Method for improving low-temperature impact toughness of high-strength steel hot rolled plate coil for engineering machines

A technology of low temperature impact toughness and engineering machinery, which is applied to the improvement of low temperature toughness of low-alloy high-strength engineering machinery steel, and the field of improving the low-temperature impact toughness of high-strength engineering machinery steel hot-rolled coils, and can solve the problems of low temperature impact toughness reduction, etc. Achieve the effect of improving toughness, reducing damage, and simple operation

Inactive Publication Date: 2011-09-28
HEBEI SHOUGANG QIAN AN IRON & STEEL CO LTD +1
View PDF3 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since hot-rolled coils do not have the same strong control and cooling means as medium and thick plates, it is often necessary to add more alloying elements. For example, the addition of Ti can reach m

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
  • Method for improving low-temperature impact toughness of high-strength steel hot rolled plate coil for engineering machines

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0011] The present invention will further describe the hot-rolled coil of 550MPa high-strength engineering machinery and its production method in combination with examples:

[0012] Table 1 lists the chemical composition of the present invention for producing 550Mpa high-strength engineering machinery steel hot-rolled coils. The production method is as follows: In the steelmaking plant, hot metal desulfurization, 210t converter smelting, LF furnace refining are used. Then cast the molten steel required in Table 1 into a slab with a section of 230mmX 1300~1800mm, and send it to the hot strip mill.

[0013] Table 1 The chemical composition of the present invention, wt%

[0014] Elementary

[0015] The main implementation points of the present invention include: 1. Adopt the hot delivery and hot charging process route, and the hot charging temperature is 520°C.

[0016] 2. It adopts two-stand rough rolling and six-stand finish rolling mode. The rough rolling stage adopts six-pass rol...

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 provides a method for improving the low-temperature impact toughness of a high-strength steel hot rolled plate coil for engineering machines, which belongs to the technical field of steel for engineering machines. The method adopts a hot feeding and hot loading process, and the control technical parameters in the process include a hot loading temperature, a pouring superheat degree and a drawing speed, wherein the hot loading temperature is 500 to 600 DEG C, the pouring superheat degree is 18 to 20 DEG C, and the drawing speed is controlled to be 1.2 to 1.4m/min. Production is carried out in a mode of coarsely rolling by two machine frames and finely rolling by six machine frames, six-pass rolling is adopted in a coarse rolling phase, six-pass fine rolling is adopted in a fine rolling phase, and the rolling reduction in a non-recrystallized areas of austenite is 65 to 70 percent. A front-end laminar flow cooling mode is adopted for quickly cooling to a target temperature after fine rolling, and the cooling speed is improved to 10 to 15DEG C/s. After being removed from the production line, the plate coil is cooled by wind to 100 DEG C and then by air to room temperature. The method has the advantages of ensuring high strength and high toughness at the same time, saving consumption and improving production efficiency.

Description

technical field [0001] The invention belongs to the technical field of steel for engineering machinery, and in particular relates to a method for improving the low-temperature impact toughness of hot-rolled coils of high-strength engineering machinery steel, which is applied to the improvement of low-temperature toughness of low-alloy high-strength engineering machinery steel. Background technique [0002] High-strength engineering machinery steel is a low-alloy high-strength steel based on C-Mn steel and added with microalloying elements such as Mo, Nb, V, and Ti. At present, high-strength steel plates are widely used in the construction machinery industry and coal mining machinery industry, and the required thickness is mainly 4-80mm. Among them, steel plates with a thickness below 20mm are mainly coiled flat products, and most of them are used in the construction machinery industry. It is used to manufacture crane arms, frames, etc.; steel plates with a thickness of more ...

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): B22D11/18C21D8/02
Inventor 张鹏程潘辉王晓东李明魏建全武军宽赵林王伦于千王学强周娜
Owner HEBEI SHOUGANG QIAN AN IRON & STEEL CO LTD
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