CN101768659B - Heat treatment technology of ultra-long mandrel - Google Patents
Heat treatment technology of ultra-long mandrel Download PDFInfo
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- CN101768659B CN101768659B CN2010101123566A CN201010112356A CN101768659B CN 101768659 B CN101768659 B CN 101768659B CN 2010101123566 A CN2010101123566 A CN 2010101123566A CN 201010112356 A CN201010112356 A CN 201010112356A CN 101768659 B CN101768659 B CN 101768659B
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Abstract
The invention discloses a heat treatment technology of an ultra-long mandrel used for a mandrel pipe mill, wherein the heat treatment characteristics of hot-work mould steel are considered according to the spot environment, the ultra-long mandrel adopts 4Cr5MoSiV1 steel (H13) as raw material, and the raw material is processed through forging, alignment, rough lathing with outside round surface and ultrasonic detection in turn and then is processed through heat treatment on a medium-frequency induction heating furnace. The heat treatment technology comprises the following steps: performing medium-frequency quenching once and tertiary medium-frequency tempering treatment three times. The beneficial effects of the medium-frequency heat treatment technology of the ultra-long mandrel are as follows: the technology is simple, the operation is convenient, the speed is fast, the oxidation and decarburization phenomenons are less, the material is saved; alignment is not needed to perform after the heat treatment, the production cost is low, the efficiency is high; the heating is uniform, the temperature difference on the surface of the mandrel is small, the temperature control accuracy is high, the four-quadrant hardness of the surface and the subsurface are uniform, the impact value can be increased by 10%, the cracking phenomena of the mandrel is delayed in use, the service life of the mandrel can be increased to twice of the common mandrel; and the technology is also applicable to the heat treatment of common floating mandrels and retained mandrels; and the energy consumption is low and pollution can not be caused to the environment.
Description
Technical field
The present invention relates to a kind of tandem rolling tube machine plug thermal treatment process, particularly a kind of heat treatment technology of ultra-long mandrel.
Background technology
In the operation of rolling of weldless steel tube, plug is the important tool on the tube rolling mill, except requiring material making with high strength and high-wearing feature, and also exigent surface quality.Plug is and the roll acting in conjunction pipe after the perforation to be rolled into the weldless steel tube of various size.Press steel pipe rolling mode difference, can be divided into floating core rod, half retained mandrel and retained mandrel.In the nearly stage, market causes also linearly growth of plug consumption on the milling train to the demand sustainable growth of weldless steel tube, and domestic consumption reaches 40000 tons every year.
The plug common used material is 4Cr5MoSiV1 steel (H13), it is a kind of hot-work die steel of middle carbon alloy air cooling sclerotic type, have better strength and toughness and cold-resistant thermal fatigue, be widely used in making medium-sized hammer forging die, medium and small mechanical press forging die, hot extruding die and plug and aluminium, magnesium alloy pressure-casting mould.
Plug regular size φ 76～φ 650mm, length 2000～12000mm.Common plug can be heat-treated in box-type furnace or well formula resistance furnace, but technology is complicated, long 2～3 days of heat treatment cycle, need to heat up for a long time, be incubated, must carry out oil quenching during quenching and handle, produce a large amount of dust and smog, the work on the spot environment is extremely abominable; And the yielding bending of workpiece after the thermal treatment must be carried out alignment, manufacturing cost height on the large-tonnage hydropress.
Tandem rolling tube machine is rolling oil production with the overlength retained mandrel and carries with the indispensable instrument of heavy caliber seamless steel pipe that its diameter is φ 107～φ 277mm, and length is 15～20 meters.Common box-type furnace, resistance pit furnace are because the space is limited, and thermal treatment can't be satisfied.The overlength retained mandrel is technical by force, difficulty is big owing to make, and has only the enterprise of France, Italy, German a few countries to produce in the world at present.The compo pipe corporate boss of domestic production heavy caliber seamless steel pipe will be from external import plug.Because the import plug costs an arm and a leg, delivery cycle is long, and imbalance between supply and demand is very outstanding.
