Preparation method of one-steel multi-stage titanium microalloyed structural steel

A technology of micro-alloying and structural steel, which is applied in the field of metallurgy, can solve the problems of simultaneous production of multi-grade steel, etc., and achieve the effects of ensuring strength, reducing the amount of addition, and improving low-temperature toughness

Pending Publication Date: 2022-06-21
SD STEEL RIZHAO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problem that the simultaneous production of multi-grade steel cannot be satisfied in the prior art, the present invention provides a method for preparing a steel multi-grade titanium microalloyed structural steel, which realizes the production of hot-rolled structural steel products of different grades by using one composition system , effectively reduce production costs, improve the weldability of steel plates, and have good application prospects

Method used

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  • Preparation method of one-steel multi-stage titanium microalloyed structural steel
  • Preparation method of one-steel multi-stage titanium microalloyed structural steel
  • Preparation method of one-steel multi-stage titanium microalloyed structural steel

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Embodiment 1

[0024] The preparation method of one-steel multi-level titanium microalloyed structural steel according to the present invention comprises the following steps:

[0025] (1) Smelting and casting

[0026] Chemical composition design: C 0.18%, Si 0.18%, Mn 0.350%, Ti 0.04%, P 0.011%, S0.012%, Alt 0.018%, CEV 0.23%, the balance is Fe and other inevitable impurities; will be as above The chemical composition is converted into a steel billet by converter smelting and casting, and the thickness of the steel billet is 230mm;

[0027] (2) Heating and hot rolling

[0028] The billet obtained in step (1) is heated, the temperature of the soaking section is set to 1230 ° C, and the soaking time is 40 minutes; rough rolling and finishing rolling are used for hot rolling, and the pass distribution of the rough rolling mill and the finishing rolling mill and the reduction ratio of each pass are changed from two. The rough rolling setting model of the grade system is calculated, the rough r...

Embodiment 2

[0034] The preparation method of one-steel multi-level titanium microalloyed structural steel according to the present invention comprises the following steps:

[0035] (1) Smelting and casting

[0036] Chemical composition design: C 0.19%, Si 0.19%, Mn 0.30%, Ti 0.04%, P 0.013%, S0.010%, Alt 0.019%, CEV 0.24%, the balance is Fe and other inevitable impurities; will be as above The chemical composition is converted into a steel billet by converter smelting and casting, and the thickness of the steel billet is 230mm;

[0037] (4) Heating and hot rolling

[0038] The billet obtained in step (1) is heated, the temperature of the soaking section is set to 1230 ° C, and the soaking time is 40 minutes; rough rolling and finishing rolling are used for hot rolling, and the pass distribution of the rough rolling mill and the finishing rolling mill and the reduction ratio of each pass are changed from two. The rough rolling setting model of the grade system is calculated, the rough ro...

Embodiment 3

[0044] The preparation method of one-steel multi-level titanium microalloyed structural steel according to the present invention comprises the following steps:

[0045] (1) Smelting and casting

[0046] Chemical composition design: C 0.20%, Si 0.21%, Mn 0.32%, Ti 0.04%, P 0.011%, S0.009%, Alt 0.017%, CEV 0.25%, the balance is Fe and other inevitable impurities; will be as above The chemical composition is converted into a steel billet by converter smelting and casting, and the thickness of the steel billet is 230mm;

[0047] (6) Heating and hot rolling

[0048] The billet obtained in step (1) is heated, the temperature of the soaking section is set to 1230 ° C, and the soaking time is 40 minutes; rough rolling and finishing rolling are used for hot rolling, and the pass distribution of the rough rolling mill and the finishing rolling mill and the reduction ratio of each pass are changed from two. The rough rolling setting model of the grade system is calculated, the rough ro...

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Abstract

The invention relates to the technical field of metallurgy, in particular to a preparation method of one-steel multi-stage titanium microalloyed structural steel, which comprises the following steps: heating, hot-rolling, cooling and coiling a steel billet, wherein in the heating process, the temperature of a soaking section is set to be 1210-1250 DEG C, and the soaking time is 30-60 min; rough rolling and finish rolling are adopted for hot rolling, the pass distribution of a rough rolling machine and a finish rolling machine and the reduction rate of each pass are calculated through a two-stage system rough rolling set model, the rough rolling outlet temperature is 1040-1080 DEG C, and the finish rolling temperature of finish rolling is 830-870 DEG C; and the cooling process is as follows: after finish rolling, cooling to 560-640 DEG C at the cooling speed of 20-30 DEG C/s, and coiling. According to the method, hot-rolled structural steel products of different grades can be produced by adopting one component system, the production cost is effectively reduced, the weldability of the steel plate is improved, and good application prospects are achieved.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a preparation method of one-steel multi-stage titanium microalloyed structural steel. Background technique [0002] Low-alloy structural steel is currently widely used in construction machinery, bridges and other structures and mechanical parts that carry dynamic loads. With the continuous progress of infrastructure construction in my country and other countries in the world, its demand is increasing day by day, and it has become one of the steel types generally produced in large quantities by major domestic steel companies. In addition, the demand for low-alloy structural steel is large and there are many grades, and steel grades of different strength grades require different composition designs to meet, and different toughness requirements in the same grade of steel also require different composition designs to achieve. The composition design is easy to cause the difficulty...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/02C21D9/00C22C38/02C22C38/04C22C38/06C22C38/14
CPCC21D9/0081C21D8/0205C21D8/0226C22C38/02C22C38/04C22C38/14C22C38/06
Inventor 杨贵玲夏继年刘光军贾崇雪王南辉于爽黄诚王专付志强牛夫成王硕董正洋
Owner SD STEEL RIZHAO CO LTD
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