CN103820608B - Heat treating method and the 35CrMnSi steel that temper brittleness improves toughness eliminated by 35CrMnSi steel - Google Patents
Heat treating method and the 35CrMnSi steel that temper brittleness improves toughness eliminated by 35CrMnSi steel Download PDFInfo
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- CN103820608B CN103820608B CN201210465197.7A CN201210465197A CN103820608B CN 103820608 B CN103820608 B CN 103820608B CN 201210465197 A CN201210465197 A CN 201210465197A CN 103820608 B CN103820608 B CN 103820608B
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Abstract
The present invention relates to forge piece technical field of heat treatment, particularly relate to a kind of be applicable to the 35CrMnSi steel of modifier treatment its temper brittleness of elimination and heat treating method and the 35CrMnSi steel that temper brittleness improves toughness eliminated by the 35CrMnSi steel that can improve its toughness, it comprises quenching, tempering, heating and thermal insulation, the step of cooling one row, comprehensive physical, the treatment technologies such as chemistry are in one, this ensure that the standard weave of 35CrMnSi steel changes insufficient, not exclusively, both temper brittleness was eliminated, turn improve the toughness of product, there is the quality that can improve product, reduction in the numbers of seconds, the resources of production are saved, reduce the production cost of enterprise, for eliminating the temper brittleness of 35CrMnSi steel, improve the advantage of 35CrMnSi steel toughness.
Description
Technical field
The present invention relates to forge piece technical field of heat treatment, particularly relate to a kind of be applicable to the 35CrMnSi steel of modifier treatment its temper brittleness of elimination and heat treating method and the 35CrMnSi steel that temper brittleness improves toughness eliminated by the 35CrMnSi steel that can improve its toughness.
Background technology
In actual production, for the forge piece of 35CrMnSi steel, often there is higher impelling strength requirement to it.But in existing production process, for the general hardening and tempering process of the forge piece of 35CrMnSi steel, all it requires that it is 450 ~ 650 DEG C of tempering.This tempering temperature is in the temper brittleness district of 35CrMnSi steel, such 35CrMnSi steel there will be the phenomenon that impact toughness fiercely declines, and temper brittleness is once be formed, very not easily eliminate, cause the Quality Down of product, defective, limit the application of this steel grade, the waste production means, add the production cost of enterprise.
Summary of the invention
The object of the invention is to overcome deficiency of the prior art and provide a kind of be applicable to the 35CrMnSi steel of modifier treatment its temper brittleness of elimination and heat treating method and the 35CrMnSi steel that temper brittleness improves toughness eliminated by the 35CrMnSi steel that can improve its toughness.
The object of the present invention is achieved like this:
The heat treating method that temper brittleness improves toughness eliminated by 35CrMnSi steel, it is characterized in that: it comprises the steps:
Step 1, quenching: quench treatment is carried out to 35CrMnSi steel;
Step 2, tempering: the 35CrMnSi steel after step 1 being quenched carries out tempering in the temperature range of 450 ~ 650 DEG C, tempering time calculates according to the every 100 millimeters of insulations of the free area of forging for 2 hours, and extending half the time, time sum must not be less than 4 hours simultaneously; Specific formula for calculation is: t=D/100 × 2 × 2, wherein t be tempering time, unit for hour, D is the free area of forging, unit is millimeter;
Step 3, heating and thermal insulation: 35CrMnSi steel step 3 tempering obtained is transferred in the heating environment of 650 ~ 700 DEG C and is incubated, until forging evenly reaches Heating temperature, the time that forging evenly reaches needed for Heating temperature is obtained by following formula: t=D/100 × α, wherein t be soaking time, unit for hour, D is the free area of forging, unit is millimeter, and α is heating coefficient, chooses 0.8 ~ 1.0;
Step 4, cooling: step 3 is incubated the 35CrMnSi steel obtained and comes out of the stove and adopt water-cooled or oil cooling mode to make its bulk temperature be cooled to less than 450 DEG C.
Described step 1 is carried out quench treatment to 35CrMnSi steel in quenching and specifically to be referred to 35CrMnSi steel, 860 ~ 960 DEG C of heating, then carry out water-cooled or oil cooling.
