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Double-phase stainless steel material of valve and preparation method of double-phase stainless steel material

A duplex stainless steel and valve technology, applied in the field of iron and steel metallurgy, can solve problems such as rising raw material prices, and achieve the effects of small hot cracking tendency, cost reduction, and good chloride stress corrosion resistance.

Active Publication Date: 2015-02-18
QINGDAO POWER STATION VALVE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] However, with the energy shortage in our country and the rising price of raw materials, the 300 series stainless steel valve products, which are highly alloyed, are facing the problem of how to save and effectively use resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A valve duplex stainless steel material, the components and their mass percentages are:

[0043] C: 0.02%,

[0044] Cr: 18%,

[0045] Mn<1.5%,

[0046] Ni: 3.5%,

[0047] N: 0.2%,

[0048] Mo: 3.5%,

[0049] The balance is Fe.

[0050] A preparation method for a duplex stainless steel material for a valve, comprising the following steps:

[0051] In the first step, FeCa alloy is used to desulfurize pure Fe, and Cr, Ni, Mn, and Mo are subjected to high-temperature vacuum dehydration and degassing treatment before smelting;

[0052] In the second step, batching is carried out according to the weight of the raw materials used for the steel material used for the valve. Pure Fe is added to the vacuum induction furnace, and then Cr, Ni, and Mo raw materials are added in sequence, and then filled with argon as a protective gas, and the pressure is controlled at 0.005- 0.07MPa, heat up to 1400-1600°C, then add C and Mn;

[0053] In the third step, the smelted steel mate...

Embodiment 2

[0057] A valve duplex stainless steel material, the components and their mass percentages are:

[0058] C: 0.025%,

[0059]Cr: 22%,

[0060] Mn<1.5%,

[0061] Ni: 4.5%,

[0062] N: 0.22%,

[0063] Mo: 4.0%,

[0064] The balance is Fe.

[0065] All the other methods are the same as in Example 1.

Embodiment 3

[0067] A valve duplex stainless steel material, the components and their mass percentages are:

[0068] C: 0.03%,

[0069] Cr: 25%,

[0070] Mn<1.5%,

[0071] Ni: 5.5%,

[0072] N: 0.25%,

[0073] Mo: 4.5%,

[0074] The balance is Fe.

[0075] All the other methods are the same as in Example 1.

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Abstract

The invention discloses a double-phase stainless steel material of a valve. The double-phase stainless steel material comprises the following components in percentage by weight: 0.02-0.04 percent of C, 18-28 percent of Cr, less than 1.5 percent of Mn, 3.5-6.5 percent of Ni, 0.2-0.3 percent of N, 3.5-5.5 percent of Mo and the balance of Fe. Compared with the prior art, the double-phase stainless steel material of the valve has the advantages that nitrogen replaces nickel, and the nickel can be controlled at a proper low content, so that the nickel content is reduced, and the cost is greatly lowered; the corrosion resistance is improved by over 10 percent than the corrosion resistance of stainless steel 304, so that matching of alloy elements is more guaranteed, and a corresponding thermal treatment technology is adopted to enable the proportions of a ferrite phase and an austenite phase to be close to 40-50 percent, so that the raw material cost is reduced, and the requirements of a double-phase stainless steel technology and the corrosion performance are met.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a duplex stainless steel material for valves and a preparation method thereof. Background technique [0002] In recent years, the deep processing technology of petroleum and chemical industry has developed rapidly, and the demand for valves with high temperature resistance, wear resistance, hydrogen corrosion resistance and hydrofluoric acid corrosion resistance has further increased. Due to its excellent corrosion resistance and good mechanical properties, stainless steel valves are widely used in chemical industry, light industry, electric power and other industries, and play an extremely important role in the safety and economic operation of the system. The service conditions of stainless steel valves are very complicated. They are mainly used in toxic, highly corrosive, flammable, explosive, high temperature, high pressure and other dangerous occ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/44C22C33/04
CPCC22C33/04C22C38/001C22C38/44
Inventor 钱国东
Owner QINGDAO POWER STATION VALVE CO LTD
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