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Quenched and tempered steel plate with high strength, toughness and low yield ratio for low temperature environment and preparation method thereof

A technology of quenched and tempered steel plate and low yield strength ratio is applied in the field of quenched and tempered steel plate with high strength, toughness and low yield strength ratio for low temperature environment and its preparation. Strength ratio, the effect of promoting fine and multi-oriented distribution, and improving the strength of steel

Active Publication Date: 2017-05-24
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The steel plates involved in the above-mentioned patents are all produced in a single sheet by a medium plate or wide plate rolling mill, the production efficiency is low, and the control level of steel plate thickness accuracy is low

Method used

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  • Quenched and tempered steel plate with high strength, toughness and low yield ratio for low temperature environment and preparation method thereof
  • Quenched and tempered steel plate with high strength, toughness and low yield ratio for low temperature environment and preparation method thereof
  • Quenched and tempered steel plate with high strength, toughness and low yield ratio for low temperature environment and preparation method thereof

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Embodiment Construction

[0033] The present invention will be described in further detail below in conjunction with specific examples.

[0034] Table 1 is the value list of each embodiment of the present invention and comparative example;

[0035] Table 2 is the main process parameter list of each embodiment of the present invention and comparative example;

[0036] Table 3 is each embodiment of the present invention and comparative example mechanical property detection situation list;

[0037] Each embodiment of the present invention is produced according to the following steps:

[0038] (1) The reheating temperature of the slab is 1160-1190°C, the finishing temperature of the rough rolling is 1010-1030°C, the cumulative reduction rate in the rough rolling stage is ≥80%, the finishing rolling temperature is 850-880°C, and the steel coil is cooled The method is air cooling.

[0039] (2) The hot-rolled steel coil is flattened into a hot-rolled steel plate, which is quenched and tempered to obtain a ...

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Abstract

The invention discloses a high-toughness and low-yield-ratio quenched and tempered steel plate used in a low-temperature environment. The high-toughness and low-yield-ratio quenched and tempered steel plate comprises, by weight, 0.045-0.068% of C, 0.13-0.25% of Si, 1.55-1.74% of Mn, smaller than or equal to 0.020% of P, smaller than or equal to 0.0015% of S, 0.25-0.33% of Cr, 0.14-0.21% of Cu, 0.18-0.25% of Ni, 0.035-0.044% of Nb, 0.033-0.049% of V, 0.010-0.016% of Ti and the balance Fe and inevitable impurities. The invention further discloses a manufacturing method of the high-toughness and low-yield-ratio quenched and tempered steel plate used in the low-temperature environment. A proper number of alloy elements such as Cu, Cr and Ni are added to the steel plate on the basis of a low-C and high-Mn system, and Nb, V and Ti are adopted for microalloying. Due to a pass reduction schedule and an offline heat treatment regime in the hot rolling process are optimized, quenched and tempered type pipeline steel which is high in low-temperature-environment toughness and low in yield ratio and is used for a straight seam welded pipe is finally obtained.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a quenched and tempered steel plate with high strength and toughness and low yield ratio for low temperature environment and a preparation method thereof. Background technique [0002] Oil and natural gas are important energy sources for the development of the national economy, and their proportions in energy consumption are increasing day by day. At present, pipeline transportation is still the most economical, safe and efficient long-distance transportation method for oil and natural gas. As the exploration and development of oil and gas resources gradually advances to high-latitude and high-cold regions including the polar regions, the development of steel for long-distance transmission pipelines in low-temperature environments has become a hot spot. [0003] Long-distance transmission pipelines in low-temperature environments pass through seasonal or perennial perm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/12C22C38/14C22C38/18C22C38/02C22C38/04C21D8/02
CPCC21D8/0226C21D8/0247C22C38/02C22C38/04C22C38/12C22C38/14C22C38/18
Inventor 崔雷徐进桥郭斌孔君华李利巍邹航任池锦周银波徐锋刘小国
Owner 武汉钢铁有限公司
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