CN103014491A - 600MPa low-alloy and high-strength ultra-thick steel plate and producing method thereof - Google Patents
600MPa low-alloy and high-strength ultra-thick steel plate and producing method thereof Download PDFInfo
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Abstract
The invention discloses a 600MPa low-alloy and high-strength ultra-thick steel plate and a producing method thereof, and belongs to the technical field of low-alloy and high-strength steel plate production. The steel plate comprises the following chemical components by weight percentage: 0.15-0.18% of C, 0.20-0.50% of Si, 1.30-1.60% of Mn, less than or equal to 0.02% of P, less than or equal to 0.015% of S, 0.01%-0.05% of Alt, 0.03%-0.09% of V, 0.005-0.020% of N, and the balance of Fe and impurities. The steel plate adopts processes of controlled rolling and controlled cooling, particularly processes of ultra-fast cooling and accelerated laminar cooling. The producing method has the advantages that the method adopts a low alloy and low cost production route; and heat treatment after rolling is not required during a production course, so that the production process is simplified, the production efficiency is improved, and the production cost is reduced.
Description
Technical field
The invention belongs to the low-alloy high-strength steel plate production technical field, particularly a kind of 600MPa level low alloy high-strength super-thick steel plate and production method thereof.
Background technology
Low-alloy high-tensile structural steel is widely used in the fields such as bridge, building structure, machinery industry with its lower alloy content, higher obdurability, good welding property.Along with the fast development of China's economy, every profession and trade has still all proposed higher requirement in quantity to the low-alloy high-tensile structural steel product from variety and quality.By the improvement and bring new ideas of composition, rolling technology, thereby so that organizational controls is more accurate effectively, utilize lower cost of alloy to obtain the structure iron special heavy plate of higher-strength, excellent obdurability, good welds performance.
Contrast case 1: before the present patent application, publication number is the manufacture method that the Chinese invention patent of CN 1537968A has openly illustrated a kind of 460 MPa grade yield strength low-alloy high-tensile structural steel sheet material, it is alloy designs that this structure iron adopts high Nb-Ti, C:0.13 ~ 0.20%, Si:0.2 ~ 0.5%, Mn:1.3 ~ 1.7%, Nb:0.01 ~ 0.02%, Ti:0.005 ~ 0.01%, Als:0.005 ~ 0.015; 1200 ~ 1250 ℃ of Heating temperatures, rolling in two stages.This steel adds noble metal Nb, Ti alloy, and slab heating temperature is high.Thickness on this invention steel plate embodiment is mostly interval in 12 ~ 30mm specification, and is different from the specification limit of the high strength of 50 ~ 100mm described in present patent application special heavy plate.
Contrast case 2: before the present patent application, publication number is to disclose a kind of production method with high-strength engineering machinery usefulness steel in the Chinese invention patent " 640 ~ 800MPa high-strength engineering machinery with steel and production method thereof " of CN 101463449A.The chemical ingredients of this steel is C:0.12 ~ 0.17%, Si:0.2 ~ 0.5%, Mn:1.3 ~ 1.67%, P by mass percentage :≤0.020%, S :≤0.013%, V:0.09 ~ 0.15%, Nb:0.035 ~ 0.060%; This steel plate adopts the alloy system of Nb-V, and cost of alloy is high, and steel plate the thickness specification only be 10 ~ 40mm, different from the specification limit of the high-strength plank of 50 ~ 100mm described in the present patent application.
Contrast case 3: before the present patent application, publication number is the production method that the Chinese invention patent application Publication Specification " low-alloy high-tensile structural steel Q460C special heavy plate and production method thereof " of CN 102041438 A discloses a kind of low-alloy high-tensile structural steel Q460C special heavy plate.This structure iron adopts V-Nb-Ni-Ti microalloy Composition Design system, and molten steel adopts the degassed processing of VD vacuum C a, and rear employing normalizing thermal treatment is rolled in the die casting cast.This Plate Production cost is higher, adopts the production technique of die casting and normalizing to produce, and the production method that adopts from the production method of the high strength special heavy plate described in the present patent application is different.
