CN103436778B - There is low-temperature flexibility flux-cored wire cold rolled strip and production method thereof - Google Patents
There is low-temperature flexibility flux-cored wire cold rolled strip and production method thereof Download PDFInfo
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- CN103436778B CN103436778B CN201310373836.1A CN201310373836A CN103436778B CN 103436778 B CN103436778 B CN 103436778B CN 201310373836 A CN201310373836 A CN 201310373836A CN 103436778 B CN103436778 B CN 103436778B
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Abstract
The invention provides one and have low-temperature flexibility flux-cored wire cold rolled strip and production method thereof, chemical composition and the mass percent of band steel are: C, 0.045-0.06%; Mn, 1.4-1.5%; Si ,≤0.04%; P ,≤0.01%; S ,≤0.005%; Als ,≤0.03%, N, 0.0020 ~ 0.0030%, surplus is Fe and inevitable impurity; Processing parameter in production is: hot rolling Heating temperature is 1230 ± 20 DEG C, and finishing temperature is 910 ± 20 DEG C, and coiling temperature is 700 ± 20 DEG C, and cold rolling draft controls at 75-80%, and annealing temperature controls at 780 ± 10 DEG C, and smooth unit elongation is 0.9%.One provided by the invention has low-temperature flexibility flux-cored wire cold rolled strip and production method thereof, the band steel produced has higher low-temperature flexibility, low yield strength and high-elongation, high forming property, can meet the requirement of low temperature storage tank (≤-30 DEG C) and boats and ships medication core welding wire steel.
Description
Technical field
The invention belongs to metal material processing field, particularly one has low-temperature flexibility flux-cored wire cold rolled strip and production method thereof.
Background technology
Flux-cored wire is a kind of novel welding material, has obtained apply widely in industrially developed country, the welding wire that to be low-carbon cold rolling band steel formed by drawing after being shaped, filling solder flux medicinal powder. in recent years, the production of China's flux-cored wire obtains and develops faster.Flux-cored wire has the advantage of high benefit, low cost, high quality, automatization, each side such as splashing is little, shaping is good, be widely used in shipbuilding, metallurgy, petrochemical industry and machine-processed industry, especially at shipbuilding industry, flux-cored wire has replaced manual electrode and solid welding wire, becomes the welding material that consumption is maximum.Smelt in prior art the flux-cored wire cold-rolled steel sheet that obtains due to Composition Control reasonable not, P, S content is higher, and band steel has the shortcoming of low-temperature flexibility difference and forming property difference.
Summary of the invention
Technical problem to be solved by this invention be to provide a kind of composition rationally, there is flux-cored wire cold rolled strip and the production method thereof of the high and favorable forming property of low-temperature flexibility.
For solving the problems of the technologies described above, the invention provides one and have low-temperature flexibility flux-cored wire cold rolled strip, its chemical composition and mass percent are: C, 0.045-0.06%; Mn, 1.4-1.5%; Si ,≤0.04%; P ,≤0.01%; S ,≤0.005%; Als ,≤0.03%, N, 0.0020 ~ 0.0030%, surplus is Fe and inevitable impurity.
Have in low-temperature flexibility flux-cored wire cold rolled strip provided by the invention, the mechanism of action of coherent element and the determination reason of composition range as follows:
1) provided by the invention have in the chemical composition of low-temperature flexibility flux-cored wire steel, the content of C is 0.045-0.06%, Mn content is 1.4-1.6%, C element adds in weld metal mainly as strengthening element, it significantly improves intensity and the hardness of weld metal, the formation of acicular ferrite can be impelled, and reduce grain boundary ferrite, the hardness of deposited metal is increased.The acquisition of optimum tenacity is that C is 0.04% ~ 0.07%.Along with the ratio of the increase acicular ferrite of C content increases, C is comparatively large on the impact of the structure and properties of deposited metal as main alloying element, increase within the specific limits C content to toughness and intensity all useful.But carbon content more than 0.10% after, low-temperature impact toughness declines rapidly.In sum, in order to ensure that weld metal has good low-temperature flexibility, must the strict carbon content controlled in weld metal.Mn is one of main alloy element of proof strength, and this element can reduce the transition temperature of C → A effectively, suppresses the formation of crystal boundary proeutectoid ferrite, impels in weld seam and form acicular ferrite structure.Its optimum content scope is 1.4%-1.6%, can effectively suppress crystal boundary proeutectoid ferrite and ferrite side plate within the scope of 0.6%-1.6%, and the ratio of acicular ferrite is improved, and obtains very high toughness.Along with the increase of w (M n)/w (C), toughness decreases, and therefore, must consider the reasonable disposition of C and M n in alloy system, just can ensure the acquisition of high tenacity.
2) S, P are as impurity element, weld metal plasticity and toughness and Properties of HIC resistance can be made to reduce, therefore will strictly control its content in weld seam, control at S≤0.005%, P≤0.01% in the present invention.
