CN1492059A - Strong magnetic field quick complete annealing process for medium carbon low alloy structure steel - Google Patents
Strong magnetic field quick complete annealing process for medium carbon low alloy structure steel Download PDFInfo
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- CN1492059A CN1492059A CNA021332711A CN02133271A CN1492059A CN 1492059 A CN1492059 A CN 1492059A CN A021332711 A CNA021332711 A CN A021332711A CN 02133271 A CN02133271 A CN 02133271A CN 1492059 A CN1492059 A CN 1492059A
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Abstract
The present invention relates to the quick annealing process of medium carbon low alloy structure steel in strong magnetic field. After the material is heated to required heat treating temperature, one constant magnetic field of strength 10-14 tesla and produced by a annular superconductive strong magnet is applied; the magnetic field is maintained while maintaining the heat treating temperature and cooling in the rate of 40-50 deg.c/min until 550-650 deg.c; and the magnetic field strength is reduced gradually to zero and the steel is discharged for air cooling. The present invention has cooling rate as high as 40-50 times that of traditional method and thus raised production efficiency. The treated material has fine structure of mixed randomly and homogeneously distributed ferrite and pearlite and strength in optimal cutting range. In addition, there is no belt structure in the completely annealed material resulting in improved cutting performance.
Description
Affiliated technical field
The conditioning heat treatment processing method of carbon and low-alloy structural steel in the present invention relates to, carbon and low-alloy structural steel quick complete annealing process for medium under magnetic field condition in specifically relating to.
Background technology
Middle carbon and low-alloy structural steel is used for making the important structure part of work under the high loading, as gear, bent axle, connecting rod, fastening piece etc. more.These parts adopt the forging method base mostly, and Widmannstatten structure can appear in the material structure after forging, tissue defects such as crystal grain is thick, and material hardness is higher.Therefore, before machining, usually adopt dead annealed method, improve material internal tissue, eliminate stress, reduce hardness to improve the machinability of material, be follow-up heat treatment process preparation favorable tissue condition.Cutting hardness scope for middle carbon and low-alloy structural steel the best is HB160～230; Require grain-size after the conditioning heat treatment below 20 μ m.The Full Annealing technology of existing centering carbon and low-alloy structural steel now is that material is heated, in stove, slowly cool to below 550 ℃ behind the austenitizing and come out of the stove, the cold speed of cooling of stove is about 1 ℃/min, and be that the production cycle is longer about 5hr cooling time in the general stove.
In addition, if the supply status of material is the hot rolling attitude, so this material then is very easy to produce banded structure owing to produce nonaffine deformation and component segregation in course of hot rolling after the Full Annealing.For this reason, need to adopt normalizing to eliminate banded structure, utilize high tempering to reduce hardness again, improve machinability.This technology is numerous and diverse, and it is many to produce heat.
Summary of the invention
The objective of the invention is to overcome the defective in the above-mentioned known technology, a kind of magnetic field quick complete annealing process for medium is provided, can make organizing of middle carbon and low-alloy structural steel tiny, even, hardness is moderate, improves material structure and cutting technology performance; Reach simultaneously greatly to shorten and account for the stove time, boost productivity.
Technical solution of the present invention is: at first with selected materials at the heat treatment furnace internal heating after thermal treatment temp, begin to apply the permanent magnetic field that intensity is 10～14 teslas, insulation under this magnetic field condition, cooling, soaking time is that benchmark calculates with the material thickness, speed of cooling is 40～50 ℃/min, fall magnetic field when being cooled to 650～550 ℃, magnetic field is that zero back material is come out of the stove.
Above-mentioned material heat treatment temperature is Ac3+50～110 ℃; High-intensity magnetic field is produced by ring-type superconduction kicker magnet, and heat treatment furnace is placed among the high-intensity magnetic field, and heat treatment material is placed in the central position of high-intensity magnetic field; Soaking time under the magnetic field condition is calculated as follows: 2～10min/mm.
The present invention compared to the prior art, its significant advantage and effect are:
1,40～45 ℃/min of speed of cooling that adopts of present method is 40～50 times of 1 ℃/min of traditional method speed of cooling, therefore can significantly shorten accounting for the stove time, boosts productivity;
2, the obvious refinement of material inside organization after present method is handled, it is organized as equally distributed ferrite and perlite, and ferritic average grain size is less than 15 μ m, and the ferrite grain size of traditional Full Annealing tissue is about 25 μ m.
3, the material inside organization after present method is handled is even, has avoided occurring after the Full Annealing of hot rolling raw material tissue defects such as banded structure.
4, the middle carbon and low-alloy structural steel hardness of handling through present method is HB167～210, in the optimized cutting durometer level.
