CN115318831A - Method for producing welded bottle steel by endless rolling - Google Patents

Method for producing welded bottle steel by endless rolling Download PDF

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Publication number
CN115318831A
CN115318831A CN202211041488.3A CN202211041488A CN115318831A CN 115318831 A CN115318831 A CN 115318831A CN 202211041488 A CN202211041488 A CN 202211041488A CN 115318831 A CN115318831 A CN 115318831A
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rolling
less
equal
steel
percent
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CN202211041488.3A
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Chinese (zh)
Inventor
张斌
刘丹
薛洪涛
王晓林
田茂广
祝传春
丁宁
刘洪磊
孙向阳
顼鑫
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Rizhao Steel Holding Group Co Ltd
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Rizhao Steel Holding Group Co Ltd
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Priority to CN202211041488.3A priority Critical patent/CN115318831A/en
Publication of CN115318831A publication Critical patent/CN115318831A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
    • B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
    • B21B3/02—Rolling special iron alloys, e.g. stainless steel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)
  • Metal Rolling (AREA)

Abstract

The invention discloses a method for producing welding bottle steel by headless rolling, which belongs to the field of steel production and comprises the steps of continuous casting → rough rolling → induction heating → finish rolling → cooling and coiling; the continuous casting billet comprises the following chemical components in percentage by weight: c: less than or equal to 0.06 percent, si:0.09 to 0.25%, mn: less than or equal to 1.3 percent, S: less than or equal to 0.006 percent, P: less than or equal to 0.015 percent, alt: not less than 0.020%, and the balance of Fe and inevitable impurities; the rough rolling outlet temperature is 960-1010 ℃; the temperature of an induction heating outlet is 1060-1120 ℃; the finish rolling temperature is 780-830 ℃; taking out of the rapid cooling mode after finish rolling, and controlling the coiling temperature to be 480-520 ℃. Compared with the prior art, the punching forming performance and the welding performance of the welding bottle steel are optimized.

