CN104032311A - Thermal treatment technology for special-shaped steel tube - Google Patents
Thermal treatment technology for special-shaped steel tube Download PDFInfo
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- CN104032311A CN104032311A CN201410307429.5A CN201410307429A CN104032311A CN 104032311 A CN104032311 A CN 104032311A CN 201410307429 A CN201410307429 A CN 201410307429A CN 104032311 A CN104032311 A CN 104032311A
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Abstract
The invention relates to the technical field of special-shaped steel tubes, and particularly relates to a thermal treatment technology for a special-shaped steel tube. The thermal treatment technology comprises the following steps: (1) carrying out high-temperature tempering treatment before quenched-tempered thermal treatment; (2) after the tempering treatment is completed, treating the steel tubes by adopting a method of combining chemical ferrite treatment and chemical austenite treatment; and (3) finally, conducting quenching and tempering, cooling the treated steel tubes into the range of 180-230DEG C, vacuumizing, conducting secondary quenching treatment, and insulating for 2.5-3h; heating again to 580-630DEG C, maintaining a vacuum state, conducting high-temperature tempering, insulating for 7-8h, then cooling to room temperature, thus completing the whole thermal treatment process. For the special-shaped steel tubes treated by the thermal treatment technology, the yielding strength is improved to 1100-1250MPa, the tensile strength is improved to 1200-1350MPa; the special-shaped steel tubes are long in anti-fatigue service life, wear-resistant, corrosion-resistant, low in thermal expansion coefficient, good in weldability, better in the whole straightness of the steel tubes, and low in residual stress; and the thermal treatment technology provided by the invention is green and environmentally friendly and low in cost.
Description
Technical field
The present invention relates to steel tubes technical field, especially a kind of thermal treatment process of steel tubes.
Background technology
Steel tubes is a kind of rectangular steel with hollow section, is widely used in the every field such as the structural members such as automobile, train, aircraft, steamer and space gun, component of machine, petrochemical complex, geological drilling, textile manufacturing machine, radio communication, health care, completion.Adopt steel tubes to manufacture ring-shaped work pieces, can improve material use efficiency, simplified manufacturing technique, saves material and machining period.
In order to ensure the quality of steel pipe, extend the work-ing life of steel pipe, need to heat-treat steel pipe.The thermal treatment process of traditional steel tubes, adopts normalizing heat treatment technique conventionally, and this technique can make material have certain tensile strength, yield strength, but the toughness deficiency of material, counter-bending and warping property ability is low.
For the steel tubes of high-intensity high-tenacity, generally adopt quenching-and-tempering process, improve intensity and the toughness of steel pipe.In modifier treatment process, in order to improve the intensity of material, must reduce and spend temperature freely or shorten tempering insulation time, the toughness of material will reduce like this.And if in order to obtain toughness better, must improve tempering temperature or extend tempering time, the intensity of steel pipe will reduce like this.Existing steel tubes thermal treatment process, improves intensity by quenching solution, is separated out and is improved toughness by tempering, can not effective coordination intensity and toughness between contradictory relation, improve intensity and the toughness of steel pipe.
Summary of the invention
The technical problem to be solved in the present invention is: overcome the low technical deficiency of the strength and toughness of steel tubes in prior art, a kind of thermal treatment process of steel tubes is provided, the anti-yield strength of steel tubes can be increased to 1100-1250MPa, tensile strength is increased to 1200-1350MPa.
For solving the problems of the technologies described above, the technical solution used in the present invention is as follows:
A thermal treatment process for steel tubes, described treatment process comprises the following steps:
(1) before modified thermal treatment, carry out high tempering pre-treatment;
(2) after temper completes, adopt the chemical treatment of iron element, austenite chemistry to process the method combining steel pipe is processed, more than critical temperature, carry out the pyrochemistry thermal treatment of carbonitriding; Meanwhile, more than critical temperature, carry out the pyrochemistry thermal treatment of boronising; Carry out again austenite aluminising;
(3) finally carry out modifier treatment, steel pipe after treatment is cooled to rapidly within the scope of 180-230 DEG C, be evacuated to vacuum, carry out secondary quenching processing, insulation 2.5-3h; Be warming up to again within the scope of 580-630 DEG C, keep vacuum state, carry out high tempering, insulation 7-8h, then be down to room temperature, complete whole heat treatment process.
Further, in described step (1), pretreated temperature is 680-730 DEG C, and soaking time is 45-75min, and after pre-treatment completes, air cooling is to room temperature.
