CN114289657B - Crack sensitive peritectic steel large forging circle and preparation method thereof - Google Patents

Crack sensitive peritectic steel large forging circle and preparation method thereof Download PDF

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CN114289657B
CN114289657B CN202111524797.1A CN202111524797A CN114289657B CN 114289657 B CN114289657 B CN 114289657B CN 202111524797 A CN202111524797 A CN 202111524797A CN 114289657 B CN114289657 B CN 114289657B
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CN114289657A (en
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杜光远
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Jiangsu Zhuhong Forging Co ltd
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Abstract

The invention discloses a large-crack sensitive peritectic steel large-forging circle and a preparation method thereof, and is characterized in that a seven-step method is adopted to reach a large steel ingot of 15-30T, the section of the steel ingot is 1000-1300mm, surface cracks are avoided during forging, and the diameter of the final forging circle is 500-730mm; the seven-step method sequentially comprises the steps of steel ingot casting Bi Jingzhi, red demoulding, slow cooling pit heat preservation, pit discharging, steel ingot surface cleaning, heating, forging and post-forging heat treatment. The preparation method of the crack sensitive peritectic steel large forging circle disclosed by the invention is simple and easy, convenient to operate and control, low in energy consumption, small in equipment dependence and suitable for continuous industrial production; the crack sensitive peritectic steel prepared by the method has few cracks on the surface of the large forged circle, and has high black skin yield and higher economic and social benefits.

