CN100404700C - Heat treatment process for raising comprehensive performace of low alloy structure steel - Google Patents
Heat treatment process for raising comprehensive performace of low alloy structure steel Download PDFInfo
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- CN100404700C CN100404700C CNB2005100368762A CN200510036876A CN100404700C CN 100404700 C CN100404700 C CN 100404700C CN B2005100368762 A CNB2005100368762 A CN B2005100368762A CN 200510036876 A CN200510036876 A CN 200510036876A CN 100404700 C CN100404700 C CN 100404700C
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Abstract
The present invention discloses a heat treatment technology for raising the comprehensive performance of low alloy structural steel. The technology comprises steps: (1) quenching: after an empty furnace is preheated to the temperature of 860 DEG C to 920 DEG C, and is stabilized for a period of time, and then, low alloy structural steel is put in the furnace. After being heated to the temperature of 860 DEG C to 920 DEG C., the low alloy structural steel preserves heat for a period of time, and the low alloy structural steel is immediately cooled by water to room temperature; (2) tempering: after the furnace is preheated to the temperature of 550 DEG C to 650 DEG C, the quenched low alloy structural steel is put in the furnace and heated to the temperature of 550 DEG C to 650 DEG C. After a period of time for heat preservation, the low alloy structural steel is taken out and cooled in the air. The heat treatment of low alloy structural steel Q 345 is carried out according to the technology of the present invention. The mechanical property of the low alloy structural steel is obvious improved, the intensity of tension is greater than 510MPa, the yield strength Rp0.2 is larger than 450Mpa, the impact value (20 degrees below zero of the Charpy impact value) is greater than 70 J, and the elongation delta 5 (%) is greater than 20. Compared with the existing heat treatment technology, the yield strength is improved by more than 30%, the impact value is improved by more than 50%, the present invention is used for manufacturing parts having high strength and high fatigue strength, such as an automobile shaft pipe, and other important parts.
Description
Technical field
The present invention relates to a kind of heat treating method of structure iron, refer in particular to the axletree bloster pipe of vehicles such as being used for trailer, cargo vehicle, engineering machinery, mining machinery and a kind of thermal treatment process that improves structural low Q345 over-all properties of other important spare part production.
Background technology
Structural low Q345 (old standard: 16Mn, 12MnV, 14MnNb, 16MnRE, 18Nb) is domestic generally to be used under hot rolling, normalizing or as-annealed condition, and the mechanical property of materials is relatively low, the about 345MPa of material yield intensity.Its chemical ingredients and mechanical property such as table 1, table 2:
The chemical ingredients % (GB/T1591-1994) of table 1 structural low Q345:
The mechanical property (as-normalized condition) of table 2 structural low Q345 is (GB/T1591-1994):
The bloster pipe of axletree etc. belongs to the important spare part of vehicles such as trailer, cargo vehicle, engineering machinery, mining machinery, in transportation, 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, be the structural low of producing at domestic prior art level, its mechanical property can not satisfy the deficiency that is used to make the mechanical component that bear high strength high tired work-ing life, provide a kind of and can significantly improve structural low Q345 over-all properties, be used for a kind of thermal treatment process that improves comprehensive performace of low alloy structure steel of the production of the axletree bloster pipe of vehicles such as trailer, cargo vehicle, engineering machinery, mining machinery and other important spare part.
The object of the present invention is achieved like this: a kind of thermal treatment process that improves structural low Q345 over-all properties comprises following processing step:
(1) quench: empty stove stablize for some time after being preheating to 880 ℃～920 ℃, then structural low is put into stove, be incubated for some time after being heated to 880 ℃～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.
Quench in above-mentioned a kind of thermal treatment process that improves structural low Q345 over-all properties and tempering time is no more than 60 minutes at interval.
In above-mentioned a kind of thermal treatment process that improves structural low Q345 over-all properties in the step (1) furnace temperature be raised to steady time after 880 ℃～920 ℃ with 20～60 minutes for good.
In above-mentioned a kind of thermal treatment process that improves structural low Q345 over-all properties in the step (1) Quenching Soaking Time of structural low be 40～50 minutes.
In above-mentioned a kind of thermal treatment process that improves structural low Q345 over-all properties in the step (2) tempering insulation time of structural low be 50～60 minutes.
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, greater than 70J, unit elongation δ 5 (%) is greater than 20 for impact value (20 degree Charpy impact value).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, waits important spare part as an Automobile shaft axle pipe.
Embodiment
Below in conjunction with specific embodiment the present invention is described in further detail, but does not constitute any limitation of the invention.
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 structural low Q345 over-all properties is characterized in that comprising following processing step:
(1) quench: empty stove stablize for some time after being preheating to 880 ℃～920 ℃, then structural low is put into stove, be incubated for some time after being heated to 880 ℃～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. a kind of thermal treatment process that improves structural low Q345 over-all properties according to claim 1 is characterized in that quenching and tempering time is no more than 60 minutes at interval.
3. a kind of thermal treatment process that improves structural low Q345 over-all properties according to claim 1 is characterized in that be 20～60 minutes the steady time that furnace temperature is raised to after 880 ℃～920 ℃ in the step (1).
4. a kind of thermal treatment process that improves structural low Q345 over-all properties according to claim 1 is characterized in that step (1) structural low Quenching Soaking Time 40～50 minutes.
5. a kind of thermal treatment process that improves structural low Q345 over-all properties according to claim 1 is characterized in that the structural low tempering insulation time is 50～60 minutes in the step (2).
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101812635B (en) * | 2010-04-28 | 2011-12-07 | 南京钢铁股份有限公司 | Class Q345F steel sheet with thickness of 80mm and manufacturing method thereof |
| CN101857914B (en) * | 2010-05-24 | 2012-02-08 | 清华大学 | Heat treatment method for materials of 25CrMo alloy steel hollow car axle for high-speed railway passenger trains |
| CN102041360A (en) * | 2010-12-21 | 2011-05-04 | 南阳汉冶特钢有限公司 | Heat treatment process for improving comprehensive performance of Q345 low alloy structural 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 |
| CN105838988B (en) * | 2016-06-07 | 2018-05-18 | 马鞍山钢铁股份有限公司 | The steel of axle of motor train unit containing niobium and its heat treatment process |
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