Production method for ultralow-phosphorus hydroforming steel

A production method, the technology of hydrogen-prone steel, applied in the manufacture of converters, etc., can solve problems such as non-conformity in performance and failure to meet ultra-low phosphorus control requirements

Active Publication Date: 2018-04-03
NANYANG HANYE SPECIAL STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the practice shows that the method of controlling the content of phosphorus, sulfur and hydrogen in molten steel of this invention is used for the ultra-low phosphorus control

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A production method of ultra-low phosphorus hydrogen-prone steel, comprising the following steps:

[0044] Step S1: Pretreatment of molten iron. After the molten iron is desulfurized by the KR method, the temperature is 1350°C and the sulfur content is 0.010%. During this process, the initial sulfur content of the molten iron is 0.039%. The amount of calcium oxide added is 450kg;

[0045] Step S2: LD converter smelting, the loading capacity of the converter is 105 tons, of which 80 tons of molten iron and 25 tons of scrap steel are smelted. During the smelting process, the oxygen content is controlled at 1000ppm, and the blowing gun position is controlled at 1.3m in the early stage. The position of the blowing gun is controlled between 1.0m, the temperature of the pouring is 1550°C, the spot blowing time is controlled within 2 minutes, the number of spot blowing is 2 times, and the converter smelting end point, the carbon content in molten steel is 0.04%, and the phosph...

Embodiment 2

[0058] A production method of ultra-low phosphorus hydrogen-prone steel, comprising the following steps:

[0059] Step S1: Pretreatment of molten iron. After the molten iron is desulfurized by the KR method, the temperature is 1360°C and the sulfur content is 0.008%. The amount of calcium oxide added is 480kg;

[0060]Step S2: LD converter smelting, the loading capacity of the converter is 100 tons, of which, 75 tons of molten iron and 25 tons of scrap steel are smelted. During the smelting process, the oxygen content is controlled to 1040ppm, the blowing gun position is controlled at 1.3m in the early stage, and the middle and late stage The position of the blowing gun is controlled between 0.9m, the temperature of the pouring is 1550°C, the spot blowing time is controlled within 2 minutes, the number of spot blowing is 1 time, the converter smelting end point, the carbon content in the molten steel is 0.03%, and the phosphorus content is 0.010%. No deoxidizer, slagging mate...

Embodiment 3

[0073] A production method of ultra-low phosphorus hydrogen-prone steel, comprising the following steps:

[0074] Step S1: Pretreatment of molten iron. After the molten iron is desulfurized by the KR method, the temperature is 1365°C and the sulfur content is 0.006%. During this process, the initial sulfur content of the molten iron is 0.041%. Calcium oxide addition is 465kg;

[0075] Step S2: LD converter smelting, the loading capacity of the converter is 100 tons, of which 80 tons of molten iron and 20 tons of scrap steel are smelted. The smelting gun position is controlled between 1.1m, the pouring temperature is 1550°C, the point blowing time is controlled within 2 minutes, the number of point blowing is 2 times, the end point of converter smelting, the carbon content in molten steel is 0.03%, and the phosphorus content is 0.011%. No deoxidizer, slagging material and alloy are added, and argon blowing process is not carried out. After tapping, the temperature of molten st...

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PUM

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Abstract

The invention provides a production method for ultralow-phosphorus hydroforming steel and relates to the technical field of metal material smelting. The production method sequentially comprises the steps of molten iron pretreatment, LD converter smelting, primary LF refining, slagging-off treatment, secondary LF refining, VD vacuum treatment and continuous casting. Specifically, molten iron pretreatment is carried out through a KR method; in the LD converter smelting link, peroxidation is adopted to steel tapping, the final phosphorus content is strictly controlled; in the primary LF refininglink, a slagging material is added, primary refining dephosphorization is carried out, so that the phosphorus content of molten steel reaches to 0.002%-0.003%; after the phosphorus content is qualified, slagging off is carried out; in the secondary LF refining, component adjustment is mainly carried out, and the purity degree is improved; and in VD vacuum treatment, degassing is carried out, and acasting blank is obtained through continuous casting. The HIC and SSCC performance of the ultralow-phosphorus hydroforming steel obtained through the production method can meet requirements of the related standard completely, and the chemical components of a steel plate are stable; the content of harmful chemical components of phosphorus and sulfur is low; nonmetallic inclusion is controlled well; and the quality of the casting blank is good.

Description

technical field [0001] The invention relates to the technical field of metal material smelting, in particular to a production method of ultra-low phosphorus hydrogen-prone steel. Background technique [0002] Phosphorus is one of the harmful elements that need to be controlled in the steelmaking process. Phosphorus mainly affects the low-temperature impact properties of steel, and steel with high phosphorus content is prone to "cold brittleness" at low temperatures. With the continuous development of science and technology, the iron and steel industry now has higher and higher requirements for various properties of steel, especially in the aspect of hydrogen-facing container steel. In order to achieve a certain performance for this type of steel, the phosphorus in the finished product is mostly required to be below 0.008%. Under normal circumstances, there are two types of dephosphorization in the steelmaking process, one is the dephosphorization of molten iron by injection ...

Claims

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Application Information

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IPC IPC(8): C22C33/04C21C1/02C21C5/28C21C7/10C21C7/068
CPCC21C1/02C21C5/28C21C7/0087C21C7/068C21C7/10C22C33/04
Inventor 朱书成刘丹许少普赵迪郭艳芳黄红乾李红阳高照海康文举
Owner NANYANG HANYE SPECIAL STEEL CO LTD
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