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Method for producing ti microalloyed q345b steel grade and q345b steel grade by tmcp process

A technology of micro-alloying and steel type, applied in the field of Q345B steel type, can solve the problems of rolling process and welding performance adverse effects, steelmaking cost increase, etc., to achieve the goal of enhancing market competitiveness, reducing steel consumption, and reducing alloy content Effect

Active Publication Date: 2022-01-04
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, in the process of producing Q345B low-alloy steel plates, it is usually necessary to add 1% to 1.7% of Mn. Due to the limitation of equipment capacity, some manufacturers also need to add appropriate amount of microalloying elements such as Nb, V, Ti, etc., which not only makes The cost of steelmaking increases, and it also adversely affects the subsequent rolling process and welding performance

Method used

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  • Method for producing ti microalloyed q345b steel grade and q345b steel grade by tmcp process
  • Method for producing ti microalloyed q345b steel grade and q345b steel grade by tmcp process
  • Method for producing ti microalloyed q345b steel grade and q345b steel grade by tmcp process

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Embodiment 1

[0034] see figure 1 , the method for producing Ti microalloyed Q345B steel by TMCP process of the present invention comprises the following steps: melting molten iron in a high-temperature furnace → molten iron pretreatment → converter smelting → LF refining → RH vacuum treatment → thin slab continuous casting → slab slowing Cold→heating in heating furnace→rolling in plate rolling mill→rapid cooling→inspection→finishing→storage;

[0035] Wherein, in the process of melting molten iron in a high-temperature furnace, the thin slab is melted into high-temperature molten iron through a high-temperature smelting furnace, wherein the temperature of the high-temperature molten iron is 1255°C, and [S] is 0.01%;

[0036] Among them, in the pretreatment process of molten iron, since Ti is an easily oxidizable element, in order to ensure the content of effective Ti, sufficient deoxidation must be carried out before adding Ti; among them, in the process of converter smelting, the operation...

Embodiment 2

[0044] The following are specific cases to illustrate:

[0045] see Figure 1-Figure 8 , the method for producing Ti microalloyed Q345B steel by TMCP process of the present invention comprises the following steps: melting molten iron in a high-temperature furnace → molten iron pretreatment → converter smelting → LF refining → RH vacuum treatment → thin slab continuous casting → slab slowing Cold→heating in heating furnace→rolling in plate mill→rapid cooling→inspection→finishing→storage.

[0046] In the process of melting molten iron in a high-temperature furnace, the thin slab is melted into high-temperature molten iron through a high-temperature smelting furnace, wherein the temperature of the high-temperature molten iron is 1255°C, and [S] is 0.01%; Easy to oxidize elements, so in order to ensure the effective Ti content, it must be fully deoxidized before adding Ti;

[0047] In the process of processing, it is also necessary to determine the optimal content ratio of Mn an...

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Abstract

The invention discloses a method for producing Ti microalloyed Q345B steel through TMCP process and the Q345B steel. The method comprises the following steps: melting molten iron in a high-temperature furnace→pretreatment of molten iron→converter smelting→LF refining→RH vacuum treatment →Thin slab continuous casting→slab slow cooling→heating furnace heating→medium plate rolling mill→rapid cooling→inspection→finishing→warehousing; among them, the molten iron is melted in the high temperature furnace, and the thin slab is melted in the high temperature smelting furnace into high temperature molten iron, the temperature of the high temperature molten iron is 1255°C, and [S] is 0.01%. [P]≤0.025%; in thin slab continuous casting, the superheat of the tundish molten iron is controlled at 25-45°C, and the casting speed is controlled at 3.7-4.0m / min. The method for producing the Q345B steel grade through the TMCP process of the invention reduces the content of Mn in the Q345B steel grade under the premise of ensuring the performance of the steel grade, simplifies the steelmaking process, reduces the production cost, and improves the bearing capacity of components.

Description

technical field [0001] The invention relates to a medium-thick plate production process, in particular to a method for producing Ti microalloyed Q345B steel through a TMCP process and the Q345B steel. Background technique [0002] With the increasingly fierce global competition, only by producing low-cost and high-quality steel can it gain a place in the downturn of the steel market. [0003] Q345B steel belongs to low-alloy high-strength structural steel. This steel has good comprehensive mechanical properties and process properties, and is widely used in engineering. The domestic medium plate factory produces Q345B steel plate, and the chemical composition used is similar, respectively: Wuyang factory: C0.15-0.18; Si≤0.5; Mn1.25-1.4; S<0.02; P<0.025; Shaogang factory: C0.14-0.18; Si0.38-0.44; Mn1.35-1.47; S0.007-0.13; P0.022-0.028; Angang C0.15; Si0.32; Mn1.44; .023; According to the data, the content of C, the main element of Q345B steel plate composition, is abou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/04C22C38/02C22C38/04C22C38/14B21B1/46B21B3/00B21B37/74
CPCC22C33/04C22C38/02C22C38/04C22C38/14C22C38/002B21B3/00B21B1/463B21B37/74
Inventor 戴杰涛黄海涛陈美蓉沈健祝韬
Owner GUANGZHOU UNIVERSITY