CN105714027A - Heat treatment process for hardening and tempering of 45 steel - Google Patents
Heat treatment process for hardening and tempering of 45 steel Download PDFInfo
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- CN105714027A CN105714027A CN201410723778.5A CN201410723778A CN105714027A CN 105714027 A CN105714027 A CN 105714027A CN 201410723778 A CN201410723778 A CN 201410723778A CN 105714027 A CN105714027 A CN 105714027A
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Abstract
The invention discloses a heat treatment process for hardening and tempering of 45 steel. According to the heat treatment process, 1) it is inappropriate to apply the heat treatment process to a 45 steel workpiece with a large cross section size and high requirements; 2) the quenching temperature for 45 steel is in a range of A3 + (30-50) DEG C; 3) since 45 steel has low hardenability, a 10% saline solution with a larger cooling velocity should be adopted; 4) the hardness of a hardened and tempered 45 steel workpiece should reach HRC56-59 after quenching; and 5) as for high temperature tempering of 45 steel after quenching, heating temperature is normally 560 to 600 DEG C and hardness is required to be HRC22-34. Parameter collocation of the heat treatment process is reasonable and coordinated, so production efficiency can be effectively improved.
Description
Technical field
The present invention relates to the Technology for Heating Processing that a kind of 45 steel are modified.
Background technology
The modified Technology for Heating Processing of existing 45 steel exists that procedure arrangement is unreasonable, operation is various, technological parameter selects unreasonable, the collocation of each technological parameter is unreasonable and operator's skill requirement is higher so that production cost is higher, product quality is on the low side, yield rate is not high.
Summary of the invention
Because the drawbacks described above of prior art, the technical problem to be solved is to provide the Technology for Heating Processing that a kind of operation 45 steel reasonable, low cost of manufacture are modified.
For achieving the above object, the invention provides
The Technology for Heating Processing that a kind of 45 steel are modified, comprises the steps:
1), the sectional dimension of 45 steel greatly and requires that higher workpiece should not adopt.
2), 45 steel hardening heats are in A3+(30 ~ 50) DEG C.Higher hardening heat can make workpiece heat speed accelerate, and surface oxidation reduces, and can improve work efficiency.For making the austenite homogenization of workpiece, it is necessary to enough temperature retention times.If actual batch is big, just need proper extension temperature retention time.Not so, it is possible to there will be because heating the uneven phenomenon causing hardness not enough.But temperature retention time is long, coarse grains, the disadvantage that oxidation and decarbonization is serious, impact quenching quality also can also occur.If batch is more than the regulation of technical papers, the heating and thermal insulation time need to extend 1/5.
3), because 45 steel hardenabilities are low, therefore 10% saline solution that rate of cooling is big should be adopted.After workpiece enters water, it should through hardening, but it not cold, if workpiece is cold in saline, it is possible to make workpiece ftracture, this is because when about work-piece cools to 180 DEG C time, austenite is changed into rapidly martensite to be caused caused by excessive structural stress.Therefore, when quenching workpiece is as cold as this temperature province soon, the method that just should take slow cooling.Owing to leaving water temperature is difficult to grasp, must operate by rule of thumb, shake when the workpiece in water and stop, water-air cooling (if oil cooling is better) can be gone out.Should move unsuitable quiet it addition, workpiece enters water, according to the geometry of workpiece, regular motion should be made.Static cooling medium, plus static workpiece, causes that hardness is uneven, Stress non-homogeneity and make workpiece deformation big, even ftracture.
4), the hardness after the 45 modified part quenchings of steel should reach HRC56 ~ 59, the big probability in cross section is lower, but cannot be below HRC48, not so, just illustrating that workpiece is quenched completely, is likely to occur sorbite even ferritic structure in tissue, this tissue passes through tempering, remain in matrix, do not reach modified purpose.
