CN101353717A - Process for producing high strength hardened and tempered steel by steekle mill on-line quenching - Google Patents
Process for producing high strength hardened and tempered steel by steekle mill on-line quenching Download PDFInfo
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Abstract
The invention relates to a production technology of high-strength quenched and tempered steel, in particular to a technology for the online quenching production of the high-strength quenched and tempered steel by using a steckel mill, comprising the following procedures of: (1) billet heating: temperature in a preheating section is less than or equal to 600 DEG C, and the temperature in a heating section is between 1220 DEG C and 1180 DEG C; (2) primary scale removal of high pressure water: the water pressure is more than or equal to 18Mpa; (3) controlled rolling: during the controlled rolling of a first stage, single path draft is more than or equal to 10 percent to 15 percent, and the total draft is more than or equal to 50 percent; during the controlled rolling of a second stage, steel rolling is carried out below recrystallization temperature, and the draft is controlled to be between 40 to 70 percent; (4) online quenching by using HACC; (5) offline tempering: the tempering temperature is between 550 to 670 DEG C, and the heat preservation time is 2 to 6min/mm. The technology for the online quenching and self-tempering production of the high-strength quenched and tempered steel by using the steckel mill can improve the production efficiency by dozens of times, lower the cost, not only reduce the reheating energy consumption, but also reduce the water resource consumption of offline quenching, and reduce investment on a quenching machine set.
Description
Technical field
The present invention relates to a kind of production technique of high-strength hardened and tempered steel, specifically the technology of producing high strength hardened and tempered steel by steekle mill on-line quenching.
Background technology
The high-strength hardened and tempered steel plate is pressed the purposes branch: high-strength pressure vessel hardened and tempered steel plate (strategic oil reserve jar), high-strength engineering machinery steel, high strength ship hull structure use steel, the demand of railroad train carried of crude oil groove jar and hydropower station pressure steel pipe is also very big simultaneously, and at present a large amount of high-strength hardened and tempered steel plates still need from external import.
The production technique of high-strength hardened and tempered steel adopts the technology of " middle plate mill hot rolling+off-line quenching+off-line tempering " to produce mostly at present.As the domestic beginning of the nineties, Wuhan Iron and Steel Company at first adopts " off-line quenching+tempering " explained hereafter high-strength hardened and tempered steel plate, has filled up domestic blank, the alternative import of part high-strength hardened and tempered steel, but production cost height.Wuyang Iron ﹠ Steel Co., Ltd., Baogang Stocks Trading Co. and Anshan Steel stock Co., Ltd produce with " common middle plate mill rolling+off-line quenching+tempering " in the production of high strength non-quenched and tempered steel plate.The Canada and the U.S. adopt " common middle plate mill rolling+off-line quenching+tempering " production high-strength hardened and tempered steel plate on Steckel mill.
The technology of " middle plate mill hot rolling+off-line quenching+off-line tempering " is specific as follows: hot rolling:
Steel billet is heated to 1200 ℃, controlled rolling becomes steel plate, finishing temperature is controlled at 800～900 ℃, steel plate adopts weak water spray to be cooled to 700～800 ℃ to guarantee the steel plate planeness by accelerated cooling device (ACC), by high rigidity heat rectification machine leveling, be as cold as 250 ℃ of left and right sides cuttolength steel plates in the cold bed sky, steel plate spray printing sign, steel plate rolls off the production line and is cooled to below 100 ℃ flaw detection (this process needs 3 days to the thick steel plate in the 30mm left and right sides in winter, need 4～6 days summer), at this moment steel plate is one " intermediates " hot rolling attitude steel plate to the high-strength hardened and tempered steel plate, and the metallographic structure of steel plate is " ferrite α+perlite P ".
Off-line quenches:
The qualified hot rolling attitude steel plate of flaw detection is transported to the heat-treatment quenching workshop,, go into stove, the steel plate block-by-block is heated to austenitic state by stove at the bottom of the roller by fast shot peening, as: wherein temperature rise rate 1.5min/mm is heated to 930 ℃ with steel plate; The insulation certain hour allows the metallographic structure complete austenitizing of steel plate; The usefulness of coming out of the stove again (roller press type) quenching press spray quenching to 50～200 ℃, the structural transformation of steel is become bainite+martensite, the spray printing sign, at this moment steel plate or intermediates, the metallographic structure of steel plate are " martensite M " or " martensite M+ bainite B " or " martensite M+ bainite B+ residual austenite γ ".
