CN101660094B - Large-linear energy welding low-alloy high-strength steel plate and manufacturing method thereof - Google Patents
Large-linear energy welding low-alloy high-strength steel plate and manufacturing method thereof Download PDFInfo
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- CN101660094B CN101660094B CN2009100639974A CN200910063997A CN101660094B CN 101660094 B CN101660094 B CN 101660094B CN 2009100639974 A CN2009100639974 A CN 2009100639974A CN 200910063997 A CN200910063997 A CN 200910063997A CN 101660094 B CN101660094 B CN 101660094B
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Abstract
The invention relates to a large-linear energy welding low-alloy high-strength steel plate and a manufacturing method thereof. The technical scheme is that steel billets contain the following chemical components in percentage by weight: 0.01-0.18 percent by weight of C, 0.05-0.60 percent by weight of Si, 1.50-2.50 percent by weight of Mn, 0.10-1.50 percent by weight of Ni, 0.10-1.50 percent by weight of Cu, 0.001-0.060 percent by weight of Als, 0.01-0.08 percent by weight of Nb, 0.002-0.012 percent by weight of N, 0.001-0.003 percent by weight of B, less than 0.015 percent by weight of P, less than 0.010 percent by weight of S, 0.1-0.9 percent by weight of ZrO2 and the balance of Fe and inevitable impurities. The manufacturing process of the steel plate comprises the following steps: carrying out steel making on molten iron or scrap steel or the molten iron and the scrap steel, and then refining; adding alloy elements according to chemical components of the steel billets and then carrying out continuous casting and hot rolling. The long-wire energy welding low-alloy high-strength steel plate and the manufacturing method thereof have the characteristics of simple chemical components, easy control, low cost and simple process flow; and the manufactured steel plates have high welding quality, low crack sensitivity and high tensile strength.
Description
Technical field
The invention belongs to the Hi-Stren steel technical field.Relate in particular to a kind of large-linear energy welding low-alloy high-strength steel plate and manufacture method thereof.
Background technology
In the last thirty years, for improving the welding efficiency of heavy construction structure, guarantee the safe reliability of its use, large-line energy welding technique such as the single face union-melt weld that welding efficiency is high, electro-gas welding, electroslag welding are used in succession, this has come problem newly for traditional low alloy high strength steel strip, promptly weld the intensity and the toughness variation of coarse-grain heat affected zone (HAZ), and easily produce defectives such as welding cold cracking.Therefore, the HAZ flexible improves the focus and emphasis that becomes Hi-Stren steel large-line energy welding research and development.
(tensile strength is 600～1000MPa) structural transformation behavior and controls forming process and the control method thereof that must fully take all factors into consideration mother metal and welded heat affecting zone tissue thereof Hi-Stren steel under the large-line energy welding conditions.Because the embrittlement of the welded heat affecting zone that softens and cause therefrom of the alligatoring of the welded heat affecting zone tissue under the big welding heat initial conditions, heat affected zone and the reduction of strength of joint are the subject matter in the Hi-Stren steel welding.
For this reason, a large amount of research and discoveries has been carried out, high-strength steel and manufacture method thereof under the large-line energy welding conditions that research and design make new advances in aspects such as domestic and international welded heat affecting zone structure property feature to Hi-Stren steel, austenite crystal growth dynamics.As steel series with high linear energy and low weld crack sensitivity and production method thereof " (ZL02115877.0); " high-performance refractory weather-resisting building steel and production method thereof " (ZL01133562.9); " unmodified high-toughness low-temp steel for high-energy line welding and production method thereof " (ZL01128316.5); large-line energy welding high tenacity molten zinc corrosion resistant is with steel and production method (ZL01128476.5) thereof; " but Plate Steel and manufacture method of the welding of a kind of large-line energy " (CN200510023216.0); " steel in use for soldering pressure pipe in hydraulic power station under large line energy and production method thereof " (CN200510019165.4), " but large-line energy welding superstrength Plate Steel and manufacture method thereof " is (ZL200410017255.5) and " steel series with high linear energy and low weld crack sensitivity and production method thereof " patented technology such as (ZL02115877.0), and there are the following problems:
1, weld heat input is low, is generally 50～150kJ/cm;
2, Si content is higher, because of the Si of high level can promote the formation of M/A, reduces the toughness of HAZ;
3, contain the expensive metal vanadium, the cost of product is improved;
4, the employing hardening and tempering process production that has, thereby the production process complexity, link is many, production cost is high, owing to adopt hardening and tempering process production, carbon content is unfavorable for anti-bigger heat input welding and realizes controlled rolling and controlled chilling and mechanical thermal treatment process (TMCP) in general than non-tempering process height;
5, contain rare earth element in the steel, rare earth element is very active element, is not easy control, and pollutes molten steel easily, is unfavorable for the raising of quality product.