Further, in described step (2), the thermal treatment process of carbonitriding is: by the ammonia through dry decontamination, be heated to 580-630 DEG C by helical pipe, nitrogen is through adding heat evolution nitrogen ion, in helical pipe, pass into methane, after 1.5-2.5h, carburized depth reaches after requirement, and holding temperature remains on 650-700 DEG C, apply 0.05-0.07Pa barometric point, carburetted hydrogen gas and nitrogen ion are full of pending steel pipe surrounding, through 4-5h, stop passing into of methane.
Further, the thermal treatment process of boronising adopts powder boriding method in described step (2), taking Fe-B as for boron and, KBF
4and NH
4hCO
3for energizer, be 800-950 DEG C by temperature control, make it be full of pending steel pipe surrounding, insulation 3-5h.
Further, in described step (2), the process using aluminium of austenite aluminising is bathed method, in aluminium is bathed, adds a small amount of zinc of aluminium and manganese, the addition of zinc is 0.01% of aluminium quality, the addition of manganese is 0.02% of aluminium quality, and control temperature is 650-700 DEG C, and the time is 30-45min.
Adopt the beneficial effect of technical scheme of the present invention to be:
(1) steel tubes obtaining after thermal treatment process of the present invention is processed, anti-yield strength is increased to 1100-1250MPa, and tensile strength is increased to 1200-1350MPa; Anti-fatigue life is long, wear-resisting, corrosion-resistant, and precision is high, and thermal expansivity is low, and weldability is good, and whole straightness of steel pipe is better, and unrelieved stress is low;
(2) thermal treatment process of the present invention, environmental protection, with low cost, be suitable for extensive popularization.
Embodiment
Below in conjunction with specific embodiment, the present invention will be further described.
Embodiment 1
A thermal treatment process for steel tubes, described treatment process comprises the following steps:
(1) before modified thermal treatment, carry out high tempering pre-treatment; Pretreated temperature is 680 DEG C, and soaking time is 45min, and after pre-treatment completes, air cooling is to room temperature.
(2) after temper completes, adopt the chemical treatment of iron element, austenite chemistry to process the method combining steel pipe is processed, more than critical temperature, carry out the pyrochemistry thermal treatment of carbonitriding; Meanwhile, more than critical temperature, carry out the pyrochemistry thermal treatment of boronising; Carry out again austenite aluminising;
The thermal treatment process of carbonitriding is: by the ammonia through dry decontamination, be heated to 580 DEG C by helical pipe, nitrogen, through adding heat evolution nitrogen ion, passes into methane, after 1.5h in helical pipe, carburized depth reaches after requirement, holding temperature remains on 650 DEG C, applies 0.05Pa barometric point, and carburetted hydrogen gas and nitrogen ion are full of pending steel pipe surrounding, through 4h, stop passing into of methane.
The thermal treatment process of boronising adopts powder boriding method, taking Fe-B as for boron and, KBF4 and NH4HCO3 are energizer, are 800 DEG C by temperature control, make it be full of pending steel pipe surrounding, insulation 3h.
The process using aluminium of austenite aluminising is bathed method, in aluminium is bathed, adds a small amount of zinc of aluminium and manganese, and the addition of zinc is 0.01% of aluminium quality, and the addition of manganese is 0.02% of aluminium quality, and controlling temperature is 650 DEG C, and the time is 30min.
(3) finally carry out modifier treatment, steel pipe after treatment is cooled to rapidly within the scope of 180 DEG C, be evacuated to vacuum, carry out secondary quenching processing, insulation 2.5h; Be warming up to again within the scope of 580 DEG C, keep vacuum state, carry out high tempering, insulation 7-8h, then be down to room temperature, complete whole heat treatment process.
Embodiment 2
A thermal treatment process for steel tubes, described treatment process comprises the following steps:
(1) before modified thermal treatment, carry out high tempering pre-treatment; Pretreated temperature is 700 DEG C, and soaking time is 60min, and after pre-treatment completes, air cooling is to room temperature.
(2) after temper completes, adopt the chemical treatment of iron element, austenite chemistry to process the method combining steel pipe is processed, more than critical temperature, carry out the pyrochemistry thermal treatment of carbonitriding; Meanwhile, more than critical temperature, carry out the pyrochemistry thermal treatment of boronising; Carry out again austenite aluminising;
The thermal treatment process of carbonitriding is: by the ammonia through dry decontamination, be heated to 600 DEG C by helical pipe, nitrogen, through adding heat evolution nitrogen ion, passes into methane, after 2h in helical pipe, carburized depth reaches after requirement, holding temperature remains on 680 DEG C, applies 0.06Pa barometric point, and carburetted hydrogen gas and nitrogen ion are full of pending steel pipe surrounding, through 4.5h, stop passing into of methane.
