Method for producing thick-wall large-caliber acid-corrosion-resistant pipeline steel with high-phosphorus molten iron

A technology for large-diameter and pipeline steel, which is applied in the production of thick-walled and large-diameter acid-resistant and corrosion-resistant pipeline steel in high-phosphorus molten iron, and achieves the effect of satisfying high alkalinity, ensuring acid and corrosion resistance, and reducing grain size.

Active Publication Date: 2018-01-09
NANJING IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is: to solve the technical problem of smelting thick-walled and large-diameter acid-resistant pipeline steel with high-phosphorus molten iron, and to provide a method for producing thick-walled and large-diameter acid-resistant and corrosion-resistant pipeline steel with high-phosphorus molten iron and its anti-acid and corrosion resistance pipeline steel

Method used

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  • Method for producing thick-wall large-caliber acid-corrosion-resistant pipeline steel with high-phosphorus molten iron
  • Method for producing thick-wall large-caliber acid-corrosion-resistant pipeline steel with high-phosphorus molten iron

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Embodiment 1

[0019] This embodiment is a method for producing thick-walled and large-diameter acid-resistant and corrosion-resistant pipeline steel with high-phosphorus molten iron, including the following steps:

[0020] (1) The composition of molten iron by weight percentage is: C: 4.56%, Si: 0.42%, Mn: 0.26%, P: 0.119%, S: 0.015%; the weight percentage composition of rolled state is: C: 0.0180%, Si: 0.32% , Mn: 1.12%, P: 0.007%, S: 0.0006%, Nb: 0.0450%, Ti: 0.012%, Ca: 0.0030%, Al: 0.035%, Cu: 0.230%, V: 0.033%, Cr: 0.23% , the balance being Fe and impurities;

[0021] (2) The desulfurization station uses lime and magnesium powder for composite desulfurization. After desulfurization, the slag is cleaned to ensure that the sulfur after the converter is less than 80ppm;

[0022] (3) Converter adopts double slag method, low-temperature tapping at the end of smelting, high alkalinity, and high oxidation to achieve ultra-low phosphorus smelting. When the blowing reaches 85%, the sub-lance t...

Embodiment 2

[0033] The composition of the acid-resistant and corrosion-resistant pipeline molten steel in this embodiment is: C: 4.56%, Si: 0.42%, Mn: 0.26%, P: 0.121%, S: 0.015%; the weight percentage composition of the rolling state is: C : 0.022%, Si 0.23%, Mn: 0.98%, P: 0.007%, S: 0.0005%, Nb: 0.030%, Ti: 0.017%, Ca: 0.0021%, Al: 0.035%, Cu: 0.21%, V: 0.031%, Cr: 0.26%, and the balance is Fe and impurities. The process steps of the production method of the acid-resistant and corrosion-resistant pipeline steel of the present embodiment are the same as those of the first embodiment, and the production process of the present embodiment is specifically as follows:

[0034]

[0035] The acid-resistant pipeline steel in this example is designed with ultra-low carbon, ultra-low phosphorus, low sulfur, and low manganese, low-temperature casting, and TMCP rolling. The internal structure of the rolled material is denser and the grains are finer, which meets the requirements of different spec...

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Abstract

The invention discloses a method for producing thick-walled and large-diameter acid-resistant and corrosion-resistant pipeline steel by using high-phosphorus molten iron. For Grade B-X70M acid-resistant and corrosion-resistant pipeline steels with a thickness of 35mm-40mm and a width of 3500mm-5000mm, the smelting process of the present invention is BOF→RH→LF→CCM→billet heating→rolling, using ultra-low carbon, ultra-low phosphorus and sulfur, The design of low manganese content reduces the segregation of the slab center, reduces the formation of MnS inclusions, eliminates the accumulation of carbides in the core, reduces the grain size of the rolled plate through TMCP rolling, eliminates or reduces the band structure, and ensures the acid resistance of the product. Corrosion performance, so as to achieve acid and corrosion resistant pipeline steel matrix to meet the acid and corrosion resistance.

Description

technical field [0001] The invention relates to a method for producing thick-walled and large-diameter acid-resistant and corrosion-resistant pipeline steel with high-phosphorus molten iron. Specifically, it uses molten iron with a phosphorus content of about 0.120% to produce an ultra-low-carbon, ultra-low-phosphorus, and ultra-low-sulfur pipeline steel. Grade B-X70M acid-resistant and corrosion-resistant pipeline steel with a thickness of 35 mm to 40 mm and a width of 3500 mm to 5000 mm and a production method thereof. Background technique [0002] The main performance requirements of acid and corrosion resistant pipeline steel are HIC and SSC resistance. Hydrogen sulfide is a weakly acidic electrolyte, which mainly exists in the form of molecules in aqueous solutions with a pH of 1 to 5. Hydrogen sulfide reacts with metals: H 2 S+Fe→FeS+2H generates atomic hydrogen, H 2 S acts as a poisoning agent for hydrogen to form hydrogen molecules, making atomic hydrogen easy to e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/06C22C38/20C22C38/26C22C38/28C22C38/24C22C38/42C22C38/46C22C38/48C22C38/50C21C7/10C21C5/36C21D8/02
Inventor 翟冬雨
Owner NANJING IRON & STEEL CO LTD
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