CN103740918B - For the heat treating method of the hollow core rod of Continuous mill train - Google Patents
For the heat treating method of the hollow core rod of Continuous mill train Download PDFInfo
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- CN103740918B CN103740918B CN201310687454.6A CN201310687454A CN103740918B CN 103740918 B CN103740918 B CN 103740918B CN 201310687454 A CN201310687454 A CN 201310687454A CN 103740918 B CN103740918 B CN 103740918B
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Abstract
The present invention discloses a kind of heat treating method of the hollow core rod for Continuous mill train, and this heat treating method comprises: heating steps, and hollow core rod to be heated is evenly warming up to 900 DEG C in gas furnace, ensures that heat-up time is 5 ~ 6 hours; Quenching Step, after hollow core rod goes out gas furnace, quenches to the hollow core rod after heating, improves water to the cooling power of hollow core rod and inner, outside Homogeneous cooling simultaneously when quenching; Tempering step, 600 ~ 640 DEG C of tempering 18 ~ 26 hours, then makes hollow core rod come out of the stove.Solving low-cost alloy steel hollow core rod by the method adopts traditional quenching technology owing to cooling phenomenon on the low side compared with deficiency, the uneven 4Cr5MoV1Si steel causing the uneven and anti-temper resistance of hollow core rod head, middle part, afterbody hardness and Continuous mill train plug generally to select.The hollow core rod hardness obtained evenly and have comparatively high resistance temper resistance compared with 4Cr5MoV1Si steel core bar; Low alloy steel (30Cr2MoV) is become and manufactures one of plug material.Reduce the production cost of plug.
Description
Technical field
The present invention relates to a kind of heat treating method of hollow core rod, particularly, relate to a kind of heat treating method of the hollow core rod for Continuous mill train.
Background technology
Plug is one of most important warp tool used in the Continuous mill train of production weldless steel tube.Its consumption is comparatively large, and its quality and cost are directly connected to the quality and benefits of seamless steel tube production.And the working conditions of roll seamless steel tube plug is during the course very severe, its surface subjects stress, frictional force and alternating hot and cold stress etc.The plug worked long hours there will be the defect such as surface heat fatigue cracking, machinery scuffing, flake-off block, chromium coating damage.But can the quality of plug quality, directly have influence in the operation of rolling and to carry out smoothly and can institute's wroughtsteel pipe quality meet standard-required, and the height of steel pipe manufacturing cost.
For many years, the plug majority of domestic each seamless steel tube production enterprise relies on import, import plug not only price is very expensive, and the time of delivery is difficult to control, affect to production, this seriously governs the development of China's weldless steel tube industry, therefore, in the urgent need to developing a kind of manufacture method of extensive plug, to meet the demand of domestic market.According to related data analysis, China has gone into operation and the continuous rolling-tube unit that is about to go into operation has 26 covers, and continuous rolling-tube unit annual production can more than 1,000 ten thousand tons, calculate according to continuous rolling-tube unit mean consumption 1.0kg/t pipe, and year consumes nearly 10,000 tons of plug.As can be seen here, along with increasingly sharpening of steel pipe industry competition, reduce production cost, improve productivity effect and become the focus that people pay close attention to, and what affect the important factor of steel pipe's production cost is the cost of plug first.How to improve the quality of plug, reducing plug production cost is problem demanding prompt solution.
Summary of the invention
For above-mentioned deficiency of the prior art, one object of the present invention is the heat treating method providing a kind of hollow core rod for Continuous mill train.
According to an aspect of the present invention, a kind of heat treating method of the hollow core rod for Continuous mill train is provided, described heat treating method comprises the steps: heating steps, and hollow core rod to be heated is evenly warming up to 900 DEG C in gas furnace, ensures that heat-up time is 5 ~ 6 hours; Quenching Step, after hollow core rod goes out gas furnace, quench to the hollow core rod after heating, when quenching, the inside and outside of hollow core rod cools, to improve quenchant to the cooling power of hollow core rod and homogeneity simultaneously; Tempering step, is heated to 600 ~ 640 DEG C by the hollow core rod after quenching and ensures tempering 18 ~ 26 hours, then make hollow core rod come out of the stove in gas furnace.
According to embodiments of the invention, in quenching Step, quenchant is water.
According to embodiments of the invention, the material of hollow core rod is 30Cr2MoV steel.