Summary of the invention
The purpose of this invention is to provide a kind of chemical ingredients simple, be easy to control, production cost is low, the manufacture method of the simple large-linear energy welding low-alloy high-strength steel plate of technological process; The steel plate welding quality height made from this method, crack sensitivity is low and tensile strength is high.
For achieving the above object, the technical solution used in the present invention is: the chemical ingredients and the content thereof of strand are: C is 0.01～0.18wt%, and Si is 0.05～0.60wt%, Mn is 1.50～2.50wt%, Ni is 0.10～1.50wt%, and Cu is 0.10～1.50wt%, and Als is 0.001～0.060wt%, Nb is 0.01～0.08wt%, N is 0.002～0.012wt%, and B is 0.0001～0.003wt%, P＜0.015wt%, S＜0.010wt%, ZrO
2Be 0.1～0.9wt%, all the other are Fe and unavoidable impurities.Wherein, ZrO
2Granularity be 10～50 nanometers.
The manufacturing process of this steel plate is: adopt converter or electric arc furnace that molten iron or steel scrap or molten iron are carried out refining with steel scrap after steel-making, the chemical ingredients adding alloying element according to slab carries out continuous casting and hot rolling then.
Its hot rolling technology is: earlier strand is heated to 1100～1250 ℃, hot rolling is carried out in soaking 2～4 hours again, is rolled into the thick steel plate of 20～100mm, gets final product with the online cooling of the speed of cooling of 5～25 ℃/s then.
Owing to adopt technique scheme, the present invention adds alloying element, especially adds the ZrO that granularity is the 10-50 nanometer
2Welded heat affecting zone under the large-line energy welding conditions both can be used as the nucleating agent of acicular ferrite, to stop growing up and alligatoring of austenite structure, both can be used as the nucleating agent of solidification of molten steel, not only help forming tiny as-cast structure, help again growing up and alligatoring of solidifying, organize in the rolling and welding process.
The present invention have chemical ingredients simple, be easy to control, production cost is low and characteristic of simple process.The tensile strength of manufactured steel plates is 600～1000MPa, welds under the heat input of 150～800kJ/cm, can not heat-treat after the welding, and the ballistic work of welded H AZ is not less than 2/3 of mother metal ballistic work.Therefore, this steel plate welding quality height, crack sensitivity is low, tensile strength is high, can reduce welding procedure intensity effectively, improve welding quality, reduce manufacturing cost, economize on resources and the energy, be fit to the various welding of union-melt weld, gas guarantor weldering, electro-gas welding, electroslag welding.
The steel plate of the present invention preparation is suitable for large scale structure, equipment, facilities etc. such as crude oil storage tank, building, boats and ships warship, is particularly useful for the intensity height, thickness is big and Chinese People's Anti-Japanese Military and Political College's heat input welding.
