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High-strength and high-corrosion-resistant ni-based alloy having excellent hot forgeability

A high-corrosion-resistant, high-strength technology, applied in the field of high-strength and high-corrosion-resistant Ni-based alloys with excellent hot forgeability, to achieve the effects of excellent yield strength, excellent effect, and excellent hot forgeability

Active Publication Date: 2018-10-23
HITACHI METALS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The corrosion resistance of said UNS N07725 is better than UNS N07718, but on the other hand, the 0.2% condition yield strength is 965MPa, which is worse than UNS N07718

Method used

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  • High-strength and high-corrosion-resistant ni-based alloy having excellent hot forgeability
  • High-strength and high-corrosion-resistant ni-based alloy having excellent hot forgeability
  • High-strength and high-corrosion-resistant ni-based alloy having excellent hot forgeability

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Embodiment

[0107] By adopting a conventional vacuum high-frequency melting furnace, melting a Ni-based alloy with a specified composition, and melting about 10 kg of a cylindrical ingot of 80mmφ×240mm, the smelted material of the Ni-based alloy is obtained. By performing homogenization heat treatment on the ingot at 1230° C. for 10 hours and water cooling, the Ni-based alloys 1 to 46 of the present invention shown in Tables 1 to 3 and the comparative Ni-based alloys 1 to 26 shown in Tables 4 and 5 were prepared. . In addition, for the forging trial production, there was a shrinkage cavity caused by casting at the end, so the shrinkage cavity portion (about 2 kg from the upper side) was removed. In addition, defects such as blemishes on the surface were removed by grinding with a grinder.

[0108] In addition, commercially available aging heat-treated product round bars were purchased and used as conventional Ni-based alloys 1 to 3 shown in Table 6. It should be noted that the conventio...

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Abstract

Provided is a high-strength and high-corrosion-resistant Ni-based alloy having excellent hot forgeability, which is suitable for a member for oil drilling. The high-strength and high-corrosion-resistant Ni-based alloy having excellent hot forgeability, which is suitable for a member for oil drilling, contains, in mass%, 42.1-45.5% of Cr, 0.5-2.5% of Nb, 1.2-2.0% of Ti, 0.0001-0.0090% of Mg, 0.001-0.040% of N, 0.01-0.50% of Mn, 0.001-0.050% of Si, 0.01-1.00% of Fe, 0.01%-2.50% of Co, not less than 0.001% but less than 0.500% of Cu, 0.001-0.050% of Al, not less than 0.005% but less than 0.100% of V, 0.0001-0.0100% of B, and 0.001-0.050% of Zr, the balance being Ni and incidental impurities, and preferably further contains any of 0.1-1.5% of Mo, 0.1-1.5% of W, not less than 0.001% but less than 0.050% of Ca, and not less than 0.001% but less than 0.050% of Ta.

Description

technical field [0001] The present invention relates to a high-strength, high-corrosion-resistant Ni-based alloy with excellent hot forgeability, in particular to a high-strength, high-corrosion-resistant Ni-based alloy suitable for forming large-shaped components, which are used for mining oil 1. The components of natural gas, especially in the large depth of thousands of meters underground, the pressure is very high, and the high-temperature corrosion environment of about 200 ° C containing hydrogen sulfide and chloride requires high-strength and high-corrosion-resistant components. Background technique [0002] Conventionally, high strength (especially 0.2% conditional yield strength) has been mainly required for materials used for oil and gas excavation. As a material for meeting such demands, Ni alloy called UNS N07718 (equivalent to INCONEL 718 (registered trademark)) is most commonly used (see Patent Document 1: Age-hardenable nickel alloy)). Here, "UNS" means "Unifi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/05
CPCC22C19/052
Inventor 菅原克生
Owner HITACHI METALS LTD
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