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Method for producing Q345B steel grade with Ti microalloyed through TMCP process and Q345B steel grade

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 improving bearing capacity Effect

Active Publication Date: 2020-12-04
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 Q345B steel grade with Ti microalloyed through TMCP process and Q345B steel grade
  • Method for producing Q345B steel grade with Ti microalloyed through TMCP process and Q345B steel grade
  • Method for producing Q345B steel grade with Ti microalloyed through TMCP process and Q345B steel grade

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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 a Q345B steel grade with Ti microalloyed through a TMCP process and a Q345B steel grade. The method comprises the following steps of liquid iron meltingin a high-temperature furnace, liquid iron pretreatment, converter smelting, LF refining, RH vacuum treatment, sheet billet continuous casting, cast blank slow cooling, heating in a heating furnace, rolling through a medium and heavy plate mill, rapid cooling, checking, finishing and storage. When the liquid iron melting in the high-temperature furnace is carried out, a sheet billet is fused intohigh-temperature liquid iron through the high-temperature smelting furnace, the temperature of the high-temperature liquid iron is 1255 DEG C, and [S] is 0.01%. In converter smelting, top-bottom combined blowing operation and an argon blowing process are adopted, and it is ensured that [C] at the end point of a converter is smaller than or equal to 0.07%, and [P] at the end point of the converteris smaller than or equal to 0.025%. In sheet billet continuous casting, the superheat degree of tundish molten iron is controlled to be 25-45 DEG C, and the pulling speed is controlled to be 3.7-4.0 m / min. According to the method for producing the Q345B steel grade through the TMCP process, on the premise of ensuring the performance of the steel grade, the content of Mn in the Q345B steel grade isreduced, the steelmaking technology is simplified, the production cost is reduced, and the bearing capacity of a component is improved.

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 Applications(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