Unlock instant, AI-driven research and patent intelligence for your innovation.

Manufacturing method of increasing high strength flat-bulb steel low temperature impact properties percent of pass

A low-temperature impact and production method technology, applied in temperature control, workpiece surface treatment equipment, metal rolling, etc., can solve the problems of unqualified low-temperature impact performance of high-strength bulbous flat steel, low-quality section steel with low pass rate of initial test performance, etc., and achieve improved low-temperature Impact performance pass rate, reduce production cost, improve the effect of economic benefits

Inactive Publication Date: 2011-06-22
CHONGQING IRON & STEEL CO LTD
View PDF0 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the low pass rate of high-strength bulbous flat steel A36 and D36 has been perplexing the production of section steel. From the production situation, the pass rate of the initial test is only 87.8%. economic loss
[0010] 1. Widmanite structure and granular bainite in the steel are the main reasons for the unqualified low-temperature impact performance of high-strength bulbous flat steel;

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] In this embodiment, the production method for improving the qualified rate of low-temperature impact performance of high-strength bulbous flat steel includes rough rolling, finish rolling, final rolling and post-rolling cooling. The cooling speed control adopts stacking and moving air cooling on multiple steel cooling beds.

Embodiment 2

[0022] The production method for improving the pass rate of low-temperature impact performance of high-strength bulbous flat steel in this embodiment includes rough rolling, finish rolling, final rolling and post-rolling cooling. The cooling speed control adopts stacking and moving air cooling on multiple steel cooling beds; the qualified rate of low-temperature impact performance of the high-strength bulbous flat steel produced in this embodiment is higher and stable than that of other embodiments, and the qualified rate in the experiment reaches 100%.

Embodiment 3

[0024] In this embodiment, the production method for improving the qualified rate of low-temperature impact performance of high-strength bulbous flat steel includes rough rolling, finish rolling, final rolling and post-rolling cooling. The cooling speed control adopts stacking and moving air cooling on multiple steel cooling beds.

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 low temperature impact property qualified rate of high strength ball flat steel, which consist of steps of rough rolling, finish rolling, final rolling and cooling after rolling. The web temperature of the final rolling is ranging from 870 DEG C to 930 DEG C and the ball-end temperature is ranging from 910 DEG C to 990 DEG C. For cooling after rolling, air cooling is adopted. By controlling the final rolling temperature and speed of the cooling after rolling, the invention eliminates or reduces granular bainite and widmanstatten in themicrostructure of the ball flat steel, thereby greatly improving the low temperature impact property qualified rate of the high strength ball flat steel.

Description

technical field [0001] The invention relates to a production method of high-strength flat bulb steel, in particular to a production method for improving the qualified rate of low-temperature impact performance of high-strength flat bulb steel. Background technique [0002] High-strength bulb flat steel is a special profile for the shipbuilding industry. Due to the vigorous development of the domestic shipbuilding industry, the demand for bulb flat steel has also increased accordingly. However, the low pass rate of high-strength bulbous flat steel A36 and D36 has been perplexing the production of section steel. From the production situation, the pass rate of the initial test is only 87.8%. economic loss. According to statistical analysis, the main problem of high-strength bulbous flat steel is the unstable low-temperature impact performance, and the unqualified low-temperature impact performance is the main reason affecting the qualified rate of high-strength bulbous flat s...

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 Patents(China)
IPC IPC(8): B21B37/74B21B45/02B21B43/00C21D8/00B21B1/08
Inventor 曾兢肖亚郑建华向浪涛陈时学
Owner CHONGQING IRON & STEEL CO LTD