A new semi-continuous rolling production system for producing middle and large scale section steel

Abstract

The application discloses a new semi-continuous rolling production system for producing medium-large scale section steel, which comprises three groups of rolling mills, namely, a blooming mill group, a rough rolling mill group and a finishing rolling mill group; the blooming mill group is provided with one blooming mill and is arranged separately; the rough rolling mill group is provided with one universal / two-roll interchangeable rolling mill and one two-roll edging mill and is arranged continuously; and the finishing rolling mill group is provided with seven universal / two-roll interchangeable rolling mills and is arranged continuously. The application has the advantages that the rough rolling mill group is newly added, the production mode is more flexible, the total number of rolling mills is smaller, the production line equipment investment is reduced, the rough rolling also adopts reciprocating rolling, the rough rolling can be selected to participate in or not participate in rolling according to product forming requirements, the production organization mode is more flexible, the finishing rolling is arranged continuously, the production capacity of the rolling mill can be fully exerted, the production cost is effectively reduced, and the market competition ability of the enterprise is enhanced.

Description

Technical Field

[0001] The present invention relates to a novel semi-continuous rolling production system for producing medium and large-sized steel sections, and in particular to a flexible and efficient novel semi-continuous rolling production process for medium and large-sized H-shaped steels, I-shaped steels, angle steels, channel steels and steel sheet piles. Background Art

[0002] The traditional production method of H-beam has three main process arrangements according to its size:

[0003] The first is a tandem arrangement, primarily consisting of one or two flaking mills, arranged separately and performing reciprocating rolling. A three-stand universal roughing mill is arranged with a universal + edge rolling + universal mill configuration, performing reciprocating rolling. One or two universal finishing mills are typically arranged with edge rolling + universal mill configuration, performing a single rolling pass. This tandem process is commonly used for large H-beams (H600X300 and larger), as well as I-beams, channels, angles, 500-750 series steel sheet piles, and other similarly sized products. Currently, the more common approach in China is to utilize the XH rolling process in the universal roughing mill, eliminating the universal finishing mill. The main advantage of the tandem arrangement is that it minimizes the number of universal mills required to provide sufficient universal passes, thereby reducing the number of universal mills and lowering production line investment. A disadvantage is that when used for small and medium-sized H-beams, the low efficiency of the reciprocating rolling process can lead to a sharp decrease in production line capacity.

[0004] The second type is the semi-continuous arrangement, which primarily consists of one or two flaking mills, arranged separately and performing reciprocating rolling; and a finishing mill consisting of 10-11 mills, arranged in a continuous configuration. This arrangement is typically used to produce medium-sized H-beams (H500X200 and below), I-beams, channels, angles of comparable cross-sectional dimensions, and 400-500 series steel sheet piles. Domestic finishing mills typically consist of 11 mills, reducing the number of flaking mill passes and increasing production line capacity. The primary advantage of the semi-continuous arrangement is high mill capacity, especially for medium- to small-sized steel grades. However, its disadvantage is that the number of universal passes is still relatively low for grades larger than H600X300. Adding a continuous rolling mill increases both production line equipment and plant investment, making it less cost-effective.

[0005] The third type is the fully continuous layout, primarily consisting of 14-16 stands. This arrangement is primarily used to produce H-beams up to H250x125, as well as I-beams, channels, angles, and other similarly sized steel products. The primary advantage of this fully continuous layout is high mill capacity, but its disadvantages include limited production line flexibility and low mill utilization for some products. Summary of the Invention

[0006] In order to overcome the above-mentioned defects, the purpose of the present invention is to provide a new semi-continuous rolling production system for producing medium and large-sized steel sections.

[0007] To achieve the above-mentioned object, the present invention provides a novel semi-continuous rolling production system for producing medium and large-sized steel sections, the system comprising:

[0008] There are three rolling mills in total, namely, the blooming mill, the roughing mill and the finishing mill;

[0009] Among them, the slab rolling mill group is equipped with one slab rolling mill, which is arranged separately;

[0010] The roughing mill group is equipped with a universal / two-roll interchangeable rolling mill and a two-roll edge rolling mill, arranged in a continuous manner;

[0011] The finishing mill group is equipped with 7 universal / two-roll interchangeable rolling mills arranged in a continuous manner.

