High-carbon duplex stainless steel material and preparation method thereof

A duplex stainless steel, high-carbon technology, used in manufacturing tools, heat treatment equipment, casting and molding equipment, etc., can solve the problem of wear resistance, pressure resistance can not meet the requirements, hardness and tensile strength are lower than requirements, and the tendency to crack is large. and other problems, to achieve the effect of excellent comprehensive service performance, improvement of anti-wear and anti-corrosion performance, and reduction of brittle fracture tendency

Active Publication Date: 2022-04-19
河北技投机械设备有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the Cr30Mo2 material has a large tendency to crack and is difficult to cast. Controlled according to the material ratio, the finished product rate after processing is lower than 60%, and according to the heat treatment process of the Cr30Mo2 material recommended by foreign countries, the hardness and tensile strength indicators of the material are lower than the requirements. As a result, its wear resistance and pressure resistance performance in the application of slurry pumps cannot meet the requirements, and it is difficult to promote

Method used

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  • High-carbon duplex stainless steel material and preparation method thereof
  • High-carbon duplex stainless steel material and preparation method thereof

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Effect test

Embodiment 1

[0031] A high-carbon duplex stainless steel material, including the following chemical elements in mass percentage:

[0032] C: 0.8%, Si: 1.12%, Mn: 0.4%, P: 0.04%, S: 0.03%, Cr: 28.0%, Ni: 0.38%, V: 0.136%, Mo: 1.7%, Nb: 0.14%, and the balance of Fe.

[0033] The preparation method of the above-mentioned high-carbon duplex stainless steel material comprises the following steps:

[0034] a. Weigh scrap steel, ferrochrome, ferromolybdenum, ferromanganese, nickel plate, ferrovanadium and ferroniobium according to the proportion of the above chemical elements in high carbon duplex stainless steel materials; Add ferromanganese and ferromanganese into the intermediate frequency furnace in turn, heat up to 1620°C for heating and melting, after the raw materials are melted by 40%, add 3# Yupont alloy liquid purifying agent to continue heating and melting, after melting, add ferrovanadium with a block size of 25mm and ferroniobium, melted and then released from the furnace to obtain...

Embodiment 2

[0038] A high-carbon duplex stainless steel material, including the following chemical elements in mass percentage:

[0039] C: 0.914%, Si: 0.493%, Mn: 0.265%, P: 0.037%, S: 0.015%, Cr: 29.5%, Ni: 0.222%, V: 0.142%, Mo: 1.776%, Nb: 0.145%, and the balance of Fe.

[0040] The preparation method of the above-mentioned high-carbon duplex stainless steel material comprises the following steps:

[0041] a. Weigh scrap steel, ferrochrome, ferromolybdenum, ferromanganese, nickel plate, ferrovanadium and ferroniobium according to the proportion of the above chemical elements in high carbon duplex stainless steel materials; Add ferromanganese and ferromanganese into the intermediate frequency furnace in turn, heat up to 1650°C for heating and melting, after the raw materials are melted by 50%, add 3# Yupont alloy liquid purifying agent to continue heating and melting, after melting, add ferrovanadium with a block size of 25mm and ferroniobium, melted and then released from the furnace ...

Embodiment 3

[0045] A high-carbon duplex stainless steel material, including the following chemical elements in mass percentage:

[0046] C: 1.1%, Si: 0.581%, Mn: 0.227%, P: 0.32%, S: 0.022%, Cr: 32.0%, Ni: 0.17%, V: 0.145%, Mo: 2.2%, Nb: 0.15%, and the balance of Fe.

[0047] The preparation method of the above-mentioned high-carbon duplex stainless steel material comprises the following steps:

[0048] a. Weigh scrap steel, ferrochrome, ferromolybdenum, ferromanganese, nickel plate, ferrovanadium and ferroniobium according to the proportion of the above chemical elements in high carbon duplex stainless steel materials; Add ferromanganese and ferromanganese into the intermediate frequency furnace in turn, heat up to 1680°C for heating and melting, after the raw materials are melted by 60%, add 3# Yupont alloy liquid purifying agent to continue heating and melting, after melting, add ferrovanadium with a block size of 25mm and ferroniobium, melted and then released from the furnace to ob...

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Abstract

The invention relates to the technical field of alloy materials, and particularly discloses a high-carbon duplex stainless steel material and a preparation method thereof. The high-carbon duplex stainless steel material comprises the following chemical elements in percentage by mass: 0.8%-1.1% of C, less than or equal to 1.5% of Si, less than or equal to 0.8% of Mn, less than or equal to 0.04% of P, less than or equal to 0.04% of S, 28.0%-32.0% of Cr, less than or equal to 0.4% of Ni, less than or equal to 0.2% of V, 1.7%-2.2% of Mo, 0.14%-0.15% of Nb and the balance of Fe. The preparation method of the high-carbon duplex stainless steel material sequentially comprises the steps of heating melting, pouring and heat treatment. The high-carbon duplex stainless steel material has high hardness and high tensile strength after being subjected to heat treatment, the slurry pump flow passage component produced by the high-carbon duplex stainless steel material is high in yield, low in nickel content requirement and good in corrosion resistance, and the corrosion resistance requirement of equipment used in the wet-process phosphoric acid industry field and the phosphorus compound fertilizer production field can be completely met.

Description

technical field [0001] The invention relates to the technical field of alloy materials, in particular to a high-carbon duplex stainless steel material and a preparation method thereof. Background technique [0002] In the field of wet-process phosphoric acid industry and the field of phosphate compound fertilizer production, the solid content of the conveyed material is mostly above 35%, the pH is low, and it is extremely corrosive. Although high-chromium-nickel-molybdenum alloys have high wear resistance and corrosion resistance, my country is a nickel-poor country. Using high-chromium-nickel-molybdenum alloys for transportation equipment in fertilizer production has high material costs and cannot be widely used. [0003] The metallographic structure of Cr30Mo2 material is ferrite + a small amount of austenite + carbide. It is a casting alloy with high chromium and high hardness. It has good wear resistance and corrosion resistance. The preferred material for corrosion is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/46C22C38/44C22C38/48C22C33/06C21D6/00B22C9/02B22C9/22C21D9/00
CPCC22C38/02C22C38/04C22C38/46C22C38/44C22C38/48C22C33/06C21D6/004C21D6/005C21D6/008B22C9/02B22C9/22C21D9/0068C21D2211/005Y02P10/20
Inventor 高建东郭鑫郝超超
Owner 河北技投机械设备有限公司
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