] V: 0.003~0.005;

[0044] Mn: 1.2~1.4;

[0045] Cr: 0.8~1.1;

[0046] Mo: 0.3~0.5;

[0047] P: 0.005~0.03;

[0048] Ni: 0.002~0.005;

[0049] The balance is Fe.

[0050] The C is 0.4, the S is 0.01, the Si is 0.3, the V is 0.004, the Mn is 1.3, the Cr is 1, the Mo is 0.4, the P is 0.01, the Ni is 0.004, and the balance is Fe.

[0051] Compared with the related art, the present invention provides a method for manufacturing a cast steel material and a casting thereof, which has the following beneficial effects:

[0052] By reasonably adjusting the contents of elements such as carbon, manganese, chromium, and molybdenum, the toughness of the material is significantly improved while maintaining a high strength, which can effectively prevent the occurrence of brittle fracture and improve the reliability in subsequent use; and the sulfur and phosphorus contents are reduced, the sulfide and phosphide inclusions are reduced, and the hot working properties and cold working properties of the material are improved. At the same time, reducing the sulfur and phosphorus contents is also beneficial to improving the welding properties of the material and facilitating the processing and connection of cast steel materials.

[0053] Please see attached Figure 1-4To solve the above problems, the present invention also provides a method for manufacturing a casting of a cast steel material, comprising the following steps:

[0054] S1. Raw material preparation: Accurately weigh the required raw materials according to the chemical composition ratio, including iron, carbon, sulfur, silicon, vanadium, manganese, chromium, molybdenum, phosphorus, and nickel, to ensure that the purity and quality of the raw materials meet the requirements;

[0055] S2. Melting: Add the weighed iron material into the melting furnace, heat it to a certain temperature to melt it; then add other alloying elements, such as manganese, chromium, molybdenum, etc. in turn, stir evenly, and make the alloying elements fully dissolved in the molten iron; control the smelting temperature and time to ensure the uniform distribution of each element and the full chemical reaction during the smelting process; then use a suitable deoxidizer for deoxidation treatment to remove oxygen in the molten iron and improve the quality of the cast steel;

[0056] S3. Casting: Pour the molten steel into the mold, control the pouring temperature and speed, ensure that the steel is fully filled into the mold, and avoid defects such as insufficient pouring and cold shut. During the casting process, vibration and pressurization can be used to further improve the density and quality of the cast steel.

[0057] S4. Heat treatment: Perform proper heat treatment on the steel castings after casting to adjust the organizational structure of the steel castings and improve their strength, toughness and other properties;

[0058] S5. Quality inspection: Carry out quality inspection on manufactured steel castings; ensure that the performance indicators of steel castings meet the design requirements and relevant standards, and promptly handle unqualified products or improve the manufacturing process.

[0059] The casting process in step S3 is sand casting and precision casting, and a suitable casting mold and casting method can be selected according to specific product requirements.

[0060] The heat treatment in step S4 includes annealing, normalizing, quenching and tempering, and the quality inspection in step S5 includes chemical composition analysis, mechanical property testing and metallographic structure observation.

[0061] The normalizing temperature is 880-900°C, and the steel is air-cooled after being taken out of the furnace. The tempering temperature is 600-650°C, the quenching temperature is 850-870°C, and the annealing temperature is 750-850°C.

[0062] The heat treatment in step S4 requires the use of a quenching device, which includes a box body 1, support frames 3 are fixedly installed on both sides of the box body 1, a hydraulic telescopic rod 31 is fixedly installed inside the support frame 3, a connecting rod 32 is fixedly installed on the movable end of the hydraulic telescopic rod 31, a fixing plate 33 is fixedly installed on the bottom of the connecting rod 32, a fixing rod 34 is fixedly installed on the side of the fixing plate 33, a placement plate 35 is fixedly installed on the bottom of the fixing rod 34, the placement plate 35 is slidably connected to the inner side surface of the box body 1, and a roller 37 is fixedly installed on the top of the fixing rod 34.

