Method for producing annealing-free hot rolling S50C plate and strip

A production method and an annealing-free technology, applied in the field of hot-rolled strips, can solve the problems of increased metal consumption, large energy consumption, and easy to cause waste products, etc., and achieve the effect of improving plasticity and toughness

Inactive Publication Date: 2012-04-18
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
View PDF2 Cites 31 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The spheroidizing annealing treatment of the background technology is not only complicated in process, long in production cycle, and consumes a large amount of energy, but also heat treatment

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

[0012] Embodiment 1: The product specification is an S50C hot-rolled coil with a thickness of 7.9 mm and a width of 1680 mm. Its chemical composition is: C: 0.47%, Si: 0.2%, Mn: 0.85%, P: 0.012%, S: 0.006%, and the balance is Fe. Main production process: hot metal pretreatment, smelting, thin slab continuous casting, continuous casting slab heating, rough rolling, finish rolling, coiling. Among them, the thin slab continuous casting process: molten steel is injected into the tundish through the sliding nozzle at the bottom of the ladle, the temperature of the molten steel in the tundish is: 1565°C, and the molten steel in the tundish is injected into the crystallizer through the flat submerged nozzle, and the crystallizer is long funnel-shaped crystallization device; the casting speed of the slab is 4.2m / min, and the thickness of the slab exiting the mold is 85mm. Rolling process control: billet entering furnace temperature is 900°C, slab heating temperature is 1100°C, rough ...

Embodiment 2

[0013] Embodiment 2: The product specification is an S50C hot-rolled coil with a thickness of 6.0 mm and a width of 1650 mm. Its chemical composition is: C: 0.50%, Si: 0.22%, Mn: 0.75%, P: 0.013%, S: 0.007%, and the balance is Fe. Main production process: hot metal pretreatment, smelting, thin slab continuous casting, continuous casting slab heating, rough rolling, finish rolling, coiling. Among them, the thin slab continuous casting process: molten steel is injected into the tundish through the sliding nozzle at the bottom of the ladle. The temperature of the molten steel in the tundish is: 1560 ° C. The molten steel in the tundish is injected into the crystallizer through the flat submerged nozzle. The crystallizer is long funnel-shaped crystallization device; the casting speed of the slab is 4.0m / min, and the thickness of the slab exiting the mold is 85mm. Rolling process control: billet entering furnace temperature is 880°C, slab heating temperature is 1120°C, rough rolli...

Embodiment 3

[0014] Embodiment 3: The product specification is a S50C hot-rolled coil with a thickness of 5.5 mm and a width of 1650 mm. Its chemical composition is: C: 0.53%, Si: 0.30%, Mn: 0.65%, P: 0.018%, S: 0.008%, and the balance is Fe. Main production process: hot metal pretreatment, smelting, thin slab continuous casting, continuous casting slab heating, rough rolling, finish rolling, coiling. Among them, the thin slab continuous casting process: molten steel is injected into the tundish through the sliding nozzle at the bottom of the ladle. The temperature of the molten steel in the tundish is: 1540°C. The molten steel in the tundish is injected into the crystallizer through the flat submerged nozzle. The crystallizer is long funnel-shaped crystallization device; the casting speed of the slab is 4.5m / min, and the thickness of the slab exiting the mold is 85mm. Rolling process control: billet entering furnace temperature is 950°C, slab heating temperature is 1150°C, rough rolling ...

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 relates to a method for producing an annealing-free hot rolling S50C plate and strip, belonging to the technical field of hot rolled plates and strips. The invention adopts the technical scheme that austenite rolling is adopted in rough rolling, a deformation-induced ferrite rolling and warm rolling combined process is adopted in finish rolling, temperature in a rough rolling region is controlled to be 960-1150 DEG C, accumulated screwdown rate is more than 50%, an intermediate blank obtained by the rough rolling is cooled by water and then enters into a finish rolling mill group, opening rolling temperature of a finish rolling mill is 760-850 DEG C, finished rolling temperature of the finish rolling mill is 650-750 DEG C, the accumulated screwdown rate is more than 50%, cooling rate after rolling is controlled to be 0.1-25 DEG C/s, and coiling temperature is controlled to be 550-700 DEG C. The austenite rolling during rough rolling is carried out, thus austenite crystals are refined; the deformation-induced ferrite rolling and warm rolling during finish rolling are carried out, thus ferrite is excessively separated out, carbide is modified in a deformation process, plasticity and toughness of steel are improved, the aim of direct moulding while annealing is eliminated is achieved, and a spheroidizing process before cold forming is eliminated.

Description

technical field [0001] The invention relates to a production method of an annealing-free hot-rolled S50C strip, which belongs to the technical field of hot-rolled strips. Background technique [0002] S50C hot-rolled strips are usually cold-formed to manufacture mechanical parts such as disc shears and springs, and their carbon content is usually 0.47% to 0.53%. The hot-rolled disc shear steel S50C produced according to conventional rolling technology has pearlite in its microstructure in a lamellar shape, so time-consuming and energy-consuming spheroidizing annealing treatment is required before cold forming to make the steel The morphology of carbides in the alloy changes from flake to spherical. The spheroidizing annealing treatment of the background technology is not only complicated in process, long in production cycle, and consumes a large amount of energy, but also heat treatment is likely to cause waste products, increase metal consumption, and pollute the environme...

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): C21D8/02
Inventor 冯运莉梁精龙张润东宋卓斐赵丹尹金枝
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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