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High titanium special welding wire steel smelting method

A smelting method and welding wire steel technology, applied in the field of iron and steel metallurgy, to achieve the effects of smooth drawing, simple and easy smelting process, and low cost

Active Publication Date: 2015-08-12
QINGDAO SPECIAL STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above problems, the present invention provides a relatively simple and general high-titanium special welding wire steel smelting method. The specific process is molten iron pretreatment desulfurization-80t converter-90t LF refining furnace-continuous casting 150mm×150mm billet, the purpose is to pass the technology The method stabilizes the yield of titanium, ensures the stability of titanium content in molten steel, successfully solves the blockage problem of ladle nozzle and submerged nozzle, and controls the carbon content stably at 0.03-0.08%, so that the welding wire can be drawn smoothly

Method used

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preparation example Construction

[0023] The preparation method of the high-titanium special welding wire steel provided by the invention is:

[0024] 1) Control requirements for tapping composition at the end of the converter: C ≤ 0.05%, P ≤ 0.012%, S ≤ 0.020%; tapping temperature ≥ 1600°C; deoxidation and alloying during tapping, the order and weight of alloy addition are: tapping Add 23-25kg / t of high-silicon-silicon-manganese and 2-4kg / t micro-aluminosilicon ferrosilicon after 1 / 3 of the steel; add 0.5-1kg / t of silicon-calcium-barium after tapping 2 / 3, and control the oxygen content at the end of the converter at less than 30ppm.

[0025] 2) After the LF refining furnace enters the station, add slagging materials, the components of the slagging materials are lime 7-8kg / t steel, wollastonite 5.5-6.5kg / t steel and appropriate amount of fluorite; the refining process mainly uses calcium carbide Deoxidation, add calcium carbide on the slag surface several times, the total amount added is 1.0-2.0 kg / t steel, t...

Embodiment 1

[0031] The smelting method of high titanium special welding wire steel ER50-G is as follows:

[0032] 1) Control requirements for tapping composition at the end of the converter: C: 0.045%, P: 0.008%, S: 0.015%; tapping temperature is 1615°C; deoxidation and alloying are carried out during tapping, and the order and weight of alloy addition are: tapping 1 After / 3, add 23.5kg / t of high-silicon-silicon-manganese and 2.5kg / t of micro-aluminosilicon ferrosilicon, and add 0.55kg / t of silicon-calcium-barium after tapping 2 / 3.

[0033] 2) The quality of slagging materials added after the LF furnace enters the station is: lime 7.1kg / t steel, wollastonite 5.6kg / t steel, fluorite 1.2kg / t steel; The quality of calcium carbide is 40kg, and 30kg of calcium carbide is added during the first power-down period; after power transmission and temperature increase, sampling operation is performed, and 100kg of medium-carbon ferromanganese and 40kg of micro-aluminum ferrosilicon are added to fine...

Embodiment 2

[0037] The smelting method of high titanium special welding wire steel ER50-G is as follows:

[0038] 1) Control requirements for tapping composition at the end of the converter: C: 0.05%, P: 0.009%, S: 0.012%; tapping temperature 1621°C; deoxidation and alloying during tapping, the order and weight of alloy addition: tapping 1 After / 3, 23.7kg / t of high-silicon-silicon-manganese and 2.8kg / t of micro-aluminosilicon ferrosilicon are added, and 0.6kg / t of silicon-calcium-barium is added after tapping 2 / 3.

[0039] 2) The quality of the slagging materials added after the LF furnace enters the station is: lime 7.05kg / t steel, wollastonite 5.6kg / t steel, fluorite 1.2kg / t steel; the refining process is added to the slag surface several times The mass of calcium carbide is 40kg, 30kg of calcium carbide is added during the first power transmission of the electrode, and the sampling operation is carried out after power transmission and temperature increase, and 40kg of micro-aluminum f...

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Abstract

The invention discloses a high titanium special welding wire steel smelting method, the technical process of converter-ladle furnace (LF) refining-150 mm*150 mm small square billet continuous casting is used, the titanium content is stably controlled at 0.14% to 0.19%, on average, 0.16%; carbon content is stably controlled at 0.03-0.08%; the total oxygen content is stably controlled at 0.0030% or less, nozzle clogging problem is successfully solved, the number of furnaces of continuous casting can reach 22, welding wire welding performance is good, splash is greatly reduced, and the demand of a high-end welding wire material can be achieved. The high titanium special welding wire steel smelting method adopts steel manufacture conventional production equipment, and is simple in operation and strong in commonality, casting blank quality is stable, and the production cost is low.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, in particular to a method for smelting high-titanium special welding wire steel. Background technique [0002] With the popularization of welding robots at home and abroad and the development of welding technology automation, manufacturing enterprises have an increasing demand for welding materials suitable for automatic welding. Ti-containing welding steel is added Ti and some other elements on the basis of ordinary welding steel, which can reduce spatter by 30%-50%. , the weld shape is beautiful, and it is the most widely used welding wire product in Japan and developed countries in Europe and America. With the continuous progress of the welding wire market, the demand for high-end welding wire materials such as titanium-containing welding wire is increasing. [0003] Titanium-containing welding wire steel can be divided into three grades according to the control of titani...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/28C21C7/06B22D11/16
Inventor 肖超亓奉友张虎贾灏甄先锋王时松杨咏阶
Owner QINGDAO SPECIAL STEEL CO LTD
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