[0063] A plurality of leak holes are provided on the placement plate 35, so that when in use, the solution can penetrate the steel casting, and the steel slag dropped from the steel casting can be filtered, so that the steel slag is accumulated on the placement plate 35, which is convenient for the user to clean the steel slag and impurities accumulated on the inner side of the box body 1, and convenient for the staff to use;

[0064] The hydraulic telescopic rod 31 can be extended and retracted when in use, thereby driving the placement plate 35 to move up and down on the inner side of the box body 1, so that the staff can place the steel castings;

[0065] The outer side of the placement plate 35 and the inner side of the box body 1 are closely fitted, so that impurities can be prevented from flowing out from the edge of the placement plate 35 to the greatest extent;

[0066] The arrangement of the support frame 3 facilitates the installation of the hydraulic telescopic rod 31 .

[0067] A rotating seat 2 is fixedly mounted on both ends of the top of the box body 1 , and a cover plate 21 is rotatably connected inside the rotating seat 2 . A sliding groove 22 is provided inside the cover plate 21 .

[0068] When in use, the cover plate 21 can rotate on the inner side of the rotating seat 2, and when the cover plate 21 completely covers the top of the box body 1, the smoke generated during quenching can be discharged through the slide groove 22, and when in use, when the cover plate 21 rotates, the connecting rod 32 will slide on the inner side of the slide groove 22.

[0069] The top of the roller 37 abuts against the bottom of the cover plate 21 , and the connecting rod 32 is disposed on the inner side of the sliding groove 22 .

[0070] The roller 37 is made of metal material, and when in use, the roller 37 can rotate at the bottom of the cover 21; the top of the roller 37 abuts against the bottom of the cover 21, so that when in use, the roller 37 can push the cover 21, thereby rotating the cover 21 and covering and opening the top of the box body 1.

[0071] Baffles 13 are fixedly installed on the tops of both sides of the box body 1, and the baffles 13 are arranged on the sides of the cover plate 21. A water inlet valve 11 is fixedly installed on the top of one side of the box body 1, and a water outlet valve 12 is fixedly installed on the bottom of one side of the box body 1.

[0072] When in use, the water outlet valve 12 can be opened to discharge the solution inside the box 1, and then the water inlet valve 11 can be opened to add solution, so that the user can easily replace the quenching solution after use;

[0073] By setting the baffle 13 , when in use, it is possible to prevent the cover plate 21 from rotating at an excessive angle, thereby preventing the cover plate 21 from colliding with the support frame 3 , thereby protecting the support frame 3 .

[0074] When in use, the steel casting to be quenched is placed on the placement plate 35, and then the hydraulic telescopic rod 31 is started to extend the hydraulic telescopic rod 31, so that the placement plate 35 drives the steel casting downward on the inner side of the box body 1 through the driving of the connecting rod 32 and the fixing rod 34, and when the placement plate 35 moves downward, the fixing rod 34 will also drive the roller 37 to move downward. At this time, since the cover plate 21 is pressed on the top of the roller 37, the cover plate 21 will move downward with the roller 37. When the bottom of the cover plate 21 abuts against the top of the box body 1, the steel casting will also be completely immersed in the solution, so that the steel casting is quenched. At this time, the cover plate 21 covers the top of the box body 1, so as to avoid the solution generated during quenching from splashing out, causing injuries to the staff, thereby playing a role in protecting the staff;

[0075] When quenching is completed, the hydraulic telescopic rod 31 contracts, and drives the placement plate 35 to move upward through the connecting rod 32 and the fixed rod 34, so that the top of the roller 37 abuts against the bottom of the cover plate 21, and the cover plate 21 rotates around the rotating seat 2, and at the same time, the fixed rod 34 also drives the placement plate 35 to move upward until the top of the placement plate 35 is flush with the top of the box body 1, thereby driving the quenched steel casting to move out from the inner side of the box body 1, and the user can transfer the quenched steel casting at this time.

[0076] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A cast steel material, characterized in that: It is composed of the following raw materials in parts by weight: C：0.3～0.5； S：0.005～0.02； Si: 0.2~0.4; V：0.003～0.005； Mn: 1.2~1.4; Cr：0.8～1.1； Mo: 0.3~0.5; P：0.005～0.03； Ni: 0.002~0.005; The balance is Fe.

