Nimonic 263

Haynes Alloy 263 | Nickel Alloy 263 | Nicrofer 5120 | Hastelloy C263 | UNS N07263 | AMS 5872 | ALLOY 263 | DIN 2.4650

NIMONIC alloy 263 (UNS N07263/W. Nr. 2.4650), an air melted nickel-base alloy, was developed by RollsRoyce (1971) Ltd. to provide a sheet material which could be readily fabricated and would offer improved ductility in welded assemblies to replace NIMONIC alloy 80A.

It was designed as sheet material to meet specific design criteria in terms of proof stress and creep strength. It is now available in all standard forms.

The welding techniques for this alloy are similar to those in common use for other age-hardenable nickelbase alloys. During salvage welding operations, a preweld heat-treatment is not necessary on age-hardened assemblies but a subsequent age-hardening treatment is desirable after all salvage welding is completed. Material will age in service if temperatures are above 750°C.

Composition

The composition in BS HR 10 is as follows :-

  • Carbon ………………………………………………………………0.04-0.08
  • Silicon ……………………………………………………………….0.40 max.
  • Manganese ………………………………………………………..0.60 max.
  • Sulfur ………………………………………………………………0.007 max.
  • Silver……………………………………………………………..0.0005 max.
  • Aluminum…………………………………………………………..0.60 max.
  • Boron ………………………………………………………………0.005 max.
  • Bismuth………………………………………………………….0.0001 max.
  • Cobalt………………………………………………………………..19.0-21.0
  • Chromium…………………………………………………………..19.0-21.0
  • Copper………………………………………………………………0.20 max.
  • Iron……………………………………………………………………..0.7 max.
  • Molybdenum ………………………………………………………….5.6-6.1
  • Lead………………………………………………………………0.0020 max.
  • Titanium…………………………………………………………………1.9-2.4
  • Aluminum and titanium ……………………………………………2.4-2.8
  • Nickel………………………………………………………………….Balance

Reference to the ‘balance’ of an alloy’s composition does not guarantee this is exclusively of the element mentioned, but that it predominates and others are present only in minimal quantities.

Heat Treatment

NIMONIC alloy 263 is normally given a two-stage heat treatment, that is, solution treatment and age hardening prior to service. This heat treatment is normally carried out in air. Material is usually supplied in the solution treated condition and aged by the customer as part of the fabrication process. Material can however be supplied to any requested heat treatment condition. Details of recommended heat-treatments for various forms are given below, where the time at solution treatment temperature depends on section thickness.

Specifications

UNS N07263
MSRR 7035
MSRR 7036
GE B50A774A
Nicrofer 5120
Hastelloy C263
Nimonic 263
Werkstoff Nr. 2.4650
BS HR10 Rod and Bar
BS HR 206 Plate, Sheet, Strip
BS HR 404 Seamless Tube
AECMA PrEn 2199 Bar
AECMA PrEn 2200 Forgings
AECMA PrEn 2201 Bar
AECMA PrEn 2202 Tube
AECMA PrEn 2203 Sheet, Strip
AECMA PrEn 2418 Plate
DIN 17750 Plate, Sheet, Strip
DIN 17751 Pipe and Tube
DIN 17752 Bar and Rod
DIN 17753 Wire
DIN 17754 Forgings
AMS 5872 Sheet, Plate and Strip
AMS 5886 Bar, Forgings, Rings
AFNOR NCK 20 D
AIR 9165 Sheet, Plate, Rod, Bar and Forgings

 

FountainHead Alloys is ISO 9001:2015 approved. © FountainHead Alloys 1996