Present invention also offers a kind of production method with low-temperature flexibility flux-cored wire cold rolled strip, comprise the steps:
1) by chemical composition and mass percent be: C, 0.045-0.06%; Mn, 1.4-1.5%; Si ,≤0.04%; P ,≤0.01%; S ,≤0.005%; Als ,≤0.03%, N, 0.0020 ~ 0.0030%, surplus is that the steel of Fe and inevitable impurity carries out desulfurization, bessemerizes, RH vacuum refinement, continuous casting obtain continuous casting steel billet;
2) continuous casting steel billet is heated to 1230 ± 20 DEG C, carries out hot rolling, temperature during finish to gauge controls at 910 ± 20 DEG C, and batches at the temperature of 700 ± 20 DEG C, obtains coils of hot-rolled steel;
3) by cold rolling after coils of hot-rolled steel uncoiling pickling, cold rolling draft controls, at 75-80%, to obtain cold-rolled steel sheet;
4) by cold-rolled steel sheet continuous annealing in the temperature range of 780 ± 10 DEG C, rapid cooling temperature out controls, at 430 ± 10 DEG C, to adopt flattening process after annealing, and smooth unit elongation is 0.9%, obtains cold rolled strip.
Provided by the invention have in the production method of low-temperature flexibility flux-cored wire cold rolled strip, adopts higher cold rolling draft and high annealing temperature, is beneficial to { the formation of 111} texture in the recrystallize after cold roller and deformed and annealing process; Balance annealing soak temperature is adopted in continuous annealing process, avoid excessive grain thick, keep a certain amount of Carbide Precipitation to strengthen crystal boundary, reduce rapid cooling section temperature out simultaneously, ensure in process of cooling, increase the bonding force of tiny second-phase at crystal boundary, anti-secondary processing brittleness ability improves, and smooth elongation control, 0.9%, can eliminate the yield point elongation of product, prevent product from punching course, occurring Lüders bands, and improve the ageing resistance performance of product.
Provided by the invention have low-temperature flexibility flux-cored wire cold rolled strip and production method thereof, by optimizing Composition Design, adjusting and optimizing hot rolling, cold rolling and parameter and annealing, flattening technological parameter, producing the flux-cored wire steel with low-temperature flexibility.By adjustment C, Mn, P, S content on the basis be optimized techniques such as hot rolling, cold rolling and continuous annealings, the cold rolled annealed steel plate produced has low-temperature flexibility, has good forming property simultaneously.Improve quality product, bring considerable economic benefit to enterprise.
Accompanying drawing explanation
The metallographic microstructure photo with low-temperature flexibility flux-cored wire cold rolled strip that Fig. 1 provides for the embodiment of the present invention 1.
Embodiment
The one that the embodiment of the present invention provides has low-temperature flexibility flux-cored wire cold rolled strip, and its chemical composition and mass percent are: C, 0.045-0.06%; Mn, 1.4-1.5%; Si ,≤0.04%; P ,≤0.01%; S ,≤0.005%; Als ,≤0.03%, N, 0.0020 ~ 0.0030%, surplus is Fe and inevitable impurity.
A kind of production method with low-temperature flexibility flux-cored wire cold rolled strip provided by the invention, comprises the steps:
1) by chemical composition and mass percent be: C, 0.045-0.06%; Mn, 1.4-1.5%; Si ,≤0.04%; P ,≤0.01%; S ,≤0.005%; Als ,≤0.03%, N, 0.0020 ~ 0.0030%, surplus is that the steel of Fe and inevitable impurity carries out desulfurization, bessemerizes, RH vacuum refinement, continuous casting obtain continuous casting steel billet;
2) continuous casting steel billet is heated to 1230 ± 20 DEG C, carries out hot rolling, temperature during finish to gauge controls at 910 ± 20 DEG C, and batches at the temperature of 700 ± 20 DEG C, obtains coils of hot-rolled steel;
3) by cold rolling after coils of hot-rolled steel uncoiling pickling, cold rolling draft controls, at 75-80%, to obtain cold-rolled steel sheet;
4) by cold-rolled steel sheet continuous annealing in the temperature range of 780 ± 10 DEG C, slow cooling velocity of discharge controls at 660 ± 10 DEG C, rapid cooling temperature out controls at 430 ± 10 DEG C, overaging temperature controls at 370 ± 10 DEG C, cold temperature out 170 DEG C eventually, adopt flattening process after annealing, smooth unit elongation is 0.9%, obtains cold rolled strip.
Below in conjunction with embodiment 1-5, the invention will be further described.
Table 1 is the chemical composition (mass percent) of embodiment 1-5, and surplus is Fe and inevitable impurity.
Table 1
According to the design requirements of steel grades of the present invention, adopt desulfurizing iron, bessemerize, RH vacuum refinement, continuous casting obtains continuous casting steel billet.
