Hafnium-zirconium-titanium-molybdenum strengthened austenitic stainless steel and preparation method thereof

A technology of austenitic stainless steel and zirconium titanium, which is applied in the field of austenitic stainless steel, can solve the problems of austenitic stainless steel, such as low corrosion resistance, low mechanical properties or plasticity, unstable mechanical properties, and easy hot embrittlement, etc. Radiation resistance, simple preparation method, and the effect of improving strength

Active Publication Date: 2019-11-22
NANJING YOUTIAN METAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Although the above two technical solutions can enhance the performance of austenitic stainless steel to a certain extent, the corrosion resistance, mechanical properties or plasticity of the obtained austenitic stainless steel are still low; Although copper can promote crystallization, it is prone to hot embrittlement in the process of thermal processing, resulting in insufficient stability of its mechanical properties, making it a certain shackle in the industrial production process.

Method used

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  • Hafnium-zirconium-titanium-molybdenum strengthened austenitic stainless steel and preparation method thereof
  • Hafnium-zirconium-titanium-molybdenum strengthened austenitic stainless steel and preparation method thereof
  • Hafnium-zirconium-titanium-molybdenum strengthened austenitic stainless steel and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Select pure iron, metal chromium, metal nickel, metal manganese, metal hafnium, metal molybdenum, metal zirconium, metal titanium, iron silicon, iron carbon block raw materials, the composition of the prepared austenitic stainless steel is as follows: C=0.05, Ni=14, Cr=17, Mo=3, Ti=0.1, Hf=0.37, Zr=0.24, Mn=2, Si=1, P≤0.035, S≤0.030, Fe balance.

[0031] Cast alloy ingots by arc melting or induction melting; smelting is carried out in vacuum or argon protection, and magnetic stirring technology is used to mix the metal solution evenly during the melting process; protection casting is carried out under vacuum or argon protection, and the size is cast into square or round ingot;

[0032] The ingot is hot-rolled by a rolling mill. The hot-rolling plan is to heat the billet to 1150±10°C, heat it for 24 hours and then roll it out of the furnace. The hot-rolling start temperature is 1150±20°C, the final rolling temperature is ≥950°C, and the plate is hot-rolled. The total am...

Embodiment 2

[0037] Select pure iron, metal chromium, metal nickel, metal manganese, metal hafnium, metal molybdenum, metal zirconium, metal titanium, iron silicon, iron carbon block raw materials, the composition of the prepared austenitic stainless steel is as follows: C=0.05, Ni=14, Cr=17, Mo=3, Ti=0.1, Hf=0.7, Zr=0.24, Mn=2, Si=1, P≤0.035, S≤0.030, Fe=balance.

[0038] Cast alloy ingots by arc melting or induction melting; smelting is carried out in vacuum or argon protection, and magnetic stirring technology is used to mix the metal solution evenly during the melting process; protection casting is carried out under vacuum or argon protection, and the size is cast into square or round ingot;

[0039] The ingot is hot-rolled by a rolling mill. The hot-rolling plan is to heat the billet to 1200°C±10°C, heat it for 12 hours and then roll it out of the furnace. The hot-rolling start temperature is 1180°C±20°C, and the final rolling temperature is ≥950°C. The total amount of hot rolling ≥ ...

Embodiment 3

[0044] Select pure iron, metal chromium, metal nickel, metal manganese, metal hafnium, metal molybdenum, metal zirconium, metal titanium, iron silicon, iron carbon block raw materials, the composition of the prepared austenitic stainless steel is as follows: C=0.05, Ni=14, Cr=17, Mo=3, Ti=0.1, Hf=1, Zr=0.24, Mn=2, Si=1, P≤0.035, S≤0.030, Fe=balance.

[0045] Cast alloy ingots by arc melting or induction melting; smelting is carried out in vacuum or argon protection, and magnetic stirring technology is used to mix the metal solution evenly during the melting process; protection casting is carried out under vacuum or argon protection, and the size is cast into square or round ingot;

[0046] The ingot is hot-rolled by a rolling mill. The hot-rolling plan is to heat the billet to 1250°C±10°C, heat it for 10 hours and then roll it out of the furnace. The hot-rolling start temperature is 1250°C±20°C, and the final rolling temperature is ≥950°C. The total amount of hot rolling ≥ 60...

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Abstract

The invention discloses hafnium-zirconium-titanium-molybdenum strengthened austenitic stainless steel and a preparation method thereof. The austenitic stainless steel is prepared from, by mass, smaller than or equal to 0.05% of C, 10.0%-14.0% of Ni, 15.0%-19.0% of Cr, smaller than or equal to 0.1% of Ti, 2.0%-3.0% of Mo, smaller than or equal to 1% of Hf, smaller than or equal to 0.24% of Zr, smaller than or equal to 2.0% of Mn, smaller than or equal to 1.0% of Si, smaller than or equal to 0.035% of P, smaller than or equal to 0.030% of S and the balance Fe, wherein the content of Hf is largerthan or equal to 14.86*C / 2 and smaller than or equal to 1, and the content of Zr is larger than or equal to 0.1 and smaller than or equal to 7.6*C / 2+0.05. The preparation method comprises the following steps of (1) smelting and casting of the stainless steel, (2) hot-rolling cogging, (3) cold-rolling deformation and (4) high-temperature heat treatment. According to the hafnium-zirconium-titanium-molybdenum strengthened austenitic stainless steel and the preparation method thereof, zirconium, hafnium, titanium and molybdenum are added into the stainless steel, not only can the strength be improved, but also the irradiation resistance of the austenitic stainless steel can be improved; and in a H2SO4 electrolyte of 0.5 mol / L at 80 DEG C, the corrosion rate of the austenitic stainless steel ranges from 10.2 microamps / cm<2> to 16.2 microamps / cm<2>, the plasticity of the austenitic stainless steel is higher than 43%, and the tensile strength is higher than 822 MPa.

Description

technical field [0001] The invention relates to a hafnium-zirconium-titanium-molybdenum reinforced austenitic stainless steel and a preparation method thereof, belonging to the field of austenitic stainless steel. Background technique [0002] Facing the current increasingly severe resource, energy and environmental problems, the sustainable development of energy has become particularly important. Nuclear power is one of the important sources of large-scale sustainable supply of electric energy in the world today. A nuclear power plant is a new type of power station that uses the energy in the nucleus of an atom to generate electricity on a large scale. Nuclear power currently accounts for approximately 16% of the world's total electricity generation. Austenitic stainless steel is widely used in the field of nuclear power because of its excellent corrosion resistance, but it is also very susceptible to corrosion by aggressive ions, stress corrosion and pitting, and under h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C22C38/50C22C38/44C22C38/04C22C38/02C22C33/06C21D8/02C21D1/26C21D1/18
CPCC21D1/18C21D1/26C22C33/06C22C38/002C22C38/02C22C38/04C22C38/44C22C38/50C22C38/58
Inventor 张中武李俊澎
Owner NANJING YOUTIAN METAL TECH
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