Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Low-carbon ultralow-sulfur pure iron smelting method

A technology of ultra-low sulfur pure iron and smelting methods, applied in the manufacture of converters, etc., can solve the problems of human health hazards, unfavorable on-site production, etc., and achieve the effect of avoiding sulfur return

Pending Publication Date: 2022-04-15
ANGANG STEEL CO LTD
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

BaO is a highly toxic toxic substance, which is harmful to human health if inhaled or ingested, and is not conducive to on-site production

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Smelting low-carbon ultra-low sulfur pure iron DYCT-3, the composition requirements are C≤0.025%, Mn≤0.03%, P≤0.005%, S≤0.001%, and the nominal capacity of the converter is 260 tons.

[0026] DYCT-3 method for smelting low-carbon ultra-low-sulfur pure iron, molten iron pretreatment-converter double slag smelting-RH decarburization-LF dephosphorization-liquid steel slag removal-LF desulfurization-continuous casting; specifically includes:

[0027] 1. Hot metal pretreatment: the gross weight of iron folded between pouring tanks is 397 tons; iron selection before production, hot metal S = 0.024%, P = 0.113%, Ti = 0.0325%; hot metal pretreatment desulfurization content of 0.001%;

[0028] 2. Before the converter is produced, use molten iron with slag removal S≤0.005% in the furnace to rinse the furnace twice;

[0029] 3. Converter double slag smelting:

[0030] Add 30 tons of pure iron special scrap steel to the converter, start oxygen blowing, add slagging material for 50...

Embodiment 2

[0056] Smelting low-carbon ultra-low sulfur pure iron DYCT-3, the composition requirements are C≤0.025%, Mn≤0.03%, P≤0.005%, S≤0.001%, and the nominal capacity of the converter is 200 tons.

[0057] DYCT-3 method for smelting low-carbon ultra-low-sulfur pure iron, molten iron pretreatment-converter double slag smelting-RH decarburization-LF dephosphorization-liquid steel slag removal-LF desulfurization-continuous casting; specifically includes:

[0058] 1. Hot metal pretreatment: the gross weight of iron folded between pouring tanks is 308 tons; iron selection before production, hot metal S = 0.028%, P = 0.097%, Ti = 0.0228%; hot metal pretreatment desulfurization content of 0.001%;

[0059] 2. Before the converter is produced, use molten iron with slag removal S≤0.005% in the furnace to rinse the furnace twice;

[0060] 3. Converter double slag smelting:

[0061] Add 20.3 tons of scrap steel for pure iron to the converter, start oxygen blowing, add slagging material for 50 s...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a low-carbon ultralow-sulfur pure iron smelting method. The process route comprises the steps of molten iron pretreatment, converter double-slag smelting, RH decarburization, LF dephosphorization, molten steel slagging-off, LF desulfurization and continuous casting. The method specifically comprises the following steps: 1) molten iron pretreatment desulfurization: the S content of molten iron before pretreatment is less than or equal to 0.040%; s is required to be less than or equal to 0.002% after molten iron pretreatment desulfurization; (2) converter double-slag smelting is carried out to control resulfurization, specifically, special pure iron waste steel is added into a converter, oxygen blowing is started, a slagging material is added after oxygen blowing is carried out for 40-50 s, oxygen blowing is carried out for 4-5 min, the oxygen accumulation amount of oxygen blowing is 3500-4500 standard cubic meters, and a gun is lifted to discharge slag; 3) LF desulfurization: after molten steel slagging-off is finished and argon blowing is confirmed to be normal, carrying out oxygen determination operation; the top slag is strongly modified and desulfurized, and it is guaranteed that the outbound S is controlled to be 10 ppm or below; atomized aluminum powder is used in the middle and later periods of LF desulfurization, so that it is guaranteed that outbound Alt is not higher than 0.010%; and 4) controlling the resulfurization by a casting machine. According to the invention, after RH decarburization, LF desulfurization is carried out, and then the desulfurization is directly carried out on a machine, so that the resulfurization in the RH treatment process is avoided, and the ultralow sulfur control that the sulfur content of a finished product is less than or equal to 0.001% is ensured.

Description

technical field [0001] The invention relates to the technical field of iron and steel smelting, in particular to a low-carbon ultra-low-sulfur pure iron smelting method. Background technique [0002] Pure iron is an iron alloy with very low carbon content, which has excellent properties such as low coercive force, good thermal conductivity and electromagnetic properties, soft texture, and good toughness. At present, the purity of pure iron that has been industrialized and applied is more than 99.6%. It is mainly used as iron-based raw materials for smelting high-temperature alloys, heat-resistant alloys, precision alloys, and maraging steels. [0003] Ultra-low sulfur pure iron has high resistance to hydrogen-induced cracks and sulfur stress cracks. It is required to control the sulfur content in steel to ≤50ppm, so as to ensure that the pure iron reaches the level of ultra-low impurity elements to meet the requirements of secondary hardening steel, Production of precision ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C21C1/02C21C5/28C21C7/064C21C7/068C21C7/10
CPCY02P10/20
Inventor 陈晨朱晓雷廖相巍苏小利何洋彭春霖许孟春王晗桐张宏亮
Owner ANGANG STEEL CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com