Description

Crack sensitive peritectic steel large forging circle and preparation method thereof
Technical Field
The invention relates to the technical field of peritectic steel large forging circle preparation, in particular to a crack sensitive peritectic steel large forging circle and a preparation method thereof.
Background
The 16Mn steel belongs to low alloy structural steel with Q345 level strength, has good comprehensive mechanical properties, good low-temperature properties, excellent plasticity and weldability, and is widely applied to manufacturing metal structures and mechanical parts bearing dynamic loads, such as bridges, vehicles, boilers, oil tanks, cranes, power stations, mining machinery, building structures, chemical containers and the like. With the expansion of the application field, the performance requirements are also higher and higher.
The typical composition of the steel grade 16Mn mass fraction is as follows: C0.17,Si 0.30,Mn 1.40,P 0.020,S 0.005,Al 0.03, wherein the residual elements are Cr, ni and Mo, the steel grade only contains Mn as alloy elements, C is about 0.17 percent, the steel grade is typical peritectic steel, a steel mill adopts a mode of cooling with a mold pit, the steel ingot is demolded after being cooled down, the steel ingot is sent to a forging mill for heating after surface grinding, namely, the process of heating a cold steel ingot, when the single weight of the steel ingot is 15-30T, the section of the steel ingot is 1000-1250mm, surface cracks, mainly transverse cracks and a certain degree of cracks are easy to generate in the steel ingot forging process, and the forging round yield is low or scrapped. In order to solve the problems, the common solution is to cancel the process of loading cold steel ingots into a forging heating furnace, instead of hot-feeding steel ingots, and hot-loading the steel ingots into the forging heating furnace, so that the effect of preventing cracks in the forging process is remarkable. However, the above process route has at least 3 conditions: a chamber type heating furnace is necessary so that the red ingot can be placed in the furnace to be insulated or warmed up most quickly; a well-emptied chamber furnace, so that the ingot is fed red to the furnace immediately; the furnace is charged into the chamber according to the time specified by the process, the actual production coordination is difficult, and the production efficiency is also reduced.
In the prior art, the problem of cracking can be well solved for the steel ingot with larger 16Mn which is sent to the heating furnace of the forging factory in red. However, when only a slow cooling pit is provided, a process of loading a cold ingot into a forging heating furnace is still adopted, the weight is represented by 15-30T/branch, the section of a steel ingot is 1000-1250mm, and how to prevent cracks on the forging surface is described in domestic and foreign documents at present.
Therefore, there is still a need in the art for an effective method for preparing crack-sensitive peritectic steel large forged circles with few surface cracks and high black skin yield.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a large forging circle of crack sensitive peritectic steel and a preparation method thereof, wherein the preparation method is simple and easy to implement, convenient to operate and control, low in energy consumption, low in equipment dependence and suitable for continuous industrial production; the crack sensitive peritectic steel prepared by the method has few cracks on the surface of the large forged circle, and has high black skin yield and higher economic and social benefits.
In order to achieve the above purpose, the invention adopts the following technical scheme: a preparation method of a large-crack sensitive peritectic steel large-forging circle is characterized in that a seven-step method is adopted to achieve a large steel ingot of 15-30T, the section of the steel ingot is 1000-1300mm, surface cracks are avoided during forging, and the diameter of the final forging circle is 500-730mm; the seven-step method sequentially comprises the steps of steel ingot casting Bi Jingzhi, red demoulding, slow cooling pit heat preservation, pit discharging, steel ingot surface cleaning, heating, forging and post-forging heat treatment.
Preferably, the steel ingot is poured and placed, and the method specifically comprises the following steps: and standing the steel ingot on a spindle disc for 7-10 hours after the steel ingot is poured.
Preferably, the red demolding and slow cooling pit heat preservation specifically comprises the following steps: and (3) measuring the temperature of the middle part of the ingot mould during standing, and when the temperature is 650-550 ℃, feeding the ingot mould into a slow cooling pit from the original belt mould, changing into a red-removed steel ingot, namely, feeding the red steel ingot into a heat preservation pit.
Preferably, the pit outlet specifically comprises: the steel ingot is placed in the slow cooling pit for 96-120 hours, the surface temperature of the steel ingot is measured to be less than or equal to 200 ℃, and the steel ingot can be taken out of the pit and cooled in air.
Preferably, the cleaning of the surface of the steel ingot specifically comprises: cooling the surface of the steel ingot to be less than or equal to 80 ℃, checking the surface, grinding by a grinder, removing surface defects according to the technical specification, cleaning riser ends by flame, and sending the cooled ingot to a forging plant outside the commission.
Preferably, the heating is specifically: the steel ingot is heated to 650-800 ℃, kept for 2-5 hours, then heated to 850-900 ℃, kept for 1.0-3.0 hours, heated to 1200-1250 ℃ and kept for 3.5-7.0 hours.
Preferably, the forging specifically includes: the forging temperature is 1200-1250 ℃, firstly square drawing is performed, then round pressing is performed, then round breaking is performed, the total forging ratio is 3.5-5, the final forging temperature is 730-820 ℃, the oxide skin is cleaned in time in the forging process, and the surface defects are reduced; air cooling to 500-560 ℃ on the surface after forging, and immediately entering a heat preservation pit.
