Flexible manufacturing method of hot-rolled structural steel plate

A flexible manufacturing and structural steel plate technology, applied in the field of metallurgical technology, can solve the difficulty of increasing the organization of production, it is difficult to solve the problems of diversified user needs and production technology, organization management, and increase production costs, so as to improve the production rhythm and The effect of management efficiency, reduction of production cost, and saving of alloy resources

Inactive Publication Date: 2013-09-11
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, users have slightly different requirements for product performance, and manufacturers have to adjust the alloy composition to meet the requirements, which not only increases production costs, but also causes frequent switching of steel types in steelmaking, continuous casting, and rolling production areas, increasing In addition to the difficulty of organizing production, it is especially prominent for enterprises with insufficient steelmaking capacity
Therefore, the traditional production mode has been difficult to solve the contradiction between diversified user needs and production technology, organizational management, and it is urgent for enterprises to adapt more flexibly to changes in the market and customer needs

Method used

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  • Flexible manufacturing method of hot-rolled structural steel plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1: Production of 245 MPa strength level hot-rolled steel plate.

[0030] Its chemical composition weight percentage is: C0.17%, Si0.10%, Mn0.4%, P0.018%, S0.010%, and the remainder is Fe and unavoidable impurities.

[0031] Continuous rolling process: heating temperature 1150°C, rough rolling entry temperature 1060°C, finish rolling start temperature 1010°C, final rolling temperature 860°C, deformation per pass 23%, uniform laminar cooling after rolling. The cooling rate is 13°C / s, and the coiling temperature is 620°C.

Embodiment 2

[0032] Example 2: Production of 245 MPa strength grade hot-rolled steel plate.

[0033] Its chemical composition weight percentage is: C0.19%, Si0.12%, Mn0.25%, P0.010%, S0.014%, and the remainder is Fe and unavoidable impurities.

[0034] Continuous rolling process: heating temperature 1140°C, rough rolling start temperature 1055°C, finish rolling start temperature 1005°C, finish rolling temperature 850°C, deformation per pass 22%, uniform laminar cooling after rolling. The cooling rate is 9°C / s, and the coiling temperature is 630°C.

[0035] Produced according to the above-mentioned process of Examples 1 and 2, the finished product structure after rolling is ferrite and a small amount of pearlite existing in the grain boundary, the average ferrite grain size is 10-12 μm, and the pearlite content is 8-12%.

Embodiment 3

[0036] Embodiment 3: Production of 275MPa strength level structural strip steel.

[0037] The weight percentage of its chemical composition is: C0.17%, Si0.10%, Mn0.40%, P0.009%, S0.010%, and the remainder is Fe and unavoidable impurities.

[0038] A two-stage controlled rolling process is adopted:

[0039] a. The rolling temperature in the first-stage recrystallization zone is 1050°C, rolling for 5 passes, and the deformation in each pass is 28%; the thickness of the billet to be warmed is 25mm for the finished product.

[0040] b. The rolling temperature in the second stage is 985°C, the rolling is 9 passes, the cumulative deformation is 67%, and the final rolling temperature is 835°C.

[0041] c. Uniform laminar cooling after rolling; cooling rate 16°C / s; coiling temperature 590°C.

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Abstract

The invention provides a flexible manufacturing method of a hot-rolled structural steel plate. The hot-rolled structural steel plate comprises 0.15-0.20% of C, 0.05-0.20% of Si, 0.2-0.5% of Mn, at most 0.020% of P and at most 0.015% of S. By adopting a flexible production technique, the steel billet is subjected to controlled rolling and controlled cooling, and phase-change reinforcement and fine crystal reinforcement are combined to reasonably control the microstructure of steel, thereby producing structural steel plates with three different strength grades from the same steel grade components. The steel strip with the strength level of 245 MPa and below is subjected to a continuous rolling technique; the steel strip with the strength level of 275 MPa is subjected to a two-stage controlled rolling technique; and the steel strip with the strength level of 345 MPa is subjected to a two-stage controlled and previous-stage quick cooling technique. The invention can save alloy resources, and implements multiple functions of steel; the strength, toughness and plasticity reach the requirements of a high-strength structural steel plate; and the invention can lower the production cost, can enhance the production rhythm and management efficiency, and is beneficial to large-scale production and integrated management of enterprises.

Description

technical field [0001] The invention belongs to the field of metallurgical technology, and in particular relates to a method for producing hot-rolled structural steel plates of various strength levels through a flexible technology for low-cost cast slabs. Background technique [0002] Flexible rolling technology (FRT, flexible rolling technolo-gy) [1-z] is to achieve the purpose of "one steel with multiple functions" through reasonable composition design and controlled rolling and controlled cooling technology. Flexible production technology realizes the intensive and large-scale production of steel types, makes full use of resources, taps the potential of materials, reduces production costs, and reduces management burdens. [0003] Structural steel is generally divided into low-strength grade ordinary carbon structural steel and high-strength grade low-alloy structural steel. Generally, ordinary C-Mn steel is used to manufacture low-strength hot-rolled structural steel pla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C21D8/02
Inventor 杨旭郭宝安杨玉张吉富付青才刘志伟
Owner ANGANG STEEL CO LTD
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