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Steel powder and die using same

A powder and mold technology, applied in the field of steel powder, can solve the problems of no involvement, low corrosion resistance, low thermal conductivity, etc., and achieve the effect of cooling efficiency and high performance

Active Publication Date: 2016-08-03
DAIDO STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, cooling efficiency has reached its limit, and further improvement of cooling efficiency is difficult
Due to reasons that inhibit the improvement of cooling efficiency, there are the following problems: (1) low thermal conductivity, (2) crack promotion of water cooling holes and (3) low corrosion resistance
In addition, these patent documents do not relate to an embodiment in which steel is used in powder form as a material for the laminate forming method

Method used

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  • Steel powder and die using same
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  • Steel powder and die using same

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Experimental program
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Embodiment

[0153] Dies and test pieces were produced by the lamination molding method by using 34 kinds of steel powders shown in Table 1, and various tests were performed. Specifically, tests for evaluating hardness, thermal conductivity, mold surface temperature, thermal cracking, and cracking of water cooling holes were performed.

[0154] Some of the steel powders shown in Table 1 contain elements not shown in the table within the range specified as the amount of impurities.

[0155] In Table 1, Comparative Steel 1 is JISSKD61-type steel, Comparative Steel 2 is 18Ni maraging steel, Comparative Steel 3 is martensitic stainless steel SUS420J2, and Comparative Steel 4 is steel SCM435 for machine structure. In each comparative steel, the amounts of at least two elements were outside the range specified by the present invention.

[0156] Table 1: Chemical composition (mass %) (balance: Fe)

[0157]

[0158] Table 1 (continued) chemical composition (mass%) (balance: Fe)

[0159]

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Abstract

The invention relates to steel powder and a die using the same. The steel powder comprises has a composition containing, by mass percentage, 0.10<=C<0.25, 0.005<=Si<=0.600, 2.00<=Cr<=6.00, -0.0125x[Cr]+0.125<=Mn<= -0.100x [Cr]+1.800, wherein [Cr] represents the value of Cr content by mass percentage, 0.01<=Mo<=1.80, -0.00447 * [Mo]+0.010<=V<=-0.1117 * [Mo]+0.901 , wherein the [Mo] represents the value of Mo content by mass percentage, 0.0002<=N<=0.3000, and the balance being Fe and unavoidable impurities.

Description

technical field [0001] The present invention relates to a steel powder having excellent thermal conductivity and corrosion resistance, and a mold produced by using the steel powder. Background technique [0002] Generally, steel ingots are produced by melting steel, which are then forged and / or rolled to produce block or flat square material, which are cut by machining to form mold-shaped products, and then the mold-shaped products Applying heat treatment such as quenching or tempering to manufacture molds such as injection molding dies, die casting dies, hot press (also called hotstamp or diequench) dies for molding resins and rubber, etc. or die head. [0003] With these molds, cooling of the mold is generally performed by providing a cooling circuit (water cooling line) inside it and passing cooling water through the cooling circuit. [0004] In such molds, increasing the efficiency of cooling with cooling water leads to shortening of cycle time, that is, rapid cycle pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/18C22C38/12C22C38/04C22C38/02B22F1/00B22F3/10B22D17/22B29C45/26B21D37/01C21D1/673
CPCB21D37/01B22D17/22B22F1/00B22F3/10B29C45/26C21D1/673C22C38/001C22C38/02C22C38/04C22C38/12C22C38/18
Inventor 河野正道
Owner DAIDO STEEL CO LTD
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