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Ultrahigh carbon tool steel hot-rolled steel plate and production method thereof

A technology of hot-rolled steel plate and production method, which is applied in metal rolling and other directions, can solve the problems of uncontrolled product performance and narrow quenching temperature range of ultra-high carbon tool steel, and achieve the improvement of salt spray corrosion-type anti-rust performance, Improved process robustness, depth attenuation effect

Pending Publication Date: 2022-07-22
湖南华菱涟钢特种新材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a hot-rolled ultra-high carbon tool steel steel plate and its production method, which is used to solve the problem that the quenching temperature range of ultra-high carbon tool steel is relatively narrow, and the product performance is not affected during the manufacturing process. control problem

Method used

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  • Ultrahigh carbon tool steel hot-rolled steel plate and production method thereof
  • Ultrahigh carbon tool steel hot-rolled steel plate and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A method for producing ultra-high carbon tool steel hot-rolled steel sheet, the molten iron enters KR for desulfurization, the sulfur content of the molten iron is 0.003%, the molten iron in the molten iron ladle is poured into a converter, and after smelting for 35 minutes, the molten steel is tapped, and the molten steel temperature is 1599°C, The carbon content of the obtained molten steel is 0.15%. The molten steel is refined in the LF furnace, 200Kg of high-quality refining slag and 200Kg of lime are added, the alloy composition is adjusted in place, soft blowing for 10min, sedation for 12min, the top slag is white slag, out of the LF station, The outgoing temperature of molten steel is 1521℃.

[0041] Smelting in RH vacuum furnace, vacuuming to 67Pa, circulating molten steel for 15min, feeding calcium wire for 100m, at this time, the components and mass percentages of molten steel are: C: 1.11%, Si: 0.28%, Mn: 0.41% , Cr: 0.13%, Ni: 0.15%, Nb: 0.022%, P: 0.011%, S...

Embodiment 2

[0044] A method for producing ultra-high carbon tool steel hot-rolled steel sheets. The molten iron enters KR for desulfurization, and the sulfur content of the molten iron out of the station is 0.001%. The carbon content of the obtained molten steel is 0.11%, the molten steel is refined in the LF furnace, 200Kg of high-quality refining slag and 200Kg of lime are added, the alloy composition is adjusted in place, soft blowing for 10min, sedation for 12min, the top slag is white slag, out of LF station, molten steel Outbound temperature 1526℃.

[0045] Smelting in RH vacuum furnace, vacuuming to 67Pa, circulating molten steel for 15min, feeding calcium line for 100m, at this time, the components and mass percentages of molten steel are: C: 1.21%, Si: 0.25%, Mn: 0.43% , Cr: 0.16%, Ni: 0.14%, Nb: 0.021%, P: 0.010%, S: 0.002%, the rest are Fe and inevitable impurity elements, and the molten steel exit temperature is 1498 ° C.

[0046] The thin slab is continuously cast into a bil...

Embodiment 3

[0048] A method for producing ultra-high carbon tool steel hot-rolled steel sheet, the molten iron enters KR for desulfurization, and the sulfur content at the exit is 0.002%; the molten iron in the molten iron ladle is poured into a converter, and the molten steel is tapped after smelting for 32 minutes, and the molten steel temperature is 1635 ° C. The carbon content of the molten steel is 0.088%; the molten steel is refined in the LF furnace, 200Kg of high-quality refining slag and 200Kg of lime are added, the alloy composition is adjusted in place, soft blowing for 10min, sedation for 12min, the top slag is white slag, out of the LF station, the molten steel comes out Station temperature 1518 ℃.

[0049] Then smelt in RH vacuum furnace, evacuate to 67Pa, circulate molten steel for 15min, and feed calcium wire for 100m; at this time, the components and mass percentages of molten steel are: C: 1.33%, Si: 0.20%, Mn: 0.45% , Cr: 0.15%, Ni: 0.18%, Nb: 0.025%, P: 0.009%, S: 0.00...

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Abstract

The invention discloses an ultrahigh carbon tool steel hot-rolled steel plate which is composed of the following elements in percentage by mass: 1.0-1.35% of C, 0.10-0.35% of Si, 0.10-0.50% of Mn, 0.1-0.2% of Cr, 0.15-0.25% of Ni, 0.02-0.03% of Nb, less than or equal to 0.020% of P, less than or equal to 0.006% of S and the balance of Fe and inevitable impurity elements. By the adoption of the technical scheme, 0.1%-0.2% of Cr, 0.15%-0.25% of Ni and 0.02%-0.03% of Nb are added to chemical components contained in the prepared ultrahigh carbon tool steel hot-rolled steel plate, a quenching process window of the ultrahigh carbon tool steel hot-rolled steel plate material is expanded by adding a small amount of alloy elements and microalloy elements, and the process robustness can be improved; in addition, the comprehensive performance of the hot-rolled steel plate of the ultrahigh carbon tool steel is also improved.

Description

technical field [0001] The invention relates to the technical field of tool steel production, in particular to an ultra-high carbon tool steel hot-rolled steel plate and a production method thereof. Background technique [0002] Ultra-high carbon tool steel is a steel material with a carbon content of 1.0-1.35%, which is used to manufacture cutting tools, measuring tools and wear-resistant tools. It requires high hardness, wear resistance and hardenability. As the carbon content in the steel increases, the hardness after quenching will also increase. When the carbon content is about 0.8% (solution carbon is about 0.6%), the hardness is close to the maximum value. If the carbon content continues to increase, the hardness will increase. Appreciation has been very limited. This is due to the high content of carbon after the steel is heated to austenite, the austenite stability is higher, the martensite transformation temperature decreases, the transformation of austenite to ma...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/48C22C33/04B21B1/46C21D8/02C21D1/18
CPCC22C38/02C22C38/04C22C38/48C22C33/04B21B1/466C21D8/0205C21D8/0226C21D8/0247C21D1/18
Inventor 曾斌汪净梁亮齐江华郭政伟戴智才陶一郡梁浩
Owner 湖南华菱涟钢特种新材料有限公司