CN101121954A

CN101121954A - H13 steel vacuum time-control quenching heat treatment technique

Info

Publication number: CN101121954A
Application number: CNA2006100298251A
Authority: CN
Inventors: 吴怀成; 王丽莲; 卢军; 石江龙; 田华; 郭健
Original assignee: SHANGHAI RESEARCH INSTITUTE OF MACHINERY MANUFACTURING PROCESS
Current assignee: SHANGHAI RESEARCH INSTITUTE OF MACHINERY MANUFACTURING PROCESS
Priority date: 2006-08-08
Filing date: 2006-08-08
Publication date: 2008-02-13
Anticipated expiration: 2026-08-08
Also published as: CN101121954B

Abstract

The invention discloses a time-controlled sudden cooling vacuum heat treatment process for H13 steel, which includes heating and heat preserving, quenching and tempering; the quenching media for quenching after heating and heat preserving is salt water containing 5 to 10 percent NaC1, and the quenching treatment lasts for 1 to 5 minutes. The invention adopts a special time-controlled sudden cooling process, which not only prevents the danger of cracking during quenching of the salt water, but also greatly improves the quenching quality, so as to effectively improve the impact toughness of the H13 steel after tempering, and thus greatly extends the service life of the mould.

Description

The H13 steel vacuum time-control quenching heat treatment technique

Technical field

The present invention relates to a kind of thermal treatment process, relate in particular to a kind of vacuum heat treatment process of H13 steel.

Background technology

The common invalidation of forge die is cracking and wearing and tearing, improves toughness and then might prolong its life-span significantly.The H13 steel is a kind of die casting steel commonly used, and how improving the impelling strength of H13 steel die and work-ing life by thermal treatment is that people expect the problem that solves always.

High-pressure gas quenching furnace has been widely used in the mold hot processing at present, and domestic main force's type of furnace of using is the air-quenching furnace of cooling pressure 6 crust, and little because of its speed of cooling, it is undesirable to be used for the forge die thermal effectiveness.External increase cooling pressure to 10 crust, 20 that adopts clings to or uses strong cooling gas instead and improve gas quenching speed.This method cost height is difficult to apply at present.Also useful abroad in recent years fused salt is made the vacuum heat treatment process of quenchant, and concrete technology is as follows:

A. will handle part in vacuum oven is heated to quenching temperature and is incubated by setting-up time;

B. adopt fused salt as the heat-eliminating medium quench cooled;

C. tempering.

But be to use fused salt as the heat-eliminating medium speed of cooling not enough, quenching effect still is not ideal enough.

Summary of the invention

Impelling strength and work-ing life that technical problem to be solved by this invention provides a kind of special thermal treatment process can improve the H13 steel die effectively, this process using unconventional chilling quenchant has solved the problem that quench cooling rate influences quenching effect slowly effectively, and processing method has been avoided rimose danger during simultaneously by control etc.

Comprise heat tracing, quenching, tempering for solving the problems of the technologies described above H13 steel vacuum time-control quenching heat treatment technique of the present invention, the quenchant that the quenching behind the heat tracing is adopted is the salt solution that contains 5～10%NaCl, and the quench treatment time is 1～5 minute.

After described brine quenching was handled, preferably oil cooling was 6～8 minutes, takes out air cooling then, last temper.

Generally at carbon steel, can use salt solution in the low alloy steel as the heat-eliminating medium that quenches, and still do not use the precedent of salt solution in the H13 Heat Treatment Of Steel as quenching medium, because using salt solution according to common technical knowledge is to cause the H13 steel to handle the part rimose as quenchant, so in the H13 Heat Treatment Of Steel, generally ban use of, and the present invention has adopted special time-control quenching process means just, both avoided producing in the brine quenching rimose danger, improve the quenching quality again greatly, improved the impelling strength after the tempering of H13 steel effectively, thus the work-ing life of improving mould greatly.

Embodiment

The invention will be further described below in conjunction with specific embodiment:

Get 100 * 100 * 100 mm H, 13 steel samples in vacuum oven internal heating to 1050 ℃ insulation after 100 minutes, in stove, shift out and put the salt solution cold 1～5 minute, oil groove is put in taking-up in the salt solution, cools off 6～8 minutes fuel-displaced air coolings, is tempered at last to require in the durometer level.

Specific embodiment parameter value such as following table

Embodiment	The brine quenching time (unit: minute)	The oil cooling time (unit: minute)
Embodiment	The brine quenching time (unit: minute)	The oil cooling time (unit: minute)	1	1	8
2	2.5	6.5	1	1	8
2	2.5	6.5	3	3	6
4	4.5	7	3	3	6
4	4.5	7	5	5	6

Claims

1. a H13 steel vacuum time-control quenching heat treatment technique comprises heat tracing, quenching, tempering, it is characterized in that: the quenchant that described quenching behind heat tracing is adopted is the salt solution that contains 5～10%NaCl, and the quench treatment time is 1～5 minute.

2. H13 steel vacuum time-control quenching heat treatment technique according to claim 1 is characterized in that: after described brine quenching was handled, oil cooling 6～8 minutes took out air cooling then, last temper.