X90 pipeline steel wide and thick plate and production method thereof

A production method and technology for wide and thick plates are applied in the field of low-carbon microalloyed steel, which can solve the problems of increased construction cost and increased weight of steel pipes.

Active Publication Date: 2014-08-13
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The data show that the increase of the delivery pressure can be achieved by increasing the strength level of the pipeline steel pipe and increasing the wall t

Method used

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  • X90 pipeline steel wide and thick plate and production method thereof
  • X90 pipeline steel wide and thick plate and production method thereof
  • X90 pipeline steel wide and thick plate and production method thereof

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Experimental program
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Embodiment Construction

[0030] According to the economical X90 pipeline steel wide and thick plate and its manufacturing method of the present invention, it is smelted on a 100-ton converter, cast into a continuous casting slab of 300mm×2400mm×2700mm, and rolled on a 4300mm wide and thick plate production line. The chemical composition is shown in Table 1, the process system is shown in Table 2, and the mechanical properties of the steel plate are shown in Table 3.

[0031] Table 1 Chemical composition wt% of steel plate

[0032] Example

O

Si

mn

P

S

Al

Nb

Ni

Ti

Cr

Cu

Mo

N

H

Example 1

0.045

0.25

1.80

0.011

0.0013

0.034

0.078

0.175

0.014

0.21

0.20

0.15

0.004

0.0001

Example 2

0.056

0.24

1.79

0.010

0.0008

0.036

0.063

0.175

0.014

0.19

0.21

0.12

0.003

0.0001

Example 3

0.060

0.22

1.75

0.009

0.0...

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Abstract

The invention relates to an X90 pipeline steel wide and thick plate and a production method thereof, belonging to the technical field of low-carbon microalloy steel. The wide and thick plate comprises the following components in percentage by weight: 0.06-0.10% of C, 0.20-0.50% of Si, 1.50-1.80% of Mn, at most 0.010% of P, at most 0.003% of S, 0.04-0.06% of Nb, 0.04-0.06% of V, 0.010-0.020% of Ti, 0.15-0.30% of Ni, 0.15-0.30% of Cr, 0.10-0.30% of Mo, 0.020-0.05% of Als, and the balance of Fe and inevitable impurities. The technique comprises the following steps: predesulfurizing blast furnace molten iron, smelting in a converter, carrying out LF+RH refinement, continuously casting a plate blank, heating the plate blank, rolling by a 4300 rolling mill, carrying out ACC quick cooling, cooling in pile, sampling, inspecting, warehousing and shipping. The steel plate has the advantages of high strength, excellent low-temperature toughness and excellent dynamic tear resistance.

Description

technical field [0001] The invention belongs to the technical field of low-carbon micro-alloy steel, and in particular relates to a wide and thick plate of X90 pipeline steel and a production method thereof. Background technique [0002] Oil and natural gas are important strategic materials for the national economy. Energy growth coupled with structural optimization and adjustment has driven the overall development of the oil and gas industry. Pipeline transportation is an important way to transport oil and gas from remote mining sites to end users over long distances. High-pressure and large-diameter long-distance pipelines have become the most economical and safest transportation method for oil and gas transportation. The data show that the increase of the delivery pressure can be achieved by increasing the strength level of the pipeline steel pipe and increasing the wall thickness, and the increase of the wall thickness will inevitably lead to the increase of the weight o...

Claims

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Application Information

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IPC IPC(8): C22C38/58C22C38/50C22C38/14C21D8/02
Inventor 谌铁强张国栋白学军王根矶张学峰李群李少坡周希楠白松莲宋欣冯路路万潇周德光刘海龙刘印良赵久梁李涛
Owner SHOUGANG CORPORATION
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