At present greater than most of two or more the compound adding adopted in the microalloy elements such as adding Mo, Ni, Nb, V, Ti of the production of other High Strength Structural Steel special heavy plate of 50mm specification 600MPa level, adopt the rolling technology of controlled rolling and controlled cooling, roll the rear tempering heat treatment that adopts, its cost of alloy and production cost are all higher more.Add more microalloy element in the steel grade, be unfavorable for welding property, also increased production cost simultaneously.
Summary of the invention
The object of the present invention is to provide a kind of 600MPa level low alloy high-strength super-thick steel plate and production method thereof.Be that 50 ~ 100mm has low cost for thickness especially, high-strong toughness, the super-thick steel plate of good welds performance, this steel plate need not to add Mo, Ni, Nb, the noble metal elements such as Ti, only on the straight carbon steel basis, add V element, utilize the V-N microalloying, adopt controlled rolling, cooling control technology, especially the supper-fast cooling of UFC()+and the cooling of ACC(accelerated stream) process for cooling, adopt the stacking slow cooling measure, need not to roll postheat treatment, utilize refined crystalline strengthening, precipitation strength, the effects such as dispersion-strengthened can be produced intensity greater than 600MPa, the high strength special heavy plate of-20 ℃ of v-notch ballistic work 〉=180J.
A kind of 600MPa level low alloy high-strength super-thick steel plate of the present invention, the weight percent of its chemical ingredients is: C:0.15 ~ 0.18%, Si:0.20 ~ 0.50%, Mn:1.30 ~ 1.60%, P :≤0.02%, S :≤0.015%, Alt:0.01 ~ 0.05%, V:0.03 ~ 0.09%, N:0.005 ~ 0.020%, surplus are Fe and are mingled with.
The effect of each element is as follows in the steel plate composition of the present invention:
C: be strengthening element basic, the most most economical in the steel, by the intensity of solution strengthening and precipitation strength raising steel, but C affects toughness and the welding property of steel.Consider, in proof strength, suitably control carbon content.
Mn: be the solution strengthening element, can improve by solution strengthening the obdurability of steel.
Si: be the solution strengthening element, can improve intensity and the hardness of steel.
P and S: generally speaking, p and s all is harmful element in the steel, increases the fragility of steel.In this steel, belong to harmful element, should control the content of p and s.
Alt: be reductor commonly used in the steel.Add a small amount of aluminium in the steel, but crystal grain thinning improves impelling strength.
V and N: be two kinds of important elements that add in this steel.V is combined with C and N and is formed V(C, N) compound, the carboritride of vanadium can be separated out at the positions such as substructure of crystal boundary and intracrystalline, promotes ferrite to form at intracrystalline and crystal boundary, so that ferrite, perlite are evenly distributed on intracrystalline and crystal boundary, crystal grain thinning.Disperse educt degree and the precipitation size of vanadium nitride be can control by controlling speed of cooling, dispersion-strengthened and precipitation strength effect played.
For a kind of production method of 600MPa level low alloy high-strength super-thick steel plate, concrete technology step and technical parameter are as follows:
(1) smelt: adopt " converter smelting-ladle furnace refining-sheet billet continuous casting " technique, add the VN alloy material in the ladle furnace refining later stage, vanadium nitrogen content ratio is 5 ~ 8 in the control molten steel.
(2) heating: billet heating temperature is 1150 ~ 1200 ℃, to guarantee steel billet abundant austenitizing in process furnace.
(3) rolling: adopt two-stage control rolling, holding gauge is 2 ~ 3 times of finished product thickness, and finishing temperature is 800 ~ 850 ℃.
(4) cooling: adopt the supper-fast cooling of UFC(after the steel plate finish rolling)+and the cooling of ACC(accelerated stream) system accelerates cooling online, and stopping cooling temperature is 600 ~ 650 ℃, and speed of cooling is 5 ~ 10 ℃/S, and steel plate carried out stacking slow cooling 24 ~ 48 hours after the water-cooled.
