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A kind of cr-mo-si-v system cold working die steel and its preparation method

A technology of cr-mo-si-v and cold work die steel, which is applied in the field of Cr-Mo-Si-V cold work die steel and its preparation, can solve the problem that carbides are not spheroidized and carbides are not uniformly dispersed distribution and other issues to achieve the effect of improving dispersion distribution, improving spheroidization effect and reducing cracking

Active Publication Date: 2020-04-28
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Liu Hongyan published "The Effect of Heat Treatment on the Microstructure and Properties of Cold Work Die Steel" in "Casting Technology" in 2016 (Vol.24, no.6, p1123-1125), and proposed 1.52C-3.68Cr-8.6W-5.61 The annealing process of Mo cold work die steel is: 900 ° C × 2h + furnace cooling to 600 ° C, and then air cooling out of the furnace, the annealed structure under the high-power scanning electron microscope is as follows figure 1 As shown, there are obvious large carbides that are not spheroidized, and the effect of pretreatment to disperse and evenly distribute carbides has not been achieved.

Method used

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  • A kind of cr-mo-si-v system cold working die steel and its preparation method
  • A kind of cr-mo-si-v system cold working die steel and its preparation method
  • A kind of cr-mo-si-v system cold working die steel and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0048] A Cr-Mo-Si-V series cold work die steel, the composition of which is as follows by weight percentage: C: 0.85%, Si: 0.80%, Mn: 0.30%, P: 0.0047%, S: 0.0045%, Mo: 1.60 %, Cr: 7.00%, V: 0.15%, and the balance is Fe and other unavoidable impurity elements.

[0049] The preparation method of described Cr-Mo-Si-V series cold work die steel forging billet comprises the following steps:

[0050] Step 1, smelting:

[0051] Put the Cr-Mo-Si-V series cold working die steel raw material components into the vacuum according to the ratio of 0.5×10 -2 Pa high-frequency vacuum induction heating furnace, heated to 1500 ° C, after the raw materials are melted into molten steel, smelted for 5 minutes, and high-purity argon gas is introduced;

[0052] Step 2, casting:

[0053] Cast molten steel into the sand mold, remove the mold and clean the surface of the ingot;

[0054] Step 3, forging:

[0055] Heat the steel ingot to 1160°C, keep it warm for 3 hours, and place it on a 12MN free...

Embodiment 2

[0068] A Cr-Mo-Si-V series cold work die steel, the composition is as follows by weight percentage: C: 1.10%, Si: 0.95%, Mn: 0.40%, P: 0.0049%, S: 0.0045%, Mo: 2.20 %, Cr: 8.50%, V: 0.28%, and the balance is Fe and other unavoidable impurity elements.

[0069] The preparation method of described Cr-Mo-Si-V series cold work die steel forging billet comprises the following steps:

[0070] Step 1, smelting:

[0071] Put the Cr-Mo-Si-V series cold work die steel raw material components into the vacuum according to the ratio of 0.6×10 -2 Pa high-frequency vacuum induction heating furnace, heated to 1550 ° C, after the raw materials are melted into molten steel, smelted for 6 minutes, and high-purity argon gas is introduced;

[0072] Step 2, casting:

[0073] Cast molten steel into the sand mold, remove the mold and clean the surface of the ingot;

[0074] Step 3, forging:

[0075] Heat the steel ingot to 1170°C, keep it warm for 3.5 hours, and place it on a 12MN free forging h...

Embodiment 3

[0088] A Cr-Mo-Si-V series cold work die steel, the composition is as follows by weight percentage: C: 1.40%, Si: 1.00%, Mn: 0.5%, P: 0.0046%, S: 0.0048%, Mo: 2.5 %, Cr: 12.50%, V: 0.4%, and the balance is Fe and other unavoidable impurity elements.

[0089] The preparation method of described Cr-Mo-Si-V series cold work die steel forging billet comprises the following steps:

[0090] Step 1, smelting:

[0091] Put the Cr-Mo-Si-V series cold work die steel raw material components into the vacuum according to the ratio of 0.6×10 -2 Pa high-frequency vacuum induction heating furnace, heated to 1500 ° C, after the raw materials are melted into molten steel, smelted for 7 minutes, and inert gas is introduced;

[0092] Step 2, casting:

[0093] Cast molten steel into the sand mold, remove the mold and clean the surface of the ingot;

[0094] Step 3, forging:

[0095] Heat the steel ingot to 1170°C, keep it warm for 4 hours, and place it on a 12MN free forging hydraulic press f...

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Abstract

The present invention is a Cr-Mo-Si-V cold work die steel and its preparation method. The steel components and weight percentages are: C: 0.85~1.65%, Si: 0.80~1.10%, Mn: 0.30~0.60% , P<0.0050%, S<0.0050%, Mo: 1.60~3.20%, Cr: 7.00~14.00%, V: 0.15~0.55%, the balance is Fe and other inevitable impurities. The production method is as follows: the raw materials are smelted, cast and forged to form a forged billet and cooled, the corresponding heating rate is controlled, and two heating treatments are performed. After completing one pretreatment, the corresponding heating rate and cooling rate are controlled, and another heating treatment and After two cooling treatments, the second pretreatment is completed, and then quenched and tempered to obtain cold work die steel. The method of the invention has the advantages of low production cost, no pollution, easy operation, significantly improving the carbide spheroidization effect and reducing the hardness through two pretreatment processes, and meeting the requirements of the next step of heat treatment.

Description

Technical field: [0001] The invention belongs to the technical field of metallurgical materials, and in particular relates to a Cr-Mo-Si-V series cold working die steel and a preparation method thereof. Background technique: [0002] The Cr-Mo-Si-V series cold work die steel contains relatively high elements such as C, Cr, Mo, etc., and the eutectoid point E in the iron-carbon phase diagram shifts to the left, and the ledeburite eutectic carbides are seriously generated during the solidification process. dendrite segregation. If the large and irregular ledeburite carbides cannot be dispersed and evenly distributed in the subsequent heat treatment process, local stress concentration will be generated in the steel and cracks will be initiated. There are still ledeburite carbides that are unevenly distributed along the deformation direction and have different sizes in the cold work die steel after forging or rolling; when the large-grained carbides in the steel or the uneven d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/22C22C38/24C21D6/00C21D8/00C22C33/04
CPCC21D6/002C21D6/005C21D6/008C21D8/005C22C33/04C22C38/02C22C38/04C22C38/22C22C38/24
Inventor 李长生贺帅韩亚辉任津毅董竞博
Owner NORTHEASTERN UNIV LIAONING