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Martensitic stainless steel nitrogen alloying method for plastic mold

A technology of martensitic stainless steel and nitrogen alloying, which is applied in the field of nitrogen alloying of martensitic stainless steel for plastic molds, can solve the problems of excessive harmful gas content, difficulty in controlling the precision of nitrogen element composition, and harmful gas, etc., and achieve cost reduction, Solve the lack of stability and the effect of solving harmful gases

Inactive Publication Date: 2020-12-11
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method has lower nitrogen alloying cost, it is difficult to control the composition accuracy of nitrogen, and at the same time, it lacks the metallurgical link of vacuum degassing, which may cause the harmful gas content in molten steel to exceed the standard
[0005] CN201910803296.3 discloses a stainless steel material and its preparation method and application. It involves the nitrogen alloying of austenitic stainless steel. The refined melt of the smelting furnace is filled with ammonia and argon mixed at a volume ratio of 3:1. The mixed gas is formed until the pressure in the melting furnace reaches 280MPa, and the pressure is kept for 2.5 minutes to obtain a nitrogen-containing alloy melt; but it uses gas alloying, and there are still problems of insufficient stability of nitrogen components and harmful gases

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The specific operation of the martensitic stainless steel nitrogen alloying of the present embodiment plastic mold is as follows:

[0033] A. The process of 40t electric furnace + LF furnace + VD furnace is used for smelting. After melting and removing P in the electric furnace, the scrap steel is poured into the LF furnace for refining;

[0034] B, LF furnace refining: a, argon gas is blown into and stirred in advance, and after the metal element alloy is completed, the mass percentage of chromium element is controlled to be 13.3% (target value 13.45%), and the carbon mass percentage is 0.35% (target value 0.37%) ), and then change to blowing high-purity nitrogen for about 17 minutes; b. While blowing high-purity nitrogen, the temperature of molten steel is heated to 1590°C by electrodes;

[0035] C. Nitrogen alloying in VD furnace: transfer the LF furnace ladle into the VD furnace, after vacuuming for about 15 minutes, blow in high-purity nitrogen to increase the pre...

Embodiment 2

[0041] The specific operations of the martensitic stainless steel nitrogen alloying method for the present embodiment plastic mold are as follows:

[0042] A. The process of 40t electric furnace + LF furnace + VD furnace is used for smelting. After melting and removing P in the electric furnace, the scrap steel is poured into the LF furnace for refining;

[0043] B, LF furnace refining: a, argon gas is blown in earlier to stir, and after finishing metal element alloy, control chromium element mass percent to be 16.66% (target value 16.8%), carbon mass percent is 0.4% (target value 0.42%) ), and then change to blowing high-purity nitrogen for about 16 minutes; b. While blowing high-purity nitrogen, heat the temperature of molten steel to 1590°C through electrodes;

[0044]C. Nitrogen alloying in VD furnace: transfer the LF furnace ladle into the VD furnace, after vacuuming for about 14 minutes, blow in high-purity nitrogen to increase the pressure in the furnace to increase th...

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Abstract

The invention discloses a martensitic stainless steel nitrogen alloying method for a plastic mold and belongs to the technical field of stainless steel alloying smelting. The invention provides the martensitic stainless steel nitrogen alloying method for the plastic mold in order to solve the problems of nitrogen component uniformity and harmful gas control of the plastic mold. The martensitic stainless steel nitrogen alloying method comprises the following steps of smelting in an electric furnace, LF furnace refining, VD furnace nitrogen alloying and pouring. According to the martensitic stainless steel nitrogen alloying method, the alloying content of chromium and carbon is controlled, nitrogen alloying is carried out by adopting nitrogen-bearing ferrochromium under normal pressure, theaccuracy of each component is accurately controlled, the hydrogen content can be effectively controlled, the problems of insufficient nitrogen component stability and harmful gas are solved, and the nitrogen alloying cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of stainless steel alloying and smelting, and in particular relates to a nitrogen alloying method of martensitic stainless steel for plastic moulds. Background technique [0002] In iron and steel materials, nitrogen is usually controlled as a harmful element. With the development of austenitic stainless steel, the application of nickel alloying technology with nitrogen and manganese has increased the mass percentage of nitrogen to more than 4000ppm. Nitrogen alloying is usually achieved in LF furnace / AOD furnace by low-blowing high-purity nitrogen gas or adding ferrochromium nitride. The former is low in cost, and the nitrogen yield and composition control accuracy are low, while the latter can be more accurately controlled. Alloy composition, but the cost is relatively high. Therefore, how to achieve nitrogen alloying with low cost, high efficiency and high precision is the goal pursued by major enterpris...

Claims

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Application Information

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IPC IPC(8): C22C33/06C21C7/10C21C7/072
CPCC22C33/06C21C7/10C21C7/072C21C2007/0093
Inventor 肖强李俊洪罗许吴欣荣
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP