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Nickel-based corrosion-resistant alloy and preparation method

A corrosion-resistant alloy and nickel-based technology, applied in the field of nickel-based corrosion-resistant alloys, can solve problems such as manpower and material resources consumption, achieve the effects of reducing production process costs, shortening desensitization heat treatment time, and improving depletion conditions

Active Publication Date: 2016-06-29
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, long-term vacuum treatment and forced cooling have put forward very high requirements on production equipment and brought a lot of manpower and material resources consumption

Method used

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  • Nickel-based corrosion-resistant alloy and preparation method
  • Nickel-based corrosion-resistant alloy and preparation method
  • Nickel-based corrosion-resistant alloy and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Vacuum induction plus electroslag remelting smelting process was used to smelt one furnace of the alloy of the present invention (1# alloy) and one furnace of traditional 690 alloy (0# alloy, for comparison), and the chemical composition weight % was as follows.

[0034] 1#: C0.016, Cr30.34, Fe9.70, V0.51, Nb0, Ti0.26, Al0.34, Si0.24, Mn0.20, the rest are Ni and unavoidable impurities.

[0035] 0#: C0.023, Cr30.34, Fe9.67, V0, Nb0, Ti0.26, Al0.31, Si0.26, Mn0.24, the rest are Ni and unavoidable impurities.

[0036] After the 0# alloy is forged and rolled into plates, it is subjected to solution heat treatment (1090°C×1min / mm) and desensitization heat treatment (715°C×15h).

[0037] After the 1# alloy is forged and rolled into a plate, it is subjected to a solution heat treatment (1090°C×1min / mm), then an intermediate heat treatment of 900°C×2h, and then a desensitization heat treatment (715°C×2h).

[0038] The two alloy samples were tested for intergranular corrosion r...

Embodiment 2

[0045] Vacuum induction plus electroslag remelting smelting process was used to smelt one furnace of the alloy of the present invention (2# alloy), and still compared with the traditional 690 alloy of 0#. The weight % of chemical composition of 2# alloy is as follows.

[0046] 2#: C0.020, Cr29.82, Fe9.87, V0.86, Nb0.024, Ti0.01, Al0.25, Si0.23, Mn0.24, the rest are Ni and unavoidable impurities.

[0047] After the 2# alloy is forged and rolled into a plate, it is subjected to solution heat treatment (1090°C×1min / mm), then to 900°C×2h for intermediate heat treatment, and then to desensitization heat treatment (715°C×2h).

[0048] The same test method as in Example 1 was used to test the resistance to intergranular corrosion and pitting corrosion of the two alloys, and the results are also shown in Table 1. It can be seen that the alloy 2# alloy of the present invention (the V content is increased to 0.86%, containing a small amount of Nb,

[0049] The comprehensive corrosion ...

Embodiment 3

[0051] Vacuum induction plus electroslag remelting smelting process was used to smelt one furnace of the alloy (3# alloy) of the present invention, and still compared with the traditional 690 alloy of 0#. The weight % of chemical composition of 3# alloy is as follows.

[0052] 3#: C0.020, Cr29.95, Fe9.70, V0.05, Nb1.06, Ti0.005, Al0.25, Si0.23, Mn0.19, the rest are Ni and unavoidable impurities.

[0053] After the 3# alloy is forged and rolled into a plate, it is subjected to solution heat treatment (1090°C×1min / mm), then to 900°C×2h for intermediate heat treatment, and then to desensitization heat treatment (715°C×2h).

[0054] The same test method as in Example 1 was used to test the resistance to intergranular corrosion and pitting corrosion of the two alloys, and the results are also shown in Table 1. It can be seen that the overall corrosion resistance of the alloy 3# alloy (Nb content increased to 0.86%, containing a small amount of V, (V+Nb) / C=56) of the present invent...

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Abstract

The invention relates to nickel-based corrosion-resistant alloy and a preparation method thereof. The nickel-based corrosion-resistant alloy comprises, by mass percentage, 0-0.02% of C, 29.0-31.0% of Cr, 9.0-11.0% of Fe, 0.3-1.0% of V, 0-1.0% of Nb, 0-0.3% of Ti, 0-0.4% of Al, 0-0.4% of Al, 0-0.3% of Si, 0-0.3% of Mn and the balance Ni and unavoidable impurities, and the (Nb+V) / C value is larger than or equal to 30. The nickel-based corrosion-resistant alloy is smelted through vacuum induction and electroslag remelting processes. After the alloy is forged and rolled to form plates, the plates are firstly subjected to solution treatment at the temperature of 1050-1150 DEG C for 0.5-3 min / mm, then subjected to intermediate heat treatment at the temperature of 800-1000 DEG C for 1-4 h and finally subjected to desensitization heat treatment at the temperature of 700-730 DEG C for 1-3.5 h. The nickel-based corrosion-resistant alloy has high intergranular corrosion resistance.

Description

technical field [0001] The invention belongs to the technical field of nickel-based alloys, in particular to an ultra-low-carbon, vanadium-containing and niobium-containing nickel-based corrosion-resistant alloy with high corrosion resistance. Background technique [0002] Many equipment in the primary and secondary circuit systems of nuclear power plants (such as steam generator heat transfer tubes, water chamber partitions, pressure vessel penetrations, blasting valve shear covers, etc.) face a large number of pitting corrosion, intergranular corrosion, and stress corrosion threats. The overall corrosion resistance of the materials used in these nuclear grade components is critical. Taking the heat transfer tube of a nuclear first-class steam generator as an example, in order to meet the use requirements, foreign countries have developed a variety of heat transfer tube materials. Around 1970, the 600 alloy (Cr: 14-17%, Fe: 6-10%, Ni: the balance) was used, but it was foun...

Claims

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Application Information

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IPC IPC(8): C22C19/05C22C32/00C22F1/10
CPCC22C19/058C22C32/0052C22F1/10
Inventor 丰涵宋志刚郑文杰朱玉亮
Owner CENT IRON & STEEL RES INST
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