High-strength and high-toughness hot-rolled yoke steel with yield strength larger than or equal to 750MPa and production method

A yield strength, high-strength technology, applied in high-strength and high-toughness hot-rolled yoke steel and production fields with yield strength ≥ 750MPa, to achieve a good matching effect

Active Publication Date: 2016-04-20
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

However, this level of toughness steel can no longer adapt to and meet the current generator requirements of lar

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-strength and high-toughness hot-rolled yoke steel with yield strength larger than or equal to 750MPa and production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0030] The present invention is described in detail below:

[0031] Table 1 is the chemical composition value list (wt%) of steel of the present invention and comparative example;

[0032] Table 2 is a list of main process parameter values ​​and performance testing of the steel of the present invention and comparative examples.

[0033] Each implementation of the present invention is produced according to the following steps:

[0034] 1) Casting into slabs after molten iron desulfurization, converter top-bottom composite blowing, and vacuum treatment;

[0035] 2) Heating the slab, the heating temperature is 1280~1350℃, and the soaking time is 100~150min;

[0036] 3) Carry out rough rolling, and control the end temperature of rough rolling to not be lower than 1100°C;

[0037] 4) Carry out finish rolling, the reduction rate of F1 and F2 passes is 50%, the reduction rate of F7 is set to 35-40%, and the final rolling temperature is controlled at 800-850°C;

[0038] 5) Carry out...

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

No PUM Login to view more

Abstract

The invention relates to high-strength and high-toughness hot-rolled yoke steel with the yield strength larger than or equal to 750MPa. The high-strength and high-toughness hot-rolled yoke steel comprises the following components in percentage by weight: 0.015-0.030 percent of C, at most 0.15 percent of Si, 1.80-2.10 percent of Mn, at most 0.015 percent of P, at most 0.005 percent of S, 0.035-0.075 percent of Ti, 0.02-0.07 percent of Nb, 0.02-0.10 percent of Als and at most 0.005 percent of N. The production method of the high-strength and high-toughness hot-rolled yoke steel comprises the following steps: after molten iron desulphurization, converter combined blowing and vacuum treatment, pouring; heating plate billets; rough rolling; finish rolling; laminar flow cooling; coiling. The yield strength is larger than or equal to 750MPa, the tensile strength is larger than or equal to 800MPa, the elongation A is larger than or equal to 11percent, -40 DEG C impact energy KV2 is larger than or equal to 60J, the magnetic inductivity B50 is larger than or equal to 1.50, and all the parameters can meet the demand of high-strength and high-magnetic-inductivity steel for a super-huge type hydro-generator rotor yoke with high capacity per unit.

Description

technical field [0001] The invention relates to a hydraulic generator rotor yoke steel and a production method thereof, in particular to a high-strength and high-toughness hot-rolled yoke steel with a yield strength ≥ 750 MPa and a production method thereof. Background technique [0002] With the implementation of the "Western Development" strategy and the "West-to-East Electricity Transmission" strategy determined by our country, and in accordance with the national guideline of "vigorously developing hydropower", a large number of large-scale hydropower projects will start construction in the next few decades. With the development of the hydropower industry, the performance requirements for the yoke steel plate used in the key part of the rotor yoke of the hydro-generator have also increased from simple high strength to high toughness, especially in severe cold regions. The service environment of steel is harsh, and once the material breaks during the operation of the rotor...

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
IPC IPC(8): C22C38/04C22C38/14C22C38/12C22C38/06C21D8/12
CPCC21D8/1222C22C38/04C22C38/06C22C38/12C22C38/14C21D2211/001C21D2211/005
Inventor 宋畅杜明马玉喜陶军晖徐进桥高智平陶文哲郭斌刘昌明
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