Embodiment
Below in conjunction with embodiment the present invention being further described, is not limiting the scope of the invention:
Embodiment 1
A kind of large-linear energy welding low-alloy high-strength steel plate and manufacture method thereof.The chemical ingredients and the content thereof of this strand are: C is 0.01～0.18wt%, Si is 0.05～0.60wt%, and Mn is 1.50～2.50wt%, and Ni is 0.10～1.50wt%, Cu is 0.10～1.50wt%, Als is 0.001～0.060wt%, and Nb is 0.01～0.08wt%, and N is 0.002～0.012wt%, B is 0.0001～0.003wt%, P＜0.015wt%, S＜0.010wt%, ZrO
2Be 0.10～0.40wt%, all the other are Fe and unavoidable impurities; ZrO wherein
2Granularity be 10～30 nanometers.
The manufacturing process of present embodiment 1 is: adopt converter that molten iron is carried out refining after steel-making, the chemical ingredients adding alloying element according to strand carries out continuous casting and hot rolling then.Hot rolling technology is: earlier strand is heated to 1150～1200 ℃, soaking 2.5～3.5 hours is rerolled and is made the thick steel plate of 50～70mm, then with the online cooling of the speed of cooling of 5～15 ℃/s.
The tensile strength of present embodiment 1 manufactured steel plates is 600～700MPa, can weld under the heat input of 150～800kJ/cm, need not heat-treat after the welding, and the ballistic work of welded H AZ is not less than 2/3 of mother metal ballistic work.
Embodiment 2
A kind of large-linear energy welding low-alloy high-strength steel plate and manufacture method thereof.The chemical ingredients and the content thereof of this strand are: C is 0.01～0.18wt%, Si is 0.05～0.60wt%, and Mn is 1.50～2.50wt%, and Ni is 0.10～1.50wt%, Cu is 0.10～1.50wt%, Als is 0.001～0.060wt%, and Nb is 0.01～0.08wt%, and N is 0.002～0.012wt%, B is 0.0001～0.003wt%, P＜0.015wt%, S＜0.010wt%, ZrO
2Be 0.60～0.90wt%, all the other are Fe and unavoidable impurities; ZrO wherein
2Granularity be 20～40 nanometers.
The manufacturing process of present embodiment 2 is: adopt electric arc furnace that steel scrap is carried out refining after steel-making, the chemical ingredients adding alloying element according to strand carries out continuous casting and hot rolling then.Hot rolling technology is: earlier strand is heated to 1200～1250 ℃, soaking 2.0～3.0 hours is rerolled and is made the thick steel plate of 70～100mm, gets final product with the online cooling of the speed of cooling of 15～25 ℃/s then.
The tensile strength of present embodiment 2 manufactured steel plates is 900～1000MPa, can weld under the heat input of 600～800kJ/cm, need not heat-treat after the welding, and the ballistic work of welded H AZ is not less than 2/3 of mother metal ballistic work.
Embodiment 3
A kind of large-linear energy welding low-alloy high-strength steel plate and manufacture method thereof.The chemical ingredients and the content thereof of this strand are: C is 0.01～0.18wt%, Si is 0.05～0.60wt%, and Mn is 1.50～2.50wt%, and Ni is 0.10～1.50wt%, Cu is 0.10～1.50wt%, Als is 0.001～0.060wt%, and Nb is 0.01～0.08wt%, and N is 0.002～0.012wt%, B is 0.0001～0.003wt%, P＜0.015wt%, S＜0.010wt%, ZrO
2Be 0.40～0.60wt%, all the other are Fe and unavoidable impurities; ZrO wherein
2Granularity be 30～50 nanometers.
The manufacturing process of present embodiment 3 is: adopt converter that molten iron and steel scrap are carried out refining after steel-making, the chemical ingredients adding alloying element according to strand carries out continuous casting and hot rolling then.Hot rolling technology is: earlier strand is heated to 1100～1150 ℃, soaking 3.0～4.0 hours is rerolled and is made the thick steel plate of 20～50mm, gets final product with the online cooling of the speed of cooling of 5～15 ℃/s then.
Present embodiment 3 manufactured steel plates tensile strength are 700～800MPa, can weld under the heat input of 400～600kJ/cm, need not heat-treat after the welding, and the ballistic work of welded H AZ is not less than 2/3 of mother metal ballistic work.