Preferably, the post-forging heat treatment includes a tempering treatment and an annealing treatment; the tempering treatment temperature is 640-700 ℃ and the annealing time is 1-2 hours; the annealing temperature of the annealing treatment is 500-600 ℃ and the annealing time is 0.7-2.0 hours.
The invention further aims at providing the large-crack sensitive peritectic steel large-forging round prepared by the preparation method of the large-crack sensitive peritectic steel large-forging round.
Detailed Description
The following detailed description of the preferred embodiments of the present invention will be provided in connection with.
A preparation method of a large-crack sensitive peritectic steel large-forging circle is characterized in that a seven-step method is adopted to achieve a large steel ingot of 15-30T, the section of the steel ingot is 1000-1300mm, surface cracks are avoided during forging, and the diameter of the final forging circle is 500-730mm; the seven-step method sequentially comprises the steps of steel ingot casting Bi Jingzhi, red demoulding, slow cooling pit heat preservation, pit discharging, steel ingot surface cleaning, heating, forging and post-forging heat treatment.
Preferably, the steel ingot is poured and placed, and the method specifically comprises the following steps: and standing the steel ingot on a spindle disc for 7-10 hours after the steel ingot is poured.
Preferably, the red demolding and slow cooling pit heat preservation specifically comprises the following steps: and (3) measuring the temperature of the middle part of the ingot mould during standing, and when the temperature is 650-550 ℃, feeding the ingot mould into a slow cooling pit from the original belt mould, changing into a red-removed steel ingot, namely, feeding the red steel ingot into a heat preservation pit.
Preferably, the pit outlet specifically comprises: the steel ingot is placed in the slow cooling pit for 96-120 hours, the surface temperature of the steel ingot is measured to be less than or equal to 200 ℃, and the steel ingot can be taken out of the pit and cooled in air.
Preferably, the cleaning of the surface of the steel ingot specifically comprises: cooling the surface of the steel ingot to be less than or equal to 80 ℃, checking the surface, grinding by a grinder, removing surface defects according to the technical specification, cleaning riser ends by flame, and sending the cooled ingot to a forging plant outside the commission.
Preferably, the heating is specifically: the steel ingot is heated to 650-800 ℃, kept for 2-5 hours, then heated to 850-900 ℃, kept for 1.0-3.0 hours, heated to 1200-1250 ℃ and kept for 3.5-7.0 hours.
Preferably, the forging specifically includes: the forging temperature is 1200-1250 ℃, firstly square drawing is performed, then round pressing is performed, then round breaking is performed, the total forging ratio is 3.5-5, the final forging temperature is 730-820 ℃, the oxide skin is cleaned in time in the forging process, and the surface defects are reduced; air cooling to 500-560 ℃ on the surface after forging, and immediately entering a heat preservation pit.
Preferably, the post-forging heat treatment includes a tempering treatment and an annealing treatment; the tempering treatment temperature is 640-700 ℃ and the annealing time is 1-2 hours; the annealing temperature of the annealing treatment is 500-600 ℃ and the annealing time is 0.7-2.0 hours.
The invention further aims at providing the large-crack sensitive peritectic steel large-forging round prepared by the preparation method of the large-crack sensitive peritectic steel large-forging round.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages: the invention provides a crack sensitive peritectic steel large forging circle and a preparation method thereof, wherein the preparation method is simple and easy to implement, convenient to operate and control, low in energy consumption, small in equipment dependence and suitable for continuous industrial production; the crack sensitive peritectic steel prepared by the method has few cracks on the surface of the large forged circle, and has high black skin yield and higher economic and social benefits. By adopting the method of the invention, the surface cracks (transverse cracks and crazes) of the 15-30T 16Mn steel ingot with the forged round section (diameter of 500-900 mm) can be effectively prevented from being generated in the forging process, the black skin yield can reach more than 83 percent, and the black skin yield is more than 10 percent higher than that of a cold ingot with a mold pit (the traditional cold ingot with the mold pit is too much cut due to the forging surface cracks), thereby having remarkable economic benefit.
The invention will be further described with reference to specific examples, but the scope of the invention is not limited thereto:
example 1
The embodiment provides a preparation method of a large-crack sensitive peritectic steel large-forging circle, which is characterized in that a seven-step method is adopted to reach a large steel ingot of 15-30T, the section of the steel ingot is 1000-1300mm, surface cracks are avoided during forging, and the diameter of the final forging circle is 500-730mm; the seven-step method sequentially comprises the steps of steel ingot casting Bi Jingzhi, red demoulding, slow cooling pit heat preservation, pit discharging, steel ingot surface cleaning, heating, forging and post-forging heat treatment.
Preferably, the steel ingot is poured and placed, and the method specifically comprises the following steps: and standing the steel ingot on a spindle disc for 8 hours after the steel ingot is poured.
Preferably, the red demolding and slow cooling pit heat preservation specifically comprises the following steps: and (3) measuring the temperature of the middle part of the ingot mould during standing, and when the temperature is 600 ℃, putting the original belt mould into a slow cooling pit, changing into a red-removed steel ingot, namely, putting the red steel ingot into a heat preservation pit.
The pit outlet is specifically as follows: and (3) the steel ingot is placed in the slow cooling pit for 110 hours, the surface temperature of the steel ingot is measured to be less than or equal to 200 ℃, and the steel ingot can be taken out of the pit and cooled in air.
