CN103243259A - Thin rare earth-containing hot rolled steel plate for enamel liner of water heater, and production method of steel plate - Google Patents
Thin rare earth-containing hot rolled steel plate for enamel liner of water heater, and production method of steel plate Download PDFInfo
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- CN103243259A CN103243259A CN2013101501474A CN201310150147A CN103243259A CN 103243259 A CN103243259 A CN 103243259A CN 2013101501474 A CN2013101501474 A CN 2013101501474A CN 201310150147 A CN201310150147 A CN 201310150147A CN 103243259 A CN103243259 A CN 103243259A
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Abstract
The invention relates to a thin rare earth-containing hot rolled steel plate for an enamel liner of a water heater, and a production method of the steel plate. The material of the steel plate comprises the following chemical components in percentage by weight: 0.02 to 0.05 percent of C, 0.015 to 0.50 percent of Si, 0.10 to 0.20 percent of Mn, less than or equal to 0.030 percent of P, less than or equal to 0.025 percent of S, more than or equal to 0.015 percent of Alt, less than or equal to 0.01 percent of Re and the balance of Fe and inevitable impurities. The tissue of the steel plate comprises ferrite and a small amount of pearlite. According to the steel plate, the yield strength is more than 230 Mpa, the tensile strength is more than 320 Mpa and the extension rate is more than 45 percent. The heating temperature is 1,080 to 1,150 DEG C, the initial rolling temperature is 1,050 to 1,100 DEG C, the finishing rolling temperature is 860 to 890 DEG C, the reeling temperature is 550 to 600 DEG C, the total press-down rate of rolling is more than or equal to 85 percent, and rolling is performed in a dispersing and cooling form. The thin rare earth-containing hot rolled steel plate disclosed by the invention has the advantages that the trace element Re is added on the basis of C-Mn steel, and a controlled rolling and controlled cooling technology is adopted, so the cost performance is high, the cost is low, and the performance completely accords with the requirements of the thin steel plate for the enamel liner.
Description
Technical field
The present invention relates to a kind of enamel internal container of water-heater and contain rare earth hot-rolled steel sheet and production method with thin specification, belong to metallurgical steel rolling field.
Background technology
Along with the development and progress of society and the people eternal continuous pursuit to U.S., enameling sheet is as the novel high-grade material.Be the steel sheet user who is only second to automobile industry, it has acid-fast alkali-proof, corrosion-and high-temp-resistant, fire prevention is antirust, color is various, prolongedly do not take off, sanitation and hygiene are convenient to washing, distinct advantages such as not easy to wear, add that it does not absorb oil smoke gas and moisture, ought to occupy advantageous position at aspects such as Kitchen hygiene, household electrical appliance, urban public utilities.Because enamel internal container of water-heater is had relatively high expectations to product performance with thin specification steel plate, existing enamel internal container of water-heater is expensive cold-rolled products with thin specification steel plate.
Summary of the invention
The purpose of this invention is to provide a kind of high performance-price ratio, enamel internal container of water-heater contains rare earth hot-rolled steel sheet and production method with thin specification cheaply.This steel adds the Re trace element at C-Mn base steel plinth, adopts the controlled rolling and controlled cooling technology, can produce enamel internal container of water-heater and contain the rare earth hot-rolled steel sheet with thin specification.Rare earth Re(norium cored-wire) adding makes the interior rusty scale densification of steel, and with the bonding force grow of matrix, be difficult for breaking away from, can stop the diffusion of atmosphere neutralization, thereby reduce corrosion speed.Improved the processing characteristics of steel greatly and improved its work-ing life.
Purpose of the present invention can realize by following measure:
Enamel internal container of water-heater of the present invention contains the rare earth hot-rolled steel sheet with thin specification, the stoicheiometry component of material is (weight %) C:0.02～0.05%, Si:0.015～0.50%, Mn:0.10～0.20%, P≤0.030%, S≤0.025%, Alt 〉=0.015%, Re≤0.01%, all the other inevitably are mingled with for Fe reaches; Be organized as ferrite+a small amount of perlite; The yield strength of described steel plate is greater than 230Mpa, and tensile strength is greater than 320Mpa, and unit elongation is greater than 45%.
Produce described enamel internal container of water-heater and contain the method for rare earth hot-rolled steel sheet with thin specification, as follows:
(1) adopt 1080～1150 ℃ of Heating temperatures, start rolling temperature is 1030～1100 ℃, and finishing temperature is 860～890 ℃;
(2) adopt rolling total draft 〉=85%, adopt every the component laminar flow methods for cooling that scatters;
(3) coiling temperature is 550～600 ℃.
