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Method for adding additive for electroslag remelting alloy tool and die steel

A technology for tool and die steel and electroslag remelting, which is applied in the field of adding additives for electroslag remelting alloy tool and die steel, can solve the problems of large oxidation burning loss of active metamorphic elements, low yield and less metamorphism, and achieves Avoid oxidative burning loss, high yield, good effect of deterioration

Inactive Publication Date: 2009-07-22
ZHEJIANG ZHENGDA MOLD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the electroslag remelting process, researchers usually add rare earth alloys or other deoxidizing and desulfurizing modifiers to enhance the performance of the steel. In the traditional process, additives (modifiers) are added to the ladle (steel drum), because steel slag Mixed with low yield (less than 10%), the metamorphism of steel is not obvious; or added to the electroslag remelting refining slag, because it is first oxidized by the oxygen in the slag, the active metamorphic elements are oxidized and burned, and the metamorphism is relatively large. few

Method used

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  • Method for adding additive for electroslag remelting alloy tool and die steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A method for adding additives for electroslag remelting alloy tool and die steel, comprising the following steps:

[0016] (1) The additives are evenly dropped on the surface of the low-carbon mild steel strip through the funnel of the wrapping machine, and the steel strip with additives passes through multiple cold-bending rolls of the wrapping machine, and gradually deforms the radial deformation on both sides of the strip, bends and rolls it Closed metal cored wire; mild steel strip wall thickness 0.3 mm, width 40 mm; metal cored wire inner diameter φ12 mm.

[0017] (2) Hang the metal cored wire directly into the steel mold of the consumable electrode.

Embodiment 2

[0018] Embodiment 2 impact resistance test

[0019] Electroslag remelted die steels were tested with different additive addition methods, and the impact resistance of the electroslag remelted die steels was tested. The test results are shown in Table 1:

[0020] Table 1 Effect of different processes on the impact resistance of die steel

[0021]

[0022] Note: The additives in different processes are the same formula.

[0023] As can be seen from the results in Table 1, the addition method of the present invention can greatly improve the impact resistance of the mold steel.

Embodiment 3

[0025] Using different additive addition methods for electroslag remelting die steel H13, the thermal fatigue test was carried out on the electroslag remelting die steel. The test results are shown in Table 2:

[0026] Table 2 Effect of different processes on thermal fatigue properties of die steel

[0027] parameter Adding additives to the ladle Adding additives to heavy slag Adopt embodiment 1 to add method surface damage factor 2.99×10 -4 2.89×10 -4 3.50×10 -4 depth damage factor 2.34×10 -2 2.36×10 -2 1.23×10 -2 total damage factor 7.00×10 -6 7.12×10 -6 4.31×10 -6

[0028] Note: The additives in different processes are the same formula.

[0029] From the above analysis and comparison, it can be seen that the thermal fatigue performance of the mold steel is greatly enhanced by hanging the metal cored wire wrapped with additives in the electroslag remelting process in the method of the present invention.

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Abstract

The invention relates to an adding method of additives of electroslag remelting alloy tool and die steel and the method comprises the following steps: (1) the additives are packed up by using metal pipes and rolled into metal cored-wire; and (2) the metal cored-wire is directly hung in a consumable electrode steel mould. The adding method can avoid the oxidation loss of active modification elements caused by steel slag mixing and molten slag oxidation, the yielding rate is high (over 30 percent) and the modification effect of steel is good.

Description

(1) Technical field [0001] The invention relates to a method for adding additives for electroslag remelting alloy tool and die steel. (2) Background technology [0002] Electroslag remelting is a refining process widely used worldwide in the production of high-quality steel. Its importance in the production of high-quality fine steels has been proven during its decades of use in production practice. The working principle of electroslag remelting is: a large-capacity current is passed into the slag pool, the consumable electrode is melted by the high heat generated by the slag, and the metal droplets dripping from the end of the electrode are purified during the process of passing through the slag pool , and gradually solidified into ingots in the crystallizer. In the early stage, the process can effectively deoxidize and desulfurize, coupled with the effect of controlling solidification, the distribution characteristics of non-metallic inclusions are greatly improved. Wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B9/10C22B9/18
Inventor 吕广奇
Owner ZHEJIANG ZHENGDA MOLD
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