[0012] Furthermore, the method for rolling H-beam and I-beam by the system includes the following steps:

[0013] It uses one slab mill, the roughing mill group uses one universal roughing mill and one edge rolling mill; the finishing mill group uses five universal rolling mills and two edge rolling mills. The finishing mill group layout is: universal + universal + edge rolling + universal + universal + edge rolling + universal;

[0014] The slab mill is arranged in a single stand and performs reciprocating rolling;

[0015] The two rolling mills of the roughing mill are arranged in a continuous manner, with reciprocating rolling;

[0016] The finishing mill, with its seven rolling mill stands arranged in a continuous configuration, rolls intermediate billets into finished H-beams and I-beams in a single pass. Compared to traditional semi-continuous production lines, this expands the product range and fully leverages the mill capacity advantages of semi-continuous rolling lines to produce medium- to large-sized H-beams, I-beams, channels, angles, and sheet piles, increasing production capacity. Furthermore, the reduced number of rolling mills in the finishing mill reduces equipment investment and operating costs.

[0017] Furthermore, when rolling angle steel and channel steel, one slab mill is used; the roughing mill is not used; the finishing mill adopts 7 two-roller mills; the slab mill is arranged in a single frame and performs reciprocating rolling; the 7 rolling mills in the finishing mill are arranged continuously, and the intermediate slab is rolled into angle steel and channel steel finished products at one time.

[0018] Furthermore, when rolling steel sheet piles, one slab mill is used, the roughing mill group uses only one two-roll mill, and the edge rolling mill is not used; the finishing mill group uses seven two-roll mills;

[0019] The slab mill is arranged in a single stand for reciprocating rolling; the roughing mill uses one stand for reciprocating rolling; the finishing mill has 7 stands arranged continuously, rolling the intermediate slab into finished steel sheet piles at one time.

[0020] In order to solve the many problems existing in the conventional semi-continuous rolling production lines and serial production lines for medium and large-sized steel sections at home and abroad, the present invention proposes a new semi-continuous rolling production process for producing medium and large-sized steel sections, which solves the problem of coexistence of multiple products such as H-shaped steel, steel sheet piles, angle steel, etc. in the existing medium and large-sized steel section production lines, solves the problem of balanced production capacity of large and small specifications of the existing production lines, and solves the problem of the large number of finishing rolling mills in the existing production lines and the long preparation period for changing the specification rolling mills.

[0021] By adopting the present invention, a new roughing mill unit is added, the production method is more flexible, and the total number of rolling mills is reduced. First, the investment in production line equipment is reduced; second, the roughing rolling also adopts reciprocating rolling, and it can be selected to participate in or not to participate in rolling according to the product forming requirements, so the production organization method is more flexible; third, the finishing rolling adopts a continuous layout, which can give full play to the production capacity of the rolling mill, effectively reduce production costs, and enhance the market competitiveness of the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a rolling mill layout diagram of a novel semi-continuous rolling production process for producing medium and large-sized steel sections according to an embodiment of the present invention:

[0023] Figure 2 When rolling H-beams and I-beams, one slab mill is used, the roughing mill group uses one universal roughing mill and one edge rolling mill; the finishing mill group uses five universal rolling mills and two edge rolling mills, and the finishing mill group layout is: universal + universal + edge rolling + universal + universal + edge rolling + universal.

[0024] Figure 3 When rolling angle steel and channel steel, one slab mill is used and the rough rolling unit is not used; the finishing rolling unit uses seven two-roll mills.

[0025] Figure 4 When rolling steel sheet piles, one slab mill is used, the rough rolling unit only uses one two-roll mill, and the edge rolling mill is not used; the finishing rolling unit uses seven two-roll mills.

[0026] Description of reference numerals:

[0027] I - slab mill area: 1 - slab mill; II - roughing mill area: 2 - roughing mill one; 3 - two-high roughing mill two; III - finishing mill area: 4 - finishing mill one; 5 - finishing mill two; 6 - finishing mill three; 7 - finishing mill four; 8 - finishing mill five; 9 - finishing mill six; 10 - finishing mill seven. DETAILED DESCRIPTION

[0028] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0029] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0030] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0031] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediary, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0032] like Figure 1 As shown, the novel semi-continuous rolling system for producing medium-to-large shaped steel sections described in the present invention comprises three rolling mill groups: a slab mill area, a roughing mill area, and a finishing mill area. The slab mill area includes a single slab mill; the roughing mill group includes a universal / two-roll interchangeable rolling mill and a two-roll edger mill, arranged in a continuous configuration; and the finishing mill group includes seven universal / two-roll interchangeable rolling mills, arranged in a continuous configuration.