The present invention has following advantage compared to existing technology:
In today of market cut-throat competition, low-cost high repayment becomes criterion and the target that each businessman is pursued, and reaching under the situation of product requirement, replaces expensive cold-rolled products with low-cost hot-rolled sheet.Use the present invention and can obtain to reduce cost, simplify Production Flow Chart, enhance productivity, reduce economic benefit and social benefits such as energy consumption, meet the developing direction of exploitation saving type, the green iron and steel of lustration type.Be specially:
1. the present invention adheres to producing cheaply route, adds the Re trace element in the C-Mn steel, not only reduces cost, economizes on resources, and improve the product over-all properties.
2. the present invention adopts Clean Steel smelting technology cheaply, simplifies technology, cuts down the consumption of energy.Take single-slag operation, strengthen subsequent control measures such as quick slagging, the basicity of controlling slag and pushing off the slag tapping and reduce P content in the molten steel, thereby shorten the production cycle and improved economic benefit, take off S and mainly in the LF refining process, carry out, by heated by electrodes and make white slag and carry out desulfurization.S makes steel plate produce fragility, thereby reduces extensibility and the deep drawing quality of steel plate.Sulphur and oxygen knot platform generates SO when enamel firing
2, cause enamel coating defectives such as various abscesses, pin hole to occur.Easily cause segregation when sulphur content is higher, at this moment metallographic shows as zonal structure, and causes the physicals of steel plate and each opposite sex of mechanical property, makes enamelware in process of cooling, the contraction difference of different directions, thus cause product surface burst porcelain and squama quick-fried.Molten steel carries out Ca to be handled, and Ca makes the MnS inclusion rotten, has eliminated the harm of S in steel.Carry out calcium after the LF refining and handle, feed the norium cored-wire after calcium is handled.
3. the present invention is by controlled rolling and control process for cooling, realizes that water heater porcelain enamel contains the stably manufactured of rare earth hot-rolled steel sheet with thin specification, simplifies production technique, enhances productivity the minimizing energy consumption.Mainly be: adopt 1080～1150 ℃ of Heating temperatures, start rolling temperature is 1030～1100 ℃, and finishing temperature is 860～890 ℃; Rolling total draft 〉=85% adopts every the component laminar flow methods for cooling that scatters; Coiling temperature is 550～600 ℃.Can guarantee the steel plate yield strength greater than 230Mpa, tensile strength is greater than 320Mpa, and unit elongation is greater than 45%.
Embodiment
In conjunction with example enamel internal container of water-heater being contained rare earth hot-rolled steel sheet and production method and production method thereof with thin specification is described in further detail:
Table 1 is listed the present invention contains the rare earth hot-rolled steel sheet with thin specification for the production of enamel internal container of water-heater chemical ingredients.Production method is as follows: adopt low desulfurization, converter smelting, the refining of LF stove, calcium to handle, feed the norium cored-wire in steel-making, make chemical ingredients in the steel shown in table 1, surplus is Fe and unavoidable impurities.
The chemical ingredients of table 1 steel of the present invention, wt%
| Sequence number | C | Si | Mn | P | S | Alt | Re |
| 1 | 0.028? | 0.025? | 0.14? | 0.012? | 0.006? | 0.031 | ≤0.01 |
| 2 | 0.036? | 0.026? | 0.15? | 0.015? | 0.004? | 0.032 | ≤0.01 |
| 3 | 0.047? | 0.016? | 0.12? | 0.010? | 0.003? | 0.027 | ≤0.01 |
Controlled rolling and controlled cooling mainly is the careful and precise cooling controlling and rolling controlling process parameter of branch specification, comprising: (1) austenite recrystallization district start rolling temperature is 1040～1060 ℃, (2) rolling total draft 〉=87%, 860～890 ℃ of finishing temperatures.(3) adopt every the component laminar flow methods for cooling pattern of scattering and cool off, control speed of cooling and intensity realize ferrite+a small amount of perlite,
Enamel internal container of water-heater of the present invention is listed in table 2 with the experimental result that thin specification contains the rare earth hot-rolled steel sheet, and therefrom the yield strength of steel plate is greater than 240 MPa as can be seen, and tensile strength is greater than 335MPa, and unit elongation is greater than 48%.
