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

Method for manufacturing 590MPa stage low yield ratio low carbon equivalent weight steel plate for building

A low-yield-strength ratio, manufacturing method technology, applied in the direction of manufacturing tools, temperature control, metal rolling, etc., can solve the problems of increasing steel cost, steel smelting and continuous casting difficulties, etc., to increase strength, improve work hardening ability, The effect of good formability

Inactive Publication Date: 2010-01-06
NORTHEASTERN UNIV LIAONING
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] JFE Iron and Steel Company of Japan introduced the manufacturing method of 590MPa high-performance construction steel in JP2005068478A, pages 45-52 of JFE Technical Report No.5 and NipponSteel Iron and Steel Company in pages 53-58 of Nippon Steel Technical Report No.90. All need to add a certain amount of precious alloying elements such as Cu, Cr, Ni, Mo, especially for our country, Cu, Ni, Mo are all scarce elements, which will relatively increase the cost of steel, while Cu, Cr elements It also brings difficulties to the smelting and continuous casting of 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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for manufacturing 590MPa stage low yield ratio low carbon equivalent weight steel plate for building
  • Method for manufacturing 590MPa stage low yield ratio low carbon equivalent weight steel plate for building

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0019] Example 1: The chemical composition of the selected high-performance steel plate for construction, the weight percentage is: C 0.15%, Si 0.37%, Mn1.41%, Alt 0.0295%, P 0.014%, S 0.005%, Nb 0.031%, V 0.081% , the rest is iron Fe, the steel is smelted on a 210-ton converter, and continuously cast into a continuous casting slab of 220×1800×2450, the continuous casting slab is heated to 1200°C, rolled on a 450 rolling mill, and the first-stage rolling temperature The control is 1150°C, the temperature of the first-stage finish rolling is controlled at 1050°C, and the rolling is carried out for 8 passes. The thickness of the intermediate billet is 50mm, and then the second-stage rolling is carried out. ℃, rolling for 5 passes; the above-mentioned billets after rolling are controlled and cooled to room temperature at a cooling rate of 3-6 ℃ / s; quenched at 765 ℃, and tempered at a high temperature of 500 ℃. The finally obtained high-performance construction steel has a thickne...

example 2

[0020] Example 2: The chemical composition of selected high-performance steel plates for construction, the weight percentage is: C 0.15%, Si 0.37%, Mn1.41%, Alt0.0295%, P 0.014%, S 0.005%, Nb 0.031%, V 0.081 %, the rest is iron Fe, the steel is smelted on a 210-ton converter, and continuously cast into a continuous casting slab of 220×1800×2450, the continuous casting slab is heated to 1200°C, rolled on a 450 rolling mill, and rolled in one stage The temperature is controlled at 1150°C, the temperature of the first-stage finish rolling is controlled at 1040°C, and the rolling is carried out for 8 passes, and the thickness of the intermediate billet is 50mm. Rolling at 870°C for 5 passes; the above-mentioned billet after rolling is controlled and cooled to room temperature at a cooling rate of 3-6°C / s; quenching at 810°C and tempered at 500°C. The finally obtained high-performance construction steel has a thickness of 13 mm, a metallographic structure of 40%, a tempered sorbite...

example 3

[0021]Example 3: The chemical composition of the selected high-performance steel plate for construction, the weight percentage is: C 0.15%, Si 0.37%, Mn1.41%, Alt 0.0295%, P 0.014%, S 0.005%, Nb 0.031%, V 0.081% , the rest is iron Fe, the steel is smelted on a 210-ton converter, and continuously cast into a continuous casting slab of 220×1800×2450, the continuous casting slab is heated to 1200°C, rolled on a 450 rolling mill, and the first-stage rolling temperature The control temperature is 1150°C, the final rolling temperature is controlled at 1060°C in the first stage, and the rolling is carried out for 6 passes, and the thickness of the intermediate billet is 88mm. ℃, rolling for 4 passes; the above-mentioned billet after rolling is controlled and cooled to room temperature at a cooling rate of 4-8 ℃ / s; quenched at 785 ℃, and tempered at a high temperature of 500 ℃. The finally obtained high-performance steel for construction has a thickness of 40 mm, and its metallographi...

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
strengthaaaaaaaaaa
Login to View More

Abstract

The invention relates to a manufacture method for a 590MPa grade low yield ratio and low carbon equivalent constructional steel plate. The key point is that the weight percentage of the chemical ingredients of the steel is selected as follows: C 0.15, Si 0.37, Mn 1.41, Nb 0.031, V 0.081, Alt0.0298, P 0.014, S 0.005, and the rest is Fe; the following controlled rolling and controlled cooling-warming treatment technology system is implemented: the heating temperature of the steel billet is 1200 DEG C with a tolerance of 10 DEG C; during implementing the controlled rolling technology, the finish rolling temperature in the first stage is 1040 DEG C to 1060 DEG C, the thickness of the steel billet to be heated is 46mm to 90mm, the initial billet temperature in the second stage is 940 to 910 DEG C, the finish rolling temperature in the second stage is 840 to 870 DEG C; the rolled steel is cooled down to room temperature at the cooling speed of 3 to 8 DEG C per second after the rolling; quenching is performed at the temperature of 760 to 810 DEG C, and tempering is performed at the temperature of 500 DEG C. The high performance constructional microstructure is the dual phase structure of tempered sorbite / bainite and block-shaped ferrite; the steel plate has comparatively high comprehensive mechanical properties and weldability, low cost, and wide development prospect. The invention relates to a manufacture method for a 590MPa grade low yield ratio and low carbon equivalent constructional steel plate. The key point is that the weight percentage of the chemical ingredients of the steel is selected as follows: C 0.15, Si 0.37, Mn 1.41, Nb 0.031, V 0.081, Alt0.0298, P 0.014, S 0.005, and the rest is Fe; the following controlled rolling and controlled cooling-warming treatment technology system is implemented: the heating temperature of the steel billet is 1200 DEG C with a tolerance of 10 DEG C; during implementing the controlled rolling technology, the finish rolling temperature in the first stage is 1040 DEG C to 1060 DEG C, the thickness of the steel billet to be heated is 46mm to 90mm, the initial billet temperature in the second stage is 940 to 910 DEG C, the finish rolling temperature in the second stage is 840 to 870 DEG C; the rolled steel is cooled down to room temperature at the cooling speed of 3 to 8 DEG C per second after the rolling; quenching is performed at the temperature of 760 to 810 DEG C, and tempering is performed at the temperature of 500 DEG C. The high performance constructional microstructure is the dual phase structure of tempered sorbite / bainite and block-shaped ferrite; the steel plate has comparatively high comprehensive mechanical properties and weldability, low cost, and wide development prospect.

Description

technical field [0001] The invention relates to a preparation method of low-alloy high-strength steel, in particular to a preparation method of an economical 590MPa grade low-yield ratio low-carbon equivalent steel plate for construction. Background technique [0002] In recent years, building steel structures have developed rapidly. In particular, the emergence of high-rise steel structures has opened up a new field of architectural steel structures. However, with the rapid development of building steel structures, higher and higher requirements are put forward for building steel, and building steel is developing in the direction of high strength, high performance and large size. In order to ensure the seismic performance of steel structures, construction steel must have the characteristics of low yield ratio (YR), narrow yield point, lamellar tear resistance and good weldability, which is the high performance required by construction steel. [0003] With the high-rise bu...

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): C22C33/00C22C38/12B21B1/22B21B37/74C21D9/52
Inventor 刘振宇唐帅孙庆强刘相华王国栋
Owner NORTHEASTERN UNIV LIAONING