400 MPa level fine grain threaded reinforcing bar and manufacturing method thereof

A technology of threaded steel bars and manufacturing methods, applied in temperature control, building construction, structural elements, etc., can solve problems such as difficult production of precious alloy elements

Active Publication Date: 2019-06-25
NORTHEASTERN UNIV
View PDF10 Cites 17 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It solves the problems of adding a large amount of precious alloy elements or the difficulty of controlled rolling production in the production of steel bars, and realizes the refinement of steel bar grain size and the improvement of strength under the conditions of reducing alloy costs and simplifying the rolling process

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
  • 400 MPa level fine grain threaded reinforcing bar and manufacturing method thereof
  • 400 MPa level fine grain threaded reinforcing bar and manufacturing method thereof
  • 400 MPa level fine grain threaded reinforcing bar and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] The chemical composition of a 400MPa grade fine-grained threaded steel bar, the mass fraction of each composition, and the relational expression satisfied by each element are shown in Table 1. The number of inclusions is shown in Table 2.

[0065] A kind of manufacturing method of 400MPa grade fine-grain threaded steel bar, comprises the following steps:

[0066] (1) Melting molten iron into molten steel in a converter, the tapping temperature is 1650°C, the mass fraction of carbon is 0.12%, the mass fraction of oxygen is 0.045%, the mass fraction of phosphorus is 0.021%, and the mass fraction of sulfur is 0.025%. Silicon and manganese are added during the process of 1 / 3 to 3 / 4 of the steel amount to obtain molten steel containing silicon and manganese;

[0067] (2) According to the formation conditions of inclusions in 400MPa grade fine-grained threaded steel bars, when the temperature of molten steel containing silicon and manganese reaches 1620°C, the mass fraction ...

Embodiment 2

[0073] The chemical composition of a 400MPa grade fine-grained threaded steel bar, the mass fraction of each composition, and the relational expression satisfied by each element are shown in Table 1. The number of inclusions is shown in Table 2.

[0074] A kind of manufacturing method of 400MPa grade fine-grain threaded steel bar, comprises the following steps:

[0075] (1) melting molten iron and steel scrap into molten steel in a converter, the tapping temperature is 1680°C, the mass fraction of carbon is 0.06%, the mass fraction of oxygen is 0.07%, the mass fraction of phosphorus is 0.01%, and the mass fraction of sulfur is 0.02%, Silicon and manganese are added during tapping 1 / 3 to 3 / 4 to obtain molten steel containing silicon and manganese;

[0076] (2) According to the formation conditions of inclusions in 400MPa grade fine-grained threaded steel bars, when the temperature of molten steel containing silicon and manganese reaches 1645°C, the mass fraction of dissolved o...

Embodiment 3

[0081] The chemical composition of a 400MPa grade fine-grained threaded steel bar, the mass fraction of each composition, and the relational expression satisfied by each element are shown in Table 1. The number of inclusions is shown in Table 2.

[0082] A kind of manufacturing method of 400MPa grade fine-grain threaded steel bar, comprises the following steps:

[0083] (1) Melting molten iron and steel scrap into molten steel in an electric furnace, the tapping temperature is 1634°C, the mass fraction of carbon is 0.14%, the mass fraction of oxygen is 0.045%, the mass fraction of phosphorus is 0.033%, and the mass fraction of sulfur is 0.015%, Silicon and manganese are added during tapping 1 / 3 to 3 / 4 to obtain molten steel containing silicon and manganese;

[0084] (2) According to the formation conditions of inclusions in 400MPa grade fine-grain threaded steel bars, when the temperature of molten steel containing silicon and manganese reaches 1610°C, the mass fraction of di...

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 400 MPa level fine grain threaded reinforcing bar and a manufacturing method thereof, and belongs to the field of threaded reinforcing bar production. The reinforcing bar comprises, by mass percentage, 0.20-0.25% of C, 0.3-0.8% of Si, 1.2-1.6% of Mn, 0.01-0.04% of P, 0.01-0.04% of S, 0.004-0.02% of Ti, 0.001-0.08% of Cr, 0.0001-0.008% of V, 0.0001-0.008% of Nb, 0.0001-0.008% of Al, 0.003-0.01% of O, 0.003-0.01% of N and the balanced of Fe and unavoidable impurities; manganese silicate inclusion, titanium oxide manganese sulfide complex inclusion, manganese sulfide complex inclusion and other unavoidable inclusions are included. The method comprises the steps of molten steel smelting, inclusion controlling, continuous casting, continuous casting blank heating and rolling cooling. The method has the advantages that optimizing designing is conducted on components and the inclusions, smelting and rolling are combined, a reinforcing mechanism of using the inclusions to induce fine crystalline to improve the strength of the reinforcing bar, the addition of precious alloy elements is reduced, and therefore the low-cost high-quality production of the threaded reinforcing bars is achieved.

Description

technical field [0001] The invention belongs to the technical field of threaded steel bar production, and in particular relates to a 400MPa fine-grained threaded steel bar and a manufacturing method thereof. Background technique [0002] With the rapid development of my country's industrialization and urbanization, the demand for high-quality construction steel in the fields of infrastructure construction and construction has increased significantly. In order to further improve the quality of construction steel, promote energy conservation and emission reduction, eliminate backward production capacity, and meet the needs of construction, transportation, engineering and other fields, my country began to implement the new national standard for hot-rolled ribbed steel bars GB / T 1499.2-2018. The new standard puts forward new requirements for the production process, metallographic structure and strength level of steel bars. At present, increasing the strength of steel bars is m...

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): C22C33/04C22C38/02C22C38/04C22C38/06C22C38/24C22C38/26C22C38/28E04C5/03B21B37/74
CPCB21B37/74C22C33/04C22C38/02C22C38/04C22C38/06C22C38/24C22C38/26C22C38/28E04C5/03
Inventor 袁国王超康健李振垒王国栋
Owner NORTHEASTERN UNIV
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