A method for controlling sulfide inclusions in non-quenched and tempered steel treated with barium alloy

A technology of non-quenched and tempered steel and control method, which is applied in the field of iron and steel metallurgy, which can solve the problems of low control level, prone to nozzle nodules, and high S content, and achieve the effect of preventing nozzle nodules

Active Publication Date: 2020-11-20
安徽钢研新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] The technical problems to be solved by the present invention are: low control level in the existing foundation, poor comprehensive properties of steel, high S content, high impurity content, and prone to nozzle nodules in the continuous casting process.

Method used

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  • A method for controlling sulfide inclusions in non-quenched and tempered steel treated with barium alloy
  • A method for controlling sulfide inclusions in non-quenched and tempered steel treated with barium alloy
  • A method for controlling sulfide inclusions in non-quenched and tempered steel treated with barium alloy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1) Steel type: C70S6BY

[0038] 2) Process flow: 100-ton converter smelting→LF refining+VD vacuum degassing→continuous casting of 220×280 billet→heat preservation and cleaning→heating in furnace→production of φ70mm material→heat preservation→straightening→peeling→pickling and cleaning→ultrasonic Flaw detection → sampling inspection and analysis. Among them, aluminum is added during the tapping process of the converter, and barium alloy is fed at the end of LF refining. While improving the cleanliness of molten steel, the residual Al 2 o 3 The inclusions are denatured into diffusely distributed oxide inclusion cores. As the basis for the further formation of sulfides with oxides as the core, sulfides are added after VD vacuum degassing.

[0039] 3) Key points of process control

[0040] (1) Alloying of converter tapping deoxidizer

[0041] Aluminum is added in the process of converter tapping for pre-deoxidation operation. The specific adding sequence is: ferrosilico...

Embodiment 2

[0056] 1) Steel type: F45MnV

[0057] 2) Process flow: 70 tons of EAF converter smelting→LF refining+VD vacuum degassing→continuous casting of 180×240 billet→slow cooling / hot delivery→heating furnace heating→product material→slow cooling→straightening→finishing→ultrasonic flaw detection → Check storage. Among them, aluminum is added during the tapping process of the converter, and barium alloy is fed at the end of LF refining. While improving the cleanliness of molten steel, the residual Al 2 o 3 The denaturation of inclusions is a diffusely distributed oxide inclusion core. As the basis for the further formation of sulfides with oxides as the core, sulfides are added after adding barium alloy for ≥ 10 minutes.

[0058] 3) Key points of process control

[0059] (1) Pre-deoxidize by adding aluminum in the tapping process of the electric furnace, and adjust the alloy and aluminum content in the refining process as shown in the table below.

[0060]

[0061] (2) Then feed ...

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Abstract

The invention provides a method for controlling sulfide inclusions of non-tempered steel through barium alloy treatment. Modification of Al2O3 inclusions is conducted by adopting the barium alloy, while the cleanliness of molten steel is improved, the residual Al2O3 is distributed in a disperse uniform state and serves as the core of the subsequent sulfide inclusions; and through control of Al, Baand S contents, adding time and method, eight-furnace continuous pouring of continuous casting is achieved under the condition that the sulphur content of the non-tempered steel is 0.04%-0.06%, the thick series of the sulfide inclusions is less than or equal to 2.0 grade, and the fine series is less than or equal to 3.0 grade.

Description

technical field [0001] The invention relates to the control of the composition, form and distribution of sulfide inclusions for improving cutting performance in the production process of non-quenched and tempered steel, and belongs to the refining inclusion control technology in the field of iron and steel metallurgy. Background technique [0002] Micro-alloyed non-quenched and tempered steel is an ideal energy-saving and resource-saving economical new material, which meets the requirements of the steel industry development policy and has broad economic and social benefits and market prospects. It has a wide range of uses, mainly used in the manufacture of crankshafts, connecting rods, transmission shafts, steering knuckles and other workpieces of various automobiles and engineering machinery. Non-quenched and tempered steel for automobiles can reduce energy consumption and cost, reduce deformation and cracking caused by quenching in the quenching and tempering process, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/06C21C7/068C21C7/10
Inventor 王启丞王忠英陈子坤王前
Owner 安徽钢研新材料科技有限公司
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