The invention has the advantages that:
(1) the invention provides the chemical ingredients of 600MPa level low alloy high-strength special heavy plate, do not add the noble metal elements such as Mo, Ni, Nb, Ti, only add an amount of V, N element, adopt low-alloy, low cost production route.
(2) the invention provides the production method of 600MPa level low alloy high-strength special heavy plate, by two stage rolling, the supper-fast cooling of UFC()+ACC(accelerated stream cooling) process for cooling, stacking slow cooling measure, utilize the effects such as refined crystalline strengthening, precipitation strength, dispersion-strengthened, the steel plate obdurability improves in refinement phase-change organization.
(3) production method provided by the invention need not to roll postheat treatment, by cooling controlling and rolling controlling process and stacking slow cooling measure, realizes the stably manufactured of the thick specification 600MPa level low alloy high-strength of 50 ~ 100mm special heavy plate.Simplify production technique, enhance productivity, reduce energy consumption, reduce production costs.
Description of drawings
Fig. 1 is the metallographic structure figure of 75mm specification steel plate among the embodiment 2.
Embodiment
Embodiment 1:
The chemical ingredients of 50mm specification steel plate is: 0.158% C-0.31% Si-1.41% Mn-0.012% P-0.005% S-0.038% Alt-0.055% V-, 0.0086% N.
Production method is:
(1) smelt: adopt " converter smelting-ladle furnace refining-sheet billet continuous casting " technique, add the VN alloy material in the ladle furnace refining later stage, vanadium nitrogen content ratio is 6.4 in the control molten steel.
(2) heating: billet heating temperature is 1181 ℃.
(3) rolling: adopt two-stage control rolling, holding gauge is 150mm, and finishing temperature is 830 ℃.
(4) cooling: adopt the supper-fast cooling of UFC(after the steel plate finish rolling)+and the cooling of ACC(accelerated stream) system accelerates cooling online, and stopping cooling temperature is 633 ℃, and speed of cooling is 9 ℃/S, and steel plate carried out stacking slow cooling 30 hours after the water-cooled.
By aforesaid method, the mechanical property that obtains the low alloy high strength ultra slab is: tensile strength 645MPa, unit elongation 20% ,-20 ℃ of impact toughness value 203J, 196J, 192J.
Embodiment 2:
The chemical ingredients of 75mm specification steel plate is: 0.161% C-0.30% Si-1.43% Mn-0.010% P-0.006% S-0.040% Alt-0.062% V-, 0.0089% N.
Production method is:
(1) smelt: adopt " converter smelting-ladle furnace refining-sheet billet continuous casting " technique, add the VN alloy material in the ladle furnace refining later stage, vanadium nitrogen content ratio is 7 in the control molten steel.
(2) heating: billet heating temperature is 1180 ℃.
(3) rolling: adopt two-stage control rolling, holding gauge is 180mm, and finishing temperature is 843 ℃.
(4) cooling: adopt the supper-fast cooling of UFC(after the steel plate finish rolling)+and the cooling of ACC(accelerated stream) system accelerates cooling online, and stopping cooling temperature is 635 ℃, and speed of cooling is 8 ℃/S, and steel plate carried out stacking slow cooling 36 hours after the water-cooled.
By aforesaid method, the mechanical property that obtains the low alloy high strength ultra slab is: tensile strength 627MPa, unit elongation 22% ,-20 ℃ of impact toughness value 198J, 189J, 193J.
Embodiment 3:
The chemical ingredients of 90mm specification steel plate is: 0.165% C-0.33% Si-1.40% Mn-0.011% P-0.008% S-0.041% Alt-0.051% V-, 0.0093% N.
Production method is:
(1) smelt: adopt " converter smelting-ladle furnace refining-sheet billet continuous casting " technique, add the VN alloy material in the ladle furnace refining later stage, vanadium nitrogen content ratio is 5.5 in the control molten steel.