This embodiment have chemical ingredients simple, be easy to control, production cost is low and characteristic of simple process.The steel tensile strength of manufacturing is 600～1000MPa, welds under the heat input of 150～800kJ/cm, can not heat-treat after the welding, and the ballistic work of welded H AZ is not less than 2/3 of mother metal ballistic work.Therefore, that this steel plate is organized is tiny, welding quality is high, crack sensitivity is low, tensile strength is high, can reduce welding procedure intensity effectively, improves welding quality, reduces manufacturing cost, economizes on resources and the energy.Be fit to the various welding of union-melt weld, gas guarantor weldering, electro-gas welding, electroslag welding.Especially be suitable for low-alloy high-strengths such as the large-scale counter deck of boat and LPG hull, at the shipbuilding Plate Steel of the heat input input of 400～800kJ/cm.
This embodiment manufactured steel plates can extensively be suitable for large scale structure, equipment, facilities etc. such as crude oil storage tank, construction(al)steel, boats and ships warship, is particularly useful for the big and Chinese People's Anti-Japanese Military and Political College's heat input welding of intensity height, thickness.
Claims (3)
1. the manufacture method of a large-linear energy welding low-alloy high-strength steel plate, it is characterized in that the chemical ingredients of strand and content thereof are: C is 0.01～0.18wt%, Si is 0.05～0.60wt%, Mn is 1.50～2.50wt%, Ni is 0.10～1.50wt%, and Cu is 0.10～1.50wt%, and Als is 0.001～0.060wt%, Nb is 0.01～0.08wt%, N is 0.002～0.012wt%, and B is 0.0001～0.003wt%, P＜0.015wt%, S＜0.010wt%, ZrO
2Be 0.1～0.9wt%, all the other are Fe and unavoidable impurities; Wherein, ZrO
2Granularity be 10～50 nanometers;
The manufacturing process of this steel plate is: adopt converter or electric arc furnace that molten iron or steel scrap or molten iron are carried out refining with steel scrap after steel-making, the chemical ingredients adding alloying element according to strand carries out continuous casting and hot rolling then.
2. the manufacture method of large-linear energy welding low-alloy high-strength steel plate according to claim 1, it is characterized in that described hot rolling technology is: earlier strand is heated to 1100～1250 ℃, soaking 2～4 hours, carry out hot rolling again, be rolled into the thick steel plate of 20～100mm, get final product with the online cooling of the speed of cooling of 5～25 ℃/s then.
3. according to the large-linear energy welding low-alloy high-strength steel plate of the manufacture method manufacturing of each described large-linear energy welding low-alloy high-strength steel plate in the claim 1～2.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009100639974A CN101660094B (en) | 2009-09-15 | 2009-09-15 | Large-linear energy welding low-alloy high-strength steel plate and manufacturing method thereof |
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| CN2009100639974A CN101660094B (en) | 2009-09-15 | 2009-09-15 | Large-linear energy welding low-alloy high-strength steel plate and manufacturing method thereof |
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| CN101660094B true CN101660094B (en) | 2011-06-15 |
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| CN102337479A (en) * | 2011-10-21 | 2012-02-01 | 天津大学 | Ultrafine crystal steel suitable for cutting single-crystal diamond and preparation method thereof |
| CN102766748B (en) * | 2012-08-10 | 2013-07-24 | 江苏省沙钢钢铁研究院有限公司 | Production method of low-temperature steel plate capable of being welded by high heat input |
| CN103343284B (en) * | 2013-07-12 | 2016-07-06 | 鞍钢股份有限公司 | A kind of production method of Large Heat Input Welding Q345 level steel plate |
| CN108149150A (en) * | 2017-12-07 | 2018-06-12 | 北京科技大学 | One kind contains ZrO2Nano particle reinforced abrasion-resistant stee and preparation method |
| CN113444985B (en) * | 2021-05-24 | 2022-10-21 | 北京中永业科技有限公司 | Steel material and preparation method thereof |
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