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

A kind of hot rolling process of rebar

A rebar and process technology, applied in the field of hot rolling of rebar, can solve the problems of unsatisfactory service performance, high cost of hot-rolled steel plate, low coiling temperature, etc., to save resources, improve strength and toughness, and avoid steel plate strength. the reducing effect of

Active Publication Date: 2022-03-18
江苏联峰实业有限公司
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, expensive alloy elements such as Cr and Ni are generally added in the above methods, so the cost of hot rolled steel sheets is still high
And some products adopt thin slab continuous casting and rolling process, low finishing temperature (such as 800 ℃), low coiling temperature (such as 320 ℃) ​​and conventional cooling process to introduce bainite or martensite into the final product structure Strengthening, and the microstructure of these finished products will change during processing, resulting in unsatisfactory performance of the product

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 1-3

[0027] Embodiment 1-3 all adopts following heat treatment mode:

[0028] The heat treatment of the hot-rolled ribbed steel bar includes: heating the hot-rolled ribbed steel to 550±20°C and keeping it warm for 3-5 hours; putting the hot-rolled ribbed steel after keeping it warm for 3-5 hours into water for water quenching ; Heat the hot-rolled ribbed steel after water quenching to 450±30° C., and keep it warm for 4 to 5 hours; put the hot-rolled ribbed steel after the heat preservation for 3 to 4 hours into water for water cooling. After the cast slab is rolled into hot-rolled ribbed steel, the hot-rolled ribbed steel is placed in the air for stack cooling.

Embodiment 1

[0030] The raw materials for the production of threaded steel are put into the converter for smelting, and are continuously cast into slabs after being refined in the refining furnace; at the same time, the continuous casting slabs are stacked and cooled to normal temperature under natural conditions; after cooling, use heating The equipment heats the continuous casting slab to 1250°C;

[0031] Put the heated continuous casting slab into a semi-continuous bar rolling mill for rolling, the temperature of the heating section is controlled at 1100-1170°C, and the temperature of the soaking section is controlled at 1100-1200°C; after rolling, the rolling Good rods are cooled to room temperature on a cooling bed;

[0032] Cut the cooled bars with a double ruler, the temperature during shearing is less than or equal to 200°C, and the cut bars with double rulers are fixed to length and have a flat head, and then put into the hopper for heat treatment;

[0033] Put the processed rods...

Embodiment 2

[0036] The raw materials for the production of threaded steel are put into the converter for smelting, and are continuously cast into slabs after being refined in the refining furnace; at the same time, the continuous casting slabs are stacked and cooled to normal temperature under natural conditions; after cooling, use heating The equipment heats the continuous casting slab to 1250°C;

[0037] Put the heated continuous casting slab into a semi-continuous bar rolling mill for rolling, the temperature of the heating section is controlled at 1150-1170°C, and the temperature of the soaking section is controlled at 1100-1200°C; after rolling, the rolling Good rods are cooled to room temperature on a cooling bed;

[0038] Cut the cooled bars with a double ruler, the temperature during shearing is less than or equal to 200°C, and the cut bars with double rulers are fixed to length and have a flat head, and then put into the hopper for heat treatment;

[0039] Put the processed rods...

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
yield strengthaaaaaaaaaa
tensile strengthaaaaaaaaaa
yield strengthaaaaaaaaaa
Login to View More

Abstract

The invention provides a hot-rolling process of threaded steel, which relates to the field of metallurgy. A hot-rolled process of threaded steel comprises casting molten steel into billets, hot-rolling the cast billets into threaded steels, and hot-rolling is divided into preheating Section, heating section and soaking section, wherein the temperature of the preheating section is <800°C, the temperature of the heating section is 1080-1180°C, and the temperature of the soaking section is 1100-1220°C; finally, heat treatment is performed on the hot-rolled rebar. The microstructure of the hot-rolled ribbed steel bar is ferrite structure and pearlite structure. The hot-rolled ribbed steel bar prepared by the production method of the invention has excellent yield strength, tensile strength and elongation, and is widely used in bridges and car boxes.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a hot rolling process for rebar. Background technique [0002] At the current manufacturing process and technical level, the lightweight of bridges and rails is an important means to solve bridge overload and energy saving and emission reduction. The use of high-strength steel can improve the quality and service life of the product under the premise of reducing its own weight. At present, the main steel used in domestic bridges is 20MnSi, and the amount of high-strength bridges and car bodies is less. Compared with similar foreign products, the weight of bridges is 15-20% higher. [0003] In order to reduce production costs and improve component safety, the development of hot-rolled steel plates for high-strength bridges and automobile compartments has gradually been put on the agenda, and major steel mills have also carried out research work in this area. For example, Zhao Zhengzhi o...

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): B21B45/00B21B1/46B21B45/04B21B15/00B21B37/74C22C38/02C22C38/04C22C38/12C22C38/14C21D8/08C21D1/18
CPCB21B45/004B21B1/463B21B45/04B21B15/0007B21B37/74C22C38/02C22C38/04C22C38/12C22C38/14C22C38/002C21D8/08C21D8/065C21D1/18C21D2211/005C21D2211/009
Inventor 赵小军谷杰刘芳
Owner 江苏联峰实业有限公司