Tempering temperature concrete in described step 2 tempering is determined according to the concrete requirement of strength of 35CrMnSi steel.
35CrMnSi steel in described step 3 heating and thermal insulation, when shifting, ensure that the temperature fall that 35CrMnSi steel surface cool is located is the soonest no more than 50 DEG C.
In described step 3 heating and thermal insulation, 35CrMnSi steel is incubated in electric furnace.
A kind of 35CrMnSi steel, described 35CrMnSi steel is that the heat treating method improving toughness by eliminating temper brittleness obtains, and the heat treating method that temper brittleness raising toughness eliminated by this 35CrMnSi steel comprises the steps:
Step 1, quenching: quench treatment is carried out to 35CrMnSi steel;
Step 2, tempering: the 35CrMnSi steel after step 1 being quenched carries out tempering in the temperature range of 450 ~ 650 DEG C, tempering time calculates according to the every 100 millimeters of insulations of the free area of forging for 2 hours, and extending half the time, time sum must not be less than 4 hours simultaneously; Specific formula for calculation is: t=D/100 × 2 × 2, wherein t be tempering time, unit for hour, D is the free area of forging, unit is millimeter;
Step 3, heating and thermal insulation: 35CrMnSi steel step 3 tempering obtained is transferred in the heating environment of 650 ~ 700 DEG C and is incubated, until forging evenly reaches Heating temperature, the time that forging evenly reaches needed for Heating temperature is obtained by following formula: t=D/100 × α, wherein t be soaking time, unit for hour, D is the free area of forging, unit is millimeter, and α is heating coefficient, chooses 0.8 ~ 1.0;
Step 4, cooling: step 3 is incubated the 35CrMnSi steel obtained and comes out of the stove and adopt water-cooled or oil cooling mode to make its bulk temperature be cooled to less than 450 DEG C.
The present invention compared with prior art has following advantage:
1) 35CrMnSi steel of the present invention is eliminated temper brittleness and is improved the heat treating method of toughness and 35CrMnSi steel when carrying out modifier treatment, after normal quenching process terminates, tempering within the scope of 450 ~ 650 DEG C, the 35CrMnSi hardness of steel obtained like this is constant, and the toughness that impelling strength obtains than the outer tempering of 450 ~ 650 DEG C of scopes improves about 20 ~ 45J;
2) 35CrMnSi steel of the present invention is eliminated temper brittleness and is improved the heat treating method of toughness and the insulation of 35CrMnSi steel belt roof bolt in 650 ~ 700 DEG C, make use of 35CrMnSi steel like this when 650 ~ 700 DEG C of heating, the speed that temper brittleness is eliminated is much larger than the principle of the speed of strength degradation, be convenient to implement, this ensure that the standard weave of 35CrMnSi steel changes insufficient, not exclusively, thus obtain the intensity of needs, and then elimination temper brittleness, improve toughness;
3) heat treating method of the present invention is simple, be convenient to implement, the quality of product can be improved, reduction in the numbers of seconds, the resources of production are saved, reduce the production cost of enterprise, for eliminating the temper brittleness of 35CrMnSi steel, the toughness of raising 35CrMnSi steel provides practical measures, has very high social value meaning.
Accompanying drawing explanation
Heat treating method and the 35CrMnSi Heat Treatment Of Steel artwork that temper brittleness improves toughness eliminated by Fig. 1 35CrMnSi steel of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further illustrated.
