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3Cr seamless steel pipe and production method thereof

A technology of seamless steel pipe and production method, which is applied in the field of metallurgy, can solve the problems of high cost and unsatisfactory mechanical properties of 3Cr seamless steel pipe, and achieve the effect of high cost, excellent performance and slow cooling speed

Active Publication Date: 2010-12-01
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 a 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 → 340 continuous rolling mill hot rolling → quenched and tempered heat treatment → flaw detection, hydraulic pressure, inspection, and 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] Scrap steel: pipe head, billet head, billet tail or a type of scrap steel with low five-hazard elements and residual elements;

[0025] ●Electric furnace smelting

[0026] End point control of electric furnace: C≥0.05%, P≤0.005%;

[0027] Elec...

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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 particularly relates to 3Cr seamless steel pipes and a manufacturing method thereof. Background technique [0002] 3Cr seamless steel pipe is an economical CO 2 Corrosion of oil well pipe. CO 2 Corrosion is a common problem in many oilfields. Generally, 13Cr martensitic stainless steel seamless steel pipes can be used to solve it. However, for lean mines and low permeability oilfields, oil wells have short mining life and the use of expensive 13Cr is not economical. Therefore, economic development is urgently needed. Type anti-CO 2 Corrosion oil well pipe, 3Cr is low in alloy content, low cost, and has certain resistance to CO 2 Corrosion performance, which satisfies the oilfield’s 2 The need to corrode oil well pipes. [0003] Chinese patent 00125882.6 relates to an anti-CO 2 Low-alloy steel for tubing and casing corroded by seawater: In terms of weight percentage, its chemical composition dist...

Claims

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Application Information

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