2. The method for manufacturing a cast steel material and a casting thereof according to claim 1, characterized in that: The C is 0.4, the S is 0.01, the Si is 0.3, the V is 0.004, the Mn is 1.3, the Cr is 1, the Mo is 0.4, the P is 0.01, the Ni is 0.004, and the balance is Fe.

3. A method for manufacturing a casting of a cast steel material, characterized in that: The following steps are involved: S1. Raw material preparation: Accurately weigh the required raw materials according to the chemical composition ratio, including iron, carbon, sulfur, silicon, vanadium, manganese, chromium, molybdenum, phosphorus, and nickel, to ensure that the purity and quality of the raw materials meet the requirements; S2. Melting: Add the weighed iron material into the melting furnace, heat it to a certain temperature to melt it; then add other alloying elements, such as manganese, chromium, molybdenum, etc. in turn, stir evenly, and make the alloying elements fully dissolved in the molten iron; control the smelting temperature and time to ensure the uniform distribution of each element and the full chemical reaction during the smelting process; then use a suitable deoxidizer for deoxidation treatment to remove oxygen in the molten iron and improve the quality of the cast steel; S3. Casting: Pour the molten steel into the mold, control the pouring temperature and speed, ensure that the steel is fully filled into the mold, and avoid defects such as insufficient pouring and cold shut. During the casting process, vibration and pressurization can be used to further improve the density and quality of the cast steel. S4. Heat treatment: Perform proper heat treatment on the steel castings after casting to adjust the organizational structure of the steel castings and improve their strength, toughness and other properties; S5. Quality inspection: Carry out quality inspection on manufactured steel castings; ensure that the performance indicators of steel castings meet the design requirements and relevant standards, and promptly handle unqualified products or improve the manufacturing process.

4. The method for manufacturing a casting of a cast steel material according to claim 3, characterized in that: The casting process in step S3 is sand casting and precision casting, and a suitable casting mold and casting method can be selected according to specific product requirements.

5. The method for manufacturing a casting of a cast steel material according to claim 3, characterized in that: The heat treatment in step S4 includes annealing, normalizing, quenching and tempering, and the quality inspection in step S5 includes chemical composition analysis, mechanical property testing and metallographic structure observation.

6. The method for manufacturing a casting of a cast steel material according to claim 5, characterized in that: The normalizing temperature is 880-900°C, and the steel is air-cooled after being taken out of the furnace. The tempering temperature is 600-650°C, the quenching temperature is 850-870°C, and the annealing temperature is 750-850°C.

7. The method for manufacturing a casting of a cast steel material according to claim 3, characterized in that: The heat treatment in step S4 requires the use of a quenching device, and the quenching equipment includes a box body, support frames are fixedly installed on both sides of the box body, a hydraulic telescopic rod is fixedly installed inside the support frame, a connecting rod is fixedly installed on the movable end of the hydraulic telescopic rod, a fixing plate is fixedly installed on the bottom of the connecting rod, a fixing rod is fixedly installed on the side of the fixing plate, a placement plate is fixedly installed on the bottom of the fixing rod, the placement plate is slidably connected to the inner side surface of the box body, and a roller is fixedly installed on the top of the fixing rod.

8. The method for manufacturing a casting of a cast steel material according to claim 7, characterized in that: Both ends of the top of the box body are fixedly mounted with a rotating seat, the interior of the rotating seat is rotatably connected with a cover plate, and the interior of the cover plate is provided with a sliding groove.

9. The method for manufacturing a casting of a cast steel material according to claim 8, characterized in that: The top of the roller abuts against the bottom of the cover plate, and the connecting rod is arranged on the inner side of the sliding groove.

10. The method for manufacturing a casting of a cast steel material according to claim 9, characterized in that: Baffles are fixedly installed on the tops of both sides of the box body, and the baffles are arranged on the sides of the cover plate. A water inlet valve is fixedly installed on the top of one side of the box body, and a water outlet valve is fixedly installed on the bottom of one side of the box body.

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