Smelting method of HIC (Hydrogen Induced Crack)/SSCC (Sulfide Stress Corrosion Cracking)-preventing steel

A smelting method and converter smelting technology, which is applied in the field of out-of-furnace refining and smelting and converter, can solve problems not involving HIC/SSCC steel, and achieve the effect of transformation and removal

Active Publication Date: 2014-01-29
HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent application number CN201110080746.4 "HIC-resistant ferritic system heat-resistant steel and its preparation process", CN200910089348.1 "a method of controlling non-metallic inclusions in HIC-resistant pipeline steel" all involve technologies related to HIC-resistant steel. Explain the production process, and some focus on heating and rolling processes, but do not involve specific control methods for the smelting process of HIC / SSCC steel

Method used

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  • Smelting method of HIC (Hydrogen Induced Crack)/SSCC (Sulfide Stress Corrosion Cracking)-preventing steel
  • Smelting method of HIC (Hydrogen Induced Crack)/SSCC (Sulfide Stress Corrosion Cracking)-preventing steel
  • Smelting method of HIC (Hydrogen Induced Crack)/SSCC (Sulfide Stress Corrosion Cracking)-preventing steel

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Experimental program
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Effect test

Embodiment 1

[0017] The molten iron is pretreated before entering the furnace. After the treatment, the composition of the molten iron is: S=0.012%, P=0.15%, Si=0.43%, and the temperature is 1295°C. The slag is cleaned before the molten iron enters the converter. Converter smelting adds molten iron and scrap steel, 135 tons of molten iron and 18 tons of scrap steel. Converter smelting adopts double slag method, converter end point control C=0.080%, P=0.010%, temperature 1630°C; strict slag blocking, tapping time 5min, adding aluminum deoxidizer to the ladle when tapping 1 / 5 Carry out deoxidation, add 900kg of synthetic slag to the ladle at the same time, add the alloy and slag when 2 / 5 of the steel is tapped, and add other alloys according to normal requirements; after the converter furnace, carry out strong argon blowing and stirring on the molten steel, the content of acid-soluble aluminum in the steel It is 0.063%, the temperature is 1572 ℃, feed 100 m aluminum wire.

[0018] After the...

Embodiment 2

[0022] The molten iron is pretreated before entering the furnace. After treatment, the composition of the molten iron is: S=0.013%, P=0.15%, Si=0.46%, and the temperature is 1291°C. The slag must be cleaned before the molten iron enters the converter. Converter smelting adds molten iron and scrap steel, 133 tons of molten iron and 15 tons of scrap steel. Converter smelting adopts double slag method operation, converter end point control C=0.060%, P=0.008%, temperature 1627°C; strict slag blocking, tapping time 5min, adding aluminum deoxidizer to ladle for 1 / 5 of tapping Deoxidation, while adding 900kg of synthetic slag to the ladle, the alloy and slag are added when 2 / 5 of the steel is tapped, and other alloys are added according to normal requirements; 0.069%, the temperature is 1570 ℃, feed 80 m aluminum wire.

[0023] After the molten steel is transported to the LF refining station, the argon blowing pipe is connected to blow argon at the bottom of the molten steel, and th...

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Abstract

The invention discloses a converter smelting and external refining control method of HIC (Hydrogen Induced Crack)/SSCC (Sulfide Stress Corrosion Cracking)-preventing steel. A smelting process route of converter-CAS (Control Automatic System) station-LF (Low Frequency) refining-VD (Vacuum Distillation)/RH (Relative Humidity) vacuum-calcium treatment-soft blowing-continuous casting is adopted. Low-phosphor requirements of the HIC/SSCC-preventing steel are obtained through controlling the converter smelting process route; and meanwhile, part of deoxidation type inclusions are removed by carrying out strong deoxidation, alloying as well as residue washing in a converter steel-tapping process, and over 60% of sulfur in molten steel is removed by sufficient stirring of the residue washing. In the LF refining process, refining furnace slag which is high in alkalinity, high in Al2O3 and strong in reducibility is obtained by regulating components of the refining furnace slag, and the inclusions are transformed and removed towards a low melting point by virtue of balance of the furnace slag-molten steel-inclusions. Proper vacuum treatment time and vacuum degree are kept at a vacuum treatment furnace so as to remove part of gas and inclusions, excessive calcium line is fed into the molten steel after being broken in air, and then the molten steel is softly blown and stirred for over 20 minutes to obtain the molten steel with ultralow oxygen and ultralow sulfur.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, and in particular relates to low-phosphorus, ultra-low-oxygen, ultra-low-sulfur converters and out-of-furnace refining and smelting methods. Background technique [0002] With the continuous development of the world's oil and natural gas industry, oil and gas drilling and production gradually progress to the southwest and offshore, and the depth of drilling and production oil layers increases, but the oil and gas in many oil fields contain H 2 S. For example, the Luojiazhai oil well in Sichuan, China, H in oil and gas 2 The S content is as high as 15% to 18%, and the H in the oil and gas transported by the Jiaodu Line gas pipeline in Chuandong Oilfield 2 The S content reaches 1%. h 2 It is one of the most corrosive and harmful media in oil and natural gas. It will cause hydrogen-induced cracks in steel used in crude oil storage tanks, oil and gas pipelines, etc., seriously aff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C22C33/04C21C5/28C21C7/00
CPCY02P10/20
Inventor 杨俊刘建兵夏政海杨云清谭小斌翟运涛张勇伟高海亮
Owner HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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