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

Niobium-titanium composite micro-alloyed hotrolled deformed bar and production method thereof

A hot-rolled ribbed steel bar and micro-alloying technology, which is applied in the field of micro-alloyed construction steel, can solve the problems of affecting corporate profits, high prices of ferro-vanadium and ferro-niobium, and increasing production costs, so as to improve the product market. Competitiveness, increasing production technology routes, and increasing profits

Inactive Publication Date: 2012-04-04
LAIWU IRON & STEEL GRP
View PDF1 Cites 35 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to meet the needs of the market for HRB400 grade steel bars, my country initially produced 20MnSiV (HRB400) grade steel bars with vanadium microalloying technology, and has now developed to adopt vanadium, niobium or vanadium-niobium composite microalloying technology. The price of iron has remained high for a long time, and the production of HRB400 grade steel bars by single vanadium, niobium or vanadium-niobium composite microalloying technology will significantly increase the production cost and seriously affect the profit of the enterprise

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
  • Niobium-titanium composite micro-alloyed hotrolled deformed bar and production method thereof
  • Niobium-titanium composite micro-alloyed hotrolled deformed bar and production method thereof
  • Niobium-titanium composite micro-alloyed hotrolled deformed bar and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The chemical composition of molten steel is: C: 0.21%; Si: 0.41%; Mn: 1.27%; Ti: 0.015%; Nb: 0.018%; P: 0.015%;

[0024] The production process is: converter smelting, argon blowing, continuous casting, and rolling processes. In the converter smelting process, ferro-niobium and ferro-titanium alloys are used for microalloying. 0.13wt%, using barium-based deoxidation, the addition of barium-based is 1.10kg / t steel, and evenly added in alignment with the steel flow during the steel laying process. In the later stage of adding, join the ladle steel flow impact zone with the steel flow; argon blowing process: strong blowing first and then weak blowing, the total time is 12 minutes; the average temperature of the tundish is controlled at 1520°C during the continuous casting process, and the average casting speed is 2.9m / min . , the process parameters of the rolling process are: heating temperature 1150-1200°C, starting rolling temperature controlled at 1030-1100°C, finishin...

Embodiment 2

[0030] The chemical composition of molten steel is: C: 0.17%; Si: 0.52%; Mn: 1.30%; Ti: 0.030%; Nb: 0.023%; P: 0.012%;

[0031] The production process is: converter smelting, argon blowing, continuous casting, and rolling processes. In the converter smelting process, ferro-niobium and ferro-titanium alloys are used for microalloying. It is 0.12wt%, using barium-based deoxidation, the amount of barium-based deoxidation is 0.95g / t steel, and it is added evenly in alignment with the steel flow during the steel laying process. In the later stage of adding, join the steel flow impact zone of the ladle with the steel flow; argon blowing process: strong blowing first and then weak blowing, the total time is 11 minutes; the average temperature of the tundish is controlled at 1525°C during the continuous casting process, and the average casting speed is 2.75m / min . , the technical parameters of the rolling process are: heating temperature 1150-1200°C, starting rolling temperature cont...

Embodiment 3

[0036] The chemical composition of molten steel is: C: 0.23%; Si: 0.47%; Mn: 1.30%; Ti: 0.024%; Nb: 0.020%; P: 0.025%;

[0037] The production process is: converter smelting, argon blowing, continuous casting, and rolling processes, wherein, in the converter smelting process, ferro-niobium and ferro-titanium alloys are used for microalloying, and high-stretch supplementary blowing is used in the smelting process to control the end point [C] It is 0.14wt%, using barium series deoxidation, the addition amount of barium series is 1.26kg / t steel, and it is added evenly in alignment with the steel flow during the steel laying process. In the later stage of adding, join the steel flow impact zone of the ladle with the steel flow; argon blowing process: strong blowing first and then weak blowing, the total time is 14 minutes; the average temperature of the tundish is controlled at 1518°C during the continuous casting process, and the average casting speed is 3.05m / min . The technica...

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 provides a niobium-titanium composite micro-alloyed hotrolled deformed bar which comprises the following chemical components: 0.15-0.25wt% of C, 0.30-0.60wt% of Si, 1.20-1.60wt% of Mn, 0.010-0.040wt% of Ti, 0.010-0.025wt% of Nb, less than or equal to 0.030wt% of P, less than or equal to 0.030wt% of S and the balance of Fe and inevitable impurities. According to the invention, the hotrolled deformed bar is produced by utilizing a niobium-titanium composite micro-alloying process, thus the addition of microalloy can be reduced, the production cost can be effectively lowered, and the produce market competitiveness can be improved.

Description

technical field [0001] The invention relates to a steel bar and a production method, in particular to a niobium-titanium composite micro-alloyed hot-rolled ribbed steel bar and a production process thereof, belonging to the field of micro-alloyed construction steel. Background technique [0002] HRB400 hot-rolled ribbed steel bar is a relatively high-strength construction steel grade in the Chinese GB1499 standard, and is an important material in the concrete structure of engineering buildings. In industrialized countries such as Europe and the United States, the consumption of HRB400 grade and above strength steel bars has accounted for more than 70% of the construction steel consumption. my country's building concrete reinforcement has always been dominated by HRB335. Due to the low strength of HRB335 steel bars, in order to ensure the strength of the building structure, the arrangement density of steel bars has to be increased, which increases the amount of steel used an...

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): C22C38/14C22C33/04C21D8/08
Inventor 刘艳林杜传治
Owner LAIWU IRON & STEEL GRP
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