Unlock instant, AI-driven research and patent intelligence for your innovation.

Smelting method capable of reducing oxygen content of 4Cr5MoSiV1 steel for hot-working mould

A technology of steel oxygen content and hot work die, applied in the field of metal materials, to meet the requirements of use, low magnification structure and flaw detection quality, and low inclusions

Active Publication Date: 2016-08-24
青海西钢特殊钢科技开发有限公司
View PDF1 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Xining Special Steel Co., Ltd. is an old special steel enterprise that produces die steel. In response to the needs of the market, during the production of 4Cr5MoSiV1 steel, the smelting and production process of the steel has been optimized successively, so that the internal quality of the steel has been greatly improved. , but the oxygen content in the steel is 18-35ppm, compared with the domestic best level of 20ppm and the international best level of 15ppm (Pang Yonggang, Hou Mingshan, Hu Jiancheng, etc. 40t EBT EAF-LF-VD-ingot casting process smelting mold Cleanliness analysis of steel H13 [J]. Special Steel, 2013, 34(5): 61-63.), there is still a certain gap

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Smelting method capable of reducing oxygen content of 4Cr5MoSiV1 steel for hot-working mould

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] 1. Ingredients

[0052] The iron and steel material is composed of steel cutting heads returned by the factory and pig iron (concentrated material), and the carbon content is ≥ 1.2%.

[0053] Two, electric furnace oxidation

[0054] The slag material is composed of lime, fluorite, and light-burned dolomite; the amount of lime, fluorite, and light-burned dolomite is adjusted according to the slag condition, and the total amount of slag material is controlled at 40-50Kg / t.

[0055] After full melting, the temperature is ≥1580°C, and oxidation begins; the oxygen blowing pressure is controlled at 0.5-0.7MPa; the decarburization amount is ≥0.40%.

[0056] Composition and content of the end point of oxidation: C ≥ 0.10%, P ≤ 0.012%; slag removal ≥ 95%.

[0057] 3. Initial reduction of electric furnace

[0058] Add 350kg of lime and 100kg of fluorite; pour in baked ferrochromium and ferromolybdenum, power on for ≥15 minutes, and decarburize by blowing oxygen after complete ...

Embodiment 2

[0071] 1. Ingredients

[0072] The steel material is composed of low-phosphorus steel, the return of this steel type and electrode blocks, with carbon content ≥ 0.80%, and ferrochrome is added after baking.

[0073] Two, electric furnace oxidation

[0074] Adjust the amount of lime, fluorite and light-burned dolomite according to the slag condition, and control the total amount of slag to 30-40Kg / t.

[0075] After full melting, the temperature is ≥1580°C, and oxidation begins; the oxygen blowing pressure is controlled at 0.5-0.7MPa; the decarburization amount is ≥0.20%.

[0076] The electric furnace slag is composed of lime and light-burned dolomite; adjust the amount of lime, fluorite, and light-burned dolomite according to the slag condition, and the total amount of slag is controlled at 25-35Kg / t

[0077] 3. Initial reduction of electric furnace

[0078] Add 480kg of CaO and 90kg of fluorite; turn over baked ferromolybdenum, power on for 20 minutes, blow oxygen to decarb...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a smelting method capable of reducing oxygen content of 4Cr5MoSiV1 steel for a hot-working mould. The smelting method comprises the following steps: carrying out preliminary reduction at the later period of electric furnace smelting, and carrying out diffusion deoxidation by use of aluminum powder and carbon powder, and controlling aluminum content in molten steel to be within a range from 0.01% to 0.03%; during external refining, feeding an aluminum wire in advance, and carrying out diffusion deoxidation by use of the carbon powder and the aluminum powder during refining; and adopting vacuum degassing, not feeding the aluminum wire before and after aluminum degassing, and carrying out weak-argon stirring after molten steel degassing for sufficiently floating inclusions. The smelting method has the advantages that: the smelting method adopting 4Cr5MoSiV1 steel with oxygen content lower than that of the 4Cr5MoSiV1 steel for a current hot-working mould is provided by optimizing and controlling a deoxidant type, an alloy adding sequence, a furnace slag composition, deoxidant adding time, aluminum content in molten steel and the like during steel smelting in case of not changing smelting cost; and the hot-working mould with relatively good macrostructure and flaw detection quality of steel as well as low inclusions can completely meet the using requirements of a high-quality mould steel product.

Description

technical field [0001] The invention relates to a method for smelting ordinary electric furnace steel for molds, in particular to a smelting method for reducing oxygen content in 4Cr5MoSiV1 steel for high-quality hot-working molds, and belongs to the field of metal materials. Background technique [0002] With the rapid development of the mold industry, the requirements for mold steel continue to increase. Reducing the total oxygen content in H13 steel and reducing inclusions in steel are effective ways to improve the service life of molds. The research results of a large number of metallurgists show that, for the mold steel that is dominated by fatigue damage, inclusions are one of the important reasons that affect its life (Zong Yaping, Hao Shiming, Wang Jijie. The influence of different refining processes on the thermal fatigue properties of mold steel, Mechanical Engineering Materials [J], 1992, 16(3): 50-53; Cai Fang, Du Guanghua, Qiu Deqing. Microstructure and Metallur...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/52C21C7/06C21C7/10
CPCC21C5/52C21C7/06C21C7/10Y02P10/20
Inventor 张燕东陈列苗红生贺文成李明林孟凡哲马恒春
Owner 青海西钢特殊钢科技开发有限公司