Steel for 3.5 Ni and production method thereof

A production method and technology for molten steel, which are applied in the directions of coating, process efficiency improvement, and devices for coating liquid on surfaces, etc., can solve the problems of waste and high cost, and achieve the improvement of cleanliness, reduction of manufacturing cost, and reduction of production volume. Effect

Pending Publication Date: 2022-07-12
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, 3.5Ni steel is used for containers with a nickel content of 3.5%. Steel, how to reduce the manufacturing cost of 3.5Ni steel is a key step for enterprises to obtain a good market competitive advantage

Method used

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  • Steel for 3.5 Ni and production method thereof
  • Steel for 3.5 Ni and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The chemical composition and mass percentage of a 3.5Ni steel provided in this embodiment are as follows: C: 0.041%, Si: 0.17%, Mn: 0.73%, P: 0.003%, S: 0.0011%, Nb: 0.0020% ( residual), V: 0.001% (residual), Ti: 0.003% (residual), Ni: 3.560%, Cr: 0.11%, Mo: 0.13%, Cu: 0.020%, Al: 0.036%, Mg: 0.0013%, N : 0.0037%, H: 0.00010%, and the balance is Fe and inevitable impurities.

[0028] The preparation method includes the following steps:

[0029] 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 slag is poured with 80% oxygen supply, and the smelting end temperature is 1609 °C.

[0030] S2. The molten steel is sent to refining for deoxidation, alloying and desulfurization operations. After the composition temperature is met, it is sent to RH for vacuum treatment. The vacuum degree is less than or equal to 3.0 mbar, and the vacuum holding time is 17 minutes.

[0031] S3. After the m...

Embodiment 2

[0037] The chemical composition and mass percentage of a 3.5Ni steel provided in this embodiment are as follows: C: 0.043%, Si: 0.19%, Mn: 0.68%, P: 0.004%, S: 0.0012%, Nb: 0.0020% ( residual), V: 0.001% (residual), Ti: 0.003% (residual), Ni: 3.49%, Cr: 0.13%, Mo: 0.19%, Cu: 0.020%, Al: 0.033%, Mg: 0.0016%, N : 0.0043%, H: 0.00017%, and the balance is Fe and inevitable impurities.

[0038] The preparation method includes the following steps:

[0039]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 slag is poured with 80% oxygen supply, and the smelting end temperature is 1622 °C.

[0040] S2. The molten steel is sent to refining for deoxidation, alloying and desulfurization operations. After the composition temperature is met, it is sent to RH for vacuum treatment. The vacuum degree is less than or equal to 3.0 mbar, and the vacuum holding time is 20 minutes.

[0041] S3. After the mol...

Embodiment 3

[0047] A 3.5Ni steel provided in this embodiment has the following chemical composition and mass percentage: C: 0.073%, Si: 0.22%, Mn: 0.79%, P: 0.004%, S: 0.0013%, Nb: 0.0030% (residual ), V: 0.001% (residual), Ti: 0.003% (residual), Ni: 3.66%, Cr: 0.14%, Mo: 0.19%, Cu: 0.030%, Al: 0.027%, Mg: 0.0017%, N: 0.0055%, H: 0.00019%, the balance is Fe and inevitable impurities.

[0048] The preparation method includes the following steps:

[0049] S1. After the molten iron is desulfurized, it is sent to the converter for smelting, and the top-bottom re-blowing process is adopted for smelting. The slag is poured with 80% oxygen supply, and the smelting end temperature is 1626 ℃.

[0050] S2. The molten steel is sent to refining for deoxidation, alloying and desulfurization operations. After the composition temperature is met, it is sent to RH for vacuum treatment. The vacuum degree is less than or equal to 3.0 mbar, and the vacuum holding time is 25 minutes.

[0051] S3. After the ...

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Abstract

The invention discloses steel for 3.5 Ni and a production method thereof, and relates to the technical field of steel production, and the steel comprises the following chemical components in percentage by mass: 0.030%-0.080% of C, 0.10%-0.30% of Si, 0.50%-0.90% 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, 3.30%-3.70% of Ni, 0.05%-0.20% of Cr, 0.05%-0.20% of Mo, less than or equal to 0.050% 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 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 3.5Ni 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, the company continues to develop various types of steel. The nickel-based steel has high alloy content and excellent product quality. However, there are currently high costs and waste in low-end market applications. Among them, 3.5Ni steel is used for containers with a nickel content of 3.5%. How to reduce the manufacturing cost of 3.5Ni steel is a key step for enterprises to gain a good market competitive advantage. SUMMARY OF THE INVENTION [0003] Aiming at the above technical problems, the present invention overcomes the shortcomings of the prior art and provi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50B05D7/14B05D7/24B22D11/115C21D8/02C22C33/04B22D11/12
CPCC22C38/02C22C38/04C22C38/44C22C38/46C22C38/48C22C38/50C22C38/42C22C38/002C22C38/001C22C33/04C21D8/0205C21D8/0226C21D8/0263B22D11/115B22D11/1206B05D7/14B05D7/24Y02P10/20
Inventor 翟冬雨刘心阳杨柳
Owner NANJING IRON & STEEL CO LTD
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