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Hot work tool steel and steel product using the same

A technology of 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 reduced Cr impact value, shortened mold life, high mold temperature, etc., and achieve long mold life and low transition temperature , the effect of high thermal conductivity

Inactive 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
[0030] In Patent Documents 9 and 10, there may be a decrease in thermal conductivity due to excessive Si, or a 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

[0153] In order to manufacture each of the inventive steel materials in Example B below, Examples 1 to 5 were carried out to study the preferable Si amount, Mn amount, Cr amount, Mo amount, and V amount.

Embodiment 1

[0154] (Example 1: Research on Si content)

[0155] Research on the optimal amount of Si and refer to figure 1 and figure 2 to describe.

[0156] figure 1 It shows that when cutting steel composed of 0.33 mass % of C, 0.82 mass % of Mn, 5.73 mass % of Cr, 1.63 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 μm is judged as the e...

Embodiment 2

[0161] (Example 2: Research on Mn content)

[0162] Research on the preferred content of Mn and refer to image 3 and Figure 4 to describe.

[0163] image 3 The impact value at room temperature is plotted against the content of Mn for a steel consisting of 0.33% by mass of C, 0.08% by mass of Si, 5.75% by mass of Cr, 1.60% by mass of Mo, 0.60% by mass of 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...

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Abstract

The present invention provides a hot work tool steel containing: 0.20 C 0.50 mass%, 0.01 Si 0.25 mass%, 0.50<Mn 1.50 mass%, 5.24<Cr 9.00 mass%, 1.24<Mo<2.95 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 of the present invention is assured of machinability industrially allowing for working into a die shape and enhanced in the thermal conductivity and impact value as compared with general-purpose die steel (for example, JIS SKD61).

Description

technical field [0001] This invention relates to hot-worked tool steel and steel products made from it. More specifically, the present invention relates to a hot-worked tool steel having reliable machinability, capable of being processed into a mold shape industrially assured, and a steel product made therefrom, and compatible with general-purpose Compared with die steel (such as JIS SKD61), its thermal conductivity and impact value are improved. 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 JIS SKD61 has a high transformation temperature of bainite transformation at a low cooling rate (so-called...

Claims

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Application Information

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IPC IPC(8): C22C38/24C22C38/30C22C38/54C22C38/60
CPCC22C38/42C22C38/26C21D6/002C22C38/30C22C38/02C22C38/28C21D7/13C22C38/04C22C38/22C22C38/24
Inventor 河野正道
Owner DAIDO STEEL CO LTD
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