The steel ingot surface cleaning method specifically comprises the following steps: cooling the surface of the steel ingot to be less than or equal to 80 ℃, checking the surface, grinding by a grinder, removing surface defects according to the technical specification, cleaning riser ends by flame, and sending the cooled ingot to a forging plant outside the commission.
The heating is specifically as follows: the ingot was heated to 720 c, kept at 870 c for 3.5 hours, then heated to 1230 c for 2.0 hours, and kept at 5.5 hours.
The forging specifically comprises the following steps: the forging temperature is 1230 ℃, firstly square drawing is performed, then rounding is performed, the total forging ratio is 4.2, the final forging temperature is 790 ℃, the oxide skin is cleaned in time in the forging process, and the surface defects are reduced; air cooling to 500 ℃ on the surface after forging, and immediately entering a heat preservation pit.
The post-forging heat treatment comprises tempering treatment and annealing treatment; the tempering treatment temperature is 640 ℃, and the annealing time is 1 hour; the annealing temperature of the annealing treatment is 500 ℃ and the annealing time is 0.7 hour.
The large-crack sensitive peritectic steel large-forging round is prepared according to the preparation method of the large-crack sensitive peritectic steel large-forging round.
Through testing, the black skin yield of the method is 83%.
Example 2
This example provides a large-crack sensitive peritectic steel large-forging circle and a preparation method thereof, which are basically the same as example 1, except that the heating is specifically: heating the steel ingot to 680 ℃, preserving heat for 3 hours, then heating to 870 ℃, preserving heat for 1.5 hours, and then heating to 1220 ℃ and preserving heat for 4.5 hours; the forging specifically comprises the following steps: the forging temperature is 1220 ℃, firstly square drawing is performed, then rounding is performed, the total forging ratio is 4, the final forging temperature is 760 ℃, the oxide skin is cleaned in time in the forging process, and the surface defects are reduced; air cooling to 520 ℃ on the surface after forging, and immediately entering a heat preservation pit; the post-forging heat treatment comprises tempering treatment and annealing treatment; the tempering treatment temperature is 660 ℃, and the annealing time is 1.2 hours; the annealing temperature of the annealing treatment is 530 ℃, and the annealing time is 1.0 hour.
Through testing, the black skin yield of the method is 87%.
Example 3
This example provides a large-crack sensitive peritectic steel large-forging circle and a preparation method thereof, which are basically the same as example 1, except that the heating is specifically: heating the steel ingot to 720 ℃, preserving heat for 3.5 hours, then heating to 880 ℃, preserving heat for 2.2 hours, and then heating to 1240 ℃ and preserving heat for 5.5 hours; the forging specifically comprises the following steps: the forging temperature is 1240 ℃, firstly square drawing is carried out, then round pressing is carried out, then round falling is carried out, the total forging ratio is 4.4, the final forging temperature is 790 ℃, the oxide skin is cleaned in time in the forging process, and the surface defects are reduced; air cooling to 550 ℃ on the surface after forging, and immediately entering a heat preservation pit; the post-forging heat treatment comprises tempering treatment and annealing treatment; the tempering treatment temperature is 680 ℃ and the annealing time is 1.6 hours; the annealing temperature of the annealing treatment is 550 ℃, and the annealing time is 1.5 hours.
Through testing, the black skin yield of the method is 89%.
Example 4
This example provides a large-crack sensitive peritectic steel large-forging circle and a preparation method thereof, which are basically the same as example 1, except that the heating is specifically: heating the steel ingot to 780 ℃, preserving heat for 4.5 hours, then heating to 890 ℃, preserving heat for 2.5 hours, and then heating to 1240 ℃ and preserving heat for 6.5 hours; the forging specifically comprises the following steps: the forging temperature is 1240 ℃, firstly square drawing is carried out, then round pressing is carried out, then round falling is carried out, the total forging ratio is 4.8, the final forging temperature is 810 ℃, the oxide skin is cleaned in time in the forging process, and the surface defects are reduced; air cooling to 550 ℃ on the surface after forging, and immediately entering a heat preservation pit; the post-forging heat treatment comprises tempering treatment and annealing treatment; the tempering treatment temperature is 690 ℃, and the annealing time is 1.9 hours; the annealing temperature of the annealing treatment is 590 ℃, and the annealing time is 1.8 hours.
Through testing, the black skin yield of the method is 92%.
Example 5
This example provides a large-crack sensitive peritectic steel large-forging circle and a preparation method thereof, which are basically the same as example 1, except that the heating is specifically: heating the steel ingot to 800 ℃, preserving heat for 5 hours, then heating to 900 ℃, preserving heat for 3.0 hours, and then heating to 1250 ℃ and preserving heat for 7.0 hours; the forging specifically comprises the following steps: the forging temperature is 1250 ℃, firstly square drawing is carried out, then round pressing is carried out, then round breaking is carried out, the total forging ratio is 5, the final forging temperature is 820 ℃, the oxide skin is cleaned in time in the forging process, and the surface defects are reduced; air cooling to 560 ℃ on the surface after forging, and immediately entering a heat preservation pit; the post-forging heat treatment comprises tempering treatment and annealing treatment; the tempering treatment temperature is 700 ℃, and the annealing time is 2 hours; the annealing temperature of the annealing treatment is 600 ℃, and the annealing time is 2.0 hours.
Through testing, the black skin yield of the method is 93%.
The above embodiments are provided for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the present invention and to implement the same, but are not intended to limit the scope of the present invention, and all equivalent changes or modifications according to the spirit of the present invention should be included in the scope of the present invention.

