High-cleanliness pipeline steel smelting process

A high-cleanliness, pipeline steel technology, applied in the field of metallurgy, can solve problems such as carburization of molten steel, inability to produce stable batches, insufficient consumption of steel materials for converter furnace condition maintenance, etc.

Active Publication Date: 2015-05-20
NANJING IRON & STEEL CO LTD
View PDF5 Cites 48 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the use of carbon-containing materials such as alloys, covering agents, mold slags, and corrosion of refractory materials during the process from tapping the converter to pouring, it will inevitably cause carburization of the molten steel. Generally, the carbon content of the finished product is between 0.04% and 0.08%,

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • High-cleanliness pipeline steel smelting process
  • High-cleanliness pipeline steel smelting process
  • High-cleanliness pipeline steel smelting process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] This embodiment provides a high-cleanliness pipeline steel smelting process. In this embodiment, X70 pipeline steel is selected, and its main chemical composition is shown in Table 1; figure 1 As shown, the process route is: molten iron pouring → molten iron pretreatment → converter smelting → tapping deoxidation alloying → LF refining furnace → calcium treatment → RH vacuum furnace → continuous casting, which is characterized in that it includes the following specific steps:

[0032] Step 1, converter smelting:

[0033] (1) Hot metal pretreatment operation: the hot metal in the furnace is pretreated by desulfurization and slag is cleaned, wherein the S element content is 0.001%, and the S element content in scrap steel is 0.005%;

[0034] (2) Deep dephosphorization in the converter treatment process: adopt the "double slag method", blow smelting in the converter for 4 minutes, that is, the stage of the carbon-oxygen reaction, and perform the first slag dumping. Using ...

Embodiment 2

[0050] This embodiment provides a high-cleanliness pipeline steel smelting process. In this embodiment, X70 pipeline steel is selected, and its main chemical composition is shown in Table 1; figure 1 As shown, the process route is: molten iron pouring → molten iron pretreatment → converter smelting → tapping deoxidation alloying → LF refining furnace → calcium treatment → RH vacuum furnace → continuous casting, which is characterized in that it includes the following specific steps:

[0051] Step 1, converter smelting:

[0052] (1) Hot metal pretreatment operation: the hot metal that enters the furnace is pretreated by desulfurization and cleaned of slag, wherein the S element content is 0.004%, and the S element content in scrap steel is 0.008%;

[0053] (2) Deep dephosphorization in the converter treatment process: adopt the "double slag method", blowing in the converter for 5 minutes, that is, the stage of the carbon-oxygen reaction, and perform the first slag dumping. Usi...

Embodiment 3

[0069] This embodiment provides a high-cleanliness pipeline steel smelting process. In this embodiment, X70 pipeline steel is selected, such as figure 1 As shown, this embodiment provides a high-cleanliness pipeline steel smelting process. In this embodiment, X70 pipeline steel is selected, and its main chemical composition is shown in Table 1; figure 1 As shown, the process route is: molten iron pouring → molten iron pretreatment → converter smelting → tapping deoxidation alloying → LF refining furnace → calcium treatment → RH vacuum furnace → continuous casting, which is characterized in that it includes the following specific steps:

[0070] Step 1, converter smelting:

[0071] (1) Molten iron pretreatment operation: the molten iron entering the furnace is pretreated by desulfurization and cleaned of slag, wherein the S element content is 0.005%, and the S element content in scrap steel is 0.010%;

[0072] (2) Deep dephosphorization in the converter treatment process: the ...

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 discloses a high-cleanliness pipeline steel smelting process. The process route comprises molten iron pouring, molten iron pretreatment, converter smelting, tapping, deoxidizing, alloying, LF refining furnace, treating with calcium, RH vacuum furnace and continuous casting and is characterized by comprising the following specific steps: firstly, converter smelting process; secondly, refining furnace smelting process; and thirdly, continuous casting process. The invention belongs to a steel-making process in the field of metallurgy and relates to a method for smelting and controlling a high-cleanliness pipeline steel. By molten iron desulphurization pretreatment, optimizing a converter tapping and deoxidizing system and a slagging system, LF refining furnace deep deoxygenation and reducing slag manufacturing processes, RH high-vacuum-degree degassing and inclusion removal process, the pouring is protected by the continuous casting in the whole process so that the composition of a casting billet is uniform, the contents of harmful elements such as S, P, O, N and H are low, the non-metallic inclusions are effectively controlled, the casting billet is good in internal quality and the production of high value-added ultra-low sulfur steel is ensured.

Description

technical field [0001] The invention belongs to the field of metallurgy and relates to a pipeline steel smelting process, in particular to a pipeline steel smelting process with high cleanliness. Background technique [0002] With the rapid development of pipeline steel demand industries such as oil and natural gas, the reliability requirements for pipeline steel pipes are getting higher and higher, not only requiring high strength, high low temperature crack arrest toughness and good weldability, but also for special areas. Pipeline steel also requires anti-H 2 S corrosion ability and large strain resistance. [0003] In sour gas environment, the main quality problems that lead to the failure of pipeline steel are hydrogen induced cracking (HIC) and sulfide stress corrosion cracking (SSCC). It is generally believed that HIC mostly originates from harmful elements and inclusions in molten steel, and the formation of SSCC is closely related to HIC. In order to improve the ...

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): C21C7/06C21C7/10C21C1/02C21C5/28B22D11/18
Inventor 曹余良蔡可森周桂成周贺贺张小伟朱安静
Owner NANJING IRON & STEEL CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap