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Niobium microalloyed fine grain HRB400 rebar and preparation method thereof

A micro-alloying and fine-grain technology, applied in the field of metallurgy, can solve the problems of unstable performance and poor mechanical strength, and achieve the effect of excellent and stable mechanical properties and low cost.

Inactive Publication Date: 2019-07-19
BAOTOU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing HRB400 steel bars have poor mechanical strength and unstable performance. In order to improve the strength of steel bars and reduce production costs, niobium microalloying is used to produce HRB400 steel bars with controlled cooling after rolling.

Method used

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  • Niobium microalloyed fine grain HRB400 rebar and preparation method thereof
  • Niobium microalloyed fine grain HRB400 rebar and preparation method thereof
  • Niobium microalloyed fine grain HRB400 rebar and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0020] 10 furnaces of steel have been produced in industrial trials, and the specific process parameters are controlled as follows:

[0021] 1. Converter smelting

[0022] During converter smelting, 5000-6000kg of lime, 3000-4000kg of dolomite, 1000-3000kg of iron balls are added according to the composition requirements, and 500kg of ferrosilicon and 2800kg of silicon-manganese are added during tapping.

[0023] The carbon content, phosphorus content (mass percentage) and tapping temperature of the molten steel at the end of the converter are shown in Table 1.

[0024] Table 1 Composition and temperature of converter tapping

[0025] Tapping temperature, ℃ Tapping carbon content, wt% Phosphorus content in tapping, wt% Example 1 1620 0.06 0.011 Example 2 1644 0.15 0.030 Example 3 1633 0.11 0.020 Example 4 1625 0.07 0.015 Example 5 1640 0.13 0.022 Example 6 1628 0.09 0.019 Example 7 1642 0.14 0.025 Exa...

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PUM

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Abstract

The invention discloses a niobium microalloyed fine grain HRB400 rebar. The niobium microalloyed fine grain HRB400 rebar is prepared from, by mass, 0.22% to 0.25% of C, 0.40% to 0.50% of Si, 1.35% to1.45% of Mn, 0.025% to 0.035% of Nb and the balance Fe and inevitable impurities. The invention further discloses a preparation method of the niobium microalloyed fine grain HRB400 rebar. According tothe niobium microalloyed fine grain HRB400 rebar, the strength of the rebar is improved, and the production cost is reduced.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a niobium microalloyed fine-grained HRB400 steel bar and a preparation method thereof. Background technique [0002] HRB400 is the grade of threaded steel bar stipulated in "Steel for Reinforced Concrete" GB 1499.2-2018. Due to the wide range of standard components and the differences in production equipment and process control of manufacturers, the composition of HRB400 hot-rolled ribbed steel bars produced by various manufacturers Each is different, and the production process of each steel factory is also different. The existing HRB400 steel bar has poor mechanical strength and unstable performance. In order to improve the strength of the steel bar and reduce the production cost, the HRB400 steel bar is produced by niobium microalloying combined with controlled cooling after rolling. Contents of the invention [0003] In order to solve the above technical problems, the ob...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/12C22C38/04C22C38/02C21D8/08
CPCC21D8/08C22C38/02C22C38/04C22C38/12
Inventor 吕刚涛雅赵晓敏姜德刚白月琴
Owner BAOTOU IRON & STEEL GRP
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