The off-line tempering:
Steel plate after quenching is delivered to the tempering heat treatment workshop, go into stove, the steel plate block-by-block is heated to 500～700 ℃ by stove at the bottom of the roller, as: wherein temperature rise rate 2.5min/mm is heated to 930 ℃ with steel plate; The insulation certain hour, allow the martensitic stucture of steel plate change, obtain the hardened and tempered steel plate of high strength, high tenacity, the metallographic structure of steel plate at this moment is " tempered martensite M '+ferrite α " or " tempered martensite+bainite+ferrite α " or " bainite+ferrite α "; The spray printing sign, performance qualified back delivery.
The shortcoming of this technology is: every block plate heating needs about 3 hours, and output is very low; The steel plate travelling speed is 6～12 meters/minute kinds during quenching, and the production process cycle is long; Heat treatment furnace quenching unit is made an investment in 300,000,000 yuan, and steel plate per ton increases by 800～1200 yuan of production costs, production cost height.
Summary of the invention
The objective of the invention is to propose a kind of with short production cycle, production efficiency height, the technology of the producing high strength hardened and tempered steel by steekle mill on-line quenching that production cost is low.
Purpose of the present invention can be achieved through the following technical solutions:
The technology of producing high strength hardened and tempered steel by steekle mill on-line quenching comprises following operation:
(1) steel billet heating: preheating section temperature≤600 ℃, 1180～1220 ℃ of heating zone temperature, 1180～1210 ℃ of soaking zone temperature, total heat-up time 8～12min/cm, soaking zone soaking time 30min wherein, be convenient to steel billet being heated to the austenitic area homogeneous microstructureization, prevent the billet surface peroxidation simultaneously, 1200 ± 10 ℃ of tapping temperatures;
(2) first de-scaling: the hydraulic pressure 〉=18Mpa of high pressure water guarantees to remove the once oxidation iron sheet that hot base surface produces in heat-processed;
(3) controlled rolling: during the fs controlled rolling, single pass draft 10%～15%, total draft 〉=50%, broken as far as possible continuously cast bloom columnar grain, realize recrystallize, thereby crystal grain thinning, the homogeneous grain size after the assurance roughing is during the subordinate phase controlled rolling, below recrystallization temperature, carry out steel rolling, assurance is the inherent crystal grain draw down of steel billet, and no longer grows up, and draft is controlled at 40～70%;
(4) carry out the columnar laminar flow refrigerating unit that press quenching: HACC is arranged on the output channel with HACC (senior online accelerated cooling device) and adopt U-shaped upper header and straight tube lower collector pipe, be divided into fast cold-zone, accurate adjustment cooling zone and fine setting cooling zone, adopt strong cold continuous boiling water and two kinds of cooling strategies of strong cold interval boiling water, minimum rate of cooling is 15 ℃/s, roll speed is 1.1～1.45m/s, and it is wide that the cooling back adopts the steel plate roughness before temperature correction and the cold strong assurance off-line tempering heat treatment to reach the full plate of 8～10mm/;
(5) off-line tempering: 550～670 ℃ of tempering temperatures, soaking time 2～6min/mm.
Purpose of the present invention can also further realize by following technical measures:
The technology of aforesaid producing high strength hardened and tempered steel by steekle mill on-line quenching, in the wherein said operation (1), before the steel billet preheating, the steel billet cold charge or≤400 ℃ of temperature dresses.
The technology of aforesaid producing high strength hardened and tempered steel by steekle mill on-line quenching in the wherein said operation (3), in the fs controlled rolling, realizes de-scaling between passage with high pressure water, removes the secondary oxidation iron sheet that produces at hot stage in the operation of rolling.
The technology of aforesaid producing high strength hardened and tempered steel by steekle mill on-line quenching, in the wherein said operation (3), after the fs controlled rolling, steel billet on roller-way after air cooling or the first chance water-cooled again steel billet is delivered to air cooling before the machine, be cooled to recrystallization temperature below 980 ℃.