(2) heating: billet heating temperature is 1181 ℃.
(3) rolling: adopt two-stage control rolling, holding gauge is 200mm, and finishing temperature is 840 ℃.
(4) cooling: adopt the supper-fast cooling of UFC(after the steel plate finish rolling)+and the cooling of ACC(accelerated stream) system accelerates cooling online, and stopping cooling temperature is 640 ℃, and cooling rate is 8 ℃/S, and steel plate carried out stacking slow cooling 40 hours after the water-cooled.
By aforesaid method, the mechanical property that obtains the low alloy high strength ultra slab is: tensile strength 625MPa, unit elongation 23% ,-20 ℃ of impact toughness value 188J, 185J, 187J.
Embodiment 4:
The chemical ingredients of 100mm specification steel plate is: 0.175% C-0.32% Si-1.42% Mn-0.009% P-0.005% S-0.043% Alt-0.065% V-, 0.0097% N.
Production method is:
(1) smelt: adopt " converter smelting-ladle furnace refining-sheet billet continuous casting " technique, add the VN alloy material in the ladle furnace refining later stage, vanadium nitrogen content ratio is 6.7 in the control molten steel.
(2) heating: billet heating temperature is 1185 ℃.
(3) rolling: adopt two-stage control rolling, holding gauge is 200mm, and finishing temperature is 845 ℃.
(4) cooling: adopt the supper-fast cooling of UFC(after the steel plate finish rolling)+and the cooling of ACC(accelerated stream) system accelerates cooling online, and stopping cooling temperature is 645 ℃, and speed of cooling is 6 ℃/S, and steel plate carried out stacking slow cooling 48 hours after the water-cooled.
By aforesaid method, the mechanical property that obtains the low alloy high strength ultra slab is: tensile strength 617MPa, unit elongation 22.5% ,-20 ℃ of impact toughness value 192J, 189J, 190J.
Claims (3)
1. 600MPa level low alloy high-strength super-thick steel plate, it is characterized in that, the weight percent of chemical ingredients is: C:0.15 ~ 0.18%, Si:0.20 ~ 0.50%, Mn:1.30 ~ 1.60%, P :≤0.02%, S :≤0.015%, Alt:0.01 ~ 0.05%, V:0.03 ~ 0.09%, N:0.005 ~ 0.020%, surplus are Fe and are mingled with.
2. steel plate according to claim 1 is characterized in that, the steel plate thickness specification is 50 ~ 100mm.
3. the production method of a 600MPa level low alloy high-strength super-thick steel plate claimed in claim 1 is characterized in that, concrete technology step and technical parameter are as follows:
(1) smelt: adopt " converter smelting-ladle furnace refining-sheet billet continuous casting " technique, add the VN alloy material in the ladle furnace refining later stage, vanadium nitrogen content ratio is 5 ~ 8 in the control molten steel;
(2) heating: billet heating temperature is 1150 ~ 1200 ℃, to steel billet austenitizing in process furnace;
(3) rolling: adopt two-stage control rolling, holding gauge is 2 ~ 3 times of finished product thickness, and finishing temperature is 800 ~ 850 ℃;
(4) cooling: adopt supper-fast cooling and accelerated stream cooling after the steel plate finish rolling, stopping cooling temperature is 600 ~ 650 ℃, and speed of cooling is 5 ~ 10 ℃/S, and steel plate carried out stacking slow cooling 24 ~ 48 hours after the water-cooled.
