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1.2316 Pre-hardening-and-tempering plastic mold steel and preparation method thereof

A plastic mold steel, quenching and tempering technology, used in manufacturing tools, heat treatment equipment, quenching agents, etc., can solve problems such as cracking, component segregation, and austenite decomposition that is not decomposed in time, to eliminate stress and prevent crystallites. The effect of grain growth

Inactive Publication Date: 2019-09-06
江油市长祥特殊钢制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] But there is a problem: due to the addition of alloying elements, the Ms point is reduced, and only the quenched martensite is decomposed in the tempering process of pre-hardening and tempering, and a balanced structure is obtained.
However, the decomposition of retained austenite has not been decomposed in time, and it is prone to cracking as time goes by
At the same time, the addition of alloying elements can easily cause composition segregation, local coarse grains, and affect the uniformity of grains.

Method used

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  • 1.2316 Pre-hardening-and-tempering plastic mold steel and preparation method thereof
  • 1.2316 Pre-hardening-and-tempering plastic mold steel and preparation method thereof
  • 1.2316 Pre-hardening-and-tempering plastic mold steel and preparation method thereof

Examples

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preparation example Construction

[0018] Some embodiments of the present invention provide a method for preparing 1.2316 pre-hardened and tempered plastic mold steel, which includes: sequentially performing softening annealing, staged heating, quenching and tempering of 1.2316 pre-hardened and tempered plastic mold steel, and the steps are as follows:

[0019] Softening annealing also includes smelting, and the specific steps are EAF (electric furnace rough refining), LF (ladle refining), VD (vacuum degassing), and pouring.

[0020] Main points of smelting: Lime 15Kg, control Ar gas in the whole process as required, use Ca powder and Al powder to diffuse and reduce,

[0021] Feed Al wire 5M / T, Ca-Si wire 3M / T, remove slag cleanly, refine white slag, evacuate for 20-23 minutes, add argon ring to flush argon after breaking the air, and finally insert Al to 0.10% Ca-Si Line 3M / T Re (rhenium) 1Kg / T plus Cr-N 6kg / T. Re is inserted into the furnace to maintain a weak argon gas for 10 minutes, and then the temperatu...

Embodiment 1

[0051] This example provides the preparation method of 1.2316 pre-hardened quenched and tempered plastic mold steel, S1 softening annealing: heat the temperature in the furnace from 550°C to 760°C for heat preservation, the heat preservation time is 3min / mm, cool down to 500°C and leave the furnace for air cooling;

[0052] Quenching after heating in S2 stage: The temperature in the furnace before quenching is raised according to the following method: raise the temperature in the furnace to 380°C, then to 640°C, then to 840-860°C, and then to 1020°C, and the holding time is 1min / mm, and then carry out oil tempering at 120°C. The calculation of oil cooling is 1h / 100mm;

[0053] S3 tempering treatment: the temperature in the furnace is 520°C, the holding time is 3min / mm, it is air-cooled when it is out of the furnace, and then the tempering treatment is repeated.

Embodiment 2

[0055] This example provides the preparation method of 1.2316 pre-hardened quenched and tempered plastic mold steel, S1 softening annealing: heat the temperature in the furnace from 550°C to 780°C for heat preservation, the heat preservation time is 3min / mm, cool down to 500°C and leave the furnace for air cooling;

[0056] Quenching after heating in S2 stage: The temperature in the furnace before quenching is raised in the following way: raise the temperature in the furnace to 400°C, then to 660°C, then to 840-860°C, and then to 1040°C, the holding time is 1min / mm, and then carry out oil tempering at 150°C. The calculation of oil cooling is 1h / 100mm;

[0057] S3 tempering treatment: the temperature in the furnace is 540°C, the holding time is 3min / mm, it is air-cooled when it is out of the furnace, and then the tempering treatment is repeated.

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Abstract

The invention discloses 1.2316 pre-hardening-and-tempering plastic mold steel and a preparation method thereof, and belongs to the technical field of mold steel preparation. The method includes that the 1.2316 pre-hardening-and-tempering plastic mold steel is subjected to softening annealing, quenching after stage heating and tempering treatment in sequence. The method comprises the following steps of first, softening annealing, wherein heating is carried out to enable the furnace temperature, which is 550 DEG C, to rise to range from 760 DEG C to 780 DEG, and heat preservation is carried outfor 3 minutes per millimeters, then the temperature is lowered to 500 DEG C, and the steel is discharged out of a furnace; second, quenching after stage heating, wherein the furnace temperature beforequenching is enabled to rise in the manner that the furnace temperature is enabled to rise to the temperature of T1, is enabled to rise to the temperature of T2, and then is enabled to rise to the temperature of T3; and third, tempering treatment, wherein the furnace temperature ranges from 520 DEG C to 540 DEG C, the heat preservation ranges from 3 minutes per millimeters, the steel is discharged out of the furnace to be subjected to air cooling, and then tempering treatment is carried out again. In this way, the grain particles of the 1.2316 pre-hardening-and-tempering plastic mold steel are prevented from growing, it is guaranteed that uniform austenite structures are obtained, and additional stress is eliminated.

Description

technical field [0001] The invention belongs to the technical field of mold steel preparation, and specifically relates to a 1.2316 pre-hardened and tempered plastic mold steel and a preparation method thereof. Background technique [0002] 1.2316 is a German brand name, similar to my country's 3Cr17NiMo, which is commonly used in the field of plastic molds because of its excellent corrosion resistance, toughness, and thermal fatigue resistance. However, due to the addition of alloy elements, the Ms point of 1.2316 pre-hardened quenched and tempered plastic mold steel is prone to cracking as time goes by. After pre-hardening and tempering 1.2316, it is hoped to obtain a uniform fine-grained structure (grade 7-8). [0003] But there is a problem: due to the addition of alloying elements, the Ms point is reduced, and only the quenched martensite is decomposed in the tempering process of pre-hardening and tempering, and a balanced structure is obtained. However, the decomposi...

Claims

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Application Information

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IPC IPC(8): C21D1/32C21D1/19C21D1/58C22C38/44C22C38/04C22C38/02
CPCC21D1/19C21D1/32C21D1/58C22C38/002C22C38/02C22C38/04C22C38/44
Inventor 张涛邓吉宁莫敦孙殿军刘仁奇王强张京蓉梁艳张帅军王邵华周颉平何跃川
Owner 江油市长祥特殊钢制造有限公司