5) high tempering, after 45 steel quenchings, heating-up temperature is generally 560 ~ 600 DEG C, and hardness requirement is HRC22 ~ 34. because modified purpose is to obtain comprehensive mechanical performance, so hardness range is relatively wide.But drawing have hardness requirement it is necessary to adjust temperature by drawing, to ensure hardness.As some axial workpiece desired strength is high, hardness requirement is just high；And some gear, axial workpiece with keyway, because being also performed to milling after modified, inserting processing, hardness requirement is just lower.
The invention has the beneficial effects as follows: operation of the present invention is reasonable, low cost of manufacture, each parameter collocation reasonable coordination, it is possible to be effectively improved product quality and production efficiency.
Detailed description of the invention
Below in conjunction with embodiment, the invention will be further described:
The Technology for Heating Processing that a kind of 45 steel are modified, comprises the steps:
1), the sectional dimension of 45 steel greatly and requires that higher workpiece should not adopt.
2), 45 steel hardening heats are in A3+(30 ~ 50) DEG C.Higher hardening heat can make workpiece heat speed accelerate, and surface oxidation reduces, and can improve work efficiency.For making the austenite homogenization of workpiece, it is necessary to enough temperature retention times.If actual batch is big, just need proper extension temperature retention time.Not so, it is possible to there will be because heating the uneven phenomenon causing hardness not enough.But temperature retention time is long, coarse grains, the disadvantage that oxidation and decarbonization is serious, impact quenching quality also can also occur.If batch is more than the regulation of technical papers, the heating and thermal insulation time need to extend 1/5.
3), because 45 steel hardenabilities are low, therefore 10% saline solution that rate of cooling is big should be adopted.After workpiece enters water, it should through hardening, but it not cold, if workpiece is cold in saline, it is possible to make workpiece ftracture, this is because when about work-piece cools to 180 DEG C time, austenite is changed into rapidly martensite to be caused caused by excessive structural stress.Therefore, when quenching workpiece is as cold as this temperature province soon, the method that just should take slow cooling.Owing to leaving water temperature is difficult to grasp, must operate by rule of thumb, shake when the workpiece in water and stop, water-air cooling (if oil cooling is better) can be gone out.Should move unsuitable quiet it addition, workpiece enters water, according to the geometry of workpiece, regular motion should be made.Static cooling medium, plus static workpiece, causes that hardness is uneven, Stress non-homogeneity and make workpiece deformation big, even ftracture.
4), the hardness after the 45 modified part quenchings of steel should reach HRC56 ~ 59, the big probability in cross section is lower, but cannot be below HRC48, not so, just illustrating that workpiece is quenched completely, is likely to occur sorbite even ferritic structure in tissue, this tissue passes through tempering, remain in matrix, do not reach modified purpose.
5) high tempering, after 45 steel quenchings, heating-up temperature is generally 560 ~ 600 DEG C, and hardness requirement is HRC22 ~ 34. because modified purpose is to obtain comprehensive mechanical performance, so hardness range is relatively wide.But drawing have hardness requirement it is necessary to adjust temperature by drawing, to ensure hardness.As some axial workpiece desired strength is high, hardness requirement is just high；And some gear, axial workpiece with keyway, because being also performed to milling after modified, inserting processing, hardness requirement is just lower.
