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High-strength and high-toughness austenitic stainless steel material

A technology of austenitic stainless steel and high toughness, which is applied in the field of austenitic stainless steel, can solve the problems of decreased toughness of stainless steel wire, difficulty in popularizing and popularizing austenitic stainless steel wire, and low elongation.

Active Publication Date: 2013-12-25
CHONGQING MATERIALS RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In order to improve the tensile strength, the number of heat treatments must be reduced to increase the amount of cold deformation. However, the large cold deformation of austenitic stainless steel wire will induce martensitic transformation of the alloy and form a large number of hard and brittle intermetallic phases. As a result, the surface quality of the drawn stainless steel wire is reduced, and the elongation rate under high strength will be very low. Difficulties

Method used

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  • High-strength and high-toughness austenitic stainless steel material

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Embodiment 1

[0040] The high-strength and high-toughness austenitic stainless steel wire described in embodiment 1 is tested for mechanical properties, and the main properties are as follows:

[0041] 1. Mechanical properties of alloy rods (solid solution state):

[0042] Solid solution process: 1050℃×30 minutes + water quenching

[0043] 1) Tensile strength: σ b =525MPa;

[0044] 2) Yield strength: σ 0.2 =210MPa;

[0045] 3) Elongation after break: δ 5 =50%;

[0046] 4) Reduction of area: Ψ=80%;

[0047] 5) Hardness: HB=135.

[0048] 2. Mechanical properties of alloy wire (cold drawn state):

[0049] Tensile strength at cold deformation (80.0%): σ b =1400MPa;

[0050] Tensile strength at cold deformation (95.0%): σ b =2000MPa;

[0051] 3. Impact toughness of alloy (solid solution state):

[0052] Impact toughness α KU ≥3600 (KJ / m 2 ).

Embodiment 2

[0053] The high-strength and high-toughness austenitic stainless steel wire material described in embodiment 2 is tested for mechanical properties, and the main properties are as follows:

[0054] 1. Mechanical properties of alloy rods (solid solution state):

[0055] Solid solution process: 1050℃×30 minutes + water quenching

[0056] 1) Tensile strength: σ b=530MPa;

[0057] 2) Yield strength: σ 0.2 =215MPa;

[0058] 3) Elongation after break: δ 5 =50%;

[0059] 4) Reduction of area: Ψ=78%;

[0060] 5) Hardness: HB=145.

[0061] 2. Mechanical properties of alloy wire (cold drawn state):

[0062] Tensile strength at cold deformation (90.0%): σ b =1700MPa.

[0063] Tensile strength at cold deformation (95.0%): σ b =2100MPa.

[0064] 3. Impact toughness of alloy (solid solution state):

[0065] Impact toughness α KU ≥3600 (KJ / m 2 ).

Embodiment 3

[0066] The high-strength and high-toughness austenitic stainless steel wire material described in embodiment 3 is tested for mechanical properties, and the main properties are as follows:

[0067] 1. Mechanical properties of alloy rods (solid solution state):

[0068] Solid solution process: 1050℃×30 minutes + water quenching

[0069] 1) Tensile strength: σ b =540MPa;

[0070] 2) Yield strength: σ 0.2 =230MPa;

[0071] 3) Elongation after break: δ 5 =55%;

[0072] 4) Reduction of area: Ψ=78%;

[0073] 5) Hardness: HB=155.

[0074] 2. Mechanical properties of alloy wire (cold drawn state):

[0075] Tensile strength at cold deformation (90.0%): σ b =1900MPa.

[0076] Tensile strength at cold deformation (95.0%): σ b =2250MPa.

[0077] 3. Impact toughness of alloy (solid solution state):

[0078] Impact toughness α KU ≥3500 (KJ / m 2 ).

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Abstract

The invention relates to a high-strength and high-toughness austenitic stainless steel material. The high-strength and high-toughness austenitic stainless steel material comprises the following components in percentage by weight: 12.0-14.0% of Cr, 12.0-16.0% of Ni, 1.0-3.0% of Mo, 0.04-0.08% of C, 0.1-1.0% of Al, 0.1-1.0% of Mn, 0.1-1.0% of Si, less than 0.04% of inevitable impurities and the balance of Fe. The cold processing performance and tensile strength of the material are not lower than those of a 1Cr8Ni9Ti stainless steel wire, the toughness and surface quality of the material are more excellent than those of the 1Cr8Ni9Ti stainless steel wire, and the corrosion resistance to a large number of inorganic acids (such as sulfuric acid, nitric acid and the like), salts and seawater is significantly upgraded in comparison with 18-8 type steel.

Description

technical field [0001] The invention relates to an austenitic stainless steel, in particular to a high-strength, high-toughness austenitic stainless steel material. Background technique [0002] Stainless steel wire (material) can generally be divided into three types, namely austenitic stainless steel wire, ferritic stainless steel wire and martensitic stainless steel wire. Austenitic stainless steel wire generally improves its strength performance through large cold deformation, such as the common 18-8 series of 1Cr8Ni9Ti stainless steel wire. In order to improve the tensile strength, the number of heat treatments must be reduced to increase the amount of cold deformation. However, the large cold deformation of austenitic stainless steel wire will induce martensitic transformation of the alloy and form a large number of hard and brittle intermetallic phases. As a result, the surface quality of the drawn stainless steel wire is reduced, and the elongation rate under high s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/44
Inventor 郭卫民
Owner CHONGQING MATERIALS RES INST
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