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Cited By (10)
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|---|---|---|---|---|
| CN103286127A (en) * | 2013-06-14 | 2013-09-11 | 首钢总公司 | Method for manufacturing anticorrosion steel plate for upper deck on crude oil tanker oil cargo tank and steel plate |
| CN103740925A (en) * | 2013-12-26 | 2014-04-23 | 秦皇岛首秦金属材料有限公司 | Method for linkage production of high-toughness pipeline steel by adopting jetting and laminar cooling |
| CN104018065A (en) * | 2014-06-18 | 2014-09-03 | 内蒙古包钢钢联股份有限公司 | S275JR thick borated steel plate and production method thereof |
| CN104213019A (en) * | 2014-08-28 | 2014-12-17 | 首钢总公司 | 600 MPa level automobile axle housing steel and production method thereof |
| CN105274425A (en) * | 2015-10-28 | 2016-01-27 | 中钢集团邢台机械轧辊有限公司 | High-alloy roller for front stage of hot continuous finish rolling and preparation method thereof |
| CN106399847A (en) * | 2016-06-15 | 2017-02-15 | 山东钢铁股份有限公司 | Steel for axle head and preparation method thereof |
| CN106756514A (en) * | 2017-01-24 | 2017-05-31 | 舞阳钢铁有限责任公司 | A kind of special thickness steel plate for building structure of high intensity normalizing type and its production method |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103286127A (en) * | 2013-06-14 | 2013-09-11 | 首钢总公司 | Method for manufacturing anticorrosion steel plate for upper deck on crude oil tanker oil cargo tank and steel plate |
| CN103286127B (en) * | 2013-06-14 | 2015-06-24 | 首钢总公司 | Method for manufacturing anticorrosion steel plate for upper deck on crude oil tanker oil cargo tank and steel plate |
| CN103740925A (en) * | 2013-12-26 | 2014-04-23 | 秦皇岛首秦金属材料有限公司 | Method for linkage production of high-toughness pipeline steel by adopting jetting and laminar cooling |
| CN103740925B (en) * | 2013-12-26 | 2015-03-25 | 秦皇岛首秦金属材料有限公司 | Method for linkage production of high-toughness pipeline steel by adopting jetting and laminar cooling |
| CN104018065A (en) * | 2014-06-18 | 2014-09-03 | 内蒙古包钢钢联股份有限公司 | S275JR thick borated steel plate and production method thereof |
| CN104213019A (en) * | 2014-08-28 | 2014-12-17 | 首钢总公司 | 600 MPa level automobile axle housing steel and production method thereof |
| CN104213019B (en) * | 2014-08-28 | 2016-07-06 | 首钢总公司 | A kind of 600MPa level automobile axle housing steel and production method thereof |
| CN105274425A (en) * | 2015-10-28 | 2016-01-27 | 中钢集团邢台机械轧辊有限公司 | High-alloy roller for front stage of hot continuous finish rolling and preparation method thereof |
| CN106399847A (en) * | 2016-06-15 | 2017-02-15 | 山东钢铁股份有限公司 | Steel for axle head and preparation method thereof |
| CN106399847B (en) * | 2016-06-15 | 2018-05-22 | 山东钢铁股份有限公司 | A kind of axle head steel and preparation method thereof |
| CN106756514A (en) * | 2017-01-24 | 2017-05-31 | 舞阳钢铁有限责任公司 | A kind of special thickness steel plate for building structure of high intensity normalizing type and its production method |
| CN111286678A (en) * | 2020-04-08 | 2020-06-16 | 中天钢铁集团有限公司 | High-sulfur non-quenched and tempered steel for automobile camshaft and production process thereof |
| CN111286678B (en) * | 2020-04-08 | 2021-07-27 | 中天钢铁集团有限公司 | High-sulfur non-quenched and tempered steel for automobile camshaft and production process thereof |
| CN114807768A (en) * | 2022-05-16 | 2022-07-29 | 承德建龙特殊钢有限公司 | Q420 low-alloy high-strength structural steel and production method thereof |
| CN114807768B (en) * | 2022-05-16 | 2023-10-13 | 承德建龙特殊钢有限公司 | Q420 low-alloy high-strength structural steel and production method thereof |
| CN116200672A (en) * | 2022-11-25 | 2023-06-02 | 重庆钢铁股份有限公司 | Low-cost high-strength structural steel plate Q460D and manufacturing method |
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Application publication date: 20130403 |