The experimental result of table 2 steel of the present invention
| Sequence number | Yield strength (MPa) | Tensile strength (MPa) | Unit elongation (%) |
| 1 | 275? | 350? | 50.5? |
| 2 | 275? | 350? | 51.5? |
| 3 | 275? | 355? | 52.0? |
| 4 | 275? | 355? | 52.5? |
| 5 | 240? | 335? | 48.5? |
| 6 | 250? | 340? | 48.5? |
Claims (2)
1. an enamel internal container of water-heater contains the rare earth hot-rolled steel sheet with thin specification, it is characterized in that: the stoicheiometry component of material is (weight %) C:0.02～0.05%, Si:0.015～0.50%, Mn:0.10～0.20%, P≤0.030%, S≤0.025%, Alt 〉=0.015%, Re≤0.01%, all the other inevitably are mingled with for Fe reaches; Be organized as ferrite+a small amount of perlite; The yield strength of described steel plate is greater than 230Mpa, and tensile strength is greater than 320Mpa, and unit elongation is greater than 45%.
2. an enamel internal container of water-heater according to claim 1 contains the production method of rare earth hot-rolled steel sheet with thin specification, it is characterized in that: adopt 1080～1150 ℃ of Heating temperatures, start rolling temperature is 1050～1100 ℃, finishing temperature is 860～890 ℃, coiling temperature is 550～600 ℃, rolling total draft 〉=85% disperses methods for cooling to roll.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013101501474A CN103243259A (en) | 2013-04-26 | 2013-04-26 | Thin rare earth-containing hot rolled steel plate for enamel liner of water heater, and production method of steel plate |
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| CN2013101501474A CN103243259A (en) | 2013-04-26 | 2013-04-26 | Thin rare earth-containing hot rolled steel plate for enamel liner of water heater, and production method of steel plate |
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| CN103243259A true CN103243259A (en) | 2013-08-14 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104419874A (en) * | 2013-09-05 | 2015-03-18 | 鞍钢股份有限公司 | Hot rolled double-faced enamel steel with excellent fish scaling resistance and manufacture method of hot rolled double-faced enamel steel |
| CN106637208A (en) * | 2016-09-23 | 2017-05-10 | 广东康业电器有限公司 | Production process for A3 steel plate enamel piece |
| CN112375971A (en) * | 2020-10-21 | 2021-02-19 | 包头钢铁（集团）有限责任公司 | Low-cost cold-rolled low-carbon enamel steel and manufacturing method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50152920A (en) * | 1974-05-30 | 1975-12-09 | ||
| JPS5112322A (en) * | 1974-07-23 | 1976-01-30 | Kawasaki Steel Co | Horoyo al kirudokohan |
| JPH02235551A (en) * | 1989-03-09 | 1990-09-18 | Nippon Steel Corp | Production of steel sheet for enamel made by continuous casting having excellent resistance to surface breakage |
| CN101812630A (en) * | 2009-02-25 | 2010-08-25 | 宝山钢铁股份有限公司 | Hot-rolling high-strength enamel sheet for deep drawing and manufacturing method thereof |
| CN102181805A (en) * | 2011-04-07 | 2011-09-14 | 河北钢铁股份有限公司唐山分公司 | Steel plate and method thereof used for producing water heater linear enamel by flexible thin slab rolling line |
-
2013
- 2013-04-26 CN CN2013101501474A patent/CN103243259A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50152920A (en) * | 1974-05-30 | 1975-12-09 | ||
| JPS5112322A (en) * | 1974-07-23 | 1976-01-30 | Kawasaki Steel Co | Horoyo al kirudokohan |
| JPH02235551A (en) * | 1989-03-09 | 1990-09-18 | Nippon Steel Corp | Production of steel sheet for enamel made by continuous casting having excellent resistance to surface breakage |
| CN101812630A (en) * | 2009-02-25 | 2010-08-25 | 宝山钢铁股份有限公司 | Hot-rolling high-strength enamel sheet for deep drawing and manufacturing method thereof |
| CN102181805A (en) * | 2011-04-07 | 2011-09-14 | 河北钢铁股份有限公司唐山分公司 | Steel plate and method thereof used for producing water heater linear enamel by flexible thin slab rolling line |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104419874A (en) * | 2013-09-05 | 2015-03-18 | 鞍钢股份有限公司 | Hot rolled double-faced enamel steel with excellent fish scaling resistance and manufacture method of hot rolled double-faced enamel steel |
| CN106637208A (en) * | 2016-09-23 | 2017-05-10 | 广东康业电器有限公司 | Production process for A3 steel plate enamel piece |
| CN112375971A (en) * | 2020-10-21 | 2021-02-19 | 包头钢铁（集团）有限责任公司 | Low-cost cold-rolled low-carbon enamel steel and manufacturing method thereof |
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Application publication date: 20130814 |