Claims (1)
1. the Technology for Heating Processing that 45 steel are modified, is characterized in that: comprise the steps:
1), the sectional dimension of 45 steel greatly and requires that higher workpiece should not adopt；
2), 45 steel hardening heats are in A3+(30 ~ 50) DEG C；Higher hardening heat can make workpiece heat speed accelerate, and surface oxidation reduces, and can improve work efficiency；For making the austenite homogenization of workpiece, it is necessary to enough temperature retention times；If actual batch is big, just need proper extension temperature retention time；Not so, it is possible to there will be because heating the uneven phenomenon causing hardness not enough；If batch is more than the regulation of technical papers, the heating and thermal insulation time need to extend 1/5；
3), because 45 steel hardenabilities are low, therefore 10% saline solution that rate of cooling is big should be adopted；After workpiece enters water, it should through hardening, but it not cold, if workpiece is cold in saline, it is possible to make workpiece ftracture, this is because when about work-piece cools to 180 DEG C time, austenite is changed into rapidly martensite to be caused caused by excessive structural stress；Therefore, when quenching workpiece is as cold as this temperature province soon, the method that just should take slow cooling；Owing to leaving water temperature is difficult to grasp, must operate by rule of thumb, shake when the workpiece in water and stop, water-air cooling (if oil cooling is better) can be gone out；Should move unsuitable quiet it addition, workpiece enters water, according to the geometry of workpiece, regular motion should be made；Static cooling medium, plus static workpiece, causes that hardness is uneven, Stress non-homogeneity and make workpiece deformation big, even ftracture；
4), the hardness after the 45 modified part quenchings of steel should reach HRC56 ~ 59, the big probability in cross section is lower, but cannot be below HRC48, not so, just illustrating that workpiece is quenched completely, is likely to occur sorbite even ferritic structure in tissue, this tissue passes through tempering, remain in matrix, do not reach modified purpose；
5) high tempering, after 45 steel quenchings, heating-up temperature is generally 560 ~ 600 DEG C, and hardness requirement is HRC22 ~ 34. because modified purpose is to obtain comprehensive mechanical performance, so hardness range is relatively wide；But drawing have hardness requirement it is necessary to adjust temperature by drawing, to ensure hardness；As some axial workpiece desired strength is high, hardness requirement is just high；And some gear, axial workpiece with keyway, because being also performed to milling after modified, inserting processing, hardness requirement is just lower.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410723778.5A CN105714027A (en) | 2014-12-04 | 2014-12-04 | Heat treatment process for hardening and tempering of 45 steel |
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| CN201410723778.5A CN105714027A (en) | 2014-12-04 | 2014-12-04 | Heat treatment process for hardening and tempering of 45 steel |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106065427A (en) * | 2016-08-02 | 2016-11-02 | 中车资阳机车有限公司 | A kind of hardening and tempering process of railway locomotive derailing support shaft |
| CN106929638A (en) * | 2017-04-24 | 2017-07-07 | 上海交通大学 | A kind of use hot water as cooling medium cleaning grade quench method |
| CN109759785A (en) * | 2019-01-09 | 2019-05-17 | 安徽鼎宏胶辊有限公司 | A kind of preparation method of high strength steel roller shaft head |
| CN111004894A (en) * | 2019-12-27 | 2020-04-14 | 大连德迈仕精密科技股份有限公司 | Processing technology for uniform and stable quenching hardness of No. 45 high-quality carbon structural steel |
| CN111876562A (en) * | 2020-08-06 | 2020-11-03 | 湖南泰安锻造有限公司 | Water quenching oil cooling treatment method for heat treatment production line |
-
2014
- 2014-12-04 CN CN201410723778.5A patent/CN105714027A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106065427A (en) * | 2016-08-02 | 2016-11-02 | 中车资阳机车有限公司 | A kind of hardening and tempering process of railway locomotive derailing support shaft |
| CN106929638A (en) * | 2017-04-24 | 2017-07-07 | 上海交通大学 | A kind of use hot water as cooling medium cleaning grade quench method |
| CN106929638B (en) * | 2017-04-24 | 2018-11-16 | 上海交通大学 | A kind of cleaning grade quench method for using hot water as cooling medium |
| CN109759785A (en) * | 2019-01-09 | 2019-05-17 | 安徽鼎宏胶辊有限公司 | A kind of preparation method of high strength steel roller shaft head |
| CN111004894A (en) * | 2019-12-27 | 2020-04-14 | 大连德迈仕精密科技股份有限公司 | Processing technology for uniform and stable quenching hardness of No. 45 high-quality carbon structural steel |
| CN111876562A (en) * | 2020-08-06 | 2020-11-03 | 湖南泰安锻造有限公司 | Water quenching oil cooling treatment method for heat treatment production line |
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Application publication date: 20160629 |
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