Claims (2)

1. A preparation method of a large forged circle of crack sensitive peritectic steel is characterized in that a seven-step method is adopted to avoid 15-30T steel ingots, the section of each steel ingot is 1000-1300mm, surface cracks appear during forging, and the diameter of the final forged circle is 500-730mm; the seven-step method sequentially comprises the steps of steel ingot casting Bi Jingzhi, red demoulding, slow cooling pit heat preservation, pit discharging, steel ingot surface cleaning, heating, forging and post-forging heat treatment;
The steel ingot is poured and placed still, and the concrete steps are as follows: standing the steel ingot on a spindle disc for 7-10 hours after the steel ingot is poured;
The red demolding and slow cooling pit heat preservation is specifically as follows: measuring the temperature of the middle part of the ingot mould during standing, when the temperature is 550-650 ℃, putting the original belt mould into a slow cooling pit, changing into a red-removed steel ingot, namely putting the red steel ingot into the slow cooling pit, and preserving heat;
the pit outlet is specifically as follows: the steel ingot is placed in the slow cooling pit for 96-120 hours, the surface temperature of the steel ingot is measured to be less than or equal to 200 ℃ during the period, the steel ingot is taken out of the pit, and air cooling is carried out;
The steel ingot surface cleaning method specifically comprises the following steps: cooling the surface of the steel ingot to be less than or equal to 80 ℃, checking the surface, grinding by a grinder, removing surface defects according to the technical specification, cleaning riser ends by flame, and conveying the cold ingot to a forging mill;
The heating is specifically as follows: heating the steel ingot to 650-800 ℃, preserving heat for 2-5 hours, then heating to 850-900 ℃, preserving heat for 1.0-3.0 hours, then heating to 1200-1250 ℃ and preserving heat for 3.5-7.0 hours;
The forging specifically comprises the following steps: the forging temperature is 1200-1250 ℃, firstly square drawing is performed, then round pressing is performed, then round breaking is performed, the total forging ratio is 3.5-5, the final forging temperature is 730-820 ℃, the oxide skin is cleaned in time in the forging process, and the surface defects are reduced; air cooling to 500-560 ℃ on the surface after forging, and immediately entering a heat preservation pit;
The post-forging heat treatment comprises tempering treatment and annealing treatment; the tempering treatment temperature is 640-700 ℃ and the annealing time is 1-2 hours; the annealing temperature of the annealing treatment is 500-600 ℃, and the annealing time is 0.7-2.0 hours.
2. A large-crack sensitive peritectic steel large-forging round prepared by the preparation method of the large-forging round of the crack sensitive peritectic steel according to claim 1.
CN202111524797.1A 2021-12-14 2021-12-14 Crack sensitive peritectic steel large forging circle and preparation method thereof Active CN114289657B (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102443706A (en) * 2011-12-09 2012-05-09 攀钢集团成都钢钒有限公司 Control method for surface cracks of P91 electroslag steel
CN104070145A (en) * 2014-06-19 2014-10-01 中国科学院金属研究所 Manufacturing tooling and efficient production method of large height-diameter ratio circular casting billet
CN104399854A (en) * 2014-11-04 2015-03-11 西宁特殊钢股份有限公司 Forging method for improving lateral impact performance of steel material
CN108994230A (en) * 2018-07-16 2018-12-14 成都先进金属材料产业技术研究院有限公司 Method for manufacturing and its forging for 16Mn alloy structure steel forgings
CN109182676A (en) * 2018-11-21 2019-01-11 东北大学无锡研究院 A kind of preparation method of low-temperature impact-resistant carbon manganese steel S355J2G3 forging circle
CN111570688A (en) * 2020-04-21 2020-08-25 洛阳双瑞特种装备有限公司 Forming method for preventing duplex stainless steel end face from forging cracks
KR20210049543A (en) * 2019-10-25 2021-05-06 박혜미 A hot forging method of stainless steel casting having ferrite-austenite dual phase

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102443706A (en) * 2011-12-09 2012-05-09 攀钢集团成都钢钒有限公司 Control method for surface cracks of P91 electroslag steel
CN104070145A (en) * 2014-06-19 2014-10-01 中国科学院金属研究所 Manufacturing tooling and efficient production method of large height-diameter ratio circular casting billet
CN104399854A (en) * 2014-11-04 2015-03-11 西宁特殊钢股份有限公司 Forging method for improving lateral impact performance of steel material
CN108994230A (en) * 2018-07-16 2018-12-14 成都先进金属材料产业技术研究院有限公司 Method for manufacturing and its forging for 16Mn alloy structure steel forgings
CN109182676A (en) * 2018-11-21 2019-01-11 东北大学无锡研究院 A kind of preparation method of low-temperature impact-resistant carbon manganese steel S355J2G3 forging circle
KR20210049543A (en) * 2019-10-25 2021-05-06 박혜미 A hot forging method of stainless steel casting having ferrite-austenite dual phase
CN111570688A (en) * 2020-04-21 2020-08-25 洛阳双瑞特种装备有限公司 Forming method for preventing duplex stainless steel end face from forging cracks

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