Seawater corrosion-resistant steel pipe and manufacturing method thereof

A manufacturing method and seawater-resistant technology, applied in the field of corrosion-resistant steel pipes and their manufacture, can solve the problems of increased production and manufacturing costs, failure to meet the yield strength of steel structures, and low C content in steel materials, so as to improve electrochemical corrosion resistance, good Economic and market benefits, the effect of low alloy addition

Active Publication Date: 2016-06-01
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The C content of the steel materials disclosed in the above two patent documents is low, which cannot meet the yield strength of the steel structure in the marine environment, and the disclosed steel materials all contain Mo, so the production cost of the product is increased.

Method used

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  • Seawater corrosion-resistant steel pipe and manufacturing method thereof
  • Seawater corrosion-resistant steel pipe and manufacturing method thereof
  • Seawater corrosion-resistant steel pipe and manufacturing method thereof

Examples

Experimental program
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Embodiment A1-A5 and comparative example B1-B2

[0056] The steel pipes in Examples A1-A5 and B1-B2 were manufactured according to the following steps:

[0057] (1) Smelting: after refining outside the furnace and vacuum degassing, the mass percentage distribution ratio of each chemical element in Examples A1-A5 and B1-B2 is shown in Table 1;

[0058] (2) Continuous casting into a round billet or casting into a square billet, and rolling into a round tube billet after casting;

[0059] (3) Heating and soaking: heating to AC3 and above to keep warm and soak;

[0060] (4) Steel pipes are rolled in the austenite phase zone, and the final rolling temperature is greater than 880°C;

[0061] (5) Cool to room temperature to obtain a hot-rolled product.

[0062] It can also continue to normalize, and the normalizing temperature is 860-940°C to obtain a normalized product.

[0063] Table 1 lists the mass percentage distribution of each chemical element in the steel pipes in Examples A1-A5 and Comparative Examples B1-B2 of this cas...

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Abstract

The invention discloses a seawater corrosion-resistant steel pipe. The seawater corrosion-resistant steel pipe comprises a ferrite-pearlite mixed matrix and contains 0.13-0.20wt% of C, 0.10-0.35wt% of Si, 0.9-1.5wt% of Mn, 0.05-0.4wt% of Cr, 0.01-0.04wt% of Al, 0.05-0.4wt% of Cu, 0.05-0.3wt% of Ni, 0.06-0.12wt% of V, 0.008-0.02wt% of N and the balance Fe and other unavoidable impurities. The invention discloses a manufacturing method of the seawater corrosion-resistant steel pipe. The manufacturing method comprises the following steps of 1, smelting, 2, casting and then rolling for round pipe blank production, 3, heating and soaking, 4, austenite-phase rolling for steel pipe production, and 5, cooling to a room temperature. The seawater corrosion-resistant steel pipe has excellent seawater corrosion resistance, good processing welding performances and excellent low-temperature toughness.

Description

technical field [0001] The invention relates to steel grades and a manufacturing method thereof, in particular to a corrosion-resistant steel pipe and a manufacturing method thereof. Background technique [0002] With the shortage of oil resources and rising oil prices, the development of marine resources is becoming increasingly important. Correspondingly, the steel demand and performance requirements for related facilities (such as offshore platforms) used for marine resource exploration are also increasing. Seawater is a corrosive medium with a considerable salt content, and the salt content of surface seawater is generally 3.20% to 3.75%. In addition, the salinity of seawater increases with the depth of the ocean. The marine environment is divided into the ocean atmosphere zone, the ocean splash zone, the seawater tidal range zone, the seawater full immersion zone and the sea mud zone. The area where corrosion is most serious in the marine environment is the splash zone...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/46C22C38/48C22C38/50C22C33/04C21D8/10
Inventor 田青超左宏志王起江
Owner BAOSHAN IRON & STEEL CO LTD
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