Summary of the invention
The purpose of this invention is to provide a kind of Medium Frequency Induction Heating Furnace of utilizing, according to site environment, consider hot-work die Heat Treatment Of Steel characteristics, ultra-long mandrel is carried out primary quenching, three tempering process processing, it is low to make a kind of thermal treatment cost, technology is simple and easy to operate, has the good obdurability and the plug of cold-resistant thermal fatigue.
This heat treatment technology of ultra-long mandrel is to be raw material with 4Cr5MoSiV1 steel (H13), heat-treats on Medium Frequency Induction Heating Furnace, and its thermal treatment process step is as follows:
(1). medium frequency quenching
On the medium frequency quenching stove, rod and plug are drawn in lifting, send after entering coil; Open spraying cooling water; Heat up to quench, 1010～1050 ℃ of quenching temperatures are in time measured the temperature behind the trickle, and controlled temperature is at 150～180 ℃; After workpiece quenches, air cooling, tested for hardness reaches 57～62HRC;
(2). the intermediate frequency tempering
On the intermediate frequency tempering stove, rod and plug are drawn in lifting, send after entering coil; Open spraying cooling water; The intensification tempering, tempering temperature is 560～600 ℃ for the first time; After the workpiece tempering, carry out air cooling, tested for hardness reaches 48～52HRC; Carry out the temper second time after qualified, temperature is controlled at 720～740 ℃, air cooling then, and tested for hardness reaches 36～40HRC; Carry out temper for the third time after qualified, temperature is controlled at 690～710 ℃, air cooling then, and tested for hardness reaches 38～42HRC.
Described ultra-long mandrel is a raw material with 4Cr5MoSiV1 steel (H13), through forging, alignment, rough turn cylindrical, heat-treats after the UT (Ultrasonic Testing) detection is qualified.
The voltage of intermediate frequency of described medium frequency quenching is 365～395V, and intermediate frequency power is 400～700KW, the walking speed 100～120mm/min of workpiece.
Described intermediate frequency tempered voltage of intermediate frequency is 365～395V, and intermediate frequency power is 200～350KW, the walking speed 100～150mm/min of workpiece.
The beneficial effect of this overlength retained mandrel intermediate frequency thermal treatment process is:
1. Frequency Induction Heating technology is simple, and is easy to operate, and speed is fast, and it is few that charcoal is taken off in oxidation, saves material;
2., low power consuming pollution-free to surrounding environment need not alignment after the processing, low cost of manufacture, efficient height;
3. homogeneous heating, the core table temperature difference is minimum, the accuracy of temperature control height, surperficial and subcutaneous four-quadrant hardness is even, and impact value can improve 10%, postpones the use crack performance of plug, can prolong work-ing life more than 2 times;
4. this technology also is applicable to the thermal treatment of common floating core rod, retained mandrel.
Embodiment
Below introduce embodiments of the invention.
Below introduce the heat treating method of ultra-long mandrel.
Embodiment 1: φ 107 * 15000mm
On the medium frequency quenching stove: (1), electrical equipment service platform send electricity, open heater coil, electrical equipment, apparatus cools pump, and hang on and draw rod and plug, the starting power wheel, after waiting to draw rod and all entering coil, coil send; (2), open spraying cooling water, plug moves ahead immediately following drawing rod; (3), adjust electrical parameter, intensification, 1020 ℃ of quenching temperature requirements.Walking speed 120mm/min, behind certain distance, the workpiece tail end is then gone up another workpiece, and two workpiece should join end to end.(4) after workpiece quenches, air cooling.Carry out hardness test subsequently, guarantee that hardness is in 57～62HRC scope.