The technology of aforesaid producing high strength hardened and tempered steel by steekle mill on-line quenching, in the wherein said operation (4), HACC is provided with 32 districts altogether, and fast cold-zone is the 1-10 district, and the accurate adjustment district is the 11-20 district, and the fine setting district is the 21-32 district, the water yield configuration in each district of cooling sees the following form:
Table 1
The technology of aforesaid producing high strength hardened and tempered steel by steekle mill on-line quenching, in the wherein said operation (4), boiling water water than (ratio of lower collector pipe minable water yield and upper header minable water yield) is: 12mm～15mm steel plate boiling water water ratio is 1.5～2.2,16mm～20mm steel plate boiling water water ratio is 1.8～2.5,21mm～27mm steel plate boiling water water ratio is 1.9～2.8, and 28mm～35mm steel plate boiling water water ratio is 2.0～3.2.
Advantage of the present invention is: the technology steel plate motherboard length that Steckel mill press quenching of the present invention and self-tempering are produced high-strength hardened and tempered steel can reach about 25 meters, the steel plate travelling speed is 1.0～2.5 meter per seconds during quenching, production efficiency improves tens times, cost descends, both reduced the energy consumption of reheat, reduce the consumption of off-line quench water resource again, reduced the investment of quenching unit.Utilize explained hereafter high-strength hardened and tempered steel of the present invention, goods batch is short, and cost is low, and the added value of product height can satisfy the manufacturing requirements of quenched and tempered steel " press quenching ".Explained hereafter high-strength hardened and tempered steel plate of the present invention is saved the energy, environmental friendliness, production cycle shortens 2/3, the production time of 10 times of quenching throughput raisings, saving heat treatment furnace doubles tempering throughput, and plate shape control accuracy is brought up to 6mm/m, can save 300,000,000 yuan of modified lines investments.
Embodiment
Embodiment one
The technology of producing high strength hardened and tempered steel by steekle mill on-line quenching comprises following operation:
(1) steel billet heating: steel billet cold charge, 600 ℃ of preheating section temperature, 1180 ℃ of heating zone temperature, 1210 ℃ of soaking zone temperature, total heat-up time 8min/cm, wherein soaking zone soaking time 30min is convenient to steel billet and is being heated to the austenitic area homogeneous microstructureization, prevent the billet surface peroxidation simultaneously, 1200 ℃ of tapping temperatures;
(2) high pressure water de-scaling just: hydraulic pressure 18Mpa guarantees to remove the once oxidation iron sheet that hot base surface produces in heat-processed;
(3) controlled rolling: during the fs controlled rolling, single pass draft 10%, total draft 50%, broken as far as possible continuously cast bloom columnar grain, realize recrystallize, thus crystal grain thinning, the homogeneous grain size after the assurance roughing, realize de-scaling between passage with high pressure water, remove the secondary oxidation iron sheet that produces at hot stage in the operation of rolling, after the fs controlled rolling, steel billet is air cooling on roller-way, be cooled to recrystallization temperature below 980 ℃, during the subordinate phase controlled rolling, below recrystallization temperature, carry out steel rolling, guarantee inherent crystal grain draw down steel billet, and no longer grow up, draft is controlled at 40%;
(4) carry out the columnar laminar flow refrigerating unit that press quenching: HACC is arranged on the output channel with HACC (senior online accelerated cooling device) and adopt U-shaped upper header and straight tube lower collector pipe, be divided into fast cold-zone, accurate adjustment cooling zone and fine setting cooling zone, adopt strong cold continuous boiling water and two kinds of cooling strategies of strong cold interval boiling water, rate of cooling is 15 ℃/s, roll speed is 1.1m/s, it is wide that the cooling back adopts the steel plate roughness before temperature correction and the cold strong assurance off-line tempering heat treatment to reach the full plate of 8mm/, HACC is provided with 32 districts altogether, fast cold-zone is the 1-10 district, the accurate adjustment district is the 11-20 district, the fine setting district is the 21-32 district, boiling water water than (ratio of lower collector pipe minable water yield and upper header minable water yield) is: 12mm～15mm steel plate boiling water water ratio is 1.5,16mm～20mm steel plate boiling water water ratio is 1.8,21mm～27mm steel plate boiling water water ratio is 1.9, and 28mm～35mm steel plate boiling water water ratio is 2.0;
(5) off-line tempering: 550 ℃ of tempering temperatures, soaking time 2min/mm.
