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A method for producing thick-walled and large-diameter acid-resistant and corrosion-resistant pipeline steel with high-phosphorus molten iron

A production method and large-diameter technology, applied in the manufacture of converters, etc., to reduce core segregation, ensure acid and corrosion resistance, and reduce core band segregation

Active Publication Date: 2018-11-09
NANJING IRON & STEEL CO LTD
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  • Summary
  • 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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  • A method for producing thick-walled and large-diameter acid-resistant and corrosion-resistant pipeline steel with high-phosphorus molten iron
  • A method for producing thick-walled and large-diameter acid-resistant and 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-wall large-caliber acid-corrosion-resistant pipeline steel with high-phosphorus molten iron. The method is characterized in that the average phosphorus content of the molten iron is about 0.120%, and the ultra-low-carbon, ultra-low-phosphorus and ultra-low-sulfur acid-corrosion-resistant pipeline steel with the Grade of B-X70M, the thickness of35 mm-40 mm and the width of 3,500 mm-5,000 mm is produced. The smelting process of the method comprises the steps of BOF, RH, LF, CCM, billet heating and rolling. According to the method, the ultra-low-carbon ultra-low-phosphorus, ultra-low-sulfur and ultra-low-manganese content design is adopted, cast slab center segregation is reduced, the formation of MnS inclusions is reduced, the accumulation of core carbides is completely eradicated, reduction of the grain size of rolling plates and elimination or reduction of banded structures are achieved through TMCP rolling, and the acid-corrosion resistance of products is guaranteed, so that the requirement of the acid-corrosion resistance of a base body of the acid-corrosion-resistant pipeline steel is met.

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 Patents(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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