The thermal treatment process of boronising adopts powder boriding method, taking Fe-B as for boron and, KBF
4and NH
4hCO
3for energizer, be 850 DEG C by temperature control, make it be full of pending steel pipe surrounding, insulation 4h.
The process using aluminium of austenite aluminising is bathed method, in aluminium is bathed, adds a small amount of zinc of aluminium and manganese, and the addition of zinc is 0.01% of aluminium quality, and the addition of manganese is 0.02% of aluminium quality, and controlling temperature is 680 DEG C, and the time is 30min.
(3) finally carry out modifier treatment, steel pipe after treatment is cooled to rapidly within the scope of 200 DEG C, be evacuated to vacuum, carry out secondary quenching processing, insulation 2.5h; Be warming up to again within the scope of 600 DEG C, keep vacuum state, carry out high tempering, insulation 7-8h, then be down to room temperature, complete whole heat treatment process.
Embodiment 3
A thermal treatment process for steel tubes, described treatment process comprises the following steps:
(1) before modified thermal treatment, carry out high tempering pre-treatment; Pretreated temperature is 730 DEG C, and soaking time is 75min, and after pre-treatment completes, air cooling is to room temperature.
(2) after temper completes, adopt the chemical treatment of iron element, austenite chemistry to process the method combining steel pipe is processed, more than critical temperature, carry out the pyrochemistry thermal treatment of carbonitriding; Meanwhile, more than critical temperature, carry out the pyrochemistry thermal treatment of boronising; Carry out again austenite aluminising;
The thermal treatment process of carbonitriding is: by the ammonia through dry decontamination, be heated to 630 DEG C by helical pipe, nitrogen, through adding heat evolution nitrogen ion, passes into methane, after 2.5h in helical pipe, carburized depth reaches after requirement, holding temperature remains on 700 DEG C, applies 0.07Pa barometric point, and carburetted hydrogen gas and nitrogen ion are full of pending steel pipe surrounding, through 5h, stop passing into of methane.
The thermal treatment process of boronising adopts powder boriding method, taking Fe-B as for boron and, KBF4 and NH4HCO3 are energizer, are 950 DEG C by temperature control, make it be full of pending steel pipe surrounding, insulation 5h.
The process using aluminium of austenite aluminising is bathed method, in aluminium is bathed, adds a small amount of zinc of aluminium and manganese, and the addition of zinc is 0.01% of aluminium quality, and the addition of manganese is 0.02% of aluminium quality, and controlling temperature is 700 DEG C, and the time is 45min.
(3) finally carry out modifier treatment, steel pipe after treatment is cooled to rapidly within the scope of 230 DEG C, be evacuated to vacuum, carry out secondary quenching processing, insulation 3h; Be warming up to again within the scope of 630 DEG C, keep vacuum state, carry out high tempering, insulation 7-8h, then be down to room temperature, complete whole heat treatment process.
Embodiment 2 is most preferred embodiment.
Although above-described embodiment describes in detail technical scheme of the present invention, but technical scheme of the present invention is not limited to above embodiment, in the situation that not departing from thought of the present invention and aim, any change that technical scheme of the present invention is done all will fall into claims limited range of the present invention.
Claims (5)
1. a thermal treatment process for steel tubes, is characterized in that, described treatment process comprises the following steps:
(1) before modified thermal treatment, carry out high tempering pre-treatment;
(2) after temper completes, adopt the chemical treatment of iron element, austenite chemistry to process the method combining steel pipe is processed, more than critical temperature, carry out the pyrochemistry thermal treatment of carbonitriding; Meanwhile, more than critical temperature, carry out the pyrochemistry thermal treatment of boronising; Carry out again austenite aluminising;
(3) finally carry out modifier treatment, steel pipe after treatment is cooled to rapidly within the scope of 180-230 DEG C, be evacuated to vacuum, carry out secondary quenching processing, insulation 2.5-3h; Be warming up to again within the scope of 580-630 DEG C, keep vacuum state, carry out high tempering, insulation 7-8h, then be down to room temperature, complete whole heat treatment process.
2. the thermal treatment process of a kind of steel tubes according to claim 1, is characterized in that: in described step (1), pretreated temperature is 680-730 DEG C, and soaking time is 45-75min, and after pre-treatment completes, air cooling is to room temperature.
