Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Titanium micro-alloyed 400MPa grade high-strength steel bar and production method thereof

A high-strength steel bar and micro-alloying technology, which is applied in the field of iron and steel metallurgy micro-alloying, can solve the problems of high production cost, resource shortage, and occupation of profit margins, so as to improve yield strength and tensile strength, reduce phase transition temperature, Effect of grain size refinement

Active Publication Date: 2012-10-03
PANZHIHUA GANGCHENG GROUP
View PDF2 Cites 33 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the production cost of vanadium and its alloys, niobium and its alloys is relatively high, which not only squeezes the profit margin of enterprises, but also causes the shortage of vanadium and niobium resources, which is not conducive to the production and application of 400MPa high-strength steel bars and earthquake-resistant steel bars.
[0004] The Panxi area is rich in vanadium and titanium resources. The use of vanadium to strengthen steel bars by micro-alloy carbonitride precipitation has been widely used, and the use of micro-titanium treatment to refine the austenite grains of steel bars has also been applied, but the use of titanium to strengthen steel bars has been widely used. Precipitation strengthening of microalloyed carbonitrides has not been reported

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
  • Titanium micro-alloyed 400MPa grade high-strength steel bar and production method thereof
  • Titanium micro-alloyed 400MPa grade high-strength steel bar and production method thereof
  • Titanium micro-alloyed 400MPa grade high-strength steel bar and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0033] The preparation method of the above-mentioned titanium microalloyed 400MPa grade high-strength steel bar comprises the following steps:

[0034] a. Smelt steelmaking raw materials into crude steel liquid, tap steel, and carry out deoxidation and alloying during the tapping process;

[0035] b. The molten steel after tapping is sent to the refining furnace for refining and composition fine-tuning, so that it meets the requirements of the steel bar composition and then casts to obtain a billet for rolling steel bars;

[0036]c. Heat the rolled steel billet to 1100-1300°C and keep it warm for 30-150 minutes, then roll it, and finish rolling when it reaches 750-950°C, and air-cool the rolled steel bar to room temperature to obtain titanium micro Alloyed 400MPa high-strength steel bars;

[0037] Among them, alloying of titanium is performed during tapping and after deoxidation, or during refining.

[0038] The invention strictly controls the heating temperature and holding...

Embodiment 1

[0047] (1) Using slag iron as raw material to produce HRB400 steel bars, smelting into crude steel through electric furnace through slag making, oxygen blowing and other measures, the crude steel contains [C]0.16%, [P]0.017%, [S]0.073% , [N]72ppm, a[o]73ppm, the temperature is 1683 ℃, and then the steel is tapped, and deoxidation alloying is carried out during the tapping process, and the titanium passes through the bulk Ti-25wt%Si-10wt%Fe master alloy with a particle size of 15mm After adding, the molten steel after deoxidation and alloying is sent to LF furnace for refining and composition fine-tuning, and the obtained molten steel is sent to billet continuous casting, and the composition is shown in Table 1.

[0048] (2) Heat the billet to 1200°C for 1 hour.

[0049] (3) Air-cool or water-cool the above-mentioned heated slab to 1050°C, and then carry out rolling, and the final rolling temperature is 850°C.

[0050] (4) Air-cool the hot-rolled steel bars to room temperature...

Embodiment 2

[0052] (1) Using slag steel as raw material to produce HRB400, through slag making, oxygen blowing and other measures, it is smelted into crude molten steel in electric furnace. Crude molten steel contains [C]0.11%, [P]0.023%, [S]0.078%, [N]69ppm, a[o]62ppm, temperature 1681°C, the crude molten steel meets the requirements and then tapped. Deoxidation alloying is carried out during the tapping process, and titanium is added in the form of Ti-30wt%Si-10wt%Fe cored wire. The molten steel after deoxidation and alloying is sent to LF furnace for refining and composition fine-tuning, and the obtained molten steel is sent to billet continuous casting. The composition is shown in Table 1.

[0053] (2) Heat the billet to 1200°C for 1 hour.

[0054] (3) Air-cool or water-cool the above-mentioned heated slab to 1030°C, and then carry out rolling, and the final rolling temperature is 830°C.

[0055] (4) Air-cool the hot-rolled steel bars to room temperature.

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 hot-rolled 400MPa grade high-strength steel bar for reinforced concrete and a production method for the steel bar, and belongs to the technical field of micro-alloying of ferrous metallurgy. The steel in the steel bar comprises the following chemical components in percentage by weight: 0.16 to 0.25 percent of C, 0.20 to 0.80 percent of Si, 1.20 to 1.50 percent of Mn, 0.02 to 0.06 percent of Ti, less than or equal to 0.01 percent of N, less than or equal to 0.045 percent of S, less than or equal to 0.045 percent of P, and the balance of Fe and inevitable impurities. The preparation method for the steel bar comprises the following steps of: a, smelting crude molten steel, tapping, deoxidizing and alloying; b, refining, finely regulating the components, and pouring; and c, hot rolling, wherein titanium is alloyed in the tapping process and after deoxidizing or in the refining process. By using the principle that the titanium plays a role in precipitation and reinforcement in the steel, the mechanical properties of the steel such as yield strength and tensile strength are improved, and the property requirement of the 400MPa grade high-strength steel bar is met..

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy microalloying, and in particular relates to a hot-rolled 400MPa high-strength steel bar for reinforced concrete and a production method thereof. Background technique [0002] At present, my country is in a period of rapid industrialization and urbanization, and the construction industry is developing rapidly to large-scale. The construction industry is developing toward large scale. In order to improve the safety of large buildings, the construction industry at home and abroad generally uses high-strength, high-weldability hot-rolled ribbed steel bars instead of ordinary steel bars. In addition, with the introduction of policies to promote the use of high-strength steel bars in my country, low-strength steel bars below 335 MPa such as HRB335 will be gradually eliminated, and hot-rolled ribbed steel bars of HRB400 and above levels will be vigorously developed. The newly revised na...

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 Applications(China)
IPC IPC(8): C22C38/14C21D8/06
Inventor 敖进清雍岐龙汪波许立志杨勇孙新军李昭东
Owner PANZHIHUA GANGCHENG GROUP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com