Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Method for improving low-temperature impact toughness of high strength thick steel plate

A low-temperature impact toughness and high-strength technology, applied in the direction of temperature control, etc., can solve the problems of high cost, low production efficiency, and low yield, and achieve uniform and stable impact toughness, increase processing time, and reduce dependence.

Inactive Publication Date: 2010-11-03
SHOUGANG CORPORATION
View PDF0 Cites 37 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the production of high-strength thick steel plates, die casting can be used to ensure the compression ratio of steel plates, but die casting has the characteristics of low yield, low production efficiency, and high cost, and the popularity of die casting in domestic medium and thick plate enterprises is relatively low. Low, cannot be an economical mode of production

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 thick steel plate
  • Method for improving low-temperature impact toughness of high strength thick steel plate
  • Method for improving low-temperature impact toughness of high strength thick steel plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] C≤0.15% in the chemical composition of the slab used in the present invention. The slab with a thickness of 250mm is cooled after being directly rolled on a medium and heavy plate rolling mill. The thickness of the steel plate after rolling is 80mm, and the compression ratio of the steel plate is 3.13. The rolled steel plate was quenched at 930°C, then quenched for the second time at 880°C, and tempered at a medium temperature of 550°C in a normalizing furnace. The structure of the surface and core of the steel plate after sub-temperature quenching is as attached figure 1 , figure 2 As shown, the surface and core of the tempered steel plate are as attached image 3 , Figure 4 shown.

[0024] Table 1 shows the properties of 40mm steel plates produced by normal production process using slabs of the same composition and thickness. The mechanical properties of the 80mm steel plate treated by the above process are shown in Table 2.

[0025] Table 240mm steel plate me...

Embodiment 2

[0031] Embodiment 2 On the basis of Embodiment 1, the compression ratio of the steel plate is further reduced, and a 150 mm thick steel plate is manufactured by using a 320 mm thick steel billet. C≤0.15% in the chemical composition of the billet. The steel billet is rolled to a thickness of 150mm at one time by direct rolling method on the plate rolling mill, and the compression ratio is 2.13. The steel plate was stacked and cooled for 48 hours after rolling, and the level I flaw detection was all qualified, indicating that the steel plate had no obvious internal defects. The 150mm thick steel plate is heated to 930°C for high-temperature quenching, then heated to 850°C for the second quenching, and finally high-temperature tempering at 650°C in a normalizing furnace. Figure 5 , Figure 6 , Figure 7 It is the structure of the surface, thickness 1 / 4 and core of the steel plate after sub-temperature quenching. Table 3 shows the mechanical properties of the 150mm steel plate...

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 discloses a production method for improving the low-temperature impact toughness of a high strength thick steel plate, and belongs to the technical field of medium and thick steel plate production. The steel comprises the following chemical compositions: 0.05 to 0.15 percent of C, 0.15 to 0.40 percent of Si, 0.90 to 1.60 percent of Mn, less than 0.01 percent of P, less than 0.01 percent of S, 0.10 to 0.80 percent of Ni, 0.1 to 0.5 percent of Mo, 0.0008 to 0.0015 percent of B, 0.01 to 0.06 percent of microalloy element Nb, 0.01 to 0.07 percent of V, 0.01 to 0.03 percent of Ti and the balance of Fe; the thick steel plate is produced by soft reduction technology in a continuous casting process under the condition that a compression ratio is less than 4.0; and by a heat treatment process which comprises the steps of quenching, quenching and tempering, the texture of the steel plate after double quenching is controlled to be a hybrid texture with a hard phase and a soft phase, and the requirements on steel plate strength and low-temperature toughness are met at the same time. Under a small compression ratio, the thick steel plate has the performance equivalent to that of a thin steel plate by the combination of the heat treatment process and texture control; and compared with the methods such as die casting, forging and the like, the method is simple and feasible, and has high yield and low production cost.

Description

technical field [0001] The invention belongs to the technical field of steel plate production, and in particular provides a method for improving the impact toughness of high-strength thick steel plates. The method of light reduction and two-stage quenching and tempering heat treatment is mainly used to improve the impact toughness of the high-strength steel plate and the impact toughness of the core under the condition that the compression ratio is less than or equal to 3. Background technique [0002] Usually, when the compression ratio of the steel plate is less than 4, the impact toughness of the steel plate deteriorates due to deformation penetration and insufficient grain refinement during the rolling process, especially the toughness of the core of the steel plate. In high-strength steel plates, especially steel plates used in complex stress situations such as multi-directional pressure, the impact toughness in the thickness direction of the steel plate is strictly req...

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): C21D8/02C21D1/18B21B37/74C22C38/14
Inventor 金茹吴斌宋增强张跃飞姜中行吴光蜀吕延春隋鹤龙刘建明刘印良田士平
Owner SHOUGANG CORPORATION
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
Eureka Blog
Learn More
PatSnap group products