On the intermediate frequency tempering stove: (1), electrical equipment service platform send electricity, open heater coil, electrical equipment, apparatus cools pump, and hang on and draw rod and plug, the starting power wheel, after rod to be drawn entered coil, coil sent; (2), open spraying cooling water, plug moves ahead immediately following drawing rod.(3), adjust electrical parameter, heat up, tempering temperature requires 580 ℃ for the first time, walking speed 150mm/min, behind certain distance, the workpiece tail end is then gone up another workpiece, two workpiece should join end to end.After the workpiece tempering, carry out air cooling, guarantee that hardness is in 48～52HRC scope; (4), carry out the temper second time after qualified, temperature is controlled at 725 ℃, and air cooling guarantees that hardness is in 36～40HRC scope then; (5), carry out temper for the third time after qualified, temperature is controlled at 695 ℃, and air cooling guarantees that hardness is in 38～42HRC scope then.
Embodiment 2: φ 180 * 18000mm
On the medium frequency quenching stove: (1), electrical equipment service platform send electricity, open heater coil, electrical equipment, apparatus cools pump, and hang on and draw rod and plug, the starting power wheel, after waiting to draw rod and all entering coil, coil send; (2), open spraying cooling water, plug moves ahead immediately following drawing rod; (3), adjust electrical parameter, intensification, 1030 ℃ of quenching temperature requirements.Walking speed 110mm/min, behind certain distance, the workpiece tail end is then gone up another workpiece, and two workpiece should join end to end.(4) after workpiece quenches, air cooling.Carry out hardness test subsequently, guarantee that hardness is in 57～62HRC scope.
On the intermediate frequency tempering stove: (1), electrical equipment service platform send electricity, open heater coil, electrical equipment, apparatus cools pump, and hang on and draw rod and plug, the starting power wheel, after rod to be drawn entered coil, coil sent; (2), open spraying cooling water, plug moves ahead immediately following drawing rod.(3), adjust electrical parameter, intensification, 580 ℃ of tempering temperature requirements for the first time.Walking speed 140mm/min, behind certain distance, the workpiece tail end is then gone up another workpiece, and two workpiece should join end to end.After the workpiece tempering, carry out air cooling, guarantee that hardness is in 48～52HRC scope; (4), carry out the temper second time after qualified, temperature is controlled at 730 ℃, and air cooling guarantees that hardness is in 36～40HRC scope then; (5), carry out temper for the third time after qualified, temperature is controlled at 700 ℃, and air cooling guarantees that hardness is in 38～42HRC scope then.
Embodiment 3: φ 277 * 20000mm
On the medium frequency quenching stove: (1), electrical equipment service platform send electricity, open heater coil, electrical equipment, apparatus cools pump, and hang on and draw rod and plug, the starting power wheel, after waiting to draw rod and all entering coil, coil send; (2), open spraying cooling water, plug moves ahead immediately following drawing rod; (3), adjust electrical parameter, intensification, 1040 ℃ of quenching temperature requirements.Walking speed 100mm/min, behind certain distance, the workpiece tail end is then gone up another workpiece, and two workpiece should join end to end.(4) after workpiece quenches, air cooling.Carry out hardness test subsequently, guarantee that hardness is in 57～62HRC scope.
On the intermediate frequency tempering stove: (1), electrical equipment service platform send electricity, open heater coil, electrical equipment, apparatus cools pump, and hang on and draw rod and plug, the starting power wheel, after rod to be drawn entered coil, coil sent; (2), open spraying cooling water, plug moves ahead immediately following drawing rod.(3), adjust electrical parameter, intensification, 590 ℃ of tempering temperature requirements for the first time.Walking speed 100mm/min, behind certain distance, the workpiece tail end is then gone up another workpiece, and two workpiece should join end to end.After the workpiece tempering, carry out air cooling, guarantee that hardness is in 48～52HRC scope; (4), carry out the temper second time after qualified, temperature is controlled at 735 ℃, and air cooling guarantees that hardness is in 36～40HRC scope then; (5), carry out temper for the third time after qualified, temperature is controlled at 705 ℃, and air cooling guarantees that hardness is in 38～42HRC scope then.
