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Application process of Ti microalloying in 400MPa-grade steel bar production

A technology of micro-alloying and grade steel bars, applied in the field of metallurgy, can solve the problems of precipitation strengthening, fluctuation of chemical composition, fluctuation of product performance, etc., and achieve the effects of mature production technology, stable product quality, and reduced product production cost.

Inactive Publication Date: 2021-02-05
JIANGSU YONGGANG GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the traditional production process, due to the high chemical activity of Ti, it is easy to form compounds with oxygen, sulfur, carbon, nitrogen, etc., which can neither play a role in precipitation strengthening

Method used

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  • Application process of Ti microalloying in 400MPa-grade steel bar production
  • Application process of Ti microalloying in 400MPa-grade steel bar production
  • Application process of Ti microalloying in 400MPa-grade steel bar production

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Embodiment Construction

[0033] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but the protection scope of the present invention is not limited thereto.

[0034] In this embodiment, steel bars with two specifications of 22mm and 16mm are produced, and the production process is based on the instructions figure 1 The process route, where the process parameters are:

[0035] (1) The tapping temperature of molten steel is controlled above 1630°C;

[0036] (2) The titanium wire is fed 2 to 3 minutes before the argon blowing station, and the mass percentage is controlled within the range of 0.020% to 0.050%;

[0037] (3) Continuous casting superheat control 20-35 ℃;

[0038] (4) Steel rolling temperature parameters:

[0039] Heating furnace temperature control: preheating section 680-980°C, heating section 900-1080°C, heating section 1060-1180°C, soaking section 1090-1180°C;

[0040] The rolling temperature is 1050-1100℃;

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Abstract

The invention belongs to the field of metallurgy, and particularly relates to an application process of Ti microalloying in 400MPa-grade steel bar production. Steel bar components comprise C, Si, Mn,P, S, Ti, iron and inevitable impurity elements. Main process parameters are specifically as follows: (1) the tapping temperature of molten steel is controlled above 1630 DEG C; (2) titanium wires arefed 2-3 minutes before being discharged from an argon blowing station, and the content is controlled within the range of 0.020%-0.050%; (3) the continuous casting superheat degree is controlled at 20-35 DEG C; and (4) the temperature of each stage is controlled during steel rolling. According to the application process, microalloy fine grain strengthening, recrystallization rolling, non-recrystallization rolling and deformation induced ferrite mechanisms are utilized, the temperature control of each stage is distributed, and the refining and homogenization of the microstructure of steel are realized through continuous temperature control and deformation rolling processes.

Description

technical field [0001] The invention belongs to the field of metallurgy, in particular to an application process of Ti microalloying in the production of 400MPa steel bars. Background technique [0002] As a microalloying element, Ti can improve and improve the properties of microalloyed steel bars, but Ti is rarely used as a microalloying element. Adding a small amount of Ti to the steel bar can improve the cold forming performance and welding performance of the steel bar, and can increase the strength of the steel bar. Ti can provide considerable precipitation strengthening effect, and at the same time can refine grains. [0003] TiN can play the role of grain refinement. The formed TiN refines the initial austenite grains, prevents grain growth when heated, and improves the weldability and toughness of steel bars. [0004] TiC can play the role of precipitation strengthening, which is formed by combining Ti and carbon. Ti that exceeds the ideal stoichiometric ratio of ...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/14C22C38/60C21C7/00C21D8/08
CPCC21C7/0006C21C7/0056C21D8/08C21D2211/005C21D2211/009C22C38/02C22C38/04C22C38/14C22C38/60
Inventor 马正洪张小伟徐震王哲黄沁
Owner JIANGSU YONGGANG GROUP CO LTD
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