Embodiment 1
The heat treating method that temper brittleness improves toughness eliminated by 35CrMnSi steel, and it comprises the steps:
Step 1, quenching: quench treatment is carried out to 35CrMnSi steel;
Step 2, tempering: the 35CrMnSi steel after step 1 being quenched carries out tempering in the temperature range of 450 ~ 650 DEG C, tempering time calculates according to the every 100 millimeters of insulations of the free area of forging for 2 hours, and extending half the time, time sum must not be less than 4 hours simultaneously; Specific formula for calculation is: t=D/100 × 2 × 2, wherein t be tempering time, unit for hour, D is the free area of forging, unit is millimeter;
Step 3, heating and thermal insulation: 35CrMnSi steel step 3 tempering obtained is transferred in the heating environment of 650 ~ 700 DEG C and is incubated, until forging evenly reaches Heating temperature, the time that forging evenly reaches needed for Heating temperature is obtained by following formula: t=D/100 × α, wherein t be soaking time, unit for hour, D is the free area of forging, unit is millimeter, and α is heating coefficient, chooses 0.8 ~ 1.0;
Step 4, cooling: step 3 is incubated the 35CrMnSi steel obtained and comes out of the stove and adopt water-cooled or oil cooling mode to make its bulk temperature be cooled to less than 450 DEG C.
Described step 1 is carried out quench treatment to 35CrMnSi steel in quenching and specifically to be referred to 35CrMnSi steel, 860 ~ 960 DEG C of heating, then carry out water-cooled or oil cooling.
Tempering temperature concrete in described step 2 tempering is determined according to the concrete requirement of strength of 35CrMnSi steel.
35CrMnSi steel in described step 3 heating and thermal insulation, when shifting, ensure that the temperature fall that 35CrMnSi steel surface cool is located is the soonest no more than 50 DEG C.
In described step 3 heating and thermal insulation, 35CrMnSi steel is incubated in electric furnace.
A kind of 35CrMnSi steel, described 35CrMnSi steel is that the heat treating method improving toughness by eliminating temper brittleness obtains, and the heat treating method that temper brittleness raising toughness eliminated by this 35CrMnSi steel comprises the steps:
Step 1, quenching: quench treatment is carried out to 35CrMnSi steel;
Step 2, tempering: the 35CrMnSi steel after step 1 being quenched carries out tempering in the temperature range of 450 ~ 650 DEG C, tempering time calculates according to the every 100 millimeters of insulations of the free area of forging for 2 hours, and extending half the time, time sum must not be less than 4 hours simultaneously; Specific formula for calculation is: t=D/100 × 2 × 2, wherein t be tempering time, unit for hour, D is the free area of forging, unit is millimeter;
Step 3, heating and thermal insulation: 35CrMnSi steel step 3 tempering obtained is transferred in the heating environment of 650 ~ 700 DEG C and is incubated, until forging evenly reaches Heating temperature, the time that forging evenly reaches needed for Heating temperature is obtained by following formula: t=D/100 × α, wherein t be soaking time, unit for hour, D is the free area of forging, unit is millimeter, and α is heating coefficient, chooses 0.8 ~ 1.0;
Step 4, cooling: step 3 is incubated the 35CrMnSi steel obtained and comes out of the stove and adopt water-cooled or oil cooling mode to make its bulk temperature be cooled to less than 450 DEG C.
Take diameter as the 35CrMnSi workpiece of φ 142mm be example, experiment proves, adopt the 35CrMnSi workpiece of the φ 142mm after process of the present invention, product tensile strength is being kept to be 1010MPa, when yield strength is greater than 830MPa, ballistic work is carried to 57J from before treatment lower than 32J, the results are shown in following table:
。
Claims (4)
1. the heat treating method that temper brittleness improves toughness eliminated by a 35CrMnSi steel, it is characterized in that: it comprises the steps: step 1, quenching: carry out quench treatment to 35CrMnSi steel, 35CrMnSi steel 860 ~ 960 DEG C of heating, is then carried out water-cooled or oil cooling by concrete finger, step 2, tempering: the 35CrMnSi steel after step 1 being quenched carries out tempering in the temperature range of 450 ~ 650 DEG C, tempering time calculates according to the every 100 millimeters of insulations of the free area of forging for 2 hours, and extending half the time, time sum must not be less than 4 hours simultaneously, specific formula for calculation is: t=D/100 × 2 × 2, wherein t be tempering time, unit for hour, D is the free area of forging, unit is millimeter, step 3, heating and thermal insulation: 35CrMnSi steel step 3 tempering obtained is transferred in the heating environment of 650 ~ 700 DEG C and is incubated, until forging evenly reaches Heating temperature, the time that forging evenly reaches needed for Heating temperature is obtained by following formula: t=D/100 × α, wherein t is soaking time, unit is hour, D is the free area of forging, unit is millimeter, α is heating coefficient, choose 0.8 ~ 1.0, 35CrMnSi steel in described step 3 heating and thermal insulation is when shifting, ensure that the temperature fall that 35CrMnSi steel surface cool is located is the soonest no more than 50 DEG C, step 4, cooling: step 3 is incubated the 35CrMnSi steel obtained and comes out of the stove and adopt water-cooled or oil cooling mode to make its bulk temperature be cooled to less than 450 DEG C.
