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A kind of high nitrogen duplex stainless steel and preparation method thereof

A technology of duplex stainless steel and stainless steel, applied in the field of alloy smelting, can solve the problems of slow development of nitrogen alloying technology of duplex stainless steel, poor fluidity of duplex stainless steel, solidification cracks, etc. Strong operability and the effect of increasing nitrogen content

Active Publication Date: 2021-04-20
宁波万冠熔模铸造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The solidification temperature range of duplex stainless steel in the two-phase interval is much higher than that of austenitic stainless steel. There is a problem of micro-shrinkage between solidified dendrites, which is prone to solidification cracks, and the fluidity of duplex stainless steel liquid is insufficient. Good, making the development of nitrogen alloying technology of duplex stainless steel slower

Method used

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  • A kind of high nitrogen duplex stainless steel and preparation method thereof
  • A kind of high nitrogen duplex stainless steel and preparation method thereof
  • A kind of high nitrogen duplex stainless steel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] S1: The composition of stainless steel, by mass percentage, is C: 0.03%, Si: 0.47%, Cr: 26.48%, Mn: 1.1%, Ni: 7.2%, Mo: 3.61%, N: 0.45%, Cu: 0.88%, Nb: 0.030%, Fe: balance, and weigh raw materials according to this ratio: pure iron, electrolytic manganese, ferrosilicon, ferromolybdenum, ferroniobium, metallic chromium, ferrochrome, high-nitrogen ferrochrome, copper, nickel Plate, mix all raw materials except ferrochrome and high-nitrogen ferrochrome into the melting furnace to form molten steel, then preheat the ingot mold to 150°C and keep it warm for 3 hours, then put it into the pouring chamber;

[0046] S2: Vacuumize the smelting furnace to a vacuum degree of 10 Pa, and then add ferrochrome and high-nitrogen ferrochrome after the molten steel is melted, wherein the addition of high-nitrogen ferrochrome accounts for 7.5% of the total amount of the alloy;

[0047] S3: Control the furnace temperature at 1480°C, open the control valve of the nitrogen gas cylinder, fill ...

Embodiment 2

[0049] S1: The composition of stainless steel, by mass percentage, is C: 0.038%, Si: 0.66%, Cr: 27.09%, Mn: 1.21%, Ni: 7.52%, Mo: 3.81%, N: 0.55%, Cu: 1.18%, Nb: 0.0321%, Fe: balance, and weigh raw materials according to this ratio: pure iron, electrolytic manganese, ferrosilicon, ferromolybdenum, ferroniobium, metallic chromium, ferrochrome, high-nitrogen ferrochrome, copper, nickel Plate, mix all raw materials except ferrochrome and high-nitrogen ferrochrome into the melting furnace to form molten steel, then preheat the ingot mold to 150°C and keep it warm for 3 hours, then put it into the pouring chamber;

[0050]S2: Vacuumize the smelting furnace to a vacuum degree of 10 Pa, and then add ferrochrome and high-nitrogen ferrochrome after the molten steel is melted, wherein the amount of high-nitrogen ferrochrome accounts for 8.75% of the total amount of the alloy;

[0051] S3: Control the furnace temperature at 1480°C, open the nitrogen cylinder control valve, fill the melti...

Embodiment 3

[0053] S1: The composition of stainless steel, by mass percentage, is C: 0.045%, Si: 0.747%, Cr: 28%, Mn: 1.5%, Ni: 7.92%, Mo: 4.0%, N: 0.65%, Cu: 1.38%, Nb: 0.0345%, Fe: balance, and weigh raw materials according to this ratio: pure iron, electrolytic manganese, ferrosilicon, ferromolybdenum, ferroniobium, metallic chromium, ferrochrome, high-nitrogen ferrochrome, copper, nickel Plate, mix all raw materials except ferrochrome and high-nitrogen ferrochrome into the melting furnace to form molten steel, then preheat the ingot mold to 150°C and keep it warm for 3 hours, then put it into the pouring chamber;

[0054] S2: Vacuumize the smelting furnace to a vacuum degree of 10 Pa, and then add ferrochrome and high-nitrogen ferrochrome after the molten steel is melted, wherein the amount of high-nitrogen ferrochrome accounts for 10% of the total amount of the alloy;

[0055] S3: Control the furnace temperature at 1480°C, open the nitrogen cylinder control valve, fill the melting fu...

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Abstract

The invention relates to a high-nitrogen duplex stainless steel and a preparation method thereof, belonging to the technical field of alloy smelting. The stainless steel is composed of the following components in mass percentage: C: 0.03-0.045%, Si: 0.45-0.75%, Cr: 26-28 %, Mn: ≤1.5%, Ni: 7‑8%, Mo: 3.5‑4.0%, N: 0.45‑0.65%, Cu: 0.8‑1.5%, Nb: 0.030‑0.035%, Fe: balance, and use Alloy smelting is carried out by forming a nitrogen atmosphere, and finally stainless steel with high nitrogen content and excellent comprehensive performance is obtained.

Description

technical field [0001] The invention relates to a high-nitrogen duplex stainless steel and a preparation method thereof, belonging to the technical field of alloy smelting. Background technique [0002] Duplex stainless steel has ferrite and austenite duplex structure in solid solution state, so it has the characteristics of both ferritic stainless steel and austenitic stainless steel. Compared with ferritic and martensitic stainless steel, it has high toughness, low brittle transition temperature, significantly improved intergranular corrosion resistance and weldability. At the same time, ferritic stainless steel retains the characteristics of high thermal conductivity, small expansion coefficient, and superplasticity; compared with austenitic stainless steel, duplex stainless steel has high strength, almost double the yield strength, and is resistant to intergranular corrosion and stress corrosion The properties such as corrosion fatigue and corrosion fatigue have been si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/44C22C38/04C22C38/42C22C38/48C22C33/06
CPCC21D2211/001C21D2211/005C22C33/06C22C38/001C22C38/02C22C38/04C22C38/42C22C38/44C22C38/48
Inventor 应寒冰励康任波维
Owner 宁波万冠熔模铸造有限公司