Continuous casting steel billet is after process furnace heating, and rolling on Continuous Heat tandem rolling mill, and controlled cooling model, then batch, and produces qualified coils of hot-rolled steel.
By coils of hot-rolled steel again uncoiling after the iron scale that overpickling washes surface off, cold continuous rolling carries out cold rolling, control cold rolling draft, obtain cold-rolled steel sheet;
By cold-rolled steel sheet continuous annealing in continuous annealing furnace, adopt flattening process after annealing, after smooth, obtain cold rolled strip.
Embodiment 1-5 is producing related process parameters corresponding in flux-cored wire cold rolled strip process in table 2.
Table 2
The mechanical property of the flux-cored wire cold rolled strip that above-described embodiment 1-5 produces, as shown in table 3.
Table 3
From table 3, the mechanical property of the flux-cored wire cold rolled strip that embodiment 1-5 obtains, can find out, the steel plate produced has higher low-temperature flexibility (shock absorption energy A
kv>=100J), low yield strength (ReL≤240MPa), high-elongation (A50%>=40), high forming property (r value>=1.5) can meet the requirement of low temperature storage tank (≤-30 DEG C) and boats and ships medication core welding wire steel.
See Fig. 1, from the metallographic microstructure photo with low-temperature flexibility flux-cored wire cold rolled strip that the embodiment of the present invention 1 provides, the metallographic structure of band steel is typical ferrite equi-axed crystal, grain fineness number is 10 grades, crystal grain is dispersed with the cementite particle of disperse, and the block perlite of a small amount of intercrystalline precipitation.
It should be noted last that, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to example to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (2)
1. have a low-temperature flexibility flux-cored wire cold rolled strip, it is characterized in that, its chemical composition and mass percent are: C, 0.047-0.06%; Mn, 1.4-1.55%; Si ,≤0.04%; P ,≤0.01%; S ,≤0.005%; Als ,≤0.03%, N, 0.0020 ~ 0.0030%, surplus is Fe and inevitable impurity, and the mechanical property of described cold rolled strip is: shock absorption energy A
kv>=100J, ReL≤240MPa, A50%>=40, r value>=1.5.
2. a production method with low-temperature flexibility flux-cored wire cold rolled strip according to claim 1, is characterized in that, comprise the steps:
1) steel of described chemical composition and mass percent carried out desulfurization, bessemerize, RH vacuum refinement, continuous casting obtain continuous casting steel billet;
2) continuous casting steel billet is heated to 1230 ± 20 DEG C, carries out hot rolling, temperature during finish to gauge controls at 910 ± 20 DEG C, and batches at the temperature of 700 ± 20 DEG C, obtains coils of hot-rolled steel;
3) by cold rolling after coils of hot-rolled steel uncoiling pickling, cold rolling draft controls, at 75-80%, to obtain cold-rolled steel sheet;
4) by cold-rolled steel sheet continuous annealing in the temperature range of 780 ± 10 DEG C, rapid cooling temperature out controls, at 430 ± 10 DEG C, to adopt flattening process after annealing, and smooth unit elongation is 0.9%, obtains cold rolled strip.
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| CN103667877B (en) * | 2013-12-16 | 2015-12-02 | 天津钢铁集团有限公司 | A kind of Production method for wire rod for steel wool |
| CN104263901A (en) * | 2014-09-19 | 2015-01-07 | 北京首钢冷轧薄板有限公司 | Cold-rolled strip steel continuous annealing production system and method for refrigerated welded pipes as well as strip steel and welded pipes |
| KR101795970B1 (en) * | 2016-10-11 | 2017-11-09 | 주식회사 포스코 | Cold-rolled steel sheet for flux cored wire and manufacturing the same |
| CN113802079A (en) * | 2021-08-18 | 2021-12-17 | 马钢(合肥)板材有限责任公司 | Method for producing aluminum-plated silicon steel strip with high surface quality |
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| CN101701318B (en) * | 2009-11-27 | 2011-02-09 | 武汉钢铁(集团)公司 | Steel for flux-cored wire jacket and manufacturing method thereof |
| CN102021295B (en) * | 2010-12-21 | 2012-10-03 | 山东钢铁股份有限公司 | Cold-rolling steel belt for flux-cored wire and manufacture method thereof |
| CN102416404B (en) * | 2011-09-21 | 2014-05-28 | 首钢总公司 | Method for producing cold-rolled steel strips |
| CN102676917B (en) * | 2012-05-09 | 2013-09-25 | 首钢总公司 | Preparation method of cold-rolled sheet for flux-cored wire |
| CN102755992B (en) * | 2012-07-30 | 2015-08-12 | 武汉钢铁(集团)公司 | A kind of flux-cored wire cold-rolled strip production method |
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Address after: 100041 Shijingshan Road, Beijing, No. 68, No. Patentee after: Shougang Group Co. Ltd. Address before: 100041 Shijingshan Road, Beijing, No. 68, No. Patentee before: Capital Iron & Steel General Company |
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