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HRB400 steel bar and production method of HRB400 steel bar

A production method and technology of steel bars, which are applied in the production field of HRB400 steel bars and HRB400 steel bars, can solve the problems of unstable performance, high cost and poor mechanical strength, etc.

Inactive Publication Date: 2018-12-07
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 bar has poor mechanical strength and unstable performance. In order to increase the strength of the steel bar, the existing technology also adopts rapid cooling and fine-grain strengthening to improve the strength of the steel bar, or there are methods to improve the strength of the steel bar through microalloying. But the cost is higher

Method used

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  • HRB400 steel bar and production method of HRB400 steel bar
  • HRB400 steel bar and production method of HRB400 steel bar
  • HRB400 steel bar and production method of HRB400 steel bar

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach

[0030] 10 furnaces of steel have been produced in industrial trials, and the specific process parameters are controlled as follows:

[0031] 1. Converter smelting

[0032] 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.

[0033] 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.

[0034] Table 1 Composition and temperature of converter tapping

[0035]

[0036]

[0037] 2. LF furnace refining

[0038] According to the molten steel composition and temperature changes, add auxiliary materials to make slag, add alloys to perform fine-tuning and temperature-raising operations. Add 500-600kg of lime, 200-300kg of bauxite, and fine-tune the alloy according to the refining composition. Add 50...

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PUM

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Abstract

The invention provides an HRB400 steel bar and a production method of the HRB400 steel bar. The HRB400 steel bar comprises, by mass, 0.19-0.25% of C, 0.55-0.80% of Si, 1.45-1.60% of Mn, 0.02-0.04% ofV, 0.008-0.010% of N, and the balance Fe and unavoidable impurities. According to the technical scheme, vanadium nitrogen microalloying is used for improving the strength, compared with ferrovanadiummicroalloying, the aim of reducing the cost is achieved, and the HRB400 steel bar has the advantages that mechanical properties are excellent and stable, and the cost is low.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a HRB400 steel bar and a production method of the HRB400 steel bar. Background technique [0002] HRB400 is the grade of threaded steel bar stipulated in "Steel for Reinforced Concrete" GB 1499.2-2007. 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 increase the strength of the steel bar, the existing technology also adopts rapid cooling and fine-grain strengthening to improve the strength of the steel bar, or there are methods to improve the strength of the steel bar through microalloying. But the cost is higher. Contents of th...

Claims

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Application Information

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IPC IPC(8): C21C7/00C21C7/06C22C33/04C22C38/02C22C38/04C22C38/12B21B1/16
CPCB21B1/16C21C7/0006C21C7/06C22C33/04C22C38/001C22C38/002C22C38/02C22C38/04C22C38/12
Inventor 吕刚涛雅戈春刚赵晓敏姜德刚白月琴
Owner BAOTOU IRON & STEEL GRP
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