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3Cr seamless steel pipe and production method thereof

A technology of seamless steel pipes and steel pipes, applied in the field of metallurgy, can solve the problems of unsatisfactory mechanical properties and high cost of 3Cr seamless steel pipes, and achieve the effects of high cost, excellent performance and fast cooling speed

Active Publication Date: 2012-07-04
PANGANG GROUP VANADIUM TITANIUM & RESOURCES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] On the whole, the mechanical properties of 3Cr seamless steel pipes involved in domestic and foreign literature are not very ideal, and the cost is relatively high.

Method used

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  • 3Cr seamless steel pipe and production method thereof

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Embodiment 1

[0017] According to the API 5CT standard L-80 steel grade, the 3Cr seamless steel pipe with the specification of 244.48*11.05 is produced. The steel grade is 20Cr3Mo. The specific composition is shown in Table 1.

[0018] Table 1 Chemical composition of 20Cr3Mo steel

[0019] C

Si

mn

P

S

Cr

Mo

Al

Ti

0.15

0.22

0.65

0.016

0.004

3.03

0.39

0.025

0.01

[0020] Production process flow: electric furnace steelmaking → continuous casting of 280 billets → hot rolling of 340 continuous rolling mills → quenching and tempering heat treatment → flaw detection, hydraulic pressure, inspection, packaging.

[0021] 1. Electric furnace steelmaking:

[0022] ●Raw material requirements

[0023] Hot metal: P≤0.090%, S≤0.050%, As≤0.02%, Sn≤0.01%;

[0024] Steel scrap: pipe head, billet head, billet tail or a class of scrap steel with low five harmful elements and residual elements; ...

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Abstract

The invention belongs to the technical field of metallurgy, in particular to a 3Cr seamless steel pipe and a production method thereof. The invention solves the first technical problem by providing a 3Cr seamless steel pipe with high hardenability and refined grains, wherein the 3Cr seamless steel pipe comprises chemical components in percentage by weight: 0.1-0.2% of C, 0.1-0.5% of Si, 0.3-0.8% of Mn, 2-4% of Cr, 0.3-0.6% of Mo, 0.0024-0.024% of Ti, 0.01-0.04% of Al, 0-0.03% of P, 0-0.03% of S and the balance of Fe and unavoidable foreign matters. The 3Cr seamless steel pipe has the component design of lower C content, which can prevent cracking in hardening, Mo element can increase the hardenability, and Ti element can refine grains and ensure that the mechanical property satisfies the API standard.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a 3Cr seamless steel pipe and a manufacturing method thereof. Background technique [0002] 3Cr seamless steel pipe is an economical anti-CO 2 Corrosion oil well pipe. CO 2 Corrosion is a common problem in many oil fields, which can generally be solved by using 13Cr martensitic stainless steel seamless steel pipes. However, for lean ore and low-permeability oil fields, the production life of oil wells is short, and it is not economical to use expensive 13Cr. Therefore, it is urgent to develop economical Anti-CO 2 Corrosion oil well pipe, 3Cr has a certain resistance to CO due to its low alloy content and low cost 2 Corrosion performance, better meet the requirements of the oil field for economical anti-CO2 2 The demand for corroded oil well pipes. [0003] Chinese patent 00125882.6 relates to an anti-CO 2 And low-alloy steel for seawater corrosion oil casing...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/28C21D9/08
Inventor 江健黄英黄云
Owner PANGANG GROUP VANADIUM TITANIUM & RESOURCES
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