Quenched and tempered low-yield ratio pipeline steel and preparation method thereof

A low yield ratio, pipeline steel technology, applied in the field of pipeline steel production, can solve the problems of low yield ratio and difficulty in controlling the drop weight performance.

Inactive Publication Date: 2015-06-03
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a quenched and tempered low yield ratio pipeline steel and its preparation method for the problems of low yield ratio and difficult control of drop hammer performance in the production process of pipeline steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] For 17.5mm pipeline steel, the final rolling temperature of the steel plate is 840-860°C, rapid water cooling after rolling, and the final cooling temperature is 520-560°C, to refine the original grains of the hot-rolled steel plate. Among them, the quenched and tempered low yield strength ratio pipeline steel includes the following components in weight percentage: C 0.08~0.12%, Si 0.15~0.35%, Mn 1.45~1.70%, P≤0.02%, S≤0.01%, Nb 0.030~ 0.050%, V 0.015-0.035%, Ti 0.050-0.075%, Mo 0-0.30%, and the balance is iron and unavoidable impurities.

[0021] Use thermal radiation heating roller hearth non-oxidation heating furnace, control the heating temperature in the two-phase area of ​​840 ℃ ~ 880 ℃, control the heating time in 30 ~ 45min, adopt sub-temperature quenching, can refine the grains, increase the grain boundaries, and retain some The ferrite that has not changed is used to improve the toughness of the steel plate and reduce the yield ratio of the steel plate; it is ...

Embodiment 2

[0026] For 22.2mm pipeline steel, the final rolling temperature of the steel plate is 830-850°C, rapid water cooling after rolling, and the final cooling temperature is 520-560°C, to refine the original grains of the hot-rolled steel plate. Among them, the quenched and tempered low yield strength ratio pipeline steel includes the following components in weight percentage: C 0.08~0.12%, Si 0.15~0.35%, Mn 1.45~1.70%, P≤0.02%, S≤0.01%, Nb 0.030~ 0.050%, V 0.015-0.035%, Ti 0.050-0.075%, Mo 0.10-0.30%, and the balance is iron and unavoidable impurities.

[0027] Use thermal radiation heating roller hearth non-oxidation heating furnace, control the heating temperature in the two-phase area of ​​840 ℃ ~ 880 ℃, control the heating time in 40 ~ 60 minutes, adopt sub-temperature quenching, can refine the grains, increase the grain boundaries, and retain some Unchanged ferrite to improve the toughness of the steel plate and reduce the yield ratio of the steel plate; add an appropriate am...

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Abstract

The invention belongs to the technical field of pipeline steel production and particularly relates to a quenched and tempered low-yield ratio pipeline steel and a preparation method thereof. The quenched and tempered low-yield ratio pipeline steel comprises the following components by weight percentage: 0.04-0.12% of C, 0.10-0.35% of Si, 1.30-1.70% of Mn, less than or equal to 0.02% of P, less than or equal to 0.01% of S, 0.020-0.060% of Nb, 0.010-0.040% of V, 0.040-0.080% of Ti, 0-0.30% of Mo and the balance of iron and unavoidable impurities. The pipeline steel is produced through a quenching and tempering process, the heat treatment heating temperature is controlled between two phase regions and the production process is unique; all performances meet the requirement of the pipeline steel, the yield ratio is less than 0.85 and the drop weight tear shearing area at -15 DEG C is greater than 85%.

Description

technical field [0001] The invention belongs to the technical field of pipeline steel production, and in particular relates to a quenched and tempered low yield ratio pipeline steel and a preparation method thereof. Background technique [0002] Steel for oil and natural gas transmission pipelines is an important steel type that integrates equipment and technology. It is a symbol of the technical level of the steel industry and a manifestation of the comprehensive strength of steel companies. Since pipeline steel operates under high pressure in areas with complex geographical environments and low-cold climate conditions or on the seabed, long-distance transportation of oil and natural gas requires high safety requirements during transportation, and the yield ratio represents the material from deformation to fracture. The deformation margin is usually used as an important parameter to measure the safety of the pipeline, so the pipeline steel is required to have the characteri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C21D8/02
Inventor 何绪友姜伟李延芝毕于顺宋雷明孙岭隗勇时义祥王杰曹运涛郭玉香张尔康
Owner SHANDONG IRON & STEEL CO LTD
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