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Composite reinforced producing method for high strength steel

A production method and technology for high-strength steel, applied in the field of smelting, can solve the problems of lack of refined grains in the production of high-strength steel, poor ductility of cold-worked steel bars, and poor anti-strain aging performance, so as to optimize the continuous casting cooling process and refine the grains. , The effect of reducing construction costs

Inactive Publication Date: 2007-01-24
SHOUGANG SHUICHENG IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to pearlite, the C-dominated high-strength steel series (including hot-rolled and cold-rolled) has a serious strength and ductility imbalance due to the development of strength, mainly manifested in low toughness index and poor strain aging resistance. , followed by the technical performance of the construction site: poor performance in welding, cold bending, straightening, etc.
The third is the poor ductility of cold-worked steel bars
[0005] Second, the grain size is uneven
High-strength steel production lacks grain refinement measures

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1: Production of composite reinforced high-strength steel required for φ28 and φ25 steel bars

[0028] (1) Hot metal 917kg / t, scrap steel 52kg / t, pig iron 107kg / t;

[0029] (2) Smelting:

[0030] Oxygen converter is used for smelting, and the carbon content at the end point is controlled at 0.08-0.12%;

[0031] The chemical composition of the product is controlled according to the requirements of Table 1;

[0032] chemical composition(%)

[0033] After the smelting is completed, the slag is blocked and the steel is tapped;

[0034] (3) Deoxidation alloying:

[0035] SiMnFe→MnFe→SiFe→SiAlCaBa→NbFe;

[0036] (4) Blowing argon:

[0037] The bottom of the ladle is blown with argon, and the argon blowing time is not less than 4 minutes, and weak stirring is used when blowing argon.

[0038] (5) Continuous casting:

[0039] The tundish adopts AlC quality nozzle to protect the pouring. Low liquid level pouring is strictly prohibited, and the liquid le...

Embodiment 2

[0047] Example 2: Production of composite reinforced high-strength steel required for φ22 and φ20 steel bars

[0048] (1) Hot metal 917kg / t, scrap steel 52kg / t, pig iron 107kg / t;

[0049] (2) Smelting:

[0050] Oxygen converter is used for smelting, and the carbon content at the end point is controlled at 0.08-0.12%;

[0051] The chemical composition of the product is controlled according to the requirements of Table 1;

[0052] chemical composition(%)

[0053] After the smelting is completed, the slag is blocked and the steel is tapped;

[0054] (3) Deoxidation alloying:

[0055] SiMnFe→MnFe→SiFe→SiAlCaBa→NbFe;

[0056] (4) Blowing argon:

[0057] The bottom of the ladle is blown with argon, and the argon blowing time is not less than 4 minutes, and weak stirring is used when blowing argon.

[0058] (5) Continuous casting:

[0059] The tundish adopts AlC quality nozzle to protect the pouring. Low liquid level pouring is strictly prohibited, and the liquid le...

Embodiment 3

[0067] Example 3: Production of composite reinforced high-strength steel required for φ18 and φ16 steel bars

[0068] (1) Hot metal 917kg / t, scrap steel 52kg / t, pig iron 107kg / t;

[0069] (2) Smelting:

[0070] Oxygen converter is used for smelting, and the carbon content at the end point is controlled at 0.08-0.12%;

[0071] The chemical composition of the product is controlled according to the requirements of Table 1;

[0072] chemical composition(%)

[0073] After the smelting is completed, the slag is blocked and the steel is tapped;

[0074] (3) Deoxidation alloying:

[0075] SiMnFe→MnFe→SiFe→SiAlCaBa→NbFe;

[0076] (4) Blowing argon:

[0077] The bottom of the ladle is blown with argon, and the argon blowing time is not less than 4 minutes, and weak stirring is used when blowing argon.

[0078] (5) Continuous casting:

[0079] The tundish adopts AlC quality nozzle to protect the pouring. Low liquid level pouring is strictly prohibited, and the liquid le...

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PUM

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Abstract

The production process of compositely reinforced steel includes the steps of smelting, tapping, deoxygenating and alloying, blowing argon, continuous casting, finishing, heating, rolling, cooling, etc. The production process features smelting in oxygen converter with final carbon content controlled in 0.08-0.12 %, controlling the chemical components of the steel product, deoxygenating and alloying via adding SiMnFe, MnFe, SiFe, SiAlCaBa and NbFe, bottom blowing argon in the ladle, continuous casting at 1020-1060 deg.c, and rolling in the austenite re-crystallization region. The steel bar product of the present invention has high toughness, good weldability, good earthquake resistant performance, high strength, low cost and high comprehensive performance.

Description

technical field [0001] The invention belongs to the technical field of smelting, and in particular relates to a composite strengthening production method of high-strength steel. Background technique [0002] The high-strength steel series is established by strengthening and grading of C, Mn and Si. Due to pearlite, the C-dominated strengthening mechanism series of high-strength steels (including hot-rolled and cold-rolled) have serious imbalance of strength and ductility due to the development of strength, mainly manifested as low toughness index and poor resistance to strain aging. , followed by the process performance of the construction site: poor welding, cold bending, straightening and other performance. The third is the poor ductility of cold-worked steel bars. The above-mentioned quality problems are manifested in the mismatch between strength and ductility in various high-strength steels, strong notch sensitivity, poor strain aging resistance, large work hardening ...

Claims

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Application Information

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IPC IPC(8): C21C5/30C21C7/072B22D11/18B21B37/74
Inventor 杨茂麟刘永林夏朝开王丽鹃魏福龙孙诚张芳李燚罗源郭武卫周雄
Owner SHOUGANG SHUICHENG IRON & STEEL GRP
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