Description

Method for producing welded bottle steel by endless rolling
Technical Field
The invention relates to a steel production process, in particular to a production method suitable for producing welding bottle steel by endless rolling.
Background
Liquefied petroleum gas is a flammable and explosive substance, and the quality of liquefied petroleum gas cylinders and tanks directly influences the life and property safety of people. The steel plate for the welded gas cylinder is formed into a liquefied petroleum gas cylinder and a liquefied petroleum gas tank for storing liquefied gas after punch forming and welding processing.
In the prior art, in order to improve the strength and the elongation of the material, the content of C is higher, generally 0.12-0.18%, for example, the components of the Chinese invention, namely a strip steel production method for improving the cup shape uniformity of a welded steel bottle (CN 201510183706.0), are C:0.14% -0.17%, si: less than or equal to 0.05 percent, mn:0.8% -1.0%, P: less than or equal to 0.015%, S: less than or equal to 0.005%, als:0.015% -0.035%, ti:0.01 to 0.02 percent. However, as the content of C increases, the press formability and weldability of the steel deteriorate, which is disadvantageous in avoiding the peritectic region and improving the press formability. Therefore, in order to enhance formability and weldability, the Si content has to be reduced, but Si has a good deoxidizing effect, suppresses iron sheet intrusion at high temperatures, and increases elasticity, heat resistance, acid resistance, resistivity, and the like of steel.
Therefore, on the basis of ensuring the steel strength, the method further reduces the content of C, optimizes the stamping forming performance and the welding performance of the steel for welding bottles and reduces the surface quality defects caused by the low-carbon steel scale, thereby becoming a great difficulty in the field.
Disclosure of Invention
The technical task of the invention is to provide a method for producing the welded steel bottle by endless rolling aiming at the defects of the prior art, and further optimize the punching forming performance and the welding performance of the welded steel bottle.
The technical scheme for solving the technical problem is as follows: a method for producing welding bottle steel by endless rolling is characterized in that: the method comprises the following steps: continuous casting → rough rolling → induction heating → finish rolling → cooling and coiling; wherein:
s1, continuous casting: the thickness of the obtained casting blank is 70-110 mm; the continuous casting billet comprises the following chemical components in percentage by weight: c: less than or equal to 0.06 percent, si:0.09 to 0.25%, mn: less than or equal to 1.3 percent, S: less than or equal to 0.006%, P: less than or equal to 0.015 percent, alt: not less than 0.020%, and the balance of Fe and inevitable impurities;
s2, rough rolling: after three-frame continuous rolling, rolling the steel plate to an intermediate billet with the thickness of 12.0-20.0 mm; the rough rolling outlet temperature is 960-1010 ℃;
s3, induction heating: heating by an induction heating furnace, wherein the outlet temperature is 1060-1120 ℃;
s4, finish rolling: adopting five frames for continuous rolling, wherein the finish rolling temperature is 780-830 ℃;
s5, cooling and coiling: the cooling process adopts a rapid cooling mode after finish rolling, laminar cooling is carried out on boiled water from the first group of cooling headers, the valve opening proportion is 100%, and the coiling temperature is controlled to be 480-520 ℃.
Further, in the continuous casting step, the degree of superheat is controlled to be 12 to 25 ℃.
Furthermore, in the continuous casting process, the fluctuation of the liquid level is controlled to be less than or equal to 2.0mm.
Furthermore, the chemical components of the continuous casting billet comprise 0.03-0.06% of C, 0.8-1.30% of Mn, alt: 0.020-0.05%.
Further, in the rough rolling, three-stand continuous rolling is performed.
Further, in the rough rolling, five-stand continuous rolling is adopted.
Further, the thickness is rolled to be 1.5-3.5 mm.
Compared with the prior art, the invention has the following outstanding beneficial effects:
1. the invention overcomes the technical defect that the low C of the prior art for welding the bottle steel can not ensure the strength, and stably achieves the following comprehensive properties: the yield strength is more than or equal to 300MPa, the tensile strength is 420-480 MPa, and the elongation A is more than or equal to 40 percent;
2. the welding property and the deep drawing property of the produced welded bottle steel product meet the product standard requirements;
3. the surface quality is good, and the steel surface has no strip spot or black spot iron scale defects.
Detailed Description
The present invention will be further described with reference to the following embodiments.
For the purposes of the following detailed description, it is to be understood that the invention may assume various alternative variations and step sequences, except where expressly specified to the contrary. Moreover, other than in any operating examples, or where otherwise indicated, all numbers expressing, for example, quantities of ingredients used in the specification and claims are to be understood as being modified in all instances by the term "about". At the very least, and not as an attempt to limit the application of the doctrine of equivalents to the scope of the claims, each numerical parameter should at least be construed in light of the number of reported significant digits and by applying ordinary rounding techniques.
Notwithstanding that the numerical ranges and parameters setting forth the broad scope of the invention are approximations, the numerical values set forth in the specific examples are reported as precisely as possible. Any numerical value, however, inherently contains certain errors necessarily resulting from the standard deviation found in their respective testing measurements.
It should also be understood that any numerical range recited herein is intended to include all sub-ranges subsumed therein. For example, a range of "1 to 10" is intended to include all sub-ranges between (and including) the recited minimum value of 1 and the recited maximum value of 10, that is, having a minimum value equal to or greater than 1 and a maximum value of equal to or less than 10.
In this application, the use of the singular includes the plural and plural encompasses singular, unless specifically stated otherwise. In addition, in this application, the use of "or" means "and/or" unless explicitly stated otherwise, even though "and/or" may be explicitly used in some cases. Further, in this application, the use of "a" or "an" means "at least one" unless specifically stated otherwise. For example, "a" first material, "a" coating composition, and the like refer to one or more of any of these items.