According to embodiments of the invention, the cool time is 300s ~ 3600s.
According to embodiments of the invention, the chemical composition of 30Cr2MoV steel is by weight percentage: C0.31% ~ 0.34%, Mn0.4% ~ 0.7%, Si0.17% ~ 0.40%, P≤0.008%, S≤0.003%, Cr2.30% ~ 2.70%, Mo0.60% ~ 0.65%, V0.20% ~ 0.25%, Cu≤0.20%, Sn≤0.064%, As≤0.03%, all the other are iron and inevitable impurity.
According to embodiments of the invention, hollow core rod is of a size of
404.7mm × 140mm × 13500mm.
According to the hollow core rod for Continuous mill train of the present invention (
404.7mm × 140mm × 13500mm) heat treating method, the hollow core rod hardness obtained is evenly and have comparatively high resistance temper resistance; Make low alloy steel (30Cr2MoV) become manufacture hollow core rod (
one of 404.7mm × 140mm × 13500mm) material.In addition, the production cost of plug is reduced.
Accompanying drawing explanation
By the description to embodiment carried out below in conjunction with accompanying drawing, above-mentioned and/or other object of the present invention and advantage will become apparent, wherein:
Fig. 1 shows the structural representation of the hollow core rod refrigerating device inside of exemplary embodiment of the present invention.
Embodiment
Be described in detail below in conjunction with the heat treating method of embodiment to the hollow core rod for Continuous mill train of the present invention.
The invention provides a kind of heat treating method of the hollow core rod for Continuous mill train, this heat treating method comprises: heating process, quenching technology, tempering process and process for cooling.
Specifically, in the step of heating process, need to be put into hollow core rod 104 to be heated in process furnace (such as, can be gas furnace) and heat, Heating temperature is 900 DEG C-1020 DEG C, and the heating and thermal insulation time is 5 ~ 6h.
In the step of quenching technology, the hollow core rod 104 after to heating is needed to quench.Specifically, using water as quenchant, the inside and outside of hollow core rod 104 is cooled simultaneously thus improve water to hollow core rod 104 cooling power and homogeneity, wherein, exterior cooling for hollow core rod 104 adopts existing quenching cooler conventional in the art and adopts this area to perform the existing technique that quenching is conventional, and the internal cooling of hollow core rod 104 is performed by hollow core rod refrigerating device inside as shown in Figure 1, this hollow core rod refrigerating device inside 100 comprises the pump 102 for carrying quenchant, for quenchant being delivered to the pipeline 101 of hollow core rod 104 inside and controlling the tensimeter 103 of pressure of quenchant in pipeline, but the present invention is not limited to this.In addition, in the present invention, the pressure by pipeline 101 diameter and tensimeter 103 that control hollow core rod refrigerating device inside 100 makes the cooling of the inside of hollow core rod more even, preferably, the diameter of pipeline can be 80 ~ 200mm, and pressure controllable is built in 0.05 ~ 2MPa.In addition, when cooling the inside of hollow core rod, preferably, the temperature of quenchant water can control at about 20 DEG C.In the present invention, preferably, the cool time can be 300s ~ 3600s.
In the step of tempering process, be heated to 600 ~ 640 DEG C of insulation 18 ~ 26h.The mode of air cooling is adopted to cool the hollow core rod 104 after tempering.
In addition, those skilled in the art are known, the chemical composition of 30Cr2MoV steel (GB) standard by weight percentage: C0.26% ~ 0.34%, Mn0.4% ~ 0.7%, Si0.17% ~ 0.40%, P≤0.035%, S≤0.035%, Cr2.30% ~ 2.70%, Mo0.15% ~ 0.25%, V0.10% ~ 0.20%, Cu≤0.20%, Sn≤0.064%.But in the present invention, for improving the hardening capacity of hollow core rod material and anti-temper resistance, preferably, the material of hollow core rod 104 is 30Cr2MoV steel, be: C0.31% ~ 0.34%, Mn0.4% ~ 0.7%, Si0.17% ~ 0.40%, P≤0.008%, S≤0.003%, Cr2.30% ~ 2.70%, Mo0.60% ~ 0.65%, V0.20% ~ 0.25%, Cu≤0.20%, Sn≤0.064%, As≤0.03%, all the other are iron and inevitable impurity.The present invention substitutes the plug of 4Cr5MoV1Si material by the hollow core rod of 30Cr2MoV material, Cr content is made to reduce to 2.30% ~ 2.70% by 4.50% ~ 5.50%, Mo content reduces to 0.60% ~ 0.65% by 1.00% ~ 1.50%, V content reduces to 0.20% ~ 0.25% by 0.80% ~ 1.20%, through contrast, present invention saves the content of the noble alloy elements such as Cr, Mo, the V added in plug material, cost-saving more than 50%.
