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High-alumina 316L stainless steel and preparation method thereof

A technology of stainless steel and stainless steel plate, applied in the field of preparation of 316L stainless steel, can solve the problems of inhibiting the long-term use of stainless steel, deteriorating stability, etc., achieving good corrosion resistance and comprehensive mechanical properties, improving corrosion resistance, and easy passivation. Effect

Inactive Publication Date: 2013-08-28
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The corrosion resistance of the commonly used 316L stainless steel mainly depends on the surface formed with Cr 2 o 3 dominated passivation film, but Cr 2 o 3 The oxide film will form volatile chromium hydroxide in a humid working environment above 600°C, which deteriorates the stability and thus inhibits the long-term use of stainless steel in many high-temperature and harsh environments

Method used

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  • High-alumina 316L stainless steel and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Prepare materials and smelt according to the actual production of 316L castings. Furnace material is 316L stainless steel plate and industrial aluminum ingot, melted by medium frequency induction furnace, furan resin sand casting, molding sand ratio is quartz sand weight: resin weight: curing agent (p-toluenesulfonic acid) weight = 100: 1: 0.4, test block It is a standard Y-shaped test block. In order to enhance the compactness of the structure, a 20mm thick cold iron is embedded in the bottom of the sand mold.

[0017] According to the formula (mass percentage), Al: 1.5%, Cr: 16.745%, Ni: 13.79%, Mo: 1.97%, Mn: 1.97%, Si: 0.985%, C: 0.0295%, and the balance is Fe , Weigh the corresponding components, and calculate the burning loss of Al as 30%, a total of 15kg. The weighed alloys are loaded into the furnace in a certain order, and the heating system is heated up. Keep the temperature at about 700°C for 30 minutes, continue to heat to 1540°C, hold the temperature for ...

Embodiment 2

[0019] Prepare materials and smelt according to the actual production of 316L castings. Furnace material is 316L stainless steel plate and industrial aluminum ingot, melted by medium frequency induction furnace, furan resin sand casting, molding sand ratio is quartz sand weight: resin weight: curing agent (p-toluenesulfonic acid) weight = 100: 1: 0.4, test block It is a standard Y-shaped test block. In order to enhance the compactness of the structure, a 20mm thick cold iron is embedded in the bottom of the sand mold.

[0020] According to the formula (mass percentage), Al: 2.0%, Cr: 16.66%, Ni: 13.72%, Mo: 1.96%, Mn: 1.96%, Si: 0.98%, C: 0.0294%, and the balance is Fe , Weigh the corresponding components, and calculate the burning loss of Al as 30%, a total of 15kg. The weighed alloys are loaded into the furnace in a certain order, and the heating system is heated up. Keep the temperature at about 700°C for 30 minutes, continue to heat to 1540°C, hold the temperature for 20...

Embodiment 3

[0022] Prepare materials and smelt according to the actual production of 316L castings. Furnace material is 316L stainless steel plate and industrial aluminum ingot, melted by medium frequency induction furnace, furan resin sand casting, molding sand ratio is quartz sand weight: resin weight: curing agent (p-toluenesulfonic acid) weight = 100: 1: 0.4, test block It is a standard Y-shaped test block. In order to enhance the compactness of the structure, a 20mm thick cold iron is embedded in the bottom of the sand mold.

[0023] According to the formula (mass percentage content) in the experiment, Al: 3.0%, Cr: 16.49%, Ni: 13.58%, Mo: 1.94%, Mn: 1.94%, Si: 0.97%, C: 0.0291%, and the balance is Fe , Weigh the corresponding components, and calculate the burning loss of Al as 30%, a total of 15kg. The weighed alloys are loaded into the furnace in a certain order, and the heating system is heated up. Keep the temperature at about 700°C for 30 minutes, continue to heat to 1540°C, h...

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Abstract

The invention discloses high-alumina 316L stainless steel and a preparation method thereof. The high-alumina 316L stainless steel comprises the following ingredients by mass percent: 12.00-16.00% of Ni, 16.00-19.00% of Cr, no more than 1.0% of Si, no more than 0.035% of P, no more than 0.03% of S, no more than 0.03% of C, 1.8-2.5% of Mo, no more than 2.0% of Mn, 1.5-3.0% of Al, and the balance of Fe. The preparation method comprises the steps of (1) preparing materials according to the ingredients according to claim 1, wherein the furnace charge is a 316L stainless steel plate and industrial aluminum ingots; (2) heating the furnace charge to 700 DEG C under an atmosphere environment, carrying out heat preservation for half an hour; then heating until the melting temperature is 1540 DEG C, and carrying out heat preservation for 20 minutes; (3) pouring molten steel into a cast mold; and (4) carrying out solution treatment method, namely heating cast alloy to 1050 DEG C in a chamber electric furnace, carrying out heat preservation for 30 minutes, and then carrying out water-cooling treatment.

Description

technical field [0001] The invention relates to the preparation technology of 316L stainless steel. Background technique [0002] 316L stainless steel is a type of stainless steel containing Mo. Due to the addition of molybdenum, the ability of steel to resist pitting corrosion and crevice corrosion is enhanced, and the tendency of sensitization is reduced at the same time. It has excellent corrosion resistance to chloride corrosion, high temperature vulcanization, high temperature organic acid, non-oxidizing acid and other media, and has good radiation resistance. Therefore, it is widely used in marine engineering, petrochemical and nuclear engineering and other fields. The matrix of 316L is an austenite structure, which does not undergo phase transformation at high temperature, so it cannot be strengthened by heat treatment, but its strength can be improved by working hardening through cold working deformation. The corrosion resistance of the commonly used 316L stainless ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C22C38/44C22C38/06C22C33/06
Inventor 喇培清撒兴瑞孟倩张鹏魏玉鹏卢学峰郭鑫
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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