3. the thermal treatment process of a kind of steel tubes according to claim 1, it is characterized in that, in described step (2), the thermal treatment process of carbonitriding is: by the ammonia through dry decontamination, be heated to 580-630 DEG C by helical pipe, nitrogen is through adding heat evolution nitrogen ion, in helical pipe, pass into methane, after 1.5-2.5h, carburized depth reaches after requirement, holding temperature remains on 650-700 DEG C, applies 0.05-0.07Pa barometric point, and carburetted hydrogen gas and nitrogen ion are full of pending steel pipe surrounding, through 4-5h, stop passing into of methane.
4. the thermal treatment process of a kind of steel tubes according to claim 1, it is characterized in that: in described step (2), the thermal treatment process of boronising adopts powder boriding method, taking Fe-B as for boron and, KBF4 and NH4HCO3 are energizer, be 800-950 DEG C by temperature control, make it be full of pending steel pipe surrounding, insulation 3-5h.
5. the thermal treatment process of a kind of steel tubes according to claim 1, it is characterized in that: in described step (2), the process using aluminium of austenite aluminising is bathed method, in bathing, aluminium adds a small amount of zinc of aluminium and manganese, the addition of zinc is 0.01% of aluminium quality, the addition of manganese is 0.02% of aluminium quality, control temperature is 605-700 DEG C, and the time is 30-45min.
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| CN201410307429.5A CN104032311A (en) | 2014-06-30 | 2014-06-30 | Thermal treatment technology for special-shaped steel tube |
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| CN201410307429.5A CN104032311A (en) | 2014-06-30 | 2014-06-30 | Thermal treatment technology for special-shaped steel tube |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018169850A1 (en) * | 2017-03-14 | 2018-09-20 | Bwt Llc | Post-boriding processes for treating pipe and recovering boronizing powder |
| US10870912B2 (en) | 2017-03-14 | 2020-12-22 | Bwt Llc | Method for using boronizing reaction gases as a protective atmosphere during boronizing, and reaction gas neutralizing treatment |
| US11192792B2 (en) | 2017-03-14 | 2021-12-07 | Bwt Llc | Boronizing powder compositions for improved boride layer quality in oil country tubular goods and other metal articles |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0733720A1 (en) * | 1995-03-22 | 1996-09-25 | August Bilstein GmbH | Surface treated piston |
| CN102071428A (en) * | 2010-12-29 | 2011-05-25 | 大连引领科技发展有限公司 | Thermal treatment method for high-precision bearing box |
| CN102080204A (en) * | 2011-03-10 | 2011-06-01 | 大连三木得科技有限公司 | Heating processing technology of metal steel tube |
| CN102888581A (en) * | 2011-07-19 | 2013-01-23 | 栾清杨 | Heat treatment technology of small hoist crane |
| CN103834951A (en) * | 2012-11-27 | 2014-06-04 | 大连经济技术开发区圣洁真空技术开发有限公司 | Thermal treatment technology for high-precision bearing steel |
-
2014
- 2014-06-30 CN CN201410307429.5A patent/CN104032311A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0733720A1 (en) * | 1995-03-22 | 1996-09-25 | August Bilstein GmbH | Surface treated piston |
| CN102071428A (en) * | 2010-12-29 | 2011-05-25 | 大连引领科技发展有限公司 | Thermal treatment method for high-precision bearing box |
| CN102080204A (en) * | 2011-03-10 | 2011-06-01 | 大连三木得科技有限公司 | Heating processing technology of metal steel tube |
| CN102888581A (en) * | 2011-07-19 | 2013-01-23 | 栾清杨 | Heat treatment technology of small hoist crane |
| CN103834951A (en) * | 2012-11-27 | 2014-06-04 | 大连经济技术开发区圣洁真空技术开发有限公司 | Thermal treatment technology for high-precision bearing steel |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018169850A1 (en) * | 2017-03-14 | 2018-09-20 | Bwt Llc | Post-boriding processes for treating pipe and recovering boronizing powder |
| US10870912B2 (en) | 2017-03-14 | 2020-12-22 | Bwt Llc | Method for using boronizing reaction gases as a protective atmosphere during boronizing, and reaction gas neutralizing treatment |
| US11192792B2 (en) | 2017-03-14 | 2021-12-07 | Bwt Llc | Boronizing powder compositions for improved boride layer quality in oil country tubular goods and other metal articles |
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Application publication date: 20140910 |