High-strength high-toughness X100 pipeline steel hot-rolled steel strip and manufacturing method thereof

A manufacturing method and high-toughness technology, applied in metal rolling and other directions, can solve problems such as the content limitation of Ca and O elements, achieve the effects of improving the shape of inclusions and refining the size, good strength and toughness matching, and reducing production costs

Active Publication Date: 2012-07-11
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Similarly, this technical solution focuses on the pipe-making process, and does not limit the content of Ca and O elements

Method used

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  • High-strength high-toughness X100 pipeline steel hot-rolled steel strip and manufacturing method thereof
  • High-strength high-toughness X100 pipeline steel hot-rolled steel strip and manufacturing method thereof
  • High-strength high-toughness X100 pipeline steel hot-rolled steel strip and manufacturing method thereof

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Experimental program
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Effect test

Embodiment 1-7

[0041] Manufacture the high-strength and high-toughness X100 pipeline steel hot-rolled strip of the present invention according to the following steps (see Table 1 for the chemical element ratio of each steel strip in Embodiment 1-7, and see Table 1 for detailed process parameters in Embodiment 1-7. Table 2):

[0042] (1) Electric furnace or converter smelting raw materials;

[0043] (2) Continuous casting;

[0044] (3) Reheat the slab, the heating temperature is 1145-1250°C, the thickness of the slab is 250mm, the holding time is determined according to the thickness of the slab and the heat preservation coefficient, and the heat preservation coefficient is 0.8-1.50min / mm;

[0045] (4) Rough rolling: the rough rolling temperature is 930-1000°C;

[0046] (5) Finish rolling: the finish rolling temperature is 750-900°C;

[0047] (6) Controlled cooling: the cooling rate is 41-70°C / s;

[0048] (7) Coiling; the coiling temperature is determined according to the cooling rate in ...

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Abstract

The invention discloses a high-strength high-toughness X100 pipeline steel hot-rolled steel strip. The steel strip comprises the following chemical elements in percentage by mass: 0.015 to 0.090 percent of C, 0.1 to 0.5 percent of Si, 1.50 to 1.79 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.003 percent of S, 0.10 to 0.40 percent of Cr, 0.03 to 0.10 percent of Nb, 0.001 to 0.100 percent of Zr, 0.01 to 0.035 percent of Ti, 0.31 to 0.60 percent of Mo, 0.10 to 0.40 percent of Cu, 0.10 to 0.50 percent of Ni, 0.0010 to 0.0050 percent of Ca, 0.02 to 0.045 percent of Al, less than or equal to 0.010 percent of N, less than or equal to 0.008 percent of O and the balance of Fe and other inevitable impurities. Correspondingly, the invention also discloses a method for manufacturing the steel strip. The hot-rolled steel strip has high comprehensive mechanical properties and manufacturability and comprises simple components.

Description

technical field [0001] The invention relates to steel grades and a manufacturing method thereof in the field of metallurgy, in particular to a pipeline steel and a manufacturing method thereof. Background technique [0002] Pipeline transportation is one of the most cost-effective transportation methods for oil and gas transportation. As the exploitation of oil and natural gas gradually extends to remote areas such as polar regions and deserts, in order to improve the transmission efficiency and reduce the cost of pipeline construction and operation, it is necessary to use high-strength, large-diameter, high-pressure pipelines for oil and natural gas transmission, which also affects the pipeline. The use of steel puts forward the requirements of high strength and high toughness. [0003] The publication date is January 6, 2010, the publication number is CN101619416, and the Chinese patent document titled "a high-strength X100 pipeline steel hot-rolled flat plate and its pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C22C38/50C21D8/02B21B1/46
Inventor 章传国郑磊
Owner BAOSHAN IRON & STEEL CO LTD
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