The invention provides a control method for producing welded bottle steel based on a headless rolling process.
The chemical components by weight percentage are as follows: c: less than or equal to 0.06 percent, si:0.09 to 0.25%, mn: less than or equal to 1.3 percent, S: less than or equal to 0.006 percent, P: less than or equal to 0.015 percent, alt: not less than 0.020%, and the balance of Fe and inevitable impurities.
Wherein, in the optimized proposal, the C is 0.03 to 0.06 percent, the Mn is 0.8 to 1.30 percent, the Alt: 0.020-0.05%.
The components are characterized by low C design and reasonable C, si configuration, wherein:
c is an important element for improving the strength and the elongation of the material, but the stamping forming performance and the welding performance of the steel are deteriorated along with the increase of the content of C, the coefficient of C in a welding crack sensitivity index formula of the steel in GB/T714 is 1 and is far higher than 1/30 of Si and 1/20 of Mn, meanwhile, the content of C is in direct proportion correlation with the amount of carburized body, the toughness of the carburized body is almost 0, the brittleness is extremely high, and therefore, in order to improve the stamping forming performance, the design of low-C component is adopted, and the mass percent of C is 0.03-0.06%.
Si has a good deoxidation effect, and meanwhile, the iron sheet can be inhibited from being pressed in at high temperature by proper Si content, and the Si content is 0.09-0.25%.
Mn solid solution strengthening improves the strength of steel, weakens and eliminates the adverse effect of sulfur, but excessively high Mn solid solution strengthening can coarsen crystal grains, so that the Mn solid solution strengthening accounts for 0.8 to 1.3 percent of the raw material.
The method comprises the following steps: continuous casting → rough rolling → induction heating → finish rolling → cooling and coiling.
The method specifically comprises the following steps:
s1, continuous casting:
the degree of superheat is controlled to be 12-25 ℃, the soft reduction technology is adopted, the fluctuation of the liquid level is controlled to be less than or equal to 2.0mm, and the thickness of the casting blank is 70-110 mm.
The continuous casting billet comprises the following chemical components in percentage by weight: c: less than or equal to 0.06%, si:0.09 to 0.25%, mn: less than or equal to 1.3 percent, S: less than or equal to 0.006 percent, P: less than or equal to 0.015 percent, alt: not less than 0.020%, and the balance of Fe and inevitable impurities.
S2, rough rolling:
after three-frame continuous rolling, rolling the steel plate to an intermediate billet with the thickness of 12.0-20.0 mm;
the rough rolling outlet temperature is 960-1010 ℃;
s3, induction heating
Heating the mixture in an induction heating furnace at an outlet temperature of 1060-1120 ℃.
S4, finish rolling:
adopting five frames for continuous rolling, and rolling the thickness to 1.5-3.5 mm;
the finish rolling temperature is 780-830 ℃.
S5, cooling and coiling:
the cooling process adopts a rapid cooling mode after finish rolling, laminar cooling is carried out on boiled water from the first group of cooling headers, the valve opening proportion is 100 percent, the coiling temperature is controlled to be 480-520 ℃, and coiling is carried out after shearing by a high-speed flying shear.
Therefore, in combination with the quality requirement of the steel welded in the bottle and the characteristics of a endless rolling production line, a C-reducing and Si-extracting component system is designed, the punch forming performance and the welding performance of the steel are improved, and the material strength is ensured to meet the standard requirement by combining controlled rolling and cooling measures such as low-temperature rolling, low-temperature coiling process grain refinement and the like
To better compare the present application with the prior art, comparative tests were performed.
Examples 1-4 are the composition design and production processes of the present application.
The control group 1 adopts the component design in high-stability low-yield-ratio hot-rolled welded bottle steel and the production method thereof (CN 202111252560.2).
The control group 2 was designed with the C content of the prior art (0.13-0.16 wt%), and the rest was in the same range as the present application.
The production process of the comparison group 1-2 is hot continuous rolling, and the steps comprise: continuous casting → heating of a plate blank → rough rolling → finish rolling → cooling and coiling. .
1. Designing each component:
element(s) C Si Mn P S Alt
Example 1 0.046 0.18 0.94 0.011 0.004 0.038
Example 2 0.051 0.19 1.02 0.010 0.003 0.036
Example 3 0.047 0.18 1.23 0.012 0.003 0.036
Example 4 0.045 0.21 1.01 0.011 0.004 0.039
Control group 1 0.134 0.04 1.01 0.012 0.003 0.032
Control group 2 0.150 0.19 1.15 0.012 0.004 0.038
2. See table below for various sets of production parameter control:
Figure BDA0003820713850000061
the comparison results are shown in the following table:
Figure BDA0003820713850000062
from the above results, it can be seen that the welded-bottle steel can be stably produced using the respective example groups of the present invention, and although the C content is reduced, the yield strength can be achieved: 304-321MPa; tensile strength: 432-453MPa; the elongation is 42.6-44.1%, the yield ratio is 0.68-0.74, the welding performance and the deep drawing performance are good, the stability of the production process is high, the mass production can be realized, the welding performance and the deep drawing performance of the produced welded bottle steel product meet the product standard requirements, and the steel surface has no strip spot or black spot iron scale defects.
The steel performance of the comparison group 1 meets the requirements, but the iron scale defects are obvious, while in the comparison group 2, although the iron scale defects are superior to those of the comparison group 1, the weld crack sensitivity index is 0.214 and is far higher than the range of 0.096-0.103 of the embodiment group, and the elongation after fracture is 5.1 percent lower than the average value of the embodiment group, so that the product standard requirements cannot be met.
It should be noted that while the invention has been described in detail with respect to specific embodiments thereof, it will be apparent to those skilled in the art that various obvious changes can be made therein without departing from the spirit and scope of the invention.