Embodiment two
The technology of producing high strength hardened and tempered steel by steekle mill on-line quenching comprises following operation:
(1) steel billet heating: before the steel billet preheating, 400 ℃ of temperature dresses of steel billet, 500 ℃ of preheating section temperature, 1200 ℃ of heating zone temperature, 1190 ℃ of soaking zone temperature, total heat-up time 10min/cm, soaking zone soaking time 30min wherein, be convenient to steel billet being heated to the austenitic area homogeneous microstructureization, prevent the billet surface peroxidation simultaneously, 1200 ℃ of tapping temperatures;
(2) first de-scaling: the hydraulic pressure 〉=18Mpa of high pressure water guarantees to remove the once oxidation iron sheet that hot base surface produces in heat-processed;
(3) controlled rolling: during the fs controlled rolling, single pass draft 10%～15%, total draft 〉=50%, broken as far as possible continuously cast bloom columnar grain is realized recrystallize, thus crystal grain thinning, homogeneous grain size after the assurance roughing, in the fs controlled rolling, realize de-scaling between passage, remove the secondary oxidation iron sheet that produces at hot stage in the operation of rolling with high pressure water, after the fs controlled rolling, water-cooled is delivered to air cooling before the machine to steel billet again after the steel billet first chance, is cooled to recrystallization temperature below 980 ℃, during the subordinate phase controlled rolling, below recrystallization temperature, carry out steel rolling, assurance is the inherent crystal grain draw down of steel billet, and no longer grows up, and draft is controlled at 50%;
(4) carry out the columnar laminar flow refrigerating unit that press quenching: HACC is arranged on the output channel with HACC (senior online accelerated cooling device) and adopt U-shaped upper header and straight tube lower collector pipe, be divided into fast cold-zone, accurate adjustment cooling zone and fine setting cooling zone, adopt strong cold continuous boiling water and two kinds of cooling strategies of strong cold interval boiling water, rate of cooling is 18 ℃/s, roll speed is 1.2m/s, it is wide that the cooling back adopts the steel plate roughness before temperature correction and the cold strong assurance off-line tempering heat treatment to reach the full plate of 9mm/, HACC is provided with 32 districts altogether, fast cold-zone is the 1-10 district, the accurate adjustment district is the 11-20 district, the fine setting district is the 21-32 district, boiling water water than (ratio of lower collector pipe minable water yield and upper header minable water yield) is: 12mm～15mm steel plate boiling water water ratio is 1.5～2.2,16mm～20mm steel plate boiling water water ratio is 1.8～2.5,21mm～27mm steel plate boiling water water ratio is 1.9～2.8, and 28mm～35mm steel plate boiling water water ratio is 2.0～3.2;
(5) off-line tempering: 600 ℃ of tempering temperatures, soaking time 4min/mm.
Embodiment three
The technology of producing high strength hardened and tempered steel by steekle mill on-line quenching comprises following operation:
(1) steel billet heating: before the steel billet preheating, 300 ℃ of temperature dresses of steel billet, 400 ℃ of preheating section temperature, 1220 ℃ of heating zone temperature, 1210 ℃ of soaking zone temperature, total heat-up time 12min/cm, soaking zone soaking time 30min wherein, be convenient to steel billet being heated to the austenitic area homogeneous microstructureization, prevent the billet surface peroxidation simultaneously, 1210 ℃ of tapping temperatures;
(2) first de-scaling: the hydraulic pressure 〉=18Mpa of high pressure water guarantees to remove the once oxidation iron sheet that hot base surface produces in heat-processed;
(3) controlled rolling: during the fs controlled rolling, single pass draft 10%～15%, total draft 〉=50%, broken as far as possible continuously cast bloom columnar grain is realized recrystallize, thus crystal grain thinning, homogeneous grain size after the assurance roughing, in the fs controlled rolling, realize de-scaling between passage, remove the secondary oxidation iron sheet that produces at hot stage in the operation of rolling with high pressure water, after the fs controlled rolling, water-cooled is delivered to air cooling before the machine to steel billet again after the steel billet first chance, is cooled to recrystallization temperature below 980 ℃, during the subordinate phase controlled rolling, below recrystallization temperature, carry out steel rolling, assurance is the inherent crystal grain draw down of steel billet, and no longer grows up, and draft is controlled at 70%;
(4) carry out the columnar laminar flow refrigerating unit that press quenching: HACC is arranged on the output channel with HACC (senior online accelerated cooling device) and adopt U-shaped upper header and straight tube lower collector pipe, be divided into fast cold-zone, accurate adjustment cooling zone and fine setting cooling zone, adopt strong cold continuous boiling water and two kinds of cooling strategies of strong cold interval boiling water, rate of cooling is 20 ℃/s, roll speed is 1.45m/s, it is wide that the cooling back adopts the steel plate roughness before temperature correction and the cold strong assurance off-line tempering heat treatment to reach the full plate of 10mm/, HACC is provided with 32 districts altogether, fast cold-zone is the 1-10 district, the accurate adjustment district is the 11-20 district, the fine setting district is the 21-32 district, boiling water water than (ratio of lower collector pipe minable water yield and upper header minable water yield) is: 12mm～15mm steel plate boiling water water ratio is 1.5～2.2,16mm～20mm steel plate boiling water water ratio is 1.8～2.5,21mm～27mm steel plate boiling water water ratio is 1.9～2.8, and 28mm～35mm steel plate boiling water water ratio is 2.0～3.2;
(5) off-line tempering: 670 ℃ of tempering temperatures, soaking time 6min/mm.
