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Improved corrosion-resistant superaustenitic stainless steel and preparation method thereof

A kind of austenitic stainless steel, corrosion-resistant technology, applied in the field of improved corrosion-resistant super austenitic stainless steel and its preparation, can solve the problem that N08367 super austenitic stainless steel can not fully meet the actual needs, and achieve the improvement of intergranular corrosion Performance, reduction of forming tendency, effect of increasing strength

Inactive Publication Date: 2019-07-30
STATE POWER INVESTMENT CORP RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In summary, with the development of modern industry, the requirements for material properties and service life are gradually increasing, and N08367 super austenitic stainless steel can no longer fully meet the actual needs

Method used

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  • Improved corrosion-resistant superaustenitic stainless steel and preparation method thereof
  • Improved corrosion-resistant superaustenitic stainless steel and preparation method thereof
  • Improved corrosion-resistant superaustenitic stainless steel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] Mix the iron-vanadium alloy, iron-niobium alloy, molten iron, nickel, chromium, and molybdenum to obtain a molten liquid; refining the molten liquid and rare earth yttrium at 1550 degrees Celsius by argon-oxygen decarburization method to obtain a refined liquid; The refined liquid is sent to the ladle refining furnace for refining at 1500 degrees Celsius, so as to obtain an improved corrosion-resistant super austenitic stainless steel. The composition of the improved corrosion-resistant super austenitic stainless steel is: carbon 0.015wt%, silicon 0.43wt%, manganese 0.1wt%, phosphorus 0.015wt%, sulfur 0.001wt%, chromium 21.5wt%, nickel 24.5wt%, molybdenum 6.2wt%, vanadium 2.8wt%, niobium 2.5wt%, nitrogen 0.24wt%, rare earth yttrium 0.05wt% and the balance iron. The performance tests and results are shown in Table 1:

[0074] Table 1 Various performance tests and results of stainless steel in Example 1

[0075]

Embodiment 2

[0077] Mix the iron-vanadium alloy, iron-niobium alloy, molten iron, nickel, chromium, and molybdenum to obtain a molten liquid; refining the molten liquid and rare earth lanthanum by argon-oxygen decarburization at 1620 degrees Celsius to obtain a refined liquid; The refined liquid is sent to the ladle refining furnace for refining at 1520 degrees Celsius, so as to obtain an improved corrosion-resistant super austenitic stainless steel. The improved corrosion-resistant super austenitic stainless steel consists of 0.014wt% carbon, 0.42wt% silicon, 0.15wt% manganese, 0.015wt% phosphorus, 0.001wt% sulfur, 21.2wt% chromium, 24.2wt% nickel, molybdenum 6.0wt%, vanadium 2.5wt%, niobium 2.5wt%, nitrogen 0.22wt%, lanthanum 0.03wt% and the balance iron. The various performance tests and results are shown in Table 2:

[0078] Table 2 Example 2 stainless steel performance test and results

[0079]

Embodiment 3

[0081] Mix the ferro-vanadium alloy, molten iron, nickel, chromium and molybdenum and then smelt to obtain a molten liquid; perform argon-oxygen decarburization refining at 1640 degrees Celsius to obtain a refined liquid; send the refined liquid to a ladle refining furnace Refining at 1540 degrees Celsius to obtain improved corrosion-resistant super austenitic stainless steel. The composition of the improved corrosion-resistant super austenitic stainless steel is: carbon 0.012wt%, silicon 0.46wt%, manganese 0.18wt%, phosphorus 0.011wt%, sulfur 0.001wt%, chromium 22wt%, nickel 25.0wt%, molybdenum 6.3 wt%, vanadium 2.5wt%, nitrogen 0.20wt% and the balance iron. The various performance tests and results are shown in Table 3:

[0082] Table 3 Various performance tests and results of stainless steel in Example 3

[0083]

[0084]

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PUM

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Abstract

The invention discloses improved corrosion-resistant superaustenitic stainless steel and a preparation method thereof. The stainless steel comprises the following components of, by weight, 0.01 wt%-0.02 wt% of carbon, 0.4 wt%-0.6 wt% of silicon, 0 wt%-0.2 wt% of manganese, 0 wt%-0.02 wt% of phosphorus, 0 wt% to 0.01 wt% of sulfur, 21 wt%-22 wt% of chromium, 24 wt%-25.5 wt% of nickel, 6.0 wt%-7.0 wt% of molybdenum, 1 wt%-3 wt% of vanadium, 0 wt%-3 wt% of niobium, 0.20 wt%-0.25 wt% of nitrogen, 0 wt%-0.1 wt% of rare earth elements and the balance iron. The improved corrosion-resistant superaustenitic stainless steel does not add manganese or has a low manganese element content, is high in nitrogen content, good in normal-temperature resistance and high-temperature corrosion resistance, highin strength and excellent in comprehensive performance.

Description

Technical field [0001] The invention belongs to the field of nitrogen-containing corrosion-resistant stainless steel. Specifically, the invention relates to an improved corrosion-resistant super austenitic stainless steel and a preparation method thereof. Background technique [0002] N08367 stainless steel (also known as AL-6XN) is a nitrogen-strengthened austenitic stainless steel, also known as super austenitic stainless steel due to its excellent comprehensive properties. According to ASTM B690 standard, the chemical composition of N08367 stainless steel is as follows: C≤0.03%, Mn≤2.0%, Si≤1.0%, P≤0.04%, S≤0.03%, Cr: 20.0%~22.0%, Ni: 23.5%~25.5 %, Mo: 6.0%~7.0%, N: 0.18%~0.25%, Cu≤0.75%. A major feature of N08367 stainless steel is the addition of nitrogen to the steel, which can expand the austenite phase region and replace part of the alloy element nickel. In the harsh environment, the nitrogen elements are CrN, NH 4 + , NH 3 , N(atom), N 2 The (free) form is enriched on ...

Claims

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Application Information

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IPC IPC(8): C22C33/06C21C7/068C22C38/02C22C38/04C22C38/44C22C38/46C22C38/48
CPCC21C7/068C22C33/06C22C38/001C22C38/002C22C38/005C22C38/02C22C38/04C22C38/44C22C38/46C22C38/48
Inventor 卢华兴羊浩燕鹏杨万强夏海鸿李怀林
Owner STATE POWER INVESTMENT CORP RES INST
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