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Thick-wall large-diameter high-grade pipeline steel for increasing low-temperature toughness and manufacturing method thereof

A technology of low temperature toughness and manufacturing method, applied in the field of iron and steel metallurgy, can solve the problem that the low temperature toughness cannot be improved, the fine bainite true ferrite structure cannot be formed, the core band structure cannot be effectively eliminated, and the strength, Uniform fine-grained structure with higher toughness, etc., to reduce the number of phosphorus removal passes, solve manufacturing difficulties, and improve mechanical properties.

Active Publication Date: 2017-12-22
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The thick-walled large-diameter pipeline steel for oil transportation (φ1422×30.8mm thick-walled large-diameter pipeline steel) is a high-end product of pipeline steel, which requires a large pipe diameter and meets the requirements of low-temperature service. Currently, the existing domestic technology cannot make breakthroughs and improve Barriers to Low Temperature Toughness of the Variety
In the prior art, the manufacturing method of thick-walled large-diameter high-grade pipeline steel cannot form fine bainite and true ferrite structure, and cannot effectively eliminate the banded structure in the core and achieve uniformity with higher strength and toughness. The fine-grained structure meets the requirements of low-temperature toughness of the product

Method used

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  • Thick-wall large-diameter high-grade pipeline steel for increasing low-temperature toughness and manufacturing method thereof
  • Thick-wall large-diameter high-grade pipeline steel for increasing low-temperature toughness and manufacturing method thereof
  • Thick-wall large-diameter high-grade pipeline steel for increasing low-temperature toughness and manufacturing method thereof

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Experimental program
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Embodiment 1

[0020] This embodiment is a method for manufacturing thick-walled, large-diameter, high-grade pipeline steel with improved low-temperature toughness, including the following steps:

[0021] (1) The weight percentage composition of the thick-walled large-diameter high-grade pipeline steel with low temperature toughness is: C: 0.039%, Si: 0.19%, Mn: 1.68%, P: 0.006%, S: 0.002%, Al: 0.025% , Nb: 0.051%, Ti: 0.0016%, Cr: 0.15%, Mo: 0.19%, Cu: 0.12%, Ni: 0.27%, Ca: 0.0015%, the balance is Fe and unavoidable impurities;

[0022] (2) Using a slab with a thickness of 320mm, the heating temperature of the slab is 1155°C, the heating time is 10.3min / cm in the thickness of the slab, and the soaking time is 56min;

[0023] (iii) 2 passes for phosphorus removal, including 1 pass for rough rolling and 1 pass for finish rolling;

[0024] (iv) Increase the reduction rate of the final pass of rough rolling, the reduction rate of the final pass of rough rolling is greater than 25%, and the thi...

Embodiment 2

[0030] This embodiment is a method for manufacturing thick-walled, large-diameter, high-grade pipeline steel with improved low-temperature toughness, including the following steps:

[0031] (1) The weight percentage composition of the thick-walled large-diameter high-grade pipeline steel with low temperature toughness is: C: 0.043%, Si: 0.217%, Mn: 1.66%, P: 0.006%, S: 0.001%, Al: 0.020% , Nb: 0.052%, Ti: 0.009%, Cr: 0.13%, Mo: 0.17%, Cu: 0.15%, Ni: 0.26%, Ca: 0.001%, the balance is Fe and unavoidable impurities;

[0032] (2) Using a slab with a thickness of 320mm, the heating temperature of the slab is 1167°C, the heating time is 11min / cm in the thickness of the slab, and the soaking time is 58min;

[0033] (iii) 2 passes for phosphorus removal, including 1 pass for rough rolling and 1 pass for finish rolling;

[0034] (iv) Increase the reduction rate of the final pass of rough rolling, the reduction rate of the final pass of rough rolling is greater than 25%, and the thickn...

Embodiment 3

[0040] This embodiment is a method for manufacturing thick-walled, large-diameter, high-grade pipeline steel with improved low-temperature toughness, including the following steps:

[0041] (1) The weight percentage composition of the thick-walled large-diameter high-grade pipeline steel with low temperature toughness is: C: 0.044%, Si: 0.218%, Mn: 1.67%, P: 0.007%, S: 0.002%, Al: 0.036% , Nb: 0.054%, Ti: 0.011%, Cr: 0.12%, Mo: 0.17%, Cu: 0.13%, Ni: 0.28%, Ca: 0.0020%, the balance is Fe and unavoidable impurities;

[0042] (2) Using a slab with a thickness of 320mm, the heating temperature of the slab is 1158°C, the heating time is 12min / cm in the thickness of the slab, and the soaking time is 57min;

[0043] (iii) 2 passes for phosphorus removal, including 1 pass for rough rolling and 1 pass for finish rolling;

[0044] (iv) Increase the reduction rate of the final pass of rough rolling, the reduction rate of the final pass of rough rolling is greater than 25%, and the thick...

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Abstract

The invention relates to a manufacturing method of thick-wall large-diameter high-grade pipeline steel for increasing the low-temperature toughness. A section casting blank of which the thickness is 320 mm is adopted, the blank heating is reasonably improved, the rolling schedule is optimized, and the laminar cooling process is improved, so that different deformation storage energy and grain boundary mobility are guaranteed, the tissue grain size is effectively refined so as to obtain bainite and acicular ferrite with uniform tissues, the stable tissues and performance are guaranteed, the performance requirement of the wide thick high-grade pipeline steel is satisfied, and economic benefits are obvious.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and relates to a production process for improving low-temperature drop hammer of large-diameter pipeline steel, in particular to a thick-walled large-diameter high-grade pipeline steel with improved low-temperature toughness and a manufacturing method thereof. Background technique [0002] The thick-walled large-diameter pipeline steel for oil transportation (φ1422×30.8mm thick-walled large-diameter pipeline steel) is a high-end product of pipeline steel, which requires a large pipe diameter and meets the requirements of low-temperature service. Currently, the existing domestic technology cannot make breakthroughs and improve The barrier of low temperature toughness of this species. In the prior art, the manufacturing method of thick-walled large-diameter high-grade pipeline steel cannot form fine bainite and true ferrite structure, and cannot effectively eliminate the banded structure in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C22C38/50C22C38/48C22C38/44C22C38/42C22C33/04B21C37/06C21D8/10
CPCB21C37/06C21D8/105C21D2211/002C21D2211/005C22C33/04C22C38/002C22C38/42C22C38/44C22C38/48C22C38/50C22C38/58C21D8/02C22C38/38
Inventor 翟冬雨姜金星杜海军员强鹏殷杰张媛钰
Owner NANJING IRON & STEEL CO LTD
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