CN102041360A - Heat treatment process for improving comprehensive performance of Q345 low alloy structural steel - Google Patents
Heat treatment process for improving comprehensive performance of Q345 low alloy structural steel Download PDFInfo
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Abstract
The invention discloses a heat treatment process for improving the comprehensive performance of Q345 low alloy structural steel, which comprises the following process steps of: (1) quenching, namely preheating an empty furnace to the temperature of between 860 and 920 DEG C, stabilizing for a certain time, putting low alloy structural steel into the furnace, heating to the temperature of between 860 and 920 DEG C, preserving heat for a certain time, and immediately performing water cooling to room temperature; and (2) tempering, namely preheating the furnace to the temperature of between 550 and 650 DEG C, putting the quenched low alloy structural steel into the furnace, heating to the temperature of between 550 and 650 DEG C, preserving the heat for a certain time, taking out and cooling in air. Compared with the prior art, the heat treatment process has the advantage that: the mechanical properties of the steel are obviously improved, wherein the tensile strength is more than 510MPa, the yield strength Rp0.2 is more than 450MPa, the impact value is more than 70J, and the elongation deltas is more than 20. Compared with the conventional heat treatment technology, the heat treatment process improves the yield strength by over 30 percent and the impact value by over 50 percent, so the heat treatment process can be used for manufacturing parts which have high strength and fatigue strength.
Description
Technical field
The present invention relates to a kind of heat treating method of structure iron, be specifically related to a kind of thermal treatment process of the Q345 of raising comprehensive performace of low alloy structure steel, refer in particular to and be used for trailer, cargo vehicle, engineering machinery, the axletree bloster pipe of vehicles such as mining machinery and the structural low of other important spare parts.
Background technology
Q345 structural low is domestic generally in hot rolling, uses under normalizing or the as-annealed condition, and the mechanical property of materials is relatively low, the about 345MPa of material yield intensity.Its chemical property and mechanics composition such as table 1, shown in the table 2:
The chemical ingredients %(GB/T1591-1994 of table 1 Q345 structural low):
The mechanical property (as-normalized condition) of table 2 Q345 structural low is (GB/T1591-1994):
Trailer, cargo vehicle, engineering machinery, the bloster pipe of vehicle axletrees such as mining machinery is as important spare part, generally be by the manufacturing of Q345 structural low, in operational process, require to bear heavy duty, shock and vibration, require tension, bending resistance, twisting strength height, and fatigue strength height, fatigue lifetime are long.Thereby do not pass through the structural low of special thermal treatment technology, can not satisfy service requirements.
Summary of the invention
Purpose of the present invention provides a kind of over-all properties thermal treatment process that can significantly improve Q345 structural low, at the structural low that domestic prior art level is produced, its mechanical property can not satisfy to be used to make bears the high strength mechanical component in high tired work-ing life.
The object of the present invention is achieved like this: a kind of thermal treatment process that improves comprehensive performace of low alloy structure steel comprises following processing step:
(1) quench: empty stove stablize for some time after being preheating to 860 ℃ ~ 920 ℃, then structural low is put into stove, be incubated for some time after being heated to 860 ℃ ~ 920 ℃ after, water-cooled is to room temperature immediately;
(2) tempering: after furnace temperature is preheating to 550 ℃ ~ 650 ℃, will puts into stove through the structural low that quenches and be heated to 550 ℃ ~ 650 ℃, and take out after insulation for some time and in air, cool off.
Quenching and tempering time are no more than 60 minutes at interval in the above-mentioned thermal treatment process.
Be good with 20 ~ 60 minutes the steady time that the middle furnace temperature of above-mentioned thermal treatment process step (1) is raised to after 860 ℃ ~ 920 ℃.
The Quenching Soaking Time of structural low is 40 ~ 50 minutes in the above-mentioned thermal treatment process step (1).
The tempering insulation time of structural low is 40 ~ 50 minutes in the above-mentioned thermal treatment process step (2).
Technology of the present invention compared with prior art, has following advantage: structural low Q345 is heat-treated by thermal treatment process of the present invention, its mechanical property significantly improves, tensile strength is greater than 510MPa, yield strength Rp0.2 is greater than 450MPa, impact value (20 degree Charpy impact value) is greater than 70J, unit elongation δ
s(%) greater than 20.Compare with existing heat treatment technics, yield strength improves more than 30%, and impact value improves more than 50%, thereby can be used for making the part that requires to have high strength, high-fatigue strength, as important spare parts such as Automobile shaft bloster pipes.
Embodiment
The present invention is described in further detail below in conjunction with specific embodiment, but do not constitute any limitation of the invention.
The thermal treatment process of raising comprehensive performace of low alloy structure steel of the present invention comprises following processing step:
(1) quench: empty stove stablize for some time after being preheating to 860 ℃ ~ 920 ℃, then structural low is put into stove, be incubated for some time after being heated to 860 ℃ ~ 920 ℃ after, water-cooled is to room temperature immediately;
(2) tempering: after furnace temperature is preheating to 550 ℃ ~ 650 ℃, will puts into stove through the structural low that quenches and be heated to 550 ℃ ~ 650 ℃, and take out after insulation for some time and in air, cool off.
