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Electroslag remelting method for smelting high-cleanliness hot work die steel

A technology of hot work die steel and electroslag remelting, which is applied in the field of iron and steel smelting, can solve the problems that it is difficult to effectively reduce the oxygen and sulfur content of molten steel, the change of slag composition, and reduce the stability, so as to promote transformation and increase alkalinity , Improve the effect of cleanliness

Pending Publication Date: 2022-06-28
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of electroslag remelting, "notoginseng slag" is generally used, that is, Al with a mass fraction of 30%. 2 o 3 and 70% CaF 2 The disadvantage is that it is difficult to effectively reduce the content of oxygen and sulfur in molten steel and remove inclusions. At the same time, due to the high content of calcium fluoride in slag, it is easy to volatilize in smelting production and pollute the atmosphere. At the same time, it changes the composition of slag and reduces its stability. sex

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Electroslag remelting is used to smelt high-end hot work die steel electrode rods. The chemical composition of the base metal of hot work die steel electrode rods for electroslag remelting is: C: 0.39%, Si: 0.97%, Mn: 0.48 %, P: 0.015%, S: 0.008%, Cr: 5.00%, Mo: 1.45%, V: 1.02%, balance Fe and impurities. Before smelting, the electrode rod is subjected to tumbling treatment to remove the iron oxide scale on the surface of the electrode rod, and the surface of the electrode rod is smooth and free of rust.

[0033] Before mixing the slag, the various raw materials of the slag were baked at a temperature of 760 degrees Celsius for 7.5 hours to completely remove the moisture in the slag. The quality of the slag is 9.6% of the mass of the electroslag remelting electrode rod, and the composition of the electroslag remelting slag system is calculated as a percentage by mass: CaF 2 : 65%, Al 2 O 3 : 25%, CaO: 5%, MgO; 5%.

[0034] After baking the slag system, after stirrin...

Embodiment 2

[0037]Electroslag remelting is used to smelt high-end hot work die steel electrode rods. The chemical composition of the base metal of hot work die steel electrode rods for electroslag remelting is: C: 0.43%, Si: 0.96%, Mn: 0.35 %, P: 0.018%, S: 0.010%, Cr: 5.03%, Mo: 1.55%, V: 0.97%, balance Fe and impurities. Before smelting, the electrode rod is subjected to tumbling treatment to remove the iron oxide scale on the surface of the electrode rod, and the surface of the electrode rod is smooth and free of rust.

[0038] Before mixing the slag, the various raw materials of the slag were baked at a temperature of 780 degrees Celsius for 8 hours to completely remove the moisture in the slag. The mass of the slag is 9.8% of the mass of the electroslag remelting electrode rod, and the composition of the electroslag remelting slag system is calculated by mass percentage: CaF 2 : 64.5%, Al 2 O 3 : 24%, CaO: 7.5%, MgO; 4%.

[0039] After baking the slag system, after stirring evenl...

Embodiment 3

[0042] Electroslag remelting is used to smelt high-end hot work die steel electrode rods. The chemical composition of the base metal of hot work die steel electrode rods for electroslag remelting is: C: 0.44%, Si: 0.99%, Mn: 0.38 %, P: 0.015%, S: 0.012%, Cr: 5.15%, Mo: 1.28%, V: 1.07%, balance Fe and impurities. Before smelting, the electrode rod is subjected to tumbling treatment to remove the iron oxide scale on the surface of the electrode rod, and the surface of the electrode rod is smooth and free of rust.

[0043] Before mixing the slag, the various raw materials of the slag were baked at a temperature of 800 degrees Celsius for 8 hours to completely remove the moisture in the slag. The mass of the slag is 10% of the mass of the electroslag remelting electrode rod, and the composition of the electroslag remelting slag system is calculated as a percentage by mass: CaF 2 : 63.9%, Al 2 O 3 : 24.1%, CaO: 8%, MgO; 4%.

[0044] After baking the slag system, after stirring ...

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Abstract

The invention discloses an electroslag remelting method for smelting high-cleanliness hot work die steel in the technical field of iron and steel smelting, an electroslag remelting slag system mainly comprises the following chemical components in percentage by mass: 60%-65% of CaF2, 20%-25% of Al2O3, 5%-10% of CaO and 1%-5% of MgO. The smelting process comprises the following steps that firstly, slag materials are weighed according to the proportion, and the mixed slag materials are subjected to drying treatment; then aluminum particles are mixed into the slag according to the proportion that the mass fraction of the slag is 0.375%-0.450%, finally, the slag is filled, arcing smelting is conducted, and in the smelting process, aluminum particle silicon-calcium powder is added at set intervals for deoxidation. According to the method, by adding a proper amount of CaO and MgO, the alkalinity of a slag system is improved, the desulfurization capacity of the slag system is enhanced, a stable oxide Al2O3 can be produced and oxygen elements can be effectively removed in the remelting process by adding a proper amount of aluminum particles during slag mixing and adding a certain amount of aluminum particles at regular intervals, the cleanliness of a hot work die steel electroslag remelting finished product is improved, and the quality of the hot work die steel electroslag remelting finished product is improved. And meanwhile, the production cost is also reduced.

Description

technical field [0001] The invention relates to the technical field of iron and steel smelting, in particular to an electroslag remelting method for smelting high cleanliness hot work die steel. Background technique [0002] At this stage, the main hot work die steel used in my country is the national standard H13 (4Cr5MoSiV1), and the H13 series steel is C-Cr-Mo-Si-V martensitic hot work die steel, which is widely used in the manufacture of hot extrusion dies and die casting dies. , hot trimming dies, hot forging dies and hot stamping dies, etc. During its use, it is subjected to physical and chemical effects such as wear, thermal fatigue, erosion, stress corrosion, and surface thermal welding, so it has high requirements for its cleanliness and quality control. At present, in the traditional industrial smelting process, in order to further obtain high cleanliness and uniform and dense steel ingots, electroslag remelting process is used to reduce harmful elements and inclus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B9/18C22C38/02C22C38/04C22C38/22C22C38/24
CPCC22B9/18C22C38/02C22C38/04C22C38/22C22C38/24
Inventor 蒋琪吴铖川王洪利唐佳丽
Owner CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD