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Stainless steel with low cost, high strength and high corrosion resistance and preparation method thereof

A high-corrosion-resistant stainless steel technology, applied in the field of martensitic stainless steel, can solve the problems of low corrosion-resistant mechanical properties and high cost, and achieve the effects of good corrosion resistance, simple preparation method, and strong process controllability

Pending Publication Date: 2021-06-29
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Purpose of the invention: Aiming at the problems of high raw material cost, low corrosion resistance and low mechanical properties of existing ultra-high-strength stainless steel, the present invention provides a low-cost, high-strength, high-corrosion-resistant stainless steel, and provides a Preparation method of martensitic stainless steel

Method used

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  • Stainless steel with low cost, high strength and high corrosion resistance and preparation method thereof
  • Stainless steel with low cost, high strength and high corrosion resistance and preparation method thereof
  • Stainless steel with low cost, high strength and high corrosion resistance and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0044] Select pure iron, metal chromium, metal nickel, metal manganese, metal molybdenum, metal cobalt, metal titanium, iron silicon, iron carbon block raw materials, the composition of stainless steel is as follows (mass percentage): Co=1.0, Cr=12.0, Mn =0.1, Mo=5.0, Ni=7.0, Si=0.1, Ti=0.5, C=0.02, Fe balance.

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

[0046] 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 lower weight is 80%; the ingot can be opened by hot forging, pass rolling or universal rolling;

[0047] The plate is kept warm at 1200°C for 60 minutes, and no protective gas is...

Embodiment 2

[0050] Select pure iron, metal chromium, metal nickel, metal manganese, metal molybdenum, metal cobalt, metal titanium, iron silicon, iron carbon block raw materials, the composition of stainless steel is as follows (mass percentage): Co=4.0, Cr=12.0, Mn =0.1, Mo=5.0, Ni=7.0, Si=0.1, Ti=0.5, C=0.02, Fe balance.

[0051] Cast alloy ingots through arc melting or induction melting; melting is carried out in vacuum or argon protection, and stirring technology is used to mix the metal solution evenly during the melting process; protection casting is performed under vacuum or argon protection, and the size is square ingot or round ingot;

[0052] 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 lower weight is 80%; the ingot can be opened by hot forging, pass rolling or universal rolling;

[0053] The plate is kept warm at 1050°C for 60 minutes, and no protective gas is...

Embodiment 3

[0056] Select pure iron, metal chromium, metal nickel, metal manganese, metal molybdenum, metal cobalt, metal titanium, iron silicon, iron carbon block raw materials, the composition of stainless steel is as follows (mass percentage): Co=6.0, Cr=12.0, Mn =0.1, Mo=5.0, Ni=7.0, Si=0.1, Ti=0.5, C=0.02, Fe balance.

[0057] Cast alloy ingots through arc melting or induction melting; melting is carried out in vacuum or argon protection, and stirring technology is used to mix the metal solution evenly during the melting process; protection casting is performed under vacuum or argon protection, and the size is square ingot or round ingot;

[0058] 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 lower weight is 80%; the ingot can be opened by hot forging, pass rolling or universal rolling;

[0059] The plate is kept warm at 1150°C for 90 minutes, and no protective gas is...

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Abstract

The invention provides stainless steel with low cost, high strength and high corrosion resistance and a preparation method thereof. The stainless steel comprises the following components of, in percentage by mass, 1.0%-6.0% of Co, 6.0%-9.0% of Ni, 9.0%-14.0% of Cr, 0.3%-1.5% of Ti, 4.0% to 7.0% of Mo, 0.08%-1.0% of Mn, 0.08%-0.2% of Si, less than or equal to 0.05% of C, less than or equal to 0.035% of P, less than or equal to 0.030% of S and the balance Fe. The method comprises the following steps of smelting and casting stainless steel; forging or hot rolling cogging; and heat treatment. The tensile strength of the stainless steel can reach 2150 MPa or above, the ductility of the stainless steel is 17% or above, and the spot corrosion potential Epit of the stainless steel is greater than 0.36 VSCE; and the stainless steel with low cost, high strength and high corrosion resistance can be used for key structures of ships, oceanographic engineering, aerospace engineering and the like.

Description

technical field [0001] The invention relates to a low-cost, high-strength, high-corrosion-resistant stainless steel and a preparation method thereof, belonging to the field of martensitic stainless steel. Background technique [0002] Martensitic precipitation strengthened stainless steel is a new steel bell developed in the 1960s. It not only has the strength of maraging strengthened steel but also has the corrosion resistance of stainless steel. Due to its excellent comprehensive mechanical properties, it is often used in key high-end equipment such as aviation, aerospace, and navigation. [0003] The main reason why martensitic precipitation-strengthened stainless steel can achieve ultra-high strength is the superposition of martensitic transformation strengthening and aging precipitation strengthening. In order to obtain excellent comprehensive performance, a large amount of precious metal elements, such as Co, Mo, Ni, etc., must be added in the composition design proc...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/50C22C38/52B21J5/00C21D8/02C22C33/06
CPCC22C38/52C22C38/50C22C38/44C22C38/04C22C38/02C22C33/06B21J5/002C21D8/0205Y02P10/20
Inventor 张中武李俊澎张洋刘力源
Owner HARBIN ENG UNIV
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