Quenching and tempering time are no more than 60 minutes at interval in the above-mentioned thermal treatment process.
Be good with 20 ~ 60 minutes the steady time that the middle furnace temperature of above-mentioned thermal treatment process step (1) is raised to after 860 ℃ ~ 920 ℃.
The Quenching Soaking Time of structural low is 40 ~ 50 minutes in the above-mentioned thermal treatment process step (1).
The tempering insulation time of structural low is 40 ~ 50 minutes in the above-mentioned thermal treatment process step (2).
Embodiment 1
1. material: structural low Q345 tubing
2. thermal treatment process: quench (1): after stablizing 40 minutes after empty stove is preheating to 860 ℃, structural low is put into stove, be heated to 860 ℃ after insulation 40 minutes, water-cooled is to room temperature immediately; (2) tempering: after furnace temperature is preheating to 580 ℃, will put into stove internal heating to 580 ℃ through the structural low that quenches, and be incubated to take out after 50 minutes and cool off in air, quenching and tempering time are no more than 60 minutes at interval.Performance test data sees Table 3.
Embodiment 2
1. material: structural low Q345 tubing
2. thermal treatment process: quench (1): after stablizing 40 minutes after empty stove is preheating to 880 ℃, structural low is put into stove, be heated to 880 ℃ after insulation 40 minutes, water-cooled is to room temperature immediately; (2) tempering: after furnace temperature is preheating to 570 ℃, will put into stove internal heating to 570 ℃ through the structural low that quenches, and be incubated to take out after 50 minutes and cool off in air, quenching and tempering time are no more than 60 minutes at interval.Performance test data sees Table 3.
Embodiment 3
1. material: structural low Q345 tubing
2. thermal treatment process: quench (1): after stablizing 40 minutes after empty stove is preheating to 900 ℃, structural low is put into stove, be heated to 900 ℃ after insulation 40 minutes, water-cooled is to room temperature immediately; (2) tempering: after furnace temperature is preheating to 620 ℃, will put into stove internal heating to 620 ℃ through the structural low that quenches, and be incubated to take out after 50 minutes and cool off in air, quenching and tempering time are no more than 60 minutes at interval.Performance test data sees Table 3.
Embodiment 4
1. material: structural low Q345 tubing
2. thermal treatment process: quench (1): after stablizing 40 minutes after empty stove is preheating to 920 ℃, structural low is put into stove, be heated to 920 ℃ after insulation 40 minutes, water-cooled is to room temperature immediately; (2) tempering: after furnace temperature is preheating to 580 ℃, will put into stove internal heating to 580 ℃ through the structural low that quenches, and be incubated to take out after 50 minutes and cool off in air, quenching and tempering time are no more than 60 minutes at interval.Performance test data sees Table 3.
Embodiment 5
1. material: structural low Q345 tubing
2. thermal treatment process: quench (1): after stablizing 45 minutes after empty stove is preheating to 870 ℃, structural low is put into stove, be heated to 870 ℃ after insulation 45 minutes, water-cooled is to room temperature immediately; (2) tempering: after furnace temperature is preheating to 600 ℃, will put into stove internal heating to 600 ℃ through the structural low that quenches, and be incubated to take out after 55 minutes and cool off in air, quenching and tempering time are no more than 60 minutes at interval.Performance test data sees Table 3.
Embodiment 6
1. material: structural low Q345 tubing
2. thermal treatment process: quench (1): after stablizing 45 minutes after empty stove is preheating to 880 ℃, structural low is put into stove, be heated to 880 ℃ after insulation 45 minutes, water-cooled is to room temperature immediately; (2) tempering: after furnace temperature is preheating to 590 ℃, will put into stove internal heating to 590 ℃ through the structural low that quenches, and be incubated to take out after 50 minutes and cool off in air, quenching and tempering time are no more than 60 minutes at interval.Performance test data sees Table 3.
Embodiment 7
1. material: structural low Q345 tubing
2. thermal treatment process: quench (1): after stablizing 45 minutes after empty stove is preheating to 890 ℃, structural low is put into stove, be heated to 890 ℃ after insulation 45 minutes, water-cooled is to room temperature immediately; (2) tempering: after furnace temperature is preheating to 590 ℃, will put into stove internal heating to 590 ℃ through the structural low that quenches, and be incubated to take out after 60 minutes and cool off in air, quenching and tempering time are no more than 60 minutes at interval.Performance test data sees Table 3.
