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Hot work tool steel and mold member excellent in resistance to melting

A lossy, melting-resistant technology, applied in the direction of manufacturing tools, metal processing equipment, metal material coating technology, etc., can solve the problems of base metal melting loss and other problems, achieve the reduction of repair costs, reduce costs, and extend the repair cycle Effect

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

[0008] However, in the case of carrying out the modification treatment according to such surface treatment, although the melting loss can be prevented during the initial period when the modified layer of the surface layer remains, but because the modified layer of the surface layer disappears therewith, the After the base metal is melted and lost, there are the same problems as above

Method used

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  • Hot work tool steel and mold member excellent in resistance to melting
  • Hot work tool steel and mold member excellent in resistance to melting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0120] In order to increase the nitrogen concentration in the steel ingot, 50 kg of steel with the composition shown in Table 1 was melted and cast in a pressurized melting furnace capable of pressurizing the entire melting and casting device up to 10 atmospheres. However, the conventional steels in Table 1 were melted and cast in a vacuum melting furnace.

[0121] Table 1 chemical composition

[0122]

[0123] 19

0.33

0.24

0.58

6.92

1.98

-

1.98

0.14

0.0023

0.143

0.473

2.31

-

-

4.98

0.021

0.012

0.043

″

Se: 0.0065%

Te: 0.0041%

20

0.26

0.19

0.61

6.24

2.76

-

2.76

0.35

0.0014

0.162

0.422

1.60

-

-

0.033

0.013

0.008

″

M...

Embodiment 2

[0155] Regarding the steel (example and conventional steel) with the composition shown in Table 4, a 50 kg ingot was melted in the same pressurized melting furnace (example) and vacuum induction furnace (conventional steel) as in Example 1, and cast into a circle of Φ20 mm. material, and then tempered at 870°C.

[0156] differentiate

[0157] Next, after the examples and conventional steels were cut into three lengths of 200 mm each, they were roughly machined to Φ15 mm×200 mm by turning, and then tempered at 1030°C×1hr, and then tempered at 580-590°C×8hr. Temper twice to adjust the hardness to HRC38, 45, 52 respectively.

[0158] Then, these are finished into the shape of cast-drawn pins, and then surface treatment for surface modification is performed.

[0159] Here, as for the surface treatment, in the examples and conventional steels, the HRC38 material was subjected to gas nitrocarburization under the condition of 525°C×2.5hr, and the HRC52 material was formed ...

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Abstract

A hot work tool steel having a chemical composition in wt %: C: 0.10 to 0.35 %, Si: less than 0.80 %, Mn: 3.0 % or less, Cr: 2.0 % or more and less than 7.0 %, N: more than 0.05 % and 0.50 % or less, O: 0.0100 % or less, P: 0.050 % or less, Al: 0.050 % or less, with the proviso that 1 / 2W + Mo: 0.3 to 5.0 %, C + N: 0.20 to 0.60 % and C / N: 6 or less, and the balance: substantially Fe, and optionally V: 0.01 to 0.5 %. The hot work tool steel exhibits excellent resistance to melting, while retaining good toughness and good resistance to heat checking.

Description

technical field [0001] The present invention relates to a high-temperature tool steel and a die member suitable for die members for Al die-casting and excellent in melting loss resistance. Background technique [0002] For a long time, JISSKD61 and SKD6 have been used as materials for the die body, center type (neutron), insert die (renzipin) and hot liquid metal pipe (hereinafter, these are collectively referred to as mold components) for Al die casting. , High temperature tool steel such as SKD62. [0003] However, Fe has a strong affinity with Al, and the mold member is relatively easy to react with the Al melt to form Fe-Al intermetallic compounds and the like, so that the surface layer is likely to fall off, which is the so-called melting loss (melting loss). This melting loss also includes shedding based on abrasion and sintering (melting). [0004] This melting loss is particularly likely to occur at the level difference between the high-temperature Al melt and the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C22C38/38C22C38/60C22C9/06B22D17/22B22C9/06B22D21/00
CPCB22D21/007C22C38/04C22C38/22B22C9/061C22C38/60B22D17/2209C22C38/24C21D8/021C21D8/0426C22C38/001C22C38/002C22C38/02C22C38/16C22C38/30C22C38/38C22C38/44C22C38/46C23C8/26C23C8/32C23C8/38C23C8/50C23C8/56C23C30/00
Inventor 仓田征儿藤井利光
Owner DAIDO STEEL CO LTD
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