[0033] like Figure 2 The figure shows the rolling method for H-beams and I-beams. One flaking mill is used, and the roughing mill consists of one universal roughing mill and one edger. The finishing mill uses five universal mills and two edgers. The product undergoes five to seven reciprocating rolls in the flaking mill before being transferred by rollers to the roughing mill. The roughing mill utilizes one universal mill and one edger in a continuous arrangement. The product undergoes three to five reciprocating rolls in the roughing mill before being transferred by rollers to the finishing mill. The finishing mill employs a seven-mill continuous arrangement: universal + universal + edger + universal + universal + edger + universal. The intermediate slab is rolled into finished H-beams and I-beams in one continuous roll. The universal rolling passes of the roughing mill can be increased or decreased according to the product forming requirements, making the production method more flexible and making it possible to produce H-beam products of larger specifications, expand the upper limit of H-beam products on the production line, effectively reduce production costs, and enhance market adaptability and competitiveness.

[0034] like Figure 3 The figure shows the rolling method for angle steel and channel steel. A single blooming mill is used, eliminating the roughing mill. The finishing mill utilizes seven two-roll mills. The product undergoes 5-7 reciprocating rolls in the blooming mill before being conveyed directly to the finishing mill via a roller table. The finishing mill, comprised of seven two-roll mills arranged in a continuous configuration, transforms the intermediate bloom into finished angle steel and channel steel in a single pass. Products like angle steel and channel steel can be produced without the roughing mill, simplifying process operations and reducing the investment in rolls, guides, and other process components in the roughing mill. This results in efficient, energy-efficient production, lowers production costs, and enhances the company's market competitiveness.

[0035] like Figure 4 The figure shows the rolling method used in steel sheet pile production. A single flaking mill is used, with the roughing mill employing only a single two-roller mill, eliminating the edger mill. The finishing mill utilizes seven two-roller mills. The product undergoes five to seven reciprocating rolls in the flaking mill before being conveyed by rollers to the roughing mill, where it undergoes three reciprocating rolls using a single two-roller mill. The rollers then convey the product to the finishing mill. The finishing mill, comprised of seven two-roller mills arranged in a continuous configuration, transforms the intermediate flaking into finished steel sheet piles in a single pass. Compared to traditional semi-continuous production lines, this allows for more flexible production organization and the ability to produce larger steel sheet piles. The line offers a wider variety of product sizes and specifications, enhancing its ability to adapt to market fluctuations.

[0036] The present invention has been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above-described embodiments. Various modifications may be made within the scope of knowledge of those skilled in the art without departing from the spirit of the present invention. Many other changes and modifications that do not depart from the spirit and scope of the present invention should be considered within the scope of protection of the present invention.

[0037] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0038] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A novel semi-continuous rolling production method for producing medium and large-sized steel sections, characterized in that: The method adopts a semi-continuous rolling production system, which includes: There are three rolling mills in total, namely, the blooming mill, the roughing mill and the finishing mill; Among them, the slab rolling mill group is equipped with one slab rolling mill, which is arranged separately; The roughing mill group is equipped with a universal / two-roll interchangeable rolling mill and a two-roll edge rolling mill, arranged in a continuous manner; The finishing mill group is equipped with 7 universal / two-roll interchangeable rolling mills arranged in a continuous manner; The method of the system for rolling H-beam and I-beam includes the following steps: It uses one slab mill, the roughing mill group uses one universal roughing mill and one edge rolling mill; the finishing mill group uses five universal rolling mills and two edge rolling mills. The finishing mill group layout is: universal + universal + edge rolling + universal + universal + edge rolling + universal; The slab mill is arranged in a single stand and performs reciprocating rolling; The two rolling mills of the roughing mill are arranged in a continuous manner, with reciprocating rolling; The finishing mill group has 7 rolling mills arranged in a continuous manner, rolling the intermediate billet into H-beam and I-beam finished products in one go; The method for rolling angle steel and channel steel in the system includes the following steps: using one slab mill; not using a roughing mill; using seven two-roller mills in a finishing mill; the slab mill is arranged in a single stand and performs reciprocating rolling; the seven rolling mills in the finishing mill are arranged in a continuous manner to roll the intermediate slab into finished angle steel and channel steel products at one time; The method for rolling steel sheet piles of the system includes the following steps: using one slab mill, using only one two-roll mill in the roughing mill group and not using an edge rolling mill; using seven two-roll mills in the finishing mill group; The slab mill is arranged in a single stand for reciprocating rolling; the roughing mill uses one stand for reciprocating rolling; the finishing mill has 7 stands arranged continuously, rolling the intermediate slab into finished steel sheet piles at one time.

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