Among the embodiment one to embodiment three, when carrying out press quenching with HACC, the water yield configuration in each district of cooling sees the following form:
Table 2
The present invention can also have other embodiment, and the technical scheme that equal replacement of all employings or equivalent transformation form all drops within the scope of protection of present invention.
Claims (6)
1. the technology of producing high strength hardened and tempered steel by steekle mill on-line quenching is characterized in that: comprise following operation:
(1) steel billet heating: preheating section temperature≤600 ℃, 1180～1220 ℃ of heating zone temperature, 1180～1210 ℃ of soaking zone temperature, total heat-up time 8～12min/cm, soaking zone soaking time 30min wherein, 1200 ± 10 ℃ of tapping temperatures;
(2) first de-scaling: the hydraulic pressure 〉=18Mpa of high pressure water;
(3) controlled rolling: during the fs controlled rolling, single pass draft 10%～15%, total draft 〉=50% during the subordinate phase controlled rolling, carries out steel rolling below recrystallization temperature, and draft is controlled at 40～70%;
(4) carry out the columnar laminar flow refrigerating unit that press quenching: HACC is arranged on the output channel with HACC and adopt U-shaped upper header and straight tube lower collector pipe, be divided into fast cold-zone, accurate adjustment cooling zone and fine setting cooling zone, adopt strong cold continuous boiling water and two kinds of cooling strategies of strong cold interval boiling water, minimum rate of cooling is 15 ℃/s, roll speed is 1.1～1.45m/s, and it is wide that the cooling back adopts the steel plate roughness before temperature correction and the cold strong assurance off-line tempering heat treatment to reach the full plate of 8～10mm/;
(5) off-line tempering: 550～670 ℃ of tempering temperatures, soaking time 2～6min/mm.
2. the technology of producing high strength hardened and tempered steel by steekle mill on-line quenching as claimed in claim 1 is characterized in that: in the described operation (1), before the steel billet preheating, the steel billet cold charge or≤400 ℃ of temperature dresses.
3. the technology of producing high strength hardened and tempered steel by steekle mill on-line quenching as claimed in claim 1, it is characterized in that: in the described operation (3), in the fs controlled rolling, realize de-scaling between passage, remove the secondary oxidation iron sheet that produces at hot stage in the operation of rolling with high pressure water.
4. the technology of producing high strength hardened and tempered steel by steekle mill on-line quenching as claimed in claim 1, it is characterized in that: in the described operation (3), after the fs controlled rolling, steel billet on roller-way after air cooling or the first chance water-cooled again steel billet is delivered to air cooling before the machine, be cooled to recrystallization temperature below 980 ℃.
5. the technology of producing high strength hardened and tempered steel by steekle mill on-line quenching as claimed in claim 1, it is characterized in that: in the described operation (4), HACC is provided with 32 districts altogether, fast cold-zone is the 1-10 district, the accurate adjustment district is the 11-20 district, and the fine setting district is the 21-32 district, and the water yield configuration in each district of cooling sees the following form:
6. the technology of producing high strength hardened and tempered steel by steekle mill on-line quenching as claimed in claim 1, it is characterized in that: in the described operation (4), boiling water water ratio is: 12mm～15mm steel plate boiling water water ratio is 1.5～2.2,16mm～20mm steel plate boiling water water ratio is 1.8～2.5,21mm～27mm steel plate boiling water water ratio is 1.9～2.8, and 28mm～35mm steel plate boiling water water ratio is 2.0～3.2.
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