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Hot work tool steel and steel product using the same

A technology for thermal processing and tool steel, applied in the field of thermal processing tool steel and steel products made from it, can solve the problems of Si machinability deterioration, hardness or impact value reduction, Cr impact value reduction, etc., to reduce production Effects of cost, excellent thermal conductivity, and long mold life

Active Publication Date: 2010-12-22
DAIDO STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, JIS SKD61 has a low thermal conductivity, thereby posing a problem that the mold temperature tends to be high, and the life of the mold is shortened due to frequent occurrence of soldering or thermal cracking
In Patent Document 3, there is a possibility that the phase transformation behavior (hardenability) is insufficient and the impact value decreases because the amount of Mn is too small
In Patent Document 4, machinability may be deteriorated due to too little Si
In addition, in Patent Document 4, the impact value may decrease due to the amount of Cr being too small, or the amount of V being too small or too large
In Patent Document 5, there may be insufficient phase transformation behavior (hardenability) or a decrease in impact value due to too small amount of Mn, decreased high-temperature strength due to too small amount of Mo, or decrease in high-temperature strength due to too small amount of V. or too much to reduce the shock value
[0029] In Patent Documents 6 to 8, there is a possibility that the phase transformation behavior (hardenability) deteriorates, or the hardness or impact value decreases due to too little amount of Cr
[0030] In Patent Documents 9 and 10, there may be deterioration in machinability due to too little Si, decrease in thermal conductivity due to excessive Si, or decrease in impact value due to too small amount of Cr

Method used

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  • Hot work tool steel and steel product using the same
  • Hot work tool steel and steel product using the same
  • Hot work tool steel and steel product using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment A

[0157] In order to prepare the respective inventive steel materials in Example B described below, Examples 1 to 5 were carried out to study the preferred contents of Si, Mn, Cr, Mo and V.

Embodiment 1

[0158] (Example 1: Research on Si content)

[0159] Study the preferred content of Si, and refer to figure 1 and 2 Make the following instructions.

[0160] figure 1 It shows that when cutting a steel material composed of 0.35 mass % of C, 0.82 mass % of Mn, 5.73 mass % of Cr, 1.21 mass % of Mo, 0.62 mass % of V and x mass % of Si, relative to Si Quantity, the distance cut by a cutting tool until the end of its life. exist figure 1 , with regard to the numerical values ​​on the respective plot points, the numerical values ​​on the upper side represent the x value (mass %), and the numerical values ​​on the lower side represent the cut distance (mm). The sample used for evaluation of machinability was a 55mm×55mm×200mm square bar (which was manufactured according to the same procedure as in Example B and softened to a hardness of 90 to 97HRB by spheroidizing annealing), and the cutting tool The time when the maximum amount of wear on the end clearance surface reaches 300 ...

Embodiment 2

[0166] (Example 2: Research on Mn content)

[0167] Study the preferred content of Mn, and refer to image 3 and Figure 4 Make the following instructions.

[0168] image 3 The impact value at room temperature is plotted against the content of Mn for a steel consisting of 0.32 mass % C, 0.42 mass % Si, 5.03 mass % Cr, 1.22 mass % Mo, 0.60 mass % Consists of V and x mass % of Mn. exist image 3 , with regard to the numerical values ​​on the respective plot points, the numerical values ​​on the upper side represent the x value (mass %), and the numerical values ​​on the lower side represent the impact value (J / cm 2 ). The sample used to evaluate the impact value was a square bar of 11 mm × 11 mm × 55 mm (which was manufactured according to the same procedure as in Example B, and was softened to a hardness of 90 to 97 HRB by spheroidizing annealing), which was tested at 1,030 ℃, and then processed to a hardness of 49HRC by rapid cooling and tempering. JIS No. 3 impact te...

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Abstract

The present invention provides a hot work tool steel containing: 0.20 C 0.50 mass%, 0.40<Si<0.75 mass%, 0.50<Mn 1.50 mass%, 5.24 Cr 9.00 mass%, 1.08<Mo<2.99 mass%, and, 0.30<V<0.70 mass%, with the balance being Fe and unavoidable impurities; and a steel product using the hot work tool steel. The hot work tool steel is capable of improving the thermal conductivity as compared with general-purpose die steel (JIS SKD61) and has a higher impact value than that of general-purpose die steel while maintaining machinability at a level equal to or higher than that of general-purpose die steel.

Description

technical field [0001] The present invention relates to hot-worked tool steel and steel products prepared therefrom. More specifically, the present invention relates to a hot-working tool steel capable of improving thermal conductivity compared with general-purpose die steel (JIS SKD61) and maintaining It has a higher impact value than general-purpose die steel while having a machinability equivalent to or higher than that of general-purpose die steel. Background technique [0002] As for mold materials for die casting, hot forging, and warm forging, JIS SKD61, which is excellent in machinability, is generally used. However, JIS SKD61 has low thermal conductivity, thereby posing a problem that the mold temperature tends to be high, and the life of the mold is shortened due to frequent occurrence of soldering or thermal cracking. In addition, as the die size increases, since JISSKD61 has a high transformation temperature of bainite transformation at a low cooling rate (so-c...

Claims

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Application Information

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IPC IPC(8): C22C38/24C22C38/30C22C38/54C22C38/60
CPCC22C33/04C22C38/02C22C38/04C22C33/006C22C38/22C22C38/24C22C38/002C22C38/60
Inventor 河野正道
Owner DAIDO STEEL CO LTD
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