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Steel for a plastic molding die

A technology for forming molds and plastics, which is applied in the field of steel for plastic forming molds. It can solve the problems of uneven processing of carving molds and poor precision of finishing, and achieve the effect of excellent mirror surface processing and sufficient hardness.

Inactive Publication Date: 2006-12-13
DAIDO STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, in the alloy disclosed in Patent Document 1, coarse precipitated carbonitrides are likely to be formed in the manufacturing stage, and due to the difference in hardness between the generated coarse precipitated carbonitrides and the parent phase, processing unevenness occurs during engraving, etc. The problem of poor finishing accuracy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0067] Hereinafter, the present invention will be specifically described using examples.

[0068] Utilize the high-frequency induction furnace that can carry out pressurization, after smelting the steel (the steel of embodiment 1~the embodiment 16, the steel of comparative example 1~comparative example 6) of the chemical composition shown in Table 1, cast into 50kg, by heat Forged to make 60mm square bars respectively.

[0069] C

Si

mn

P

S

Ni

Cr

Mo

W

Mo+

1 / 2W

V

Al

O

N

other

Example 1

0.80

0.81

0.10

0.017

0.030

1.00

18.1

0.7

1.10

1.25

0.13

0.210

0.015

0.60

Ca=0.05

Example 2

0.71

1.00

1.70

0.026

0.021

0.53

20.0

0.4

0.20

0.50

0.69

0.440

0.008

0.71

Ti=0.13

Ex...

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PUM

PropertyMeasurementUnit
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Abstract

To provide a steel for plastic molding die which possesses enough hardness, wear resistance and corrosion resistance, and is excellent in high-precision processability and mirror polishing properties. The steel for a plastic molding die contains not more than 0.80 wt% C, not less than 0.01 wt% and less than 1.40 wt% Si, not less than 0.05 wt% and not more than 2.0 wt% Mn, not less than 0.005 wt% and not more than 1.00 wt% Ni, not less than 13.0 wt% and not more than 20.0 wt% Cr, not less than 0.20 wt% and not more than 4.0 wt% Mo + 1 / 2 W, not less than 0.01 wt% and not more than 1.00 wt% V, not less than 0.36 wt% and not more than 0.80 wt% N, not more than 0.02 wt% O, not more than 0.80 wt% A1, and the remainder substantially including Fe and unavoidable impurities.

Description

technical field [0001] The invention relates to a steel for plastic forming molds. Background technique [0002] In recent years, various plastic molded products are used in various fields. For example, a plastic molded product is generally molded into a desired shape using a plastic molding die such as an injection molding die. [0003] However, fillers such as glass fibers are often added to plastic molding materials from the viewpoint of improving the strength of molded products by adding the main component resin. Such additives will wear the mold, so that the dimensional accuracy of the obtained plastic molded product will decrease, resulting in a reduction in the life of the mold. [0004] In addition, plastic molding materials generate corrosive gases due to decomposition of resin during kneading and the like. If such corrosive gas is compressed in the mold to high temperature and high pressure, the mold will be corroded, and the surface roughness and flashing of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/46C22C38/50
Inventor 伊吹基宏滨野修次古贺猛
Owner DAIDO STEEL CO LTD
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