Claims (7)

1. A method for producing welding bottle steel by endless rolling is characterized in that: the method comprises the following steps: continuous casting → rough rolling → induction heating → finish rolling → cooling and coiling; wherein:
s1, continuous casting: the thickness of the obtained casting blank is 70-110 mm; the continuous casting billet comprises the following chemical components in percentage by weight: c: less than or equal to 0.06%, si:0.09 to 0.25%, mn: less than or equal to 1.3 percent, S: less than or equal to 0.006 percent, P: less than or equal to 0.015 percent, alt: not less than 0.020%, and the balance of Fe and inevitable impurities;
s2, rough rolling: after the continuous rolling of the three stands, the rolling thickness is 12.0 to 20.0mm to the intermediate billet; the rough rolling outlet temperature is 960-1010 ℃;
s3, induction heating: heating the steel plate by an induction heating furnace, wherein the outlet temperature is 1060-1120 ℃;
s4, finish rolling: adopting five frames for continuous rolling, wherein the finish rolling temperature is 780-830 ℃;
s5, cooling and coiling: the cooling process adopts a rapid cooling mode after finish rolling, laminar cooling is carried out on boiled water from the first group of cooling headers, the valve opening proportion is 100%, and the coiling temperature is controlled to be 480-520 ℃.
2. The method for producing the welded-bottle steel by headless rolling according to claim 1, wherein: in the continuous casting process, the superheat degree is controlled to be 12-25 ℃.
3. The method for producing the welded-bottle steel by headless rolling according to claim 1, wherein: in the continuous casting process, the fluctuation of the liquid level is controlled to be less than or equal to 2.0mm.
4. The method for producing weld-bottle steel by headless rolling according to claim 1, wherein: the chemical components of the continuous casting billet comprise 0.03-0.06% of C, 0.8-1.30% of Mn, alt: 0.020-0.05%.
5. The method for producing the welded-bottle steel by headless rolling according to claim 1, wherein: in the rough rolling, three-stand continuous rolling is adopted.
6. The method for producing the welded-bottle steel by headless rolling according to claim 1, wherein: in the rough rolling, five-stand continuous rolling is adopted.
7. The method for producing the welded-bottle steel by headless rolling according to claim 1, wherein: the thickness is rolled to 1.5-3.5 mm.
CN202211041488.3A 2022-08-29 2022-08-29 Method for producing welded bottle steel by endless rolling Pending CN115318831A (en)

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