X52 pipeline steel hot-rolling coiled plate with super-thick specification and production method for same

A technology for pipeline steel and hot-rolled coil, applied in the direction of manufacturing converters, etc., can solve problems such as no method proposed, and achieve the effects of reducing production cost, improving strength and toughness, and simple process route

Active Publication Date: 2020-02-11
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention adopts 150mm continuous casting slab, through controlled rolling and controlled cooling two-stage rolling, to produce X52 steel strip with a finished product thickness of 5-7mm, but does not propose a method for producing thick specification (≥20mm) X52 steel strip from thin slab

Method used

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  • X52 pipeline steel hot-rolling coiled plate with super-thick specification and production method for same
  • X52 pipeline steel hot-rolling coiled plate with super-thick specification and production method for same

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Embodiment Construction

[0030] The specific embodiment of the present invention will be further described below in conjunction with embodiment:

[0031] A hot-rolled coil of ultra-thick specification X52 pipeline steel, the chemical composition in the steel contains: C0.060%-0.070%, Si 0.15%-0.25%, Mn 1.40%-1.50%, Nb 0.034%-0.050 %, Ti0.008%~0.022%, Cr 0.11%~0.17%, Al 0.015%~0.045%, P≤0.02%, S≤0.008%, N≤0.008%, and Pcm≤0.17%, the rest is Fe and not Avoid impurities.

[0032] Coil yield strength R t0.5 430~510MPa, tensile strength R m 520~620MPa, elongation A50mm ≥44%, single-valued Charpy impact energy Akv≥256J at 0°C, hardness value ≤210HV10, uniform structure in the thickness direction of the product.

[0033] The thickness of the finished coil is ≥20mm.

[0034] A production method for hot-rolled coils of ultra-thick specification X52 pipeline steel, the production process involves: molten iron pretreatment - converter smelting - out-of-furnace refining (LF+calcium treatment) - continuous cast...

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Abstract

The invention provides an X52 pipeline steel hot-rolling coiled plate with a super-thick specification and a production method for the same. Steel contains, by weight, the chemical ingredients including 0.060%-0.070% of C, 0.15%-0.25% of Si, 1.40%-1.50% of Mn, 0.034%-0.050% of Nb, 0.008%-0.022% of Ti, 0.11%-0.17% of Cr, 0.015%-0.045% of Al, P<=0.02%, S<=0.008%, N<=0.008%, Pcm<=0.17%, and the balance being Fe and inevitable impurities. The plate and the production method provided by the invention have the beneficial effects that the X52-grade pipeline steel designed with C-Mn-Nb-Cr series is used; the thickness specification exceeds 20mm; product alloy design is economic and rational; technological paths are simple and easy to execute; production efficiency is high; well-closed formation inthe thickness direction is ensured; and toughness is very high.

Description

technical field [0001] The invention belongs to the field of high-strength low-alloy steel of metal materials, and in particular relates to a hot-rolled coil of ultra-thick specification X52 pipeline steel and a production method thereof. Background technique [0002] Pipeline transportation is the most economical transportation method for long-distance transportation of oil and natural gas, and with the increase in global demand for oil and natural gas, the transportation pressure is gradually increasing. In order to ensure the safety and stability of oil and gas pipeline transportation, long-distance, high-pressure Delivery lines usually use thick-walled tubing. [0003] At present, the thickness of continuous casting slabs used in hot rolling in major steel mills is generally more than 200mm, while the continuous casting slabs used in the present invention are 170mm. Due to the small compression ratio, the production of X52 hot-rolled coils with a thickness of more than 2...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/26C22C38/28B22D11/12C21C5/35C21C7/064C21D8/02C22C33/04
CPCB22D11/1206C21C5/35C21C7/064C21D8/0205C21D8/0226C21D8/0247C21D2211/005C21D2211/009C22C33/04C22C38/02C22C38/04C22C38/06C22C38/26C22C38/28
Inventor 王杨黄国建孔祥磊黄明浩张英慧徐烽栗锐
Owner ANGANG STEEL CO LTD
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