In addition, the size of hollow core rod 104 of the present invention can be internal diameter
404.7mm × wall thickness 140mm × length 13500mm.
The present invention by adopt to hollow core rod (
404.7mm × 140mm × 13500mm) cooling of endoporus control flow, water temperature, flow velocity is utilized to improve water to hollow large plug cooling power to cooling power impact, solving low-cost alloy steel hollow core rod adopts tradition quenching owing to cooling deficiency, unevenly causing the uneven and anti-temper resistance phenomenon on the low side of hollow core rod head, middle part, afterbody hardness, carries out hardness determination head, centre, afterbody hardness fluctuations≤30HB to the hollow core rod after air cooling.
In addition, the hollow core rod hardness that obtains of the present invention evenly and have comparatively high resistance temper resistance; Low alloy steel (30Cr2MoV) is become and manufactures one of plug material.
In addition, method of the present invention reduces the production cost of plug.
Example 1
To the hollow core rod 104 of 30Cr2MoV steel (
404.7mm × 140mm × 13500mm) heat-treat.Wherein, the chemical composition of 30Cr2MoV steel is by weight percentage: C0.31% ~ 0.34%, Mn0.4% ~ 0.7%, Si0.17% ~ 0.40%, P≤0.008%, S≤0.003%, Cr2.30% ~ 2.70%, Mo0.60% ~ 0.65%, V0.20% ~ 0.25%, Cu≤0.20%, Sn≤0.064%, As≤0.03%, all the other are iron and inevitable impurity.
This hollow core rod 104 is placed in after gas furnace is heated to 900 DEG C, insulation 6h.Hollow core rod 104 after heating is quenched, cool time is 720s, exterior cooling for hollow core rod 104 adopts existing quenching cooler conventional in the art and adopts this area to perform the existing technique that quenching is conventional, the inside of hollow core rod refrigerating device inside 100 pairs of hollow core rods is adopted to cool for hollow core rod 104 internal cooling, this hollow core rod 104 refrigerating device inside 100 comprises the pipeline 101 for water (temperature is 20 DEG C) being delivered to hollow core rod inside, for carrying the pump 102 of quenchant and controlling the tensimeter 103 of pressure of quenchant in pipeline 1, the diameter of the pipeline 101 simultaneously in hollow core rod refrigerating device inside 100 is 100mm, the pressure of tensimeter 103 is 0.5MPa.Hollow core rod 104 after quenching is heated to 610 DEG C, tempering 26h.Air cooling is carried out to the hollow core rod 104 after tempering.Carry out Mechanics Performance Testing to the hollow core rod after thermal treatment, its result is as shown in table 1.
To example 1
To 4Cr5MoV1Si steel core bar (internal diameter
380mm × length 13500mm) heat-treat.
Wherein, the chemical composition of 4Cr5MoV1Si (GB) number steel is by weight percentage: C0.30% ~ 0.38%, Mn≤0.60%, Si0.70% ~ 1.40%, P≤0.005%, S≤0.003%, Cr4.50% ~ 5.50%, Mo1.00% ~ 1.50%, V0.80% ~ 1.20%, Cu≤0.20%, Sn≤0.064%, As≤0.03%, all the other are iron and inevitable impurity.
This plug is placed in after process furnace is heated to 1030 DEG C, insulation 6h.Quenched in oil by plug after heating, the cool time is 2.5 hours.Plug after quenching is heated to 610 DEG C, tempering 26h, double tempering.Air cooling is carried out to the plug after tempering.Carry out Mechanics Performance Testing to the plug after thermal treatment, its result is as shown in table 1.
Table 1 normal temperature mechanical property contrast table
The data of display as can be seen from table 1, the normal temperature ballistic work of 30Cr2MoV steel hollow core rod and mechanical property are better than normal temperature ballistic work and the mechanical property of 4Cr5MoV1Si steel core bar.