Embodiment
Example 1, choose the 42CrMo hot-finished material, in heat treatment furnace, heat, when thermal treatment temp reaches 880 ± 5 ℃, begin to apply the permanent magnetic field that intensity is 14 teslas, and be incubated half an hour, cooling then, speed of cooling is 46/min, falls magnetic field when being cooled to 550 ℃, after magnetic field is zero, with the workpiece air cooling of coming out of the stove.Material microstructure after handling through present method still is made up of ferrite and perlite, and wherein ferrite and perlite such as are at a shape and uniform distribution, and ferritic average grain size is 10um, and area percent is 23.1%; The hardness of this tissue is HB192～210, is in the optimized cutting durometer level.
Example 2, choose the 30GMnTi hot-finished material, in heat treatment furnace, heat, when thermal treatment temp reaches 885 ± 5 ℃, begin to apply the permanent magnetic field that intensity is 12 teslas, and insulation 25min, Full Annealing cooling then, speed of cooling is 43 ℃/min, falls magnetic field when being cooled to 600 ℃, after magnetic field is zero, with the workpiece air cooling of coming out of the stove.Material microstructure after handling through present method still is made up of ferrite and perlite, and wherein ferrite and perlite such as are at a shape and uniform distribution, and ferritic average grain size is 7.6 μ m, and area percent is 43.22%; The hardness of this tissue is HB167～187, is in the optimized cutting durometer level.
Claims (5)
1, a kind of middle strong magnetic field quick complete annealing process for medium carbon low alloy structure steel, comprise intensification, insulation, cooling, it is characterized in that at first selected materials being placed the heat treatment furnace internal heating after thermal treatment temp, begin to apply the strong permanent magnetic field that intensity is 10～14 teslas, insulation under this magnetic field, cooling, soaking time is that benchmark calculates with the thickness of material, speed of cooling is 40～50 ℃/min, magnetic field falls when being cooled to 650～550 ℃, the air cooling of coming out of the stove when magnetic field is zero.
2, according to claim 1 described in strong magnetic field quick complete annealing process for medium carbon low alloy structure steel, it is characterized in that the material hot treatment temperature is Ac3+50～110 ℃.
3, according to the described middle strong magnetic field quick complete annealing process for medium carbon low alloy structure steel of claim 1, the high-intensity magnetic field that applies when it is characterized in that thermal treatment is to be produced by ring-type superconduction kicker magnet.
4, according to the described middle strong magnetic field quick complete annealing process for medium carbon low alloy structure steel of claim 1, it is characterized in that heat treatment furnace places the central position of high-intensity magnetic field.
5, according to the described middle strong magnetic field quick complete annealing process for medium carbon low alloy structure steel of claim 1, it is characterized in that the soaking time under the magnetic field condition is to be that benchmark calculates with the material thickness, formula is 2～10min/mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02133271 CN1234882C (en) | 2002-10-25 | 2002-10-25 | Strong magnetic field quick complete annealing process for medium carbon low alloy structure steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02133271 CN1234882C (en) | 2002-10-25 | 2002-10-25 | Strong magnetic field quick complete annealing process for medium carbon low alloy structure steel |
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| Publication Number | Publication Date |
|---|---|
| CN1492059A true CN1492059A (en) | 2004-04-28 |
| CN1234882C CN1234882C (en) | 2006-01-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 02133271 Expired - Fee Related CN1234882C (en) | 2002-10-25 | 2002-10-25 | Strong magnetic field quick complete annealing process for medium carbon low alloy structure steel |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105478520A (en) * | 2015-12-15 | 2016-04-13 | 东北大学 | Method for manufacturing nanoscale multilayer metal matrix composite with combination of magnetic field heat treatment |
| CN111763806A (en) * | 2020-06-23 | 2020-10-13 | 江苏龙城精锻有限公司 | Low-temperature annealing magnetic heat treatment process for low-carbon steel |
| CN113957209A (en) * | 2021-09-07 | 2022-01-21 | 材谷金带(佛山)金属复合材料有限公司 | High-carbon chromium bearing steel high-intensity magnetic field rapid spheroidizing annealing process |
-
2002
- 2002-10-25 CN CN 02133271 patent/CN1234882C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105478520A (en) * | 2015-12-15 | 2016-04-13 | 东北大学 | Method for manufacturing nanoscale multilayer metal matrix composite with combination of magnetic field heat treatment |
| CN105478520B (en) * | 2015-12-15 | 2017-05-10 | 东北大学 | Method for manufacturing nanoscale multilayer metal matrix composite with combination of magnetic field heat treatment |
| CN111763806A (en) * | 2020-06-23 | 2020-10-13 | 江苏龙城精锻有限公司 | Low-temperature annealing magnetic heat treatment process for low-carbon steel |
| CN113957209A (en) * | 2021-09-07 | 2022-01-21 | 材谷金带(佛山)金属复合材料有限公司 | High-carbon chromium bearing steel high-intensity magnetic field rapid spheroidizing annealing process |
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| Publication number | Publication date |
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| CN1234882C (en) | 2006-01-04 |
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