Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Non-quenched and tempered low-crack sensitivity steel plate with excellent low-temperature toughness, and production method thereof

A low-temperature toughness, non-quenched and tempered technology, applied in the field of low-alloy high-strength steel manufacturing, can solve problems such as unstable performance, affecting yield, and high load on the rolling mill, and achieve low welding crack sensitivity, excellent comprehensive performance, and excellent low-temperature toughness Effect

Inactive Publication Date: 2012-07-25
INST OF RES OF IRON & STEEL JIANGSU PROVINCE
View PDF7 Cites 20 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Before the present invention, the steel types involved in patents CN1396294, CN101096738, CN1932063 and CN101096738 were generally produced by heat treatment processes such as quenching and tempering or tempering, which resulted in high energy consumption and cost, and a large investment in ensuring the plate shape and surface quality
Patent CN101481774 adopts thermomechanical rolling and controlled cooling technology, which saves the subsequent heat treatment process and shortens the production process; but at the same time, this patented technology has the following two disadvantages: 1) The starting temperature of finish rolling is too low, the load of the rolling mill is large, and the plate 2) The added boron (B) is prone to segregation, which often leads to uneven chemical composition and unstable performance of the steel plate, affecting the yield
[0005] To sum up, there is currently no low crack sensitivity steel plate that can meet the requirements of F-class impact toughness on the market, especially the steel grade with a strength of 610MPa

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
  • Non-quenched and tempered low-crack sensitivity steel plate with excellent low-temperature toughness, and production method thereof
  • Non-quenched and tempered low-crack sensitivity steel plate with excellent low-temperature toughness, and production method thereof
  • Non-quenched and tempered low-crack sensitivity steel plate with excellent low-temperature toughness, and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The chemical composition of smelted billets is C 0.06%, Si 0.26%, Mn 1.48%, P 0.0076%, S 0.0045%, Ni 0.14%, Cr 0.18%, Mo 0.12%, Nb 0.03%, V 0.04%, Ti 0.016%, Al ≤0.03%, N 0.006, the balance is Fe and unavoidable impurities, welding crack sensitivity index Pcm=0.166%.

[0034] The heating temperature of the billet before rolling is 1180°C and holding for 2 hours; the rough rolling temperature is 1080°C, the thickness reduction is 220→110mm; the finishing rolling temperature is 860°C, the final rolling temperature is 820°C, and the thickness reduction 110→40mm (reduction rate 0.64); after rolling, the steel plate enters the accelerated cooling device, and is cooled to 475℃ at a cooling rate of 16℃ / s, and then the steel plate is cooled to room temperature with water and air.

[0035] The yield strength of the rolled plate is 544Mpa, the tensile strength is 647Mpa, and the elongation after fracture is 23.8%; the low temperature impact properties of the rolled plate are shown in ...

Embodiment 2

[0037] The chemical composition of the smelted billet is C 0.07%, Si 0.23%, Mn 1.52%, P 0.0082%, S 0.0042%, Ni 0.12%, Cr 0.18%, Mo 0.15%, Nb 0.02%, V 0.02%, Ti 0.012%, Al 0.03%, N 0.0055, the balance is Fe and unavoidable impurities, the welding crack sensitivity index Pcm=0.176%.

[0038] The heating temperature of the billet before rolling is 1180℃ and holding for 2 hours; the rough rolling temperature is 1080℃, the thickness reduction is 320→160mm; the finishing rolling temperature is 845℃, the final rolling temperature is 810℃, and the thickness reduction 160→60mm (reduction rate 0.62); after rolling, the steel plate enters the accelerated cooling device, and is cooled to 445℃ at a cooling rate of 22℃ / s, and then the steel plate is cooled to room temperature with water and air.

[0039] The yield strength of the rolled plate is 537Mpa, the tensile strength is 653Mpa, and the elongation after fracture is 25.8%; the low-temperature impact properties of the rolled plate are shown ...

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
tensile strengthaaaaaaaaaa
yield strengthaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention discloses a non-quenched and tempered low-crack sensitivity steel plate with excellent low-temperature toughness, and a production method of the non-quenched and tempered low-crack sensitivity steel plate. The steel comprises the following chemical compositions in percentage by weight: 0.05-0.09% of C, 0.15-0.30% of Si, 1.40-1.70% of Mn, less than or equal to 0.015% of P, less than or equal to 0.007% of S, 0.10-0.15% of Ni, 0.10-0.18% of Cr, 0.10-0.20% of Mo, 0.02-0.04% of Nb, 0.02-0.05% of V, 0.01-0.02% of Ti, less than or equal to 0.03% of Al, 0.003-0.007% of N, and the balance of Fe and unavoidable impurities, wherein the chemical compositions meet the conditions that Ti / N is within the range of 2.0-3.0, and Pcm is less than or equal to 0.18%. After a technology of controlling rolling and cooling is adopted, the additional heat treatment technology is not needed, and the produced steel plate is low in welding crack sensitivity, high in strength, excellent in low-temperature impact property and good in anti-cracking performance, so that the non-quenched and tempered low-crack sensitivity steel plate can be widely applied to energy engineering construction of an extremely cold area.

Description

Technical field [0001] The invention belongs to the field of low-alloy high-strength steel manufacturing, and particularly relates to a non-quenched and tempered low-crack-sensitive steel plate with excellent low-temperature toughness and a production method thereof. Background technique [0002] Because it can simplify the welding process and improve the welding efficiency, the low welding crack sensitivity steel is widely used in hydropower station penstocks, construction machinery, railways, bridges and high-rise buildings that require high weldability. [0003] At present, 610MPa grade steel plate (tensile strength>610MPa, yield strength>500MPa) is one of the most widely used varieties on the market. Generally, this type of steel plate can only meet the requirements of -20℃ impact energy (Grade D); With the rise of energy engineering construction in cold regions, the market urgently needs steel plates that can meet the requirements of -60℃ impact energy (F grade) to ensur...

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): C22C38/58C22C38/50C21D8/02
Inventor 郭慧英张宇许红梅何玉春王银柏
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com