To example 1 and to the plug that example 1 obtains carry out sampling do anti-temper resistance test, result is as shown in table 2:
The anti-temper resistance contrast table of table 2
The data of display as can be seen from table 2: 30Cr2MoV steel hollow core rod anti-stabilizes and be qualitatively better than 4Cr5MoV1Si steel core bar.
In sum, because impact value and anti-temper resistance index weigh the key technical index of continuous mill plug quality, the large hollow core rod of 30Cr2MoV steel (
404.7mm × 140mm × 13500mm) key technical index be better than the large plug of 4Cr5MoV1Si steel (
385.1mm × 13500mm).Therefore, 30Cr2MoV steel can become one of large hollow core rod material of manufacture continuous mill.
Claims (5)
1., for a heat treating method for the hollow core rod of Continuous mill train, described heat treating method comprises the steps:
Heating steps, is evenly warming up to 900 DEG C by hollow core rod to be heated in gas furnace, ensures that heat-up time is 5 ~ 6 hours;
Quenching Step, after hollow core rod goes out gas furnace, quench to the hollow core rod after heating, when quenching, the inside and outside of hollow core rod cools, to improve quenchant to the cooling power of hollow core rod and cooling uniformity simultaneously;
Tempering step, is heated to 600 ~ 640 DEG C by the hollow core rod after quenching and ensures tempering 18 ~ 26 hours, then make hollow core rod come out of the stove in gas furnace,
Wherein, the material of hollow core rod is 30Cr2MoV steel.
2. heat treating method according to claim 1, wherein, in quenching Step, quenchant is water.
3. heat treating method according to claim 1, wherein, the cool time is 300s ~ 3600s.
4. heat treating method according to claim 1, wherein, the chemical composition of 30Cr2MoV steel is by weight percentage: C 0.31% ~ 0.34%, Mn 0.4% ~ 0.7%, Si 0.17% ~ 0.40%, P≤0.008%, S≤0.003%, Cr 2.30% ~ 2.70%, Mo 0.60% ~ 0.65%, V 0.20% ~ 0.25%, Cu≤0.20%, Sn≤0.064%, As≤0.03%, all the other are iron and inevitable impurity.
5. heat treating method according to claim 1, wherein, hollow core rod is of a size of
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| CN101580893A (en) * | 2009-06-10 | 2009-11-18 | 江苏诚德钢管股份有限公司 | High-temperature rapid quenching method for seamless steel tube |
| CN102240889A (en) * | 2011-05-03 | 2011-11-16 | 天津钢管集团股份有限公司 | Manufacturing method for continuously rolling seamless steel pipe by using hollow mandril |
| CN102330024A (en) * | 2011-09-02 | 2012-01-25 | 上海大学 | Steel for tandem tube mill hollow mandrel and preparation technology thereof |
| KR20130135354A (en) * | 2011-03-18 | 2013-12-10 | 신닛테츠스미킨 카부시키카이샤 | Steel pipe quenching method |
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Patent Citations (4)
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| CN101580893A (en) * | 2009-06-10 | 2009-11-18 | 江苏诚德钢管股份有限公司 | High-temperature rapid quenching method for seamless steel tube |
| KR20130135354A (en) * | 2011-03-18 | 2013-12-10 | 신닛테츠스미킨 카부시키카이샤 | Steel pipe quenching method |
| CN102240889A (en) * | 2011-05-03 | 2011-11-16 | 天津钢管集团股份有限公司 | Manufacturing method for continuously rolling seamless steel pipe by using hollow mandril |
| CN102330024A (en) * | 2011-09-02 | 2012-01-25 | 上海大学 | Steel for tandem tube mill hollow mandrel and preparation technology thereof |
Non-Patent Citations (1)
| Title |
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| "改善30Cr2MoV钢大锻件冲击韧性及晶粒度的研究";宋传宝等;《大型铸锻件》;20020630(第2期);正文第16-19页 * |
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Effective date of registration: 20160810 Address after: 610000 Sichuan Chengdu bull market mouth Patentee after: Chengdu Panxi Steel Metallurgy Engineering Technology Co., Ltd. Address before: 610303, No. 268, solidarity South Road, Qingbaijiang District, Sichuan, Chengdu Patentee before: Pangang Group Chengdu Steel & Vanadium Co., Ltd. |