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Steel for 7Ni and production method thereof

A production method and molten steel technology, applied in the field of iron and steel production, can solve problems such as high cost and waste, and achieve the effects of reducing manufacturing costs, improving cleanliness, and avoiding secondary oxidation

Pending Publication Date: 2022-07-01
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to improve competitiveness, enterprises continue to develop varieties of steel. Nickel-based steel has high alloy content and excellent product quality. However, there are currently high costs and wasteful applications in low-end markets. Among them, 7Ni steel is steel for containers with a nickel content of 7%. , how to reduce the manufacturing cost of 7Ni steel is a key step for enterprises to obtain a good market competitive advantage

Method used

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  • Steel for 7Ni and production method thereof
  • Steel for 7Ni and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The chemical composition and mass percentage of a 7Ni steel provided in this embodiment are as follows: C: 0.043%, Si: 0.16%, Mn: 0.79%, P: 0.003%, S: 0.0011%, Nb: 0.0030% (residual ), V: 0.002% (residual), Ti: 0.002% (residual), Ni: 7.1%, Cr: 0.02%, Mo: 0.23%, Cu: 0.030%, Al: 0.029%, Mg: 0.0017%, N: 0.0036%, H: 0.00017%, the balance is Fe and inevitable impurities.

[0029] The preparation method includes the following steps:

[0030] S1. The molten iron is desulfurized and sent to the converter for smelting, and the top-bottom re-blowing process is used for smelting. The nickel-molybdenum alloy is added to the converter together with the scrap, and is included in the weight of the scrap. The oxygen is supplied to 80% for slag dumping. The smelting end temperature is 1602 ° C, and the composition meets the requirements carry out the tapping operation;

[0031] S2. The molten steel is sent to refining for deoxidation, alloying and desulfurization operations. After the...

Embodiment 2

[0038]The chemical composition and mass percentage of a 7Ni steel provided in this embodiment are as follows: C: 0.0430%, Si: 0.09%, Mn: 0.779%, P: 0.002%, S: 0.0012%, Nb: 0.0020% (residual ), V: 0.002% (residual), Ti: 0.003% (residual), Ni: 6.96%, Cr: 0.02%, Mo: 0.21%, Cu: 0.010%, Al: 0.038%, Mg: 0.0014%, N: 0.0046%, H: 0.00017%, the balance is Fe and inevitable impurities.

[0039] The preparation method includes the following steps:

[0040] S1. The molten iron is desulfurized and sent to the converter for smelting. The top-bottom re-blowing process is used for smelting. The nickel-molybdenum alloy is added to the converter together with the scrap, and is included in the weight of the scrap. The oxygen is supplied to 80% for slag dumping. The smelting end temperature is 1586 ° C, and the composition meets the requirements carry out the tapping operation;

[0041] S2. The molten steel is sent to refining for deoxidation, alloying and desulfurization operations. After the c...

Embodiment 3

[0048] The chemical composition and mass percentage of a 7Ni steel provided in this embodiment are as follows: C: 0.056%, Si: 0.260%, Mn: 0.93%, P: 0.002%, S: 0.0013%, Nb: 0.003% (residual ), V: 0.002% (residual), Ti: 0.002% (residual), Ni: 7.3%, Cr:: 0.02%, Mo: 0.29%, Cu: 0.020%, Al: 0.041%, Mg: 0.0016%, N : 0.0036%, H: 0.00011%, and the balance is Fe and inevitable impurities.

[0049] The preparation method includes the following steps:

[0050] S1. The molten iron is desulfurized and sent to the converter for smelting. The top-bottom re-blowing process is used for smelting. The nickel-molybdenum alloy is added to the converter together with the scrap, and is included in the weight of the scrap. The oxygen is supplied to 80% for slag dumping. The smelting end temperature is 1606 ° C, and the composition meets the requirements carry out the tapping operation;

[0051] S2. The molten steel is sent to refining for deoxidation, alloying and desulfurization operations. After t...

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PUM

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Abstract

The invention discloses steel for 7Ni and a production method thereof, and relates to the technical field of steel production, the steel comprises the following chemical components by mass percent: 0.030%-0.060% of C, 0.05%-0.30% of Si, 0.70%-1.0% of Mn, less than or equal to 0.005% of P, less than or equal to 0.002% of S, less than or equal to 0.0050% of residual Nb, less than or equal to 0.003% of residual V, less than or equal to 0.005% of residual Ti, 6.50%-7.50% of Ni, less than or equal to 0.05% of Cr, 0.20%-0.30% of Mo, less than or equal to 0.05% of Cu, 0.020%-0.050% of Al, 0.0008%-0.0020% of Mg, less than or equal to 0.0060% of N, less than or equal to 0.0002% Through a series of process improvements of smelting, rolling, heat treatment and the like, the process problem of intergranular cracks of the steel grade is solved, the advantage of batch smelting and manufacturing of the steel grade is obtained, the manufacturing stability is greatly improved, and the manufacturing cost is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of iron and steel production, in particular to a 7Ni steel and a production method thereof. Background technique [0002] With the continuous development of my country's iron and steel metallurgy technology, the competitive advantages of iron and steel enterprises' brands are becoming more and more obvious. In order to improve competitiveness, enterprises continue to develop various types of steel. Nickel-based steels have high alloy content and excellent product quality. However, there are currently high costs and waste in low-end market applications. Among them, 7Ni steel is container steel with a nickel content of 7%. , How to reduce the manufacturing cost of 7Ni steel is a key step for enterprises to obtain a good market competitive advantage. SUMMARY OF THE INVENTION [0003] In view of the above technical problems, the present invention overcomes the shortcomings of the prior art, and provides a 7Ni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C21C7/00C21C7/10C21D1/18C21D6/00C21D8/02C22C33/06
CPCC22C38/02C22C38/04C22C38/08C22C38/12C22C38/14C22C38/16C22C38/06C22C38/002C22C38/48C22C38/46C22C38/50C22C38/44C22C38/42C21C7/0006C21C7/10C21D1/18C21D6/001C21D6/004C21D6/005C21D6/008C21D8/0205C21D8/0226C21D8/0247C22C33/06Y02P10/20
Inventor 翟冬雨刘心阳杨柳陈萌
Owner NANJING IRON & STEEL CO LTD
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