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Cr-containing Alloy steel and manufacturing method thereof

A technology of alloy steel and billet, applied in the field of Cr-containing alloy steel and its manufacturing, can solve the problems of carbon steel pipe line corrosion, poor weldability, and increased cost.

Inactive Publication Date: 2015-05-13
UNIV OF SCI & TECH BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] When transporting high-pressure, carbon dioxide-containing oil and gas media, carbon steel pipelines are prone to local corrosion and pipeline leakage. However, if a large amount of alloying elements are added to increase strength and local corrosion resistance, one will increase the cost a lot, and the other may cause weldability become worse

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  • Cr-containing Alloy steel and manufacturing method thereof
  • Cr-containing Alloy steel and manufacturing method thereof
  • Cr-containing Alloy steel and manufacturing method thereof

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Embodiment

[0189]According to the chemical composition listed in Table 1, steels A1-A6 of the present invention and control steels B1-B3 were obtained after smelting, forging, rolling, and heat treatment.

[0190] Wherein, steel A1-A6 of the present invention carries out forging, rolling and heat treatment according to the following process:

[0191] (1) Smelting is carried out according to the chemical composition listed in Table 1. The steel ingot obtained from the smelting is heated to 1200C with the furnace, and after being kept at this temperature for 1 hour, it is forged immediately after being released from the furnace. The final forging temperature is guaranteed not to be lower than 1000C.

[0192] (2) Billet after rolling and forging

[0193] (a) Carry out the rough rolling stage of the first stage, ensure that the starting rolling temperature is at 1100°C, and the final rolling temperature is at about 1000°C; the total reduction rate of the steel ingot is greater than 50%;

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Abstract

The invention relates to Cr-containing alloy steel and a manufacturing method thereof. The Cr-containing alloy steel contains 0.03-0.07 % of C, 1.50-4.99 % of Cr, 0.03-0.05 % of Nb, 0.15-0.25 % of Mo, 0.01-0.03 % of Ti and the balance of Fe and inevitable impurities in percentage by weight. The Cr-containing alloy steel provided by the invention has the advantages of good welding property and corrosion resistance, in particular good resistance to carbon dioxide local corrosion, and low production cost, and can be used for manufacturing oil gas transmission lines.

Description

technical field [0001] The invention relates to a Cr-containing alloy steel resistant to carbon dioxide localized corrosion and a manufacturing method thereof, in particular to a Cr-containing alloy steel that does not undergo localized corrosion and has weldability in the carbon dioxide-containing environment of oil and gas fields, and the alloy steel can be used to manufacture oil and gas transportation pipeline. Background technique [0002] Carbon dioxide is often associated with oil and gas reservoirs, and carbon dioxide dissolves in water to form carbonic acid, which will cause severe corrosion to oil and gas pipelines. Humid carbon dioxide usually causes localized corrosion and perforation of carbon steel pipelines. If stainless steel is used, although the corrosion problem can be solved, the cost will be greatly increased, and stainless steel has the problem of poor weldability. Therefore, it is very necessary to develop new steel grades that can resist carbon dioxi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/28
Inventor 路民旭常炜许立宁张雷李新仲柳伟张国安孙建波胡丽华陈太辉
Owner UNIV OF SCI & TECH BEIJING