Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Age-hardenable, corrosion resistant ni-cr-mo alloys

An age-hardening, corrosion-resistant technology, applied in the field of wrought nickel alloys, which can solve the problems of uneven nucleation, slowness, long time, etc.

Inactive Publication Date: 2005-03-09
HAYNES INTERNATIONAL
View PDF11 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reaction is slow at lower temperatures in this range; for example, it has been established that at 425 °C in C-276 alloy for A 2 B the reaction will take more than 38000 hours
[0015] 2. At a temperature above 650°C, the three precipitated phases can nucleate unevenly on the grain boundary or on the twin boundary
For many compositions, this two-step heat treatment is effective in causing strengthening, whereas here the aging treatment in a single step would take significantly longer

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Age-hardenable, corrosion resistant ni-cr-mo alloys

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0030] I present a Ni-Cr-Mo based alloy containing 19.5-22.0wt% Cr and 15.0-17.5% Mo which can be age hardened in 48 hours or less to produce high tensile strength while maintaining high ductility and corrosion resistance in oxidizing and reducing media. However, I have found that its overall composition should be controlled such that it has a P value between 33.5 and 35.9, where the P value is defined by the following equation:

[0031] P=2.64Al+0.19Co+0.83Cr-0.16Cu+0.39Fe+0.52Hf+0.59Mn+1.0Mo+0.68Nb+2.15Si+1.06V+0.39W+0.45Ta+1.35Ti+0.81Zr

[0032] And the element composition is given in weight percent.

[0033] A total of 18 Ni-Cr-Mo alloys were tested. Of these, 17 were experimental alloys (designated Alloy A through Alloy Q) and one was the commercial INCONEL 686 alloy. The compositions of all 18 alloys are given in Table 2 along with the calculated P values ​​for each composition.

[0034] Table 2

[0035] The alloy compositions tested in this study

[0036] ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
yield strengthaaaaaaaaaa
yield strengthaaaaaaaaaa
Login to View More

Abstract

A nickel-chromium-molybdenum alloy capable of being age hardened for improved strength while maintaining high corrosion resistance contains in weight percent 19.5 to 22 chromium, 15 to 17.5 molybdenum, up to 3 iron, up to 1.5 manganese, up to 0.5 aluminum, up to 0.02 carbon, up to 0.015 boron, up to 0.5 silicon, up to 1.5 tungsten and up to 0.5 of each of hafnium, tantalum and zirconium, with a balance of nickel and impurities. Certain alloying elements must be present in amounts according to an equation here disclosed.

Description

technical field [0001] The present invention relates to a wrought nickel alloy which contains significant amounts of chromium and molybdenum, together with other essential trace elements to allow good and economical melting and wrought handling, which can be age hardened to provide high strength, It has high resistance to uniform corrosive attack by oxidizing and reducing media in age-hardening conditions. Background technique [0002] Wrought nickel-chromium-molybdenum (C-type) alloy is a common structural material in the chemical process industry. Its main features are high corrosion resistance to hydrohalic acids, especially hydrochloric acid, and high resistance to corrosion phenomena caused by chlorides, such as pitting, crevice erosion and stress corrosion cracking. In contrast, austenitic and duplex stainless steels show poor resistance to phenomena caused by hydrohalic acids and chlorides. [0003] The basic structure of wrought C-type alloys is face-centered cubic...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/05C22C1/04C22C19/03C22C38/44C22F1/10
CPCC22C1/0433C22C19/056C22C19/055C22C19/05C22C19/03
Inventor M·派克·小李
Owner HAYNES INTERNATIONAL
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com