High-toughness and low-yield-ratio quenched and tempered steel plate used in low-temperature environment and manufacturing method of high-toughness and low-yield-ratio quenched and tempered steel plate

A quenched and tempered steel plate, low-temperature environment technology, applied in the chemical industry, can solve the problems of low production efficiency, low control level of steel plate thickness precision, etc., achieve deterioration of welding performance, promote fine and multi-orientation distribution, improve strength, toughness and anisotropy Effect

Active Publication Date: 2016-03-30
武汉钢铁有限公司
View PDF7 Cites 22 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • High-toughness and low-yield-ratio quenched and tempered steel plate used in low-temperature environment and manufacturing method of high-toughness and low-yield-ratio quenched and tempered steel plate
  • High-toughness and low-yield-ratio quenched and tempered steel plate used in low-temperature environment and manufacturing method of high-toughness and low-yield-ratio quenched and tempered steel plate
  • High-toughness and low-yield-ratio quenched and tempered steel plate used in low-temperature environment and manufacturing method of high-toughness and low-yield-ratio quenched and tempered steel plate

Examples

Experimental program
Comparison scheme
Effect test

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 examples;

[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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
yield strengthaaaaaaaaaa
tensile strengthaaaaaaaaaa
yield ratioaaaaaaaaaa
Login to view more

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap