A method for preparing high nitrogen steel with micro-carbon ferrochrome

A technology of micro-carbon ferrochrome and micro-carbon ferrochrome powder, which is applied in the fields of smelting high-strength stainless steel and high-nitrogen stainless steel, can solve the problems of high price, difficulty in adding nitrogen, and small output, and achieve reduced manufacturing costs, reliable quality, Material controllable effect

Active Publication Date: 2016-08-24
上海相济新材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High-nitrogen steel is mainly composed of iron (Fe), chromium (Cr), manganese (Mn), nitrogen (N) and other chemical elements. The difficulty in smelting high-nitrogen steel is that nitrogen is difficult to add and easily escapes from the melt to form Nitrogen, some documents have proposed the method that can smelt high-nitrogen steel under normal pressure or near normal pressure, make such as CN103451508A have proposed that high-nitrogen alloy melt flow limit is mixed into Fe-Cr-Mn melt, and CN103436768A has proposed Fe-Cr-Mn melt -Cr-Mn melt is slowly blended into high nitrogen alloy melt, CN103451509A proposes to add basic steel materials etc. to high nitrogen alloy melt, and the main raw materials for adding Cr and N are ferrochromium nitride and a small amount of high nitrogen chromium Iron, the output of this raw material is small, the price is high, and it is difficult to ensure a stable chemical composition requirement, which is not suitable for the high-quality mass production of high-nitrogen steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Prepare 1000kg of high-nitrogen steel, the main component content (wt%) is Cr19-21, Mn18-20, N0.8-9.5, Mo1.5-2.0, C≤0.03, Si≤1.5, S≤0.05, P≤0.05.

[0034] The selected raw materials are:

[0035]1) Micro-carbon ferrochromium powder: The detected component content (wt%) is: chromium 65, carbon 0.15, silicon 1.0, phosphorus 0.03, sulfur 0.025, and the rest is iron. The particle size distribution of the powder is: 150-250 mesh, accounting for 90% , ≥250 mesh accounted for 5%, ≤150 mesh accounted for 5%;

[0036] 2) Carbonate powder: It is composed of calcium carbonate and magnesium carbonate, and its content (wt%) is 80 and 20 respectively. The particle size of the powder is 250-300 mesh, accounting for 95%, and the rest is 5%;

[0037] 3) Oxide powder: It is composed of chromium oxide, iron oxide and manganese oxide. %;

[0038] 4) The selected binder is liquid sodium silicate;

[0039] 5) Industrial pure iron (carbon content (wt%) ≤ 0.05); metal manganese is vacuum s...

Embodiment 2

[0045] Prepare 1000kg high nitrogen steel, its main component content is the same as embodiment 1.

[0046] Selected raw materials: The detected composition content (wt%) of the selected micro-carbon ferrochromium powder is: chromium 52, carbon 0.03, silicon 2.0, phosphorus 0.04, sulfur 0.03, and the rest is iron. The particle size distribution of the powder is: 150-250 mesh 90%, ≥250 mesh accounts for 5%, and ≤150 mesh accounts for 5%; the carbonate powder is calcium carbonate, and the particle size of the powder is the same as in Example 1; the oxide powder is chromium trioxide, and the particle size of the powder is the same as in Example 1 1; metal manganese is electrolytic manganese metal sheet; other raw materials are the same as embodiment 1.

[0047] step:

[0048] 1) Preparation of micro-carbon ferrochrome block and high-nitrogen ferrochrome intermediate: add 85kg of calcium carbonate powder and 1.0kg of chromium trioxide powder to 350kg of micro-carbon ferrochrome p...

Embodiment 3

[0052] Except that the oxide powder mixed with micro-carbon ferrochromium is 9kg iron oxide, other raw materials, additions, process steps, etc. are all the same as in Example 1, and the chemical composition of the high nitrogen steel obtained by testing is similar, and the content of each element (wt% ) is: chromium 19.24, manganese 18.15, nitrogen 0.91, carbon 0.013, molybdenum 1.89, Si 0.38, S≤0.02, P≤0.02, other elements 0.3, and the balance is iron; the total weight of the obtained high nitrogen steel is 1003.5kg.

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Abstract

The invention provides a method for preparing high-nitrogen steel from micro-carbon ferrochrome. First, micro-carbon ferrochrome powder is subjected to nitrogen addition, high-nitrogen ferrochrome intermediates are prepared, and then the high-nitrogen ferrochrome intermediates are employed to prepare high-nitrogen steel. In the method, micro-carbon ferrochrome powder is employed to prepare high-nitrogen ferrochrome intermediates self, the quality is good, the material quality is controllable, which is helpful for smooth and steady smelting of high-nitrogen alloy and high-nitrogen steel melt, chemical components of high-nitrogen steel can be controlled effectively, and high-quality high-nitrogen steel bases and castings can be obtained. Micro-carbon ferrochrome powder is employed as a main raw material for preparing high-nitrogen steel, the source is wide, the quality is reliable, the preparation cost of high-nitrogen steel bases and castings can be lowered when the method is compared with a method employing nitride ferrochrome and high-nitrogen ferrochrome raw materials directly.

Description

technical field [0001] The invention relates to a method for smelting high-strength stainless steel, which belongs to the field of iron and steel smelting. Background technique [0002] High-nitrogen austenitic stainless steel (hereinafter referred to as high-nitrogen steel) has gradually expanded its application range and has been applied in wider and more complex conditions due to its excellent properties such as nickel saving, corrosion resistance, high strength, and high plasticity. High-nitrogen steel is mainly composed of iron (Fe), chromium (Cr), manganese (Mn), nitrogen (N) and other chemical elements. The difficulty in smelting high-nitrogen steel is that nitrogen is difficult to add and easily escapes from the melt to form Nitrogen, some documents have proposed the method that can smelt high-nitrogen steel under normal pressure or near normal pressure, make such as CN103451508A have proposed that high-nitrogen alloy melt flow limit is mixed into Fe-Cr-Mn melt, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/38C22C33/06
Inventor 王淮孙岩铎
Owner 上海相济新材料科技有限公司
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