Claims (6)
1. heat treatment technology of ultra-long mandrel, it is characterized in that: described ultra-long mandrel is that H13 is a raw material with the 4Cr5MoSiV1 steel, heat-treats on Medium Frequency Induction Heating Furnace, and its thermal treatment process step is as follows:
(1). medium frequency quenching
On the medium frequency quenching stove, rod and plug are drawn in lifting, send after entering coil; Open spraying cooling water; Heat up to quench, 1010～1050 ℃ of quenching temperatures are in time measured the temperature behind the trickle, and controlled temperature is at 150～180 ℃; After workpiece quenches, air cooling, tested for hardness reaches 57～62HRC;
(2). the intermediate frequency tempering
On the intermediate frequency tempering stove, rod and plug are drawn in lifting, send after entering coil; Open spraying cooling water; The intensification tempering, tempering temperature is 560～600 ℃ for the first time; After the workpiece tempering, carry out air cooling, tested for hardness reaches 48～52HRC; Carry out the temper second time after qualified, temperature is controlled at 720～740 ℃, air cooling then, and tested for hardness reaches 36～40HRC; Carry out temper for the third time after qualified, temperature is controlled at 690～710 ℃, air cooling then, and tested for hardness reaches 38～42HRC.
2. according to the described heat treatment technology of ultra-long mandrel of claim 1, it is characterized in that: described ultra-long mandrel is a raw material with 4Cr5MoSiV1 steel (H13), through forging, alignment, rough turn cylindrical, heat-treats after the UT (Ultrasonic Testing) detection is qualified.
3. according to the described heat treatment technology of ultra-long mandrel of claim 1, it is characterized in that: 1030 ℃ of described quenching temperatures.
4. according to the described heat treatment technology of ultra-long mandrel of claim 1, it is characterized in that: the voltage of intermediate frequency of described medium frequency quenching is 365～395V, and intermediate frequency power is 400～700KW, and the walking speed of workpiece is 100～120mm/min.
5. according to the described heat treatment technology of ultra-long mandrel of claim 1, it is characterized in that: 580 ℃ of the described intermediate frequency tempered tempering temperatures first time, tempering temperature is 730 ℃ for the second time, tempering temperature is 700 ℃ for the third time.
6. according to the described heat treatment technology of ultra-long mandrel of claim 1, it is characterized in that: described intermediate frequency tempered voltage of intermediate frequency is 365～395V, and intermediate frequency power is 200～350KW, the walking speed 100～150mm/min of workpiece.
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| CN102825089A (en) * | 2012-09-11 | 2012-12-19 | 西南铝业（集团）有限责任公司 | Extruder and extrusion shaft thereof |
| CN105369129A (en) * | 2015-12-28 | 2016-03-02 | 常熟市双灵船舶设备有限公司 | Three-sheave block |
| CN110438310B (en) * | 2019-07-19 | 2020-08-14 | 北京科技大学 | Hot work die steel and heat treatment method thereof |
| CN112355587B (en) * | 2020-11-13 | 2023-05-16 | 河南中原特钢装备制造有限公司 | Processing method for reducing semi-precision runout of ultra-long thin round bar |
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| SE426177B (en) * | 1979-12-03 | 1982-12-13 | Uddeholms Ab | Hot work tool steel |
| JP2006213990A (en) * | 2005-02-07 | 2006-08-17 | Nippon Koshuha Steel Co Ltd | Manufacturing method of hot working die |
| CN100513617C (en) * | 2005-08-10 | 2009-07-15 | 马鞍山钢铁股份有限公司 | Hot work die steel and its preparation method |
| CN101121954B (en) * | 2006-08-08 | 2010-10-06 | 上海市机械制造工艺研究所有限公司 | H13 steel vacuum time-control quenching heat treatment technique |
| CN101255488B (en) * | 2007-03-02 | 2012-07-25 | 上海市机械制造工艺研究所有限公司 | Quality optimization process for H13 steel vacuum thermal treatment |
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