Embodiment 8
1. material: structural low Q345 tubing
2. thermal treatment process: quench (1): after stablizing 50 minutes after empty stove is preheating to 900 ℃, structural low is put into stove, be heated to 900 ℃ after insulation 50 minutes, water-cooled is to room temperature immediately; (2) tempering: after furnace temperature is preheating to 600 ℃, will put into stove internal heating to 600 ℃ through the structural low that quenches, and be incubated to take out after 55 minutes and cool off in air, quenching and tempering time are no more than 60 minutes at interval.Performance test data sees Table 3.
Embodiment 9
1. material: structural low Q345 tubing
2. thermal treatment process: quench (1): after stablizing 50 minutes after empty stove is preheating to 910 ℃, structural low is put into stove, be heated to 910 ℃ after insulation 50 minutes, water-cooled is to room temperature immediately; (2) tempering: after furnace temperature is preheating to 590 ℃, will put into stove internal heating to 590 ℃ through the structural low that quenches, and be incubated to take out after 60 minutes and cool off in air, quenching and tempering time are no more than 60 minutes at interval.Performance test data sees Table 3.
Embodiment 10
1. material: structural low Q345 tubing
2. thermal treatment process: quench (1): after stablizing 48 minutes after empty stove is preheating to 900 ℃, structural low is put into stove, be heated to 900 ℃ after insulation 48 minutes, water-cooled is to room temperature immediately; (2) tempering: after furnace temperature is preheating to 600 ℃, will put into stove internal heating to 600 ℃ through the structural low that quenches, and be incubated to take out after 60 minutes and cool off in air, quenching and tempering time are no more than 60 minutes at interval.Performance test data sees Table 3.
Each embodiment performance test data of table 3
Claims (5)
1. thermal treatment process that improves the Q345 comprehensive performace of low alloy structure steel, this thermal treatment process comprises following processing step:
(1), quench: empty stove stablize for some time after being preheating to 860 ℃ ~ 920 ℃, then structural low is put into stove, be incubated for some time after being heated to 860 ℃ ~ 920 ℃ after, water-cooled is to room temperature immediately;
(2), tempering: after furnace temperature is preheating to 550 ℃ ~ 650 ℃, will puts into stove through the structural low that quenches and be heated to 550 ℃ ~ 650 ℃, and take out after insulation for some time and in air, cool off.
2. according to the thermal treatment process of the described raising of claim 1 Q345 comprehensive performace of low alloy structure steel, it is characterized in that quenching in the above-mentioned thermal treatment process and tempering time is no more than 60 minutes at interval.
3. according to the thermal treatment process of claim 1 or 2 described raising Q345 comprehensive performace of low alloy structure steel, it is characterized in that be good with 20 ~ 60 minutes the steady time that furnace temperature is raised to after 860 ℃ ~ 920 ℃ in the above-mentioned thermal treatment process step (1).
4. according to the thermal treatment process of the described raising of claim 3 Q345 comprehensive performace of low alloy structure steel, it is characterized in that the Quenching Soaking Time of structural low in the above-mentioned thermal treatment process step (1) is 40 ~ 50 minutes.
5. according to the thermal treatment process of the described raising of claim 4 Q345 comprehensive performace of low alloy structure steel, it is characterized in that the tempering insulation time of structural low in the above-mentioned thermal treatment process step (2) is 40 ~ 50 minutes.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103643012A (en) * | 2013-12-19 | 2014-03-19 | 马钢(集团)控股有限公司 | Enhanced heat treatment testing method for steel |
| CN103710498A (en) * | 2014-01-03 | 2014-04-09 | 河北路友铁路机车车辆配件有限公司 | Heat treatment technology for forging coupler yoke |
| CN111424161A (en) * | 2020-03-17 | 2020-07-17 | 中北大学 | Heat treatment method for improving and stabilizing elongation of iron-chromium-aluminum wire |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1810997A (en) * | 2005-08-30 | 2006-08-02 | Bpw(梅州）车轴有限公司 | Heat treatment process for raising comprehensive performace of low alloy structure steel |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1810997A (en) * | 2005-08-30 | 2006-08-02 | Bpw(梅州）车轴有限公司 | Heat treatment process for raising comprehensive performace of low alloy structure steel |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103643012A (en) * | 2013-12-19 | 2014-03-19 | 马钢(集团)控股有限公司 | Enhanced heat treatment testing method for steel |
| CN103643012B (en) * | 2013-12-19 | 2015-10-07 | 马钢(集团)控股有限公司 | A kind of strengthen connotation test method of steel |
| CN103710498A (en) * | 2014-01-03 | 2014-04-09 | 河北路友铁路机车车辆配件有限公司 | Heat treatment technology for forging coupler yoke |
| CN111424161A (en) * | 2020-03-17 | 2020-07-17 | 中北大学 | Heat treatment method for improving and stabilizing elongation of iron-chromium-aluminum wire |
| CN111424161B (en) * | 2020-03-17 | 2022-01-28 | 中北大学 | Heat treatment method for improving and stabilizing elongation of iron-chromium-aluminum wire |
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Application publication date: 20110504 |