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Steel strip for oil casing and production method of steel strip for oil casing

A technology for oil casing and steel strip, applied in metal rolling and other directions, can solve the problems of many alloying elements, high production cost, high Nb content, and achieve simple production process, good welding performance and formability, and strong adaptability. Effect

Active Publication Date: 2014-10-22
PANGANG GRP XICHANG STEEL & VANADIUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These two patents use Nb and Ti composite microalloying, and the Nb content is high, not only the production cost is high, but also the yield ratio is high
[0006] The oil casing of Chinese patent CN01126611.2 adopts V-Ni-B microalloying, V content is 0.07%-0.13%, Ni content is 0.05-0.25%, many alloy elements, high production cost
[0007] In the low-alloy steel used in the manufacture of J55-grade welded petroleum casing with publication number CN1924061A, its chemical composition is C: 0.16% to 0.21%, Si: 0.10% to 0.35%, Mn: 1.00% to 1.30%, P≤0.020% , S ≤ 0.012%, V: 0.020% ~ 0.070%, Als: 0.008% ~ 0.060%, the rest is Fe and inevitable impurities; but its yield ratio and elongation are not ideal

Method used

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  • Steel strip for oil casing and production method of steel strip for oil casing
  • Steel strip for oil casing and production method of steel strip for oil casing
  • Steel strip for oil casing and production method of steel strip for oil casing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1 Adopting the method of the present invention to prepare hot-rolled steel for oil casing

[0033] The specific process is: hot metal desulfurization→converter smelting compound blowing→deoxidation, alloying and desulfurization of high-alkalinity refining slag→replenishing Al wire on the small platform behind the furnace→Ti microalloying in LF furnace, fine-tuning of alloy composition and V microalloying→ Calcium feeding line→continuous casting→slab heating→high pressure water descaling→rough rolling→finish rolling→laminar cooling→coiling; among them, the components of the hot continuous rolling steel strip for pipes are shown in Table 1, and the process parameters of each step are shown in Table 2 and Table 3, see Table 4 for mechanical properties.

[0034] Table 1

[0035] Example

C

Si

mn

P

S

V

Ti

1

0.17

0.17

1.15

0.017

0.004

0.07

0.012

[0036] Table 2

[0037]

[0038] ta...

Embodiment 2～10

[0043]Adopt the method in the embodiment 1 to produce the steel strip for oil casing, the components are shown in Table 5, and the process parameters of each step are shown in Table 6 and Table 7,

[0044] The mechanical properties are shown in Table 8.

[0045] table 5

[0046] Example

C

Si

mn

P

S

V

Ti

2

0.18

0.18

0.98

0.015

0.008

0.07

0.015

3

0.19

0.12

1.06

0.017

0.003

0.08

0.014

4

0.16

0.17

1.15

0.012

0.009

0.07

0.017

5

0.15

0.19

1.08

0.020

0.004

0.08

0.014

6

0.20

0.18

1.12

0.014

0.005

0.09

0.017

7

0.19

0.16

1.16

0.017

0.006

0.07

0.012

8

0.18

0.17

1.03

0.015

0.008

0.08

0.016

9

0.19

0.19

1.10

0.016

0.005

0.07

0.015

[0047] Continued Table 5

[0048] ...

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Abstract

The invention relates to a steel strip for oil casing and a production method of the steel strip for oil casing and belongs to the field of alloy steel. The technical problem to be solved by the invention is to provide hot rolled steel for oil casing and a production method of the hot rolled steel for oil casing. The steel strip for oil casing disclosed by the invention comprises the following chemical components in percentage by weight: 0.15%-0.20% of C, 0.10%-0.20% of Si, 0.95%-1.20% of Mn, less than or equal to 0.025% of P, less than or equal to 0.015% of S, 0.05%-0.010% of V, 0.008%-0.020% of Ti and the balance of iron and inevitable impurities. Furthermore, the invention also discloses a production method of the steel strip for oil casing. The steel strip for oil casing prepared by the invention has the characteristics that the yield ratio is less than 0.08, and the elongation is equal to or greater than 37%; and excellent weldability and formability are achieved.

Description

technical field [0001] The invention relates to a steel strip for petroleum casing and a production method thereof, belonging to the field of alloy steel. Background technique [0002] Oil casing is an important pipeline material in the process of oil and natural gas exploitation. Oil casing has always been made of seamless steel pipes. However, with the development of microalloying technology and controlled rolling and controlled cooling technology, hot continuous rolling strip steel can obtain excellent Comprehensive performance, after welding and forming, it can completely replace seamless steel pipes, and has the advantages of high dimensional accuracy, uniform wall thickness, strong extrusion resistance, no cracking after perforation, and low price. It is gradually replacing seamless steel pipes. [0003] J55 straight seam welded oil casing steel strip is required to meet the corresponding strength requirements, but also requires good welding performance, formability an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C21D8/02B21B1/22
Inventor 张开华叶晓瑜李卫平周伟熊学刚王羿龚慧
Owner PANGANG GRP XICHANG STEEL & VANADIUM CO LTD