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Process for producing non-quenched and tempered N80 steel grade petroleum pipeline

An oil pipe, non-quenched and tempered technology, applied in the field of metallurgy, can solve the problems of high process energy consumption, many processes, and high production costs

Inactive Publication Date: 2010-06-09
WUXI SEAMLESS OIL PIPE
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0002] At present, the production process of N80 steel grade petroleum pipes at home and abroad is still mainly heat treatment after thermal deformation, which has high energy consumption and many processes, resulting in high production costs.

Method used

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Embodiment Construction

[0013] Because the N80 steel grade oil pipe products are not only required to have high strength, but also need to meet the technical requirements for plasticity and toughness during the use of the product. Therefore, the content ratio of carbon and alloy elements in steel should be scientific and reasonable, and strive to minimize the content of harmful elements, non-metallic inclusions and gases in steel.

[0014] For this reason, only by properly reducing the carbon content in the steel can the plasticity and toughness requirements of steel pipes be met in use. The present invention adopts dual processes of alloy strengthening and process strengthening to achieve high strength and make it have certain plasticity and toughness.

[0015] In order to achieve the above object, the present invention adopts the following technical solutions.

[0016] 1) Steel selection

[0017] Initially, the present invention adopts 33Mn2V steel type for testing, but the test results are not sa...

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Abstract

The invention relates to the technical field of metallurgy, in particular to a process for producing a non-quenched and tempered N80 steel grade petroleum pipeline. According to the technical scheme, the non-quenched and tempered N80 steel grade petroleum pipeline comprises the following components in percentage by mass: C: 0.34 to 0.38; Si: 0.25 to 0.40; Mn: 1.45 to 1.70; V: 0.11 to 0.16; P: not more than 0.025; S: not more than 0.025; Als: not more than 0.020; Cu: not more than 0.020, Ni: not more than 0.020; and Cr: not more than 0.25. The steel has good comprehensive mechanical property even at as rolled state, therefore, the on-line normalization or thermal refining process of the non-quenched and tempered N80 steel grade petroleum pipeline is canceled, the production process is simplified, the production efficiency is improved, and the production cost is reduced.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a process technology for producing N80 steel grade oil pipes by adopting alloyed non-quenched and tempered steel and a controlled rolling process. Background technique [0002] At present, the production process of N80 steel grade petroleum pipes at home and abroad is still mainly heat treatment after thermal deformation, which has high energy consumption and many processes, resulting in high production costs. [0003] Through the research and test of "Non-quenched and tempered N80 steel grade petroleum pipe technology", the N80 steel grade petroleum pipe that meets the requirements of API standards can be produced by using the non-online normalization-normalizing controlled rolling process and the continuous casting billet of 36Mn2V steel grade Tube. Contents of the invention [0004] The purpose of this invention is to provide a kind of N80 steel grade oil pipe produced b...

Claims

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Application Information

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IPC IPC(8): C22C38/58C22C38/46B21C37/06
Inventor 宋箭平张毅许彦万立波
Owner WUXI SEAMLESS OIL PIPE
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