Description

UDIMET® alloy 520 is a precipitation hardenable nickel base

Table 1 – Limiting Chemical Composition, %

 

super alloy with an exceptional combination of high-temperature                                                                                                          

 

mechanical properties, corrosion resistance and forgeability characteristics.

Developed for use in the 1400°-1700°F (760°-927°C) temperature range, the alloy has excellent structural stability and unusually good fabricability. The primary application for alloy 520 is blading for aircraft and land-based gas turbines.

 

Typical Mechanical Properties

Table 3 – 1000-Hour Rupture Strength of Precipitation- Hardened UDIMET alloy 520

 

Temperature		Rupture Strength
°F	°C	ksi	MPa
1200	649	85	585
1300	704	69	475
1400	760	50	345
1500	816	33	230
1600	871	22	150

Physical Constants

Table 2 – Physical Constants

Density, lb/in³………………………………………………………… 0.297

g/cm³…………………………………………………………. 8.21

Melting Range, °F………………………………………….. 2300-2560

°C………………………………………….. 1260-1405

Carbon…………………………………………………………… 0.02-0.06

Chromium………………………………………………………. 18.0-20.0

Cobalt……………………………………………………………. 11.0-14.0

Molybdenum………………………………………………………. 5.5-7.0

Titanium………………………………………………………….. 2.9-3.25

Aluminum………………………………………………………….. 1.8-2.3

Tungsten…………………………………………………………… 0.8-1.2

Boron…………………………………………………………. 0.004-0.010

Nickel……………………………………………………………… Balance*

 

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

 

Welding

Most applications for UDIMET alloy 520 do not require that the alloy be welded. However, should joining or rebuilding be required, gas tungsten-arc welding (GTAW) with INCONEL® filler metal 718, 725NDUR®, or 617 may be considered. Complete procedure qualification and testing is suggested as welding experience with the alloy is limited.

 

 

Available Products and Specifications

UDIMET alloy 520 is available as forging bar.

 

Major specifications: PDS 15125A1

 

 

Publication Number SMC-105 Copyright © Special Metals Corporation, 2004 (Sept 04)

 

UDIMET, INCONEL and

725NDUR are trademarks of the Special Metals Corporation group of companies.

 

Figure 1. Typical mechanical properties of precipitation-hardened UDIMET alloy 520