2. the heat treating method that temper brittleness improves toughness eliminated by 35CrMnSi steel as claimed in claim 1, it is characterized in that: tempering temperature concrete in described step 2 tempering is determined according to the concrete requirement of strength of 35CrMnSi steel.
3. the heat treating method that temper brittleness improves toughness eliminated by 35CrMnSi steel as claimed in claim 1, it is characterized in that: in described step 3 heating and thermal insulation, 35CrMnSi steel is incubated in electric furnace.
4. a 35CrMnSi steel, it is characterized in that: described 35CrMnSi steel is that the heat treating method improving toughness by eliminating temper brittleness obtains, and the heat treating method that temper brittleness raising toughness eliminated by this 35CrMnSi steel comprises the steps: step 1, quenching: carry out quench treatment to 35CrMnSi steel; Step 2, tempering: the 35CrMnSi steel after step 1 being quenched carries out tempering in the temperature range of 450 ~ 650 DEG C, tempering time calculates according to the every 100 millimeters of insulations of the free area of forging for 2 hours, and extending half the time, time sum must not be less than 4 hours simultaneously; Specific formula for calculation is: t=D/100 × 2 × 2, wherein t be tempering time, unit for hour, D is the free area of forging, unit is millimeter; Step 3, heating and thermal insulation: 35CrMnSi steel step 3 tempering obtained is transferred in the heating environment of 650 ~ 700 DEG C and is incubated, until forging evenly reaches Heating temperature, the time that forging evenly reaches needed for Heating temperature is obtained by following formula: t=D/100 × α, wherein t be soaking time, unit for hour, D is the free area of forging, unit is millimeter, and α is heating coefficient, chooses 0.8 ~ 1.0; Step 4, cooling: step 3 is incubated the 35CrMnSi steel obtained and comes out of the stove and adopt water-cooled or oil cooling mode to make its bulk temperature be cooled to less than 450 DEG C.
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| CN114657332B (en) * | 2022-03-17 | 2024-03-29 | 湖南华菱涟源钢铁有限公司 | Quenched and tempered steel plate material and method for producing same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101392317A (en) * | 2008-10-17 | 2009-03-25 | 哈尔滨建成集团有限公司 | Heat treatment method of 35CrMnSiA alloy constructional steel |
| CN101435013A (en) * | 2008-12-26 | 2009-05-20 | 内蒙古北方重工业集团有限公司 | Preparation technique of flat shovel teeth material |
| CN101787420A (en) * | 2010-03-17 | 2010-07-28 | 上海大学 | Large-size mandril structure property control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101392317A (en) * | 2008-10-17 | 2009-03-25 | 哈尔滨建成集团有限公司 | Heat treatment method of 35CrMnSiA alloy constructional steel |
| CN101435013A (en) * | 2008-12-26 | 2009-05-20 | 内蒙古北方重工业集团有限公司 | Preparation technique of flat shovel teeth material |
| CN101787420A (en) * | 2010-03-17 | 2010-07-28 | 上海大学 | Large-size mandril structure property control method |
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Effective date of registration: 20180803 Address after: 459000 531 Industrial Park, Tiger Hill Industrial Cluster, Jiyuan City, Jiaozuo, Henan Patentee after: Henan Zhongyuan special steel equipment manufacturing Co., Ltd. Address before: 459008 Xiao Zhai village, Cheng Liu town, Jiyuan, Henan Patentee before: Zhongyuan Special Steel Co., Ltd. |