Nov 14 2012
Topics Covered
Introduction
Chemical Composition
Physical Properties
Other Designations
Fabrication and Heat Treatment
Annealing
Welding
Forging
Forming
Machinability
Hardening
Applications
Introduction
Super alloys also known as high performance alloys are
available in a variety of shapes. These alloys are of three types that
include iron-based, cobalt-based and nickel-based alloys. The
nickel-based and cobalt-based super alloys are available as cast or
wrought alloys based on composition and application.
Super alloys contain elements in different combinations to
obtain a specific result. They have good oxidation and creep resistance
and can be strengthened by precipitation hardening, solid-solution
hardening and work hardening methods. They can also function under high
mechanical stress and high temperatures and also in places that require
high surface stability.
Super alloy 22Cr-13Ni-5Mn™ is described as an austenitic alloy
steel that is high is nitrogen content. This alloy continues to remain
magnetic even after strong forming operations and can be readily
fabricated.
The following datasheet provides an overview of super alloy
22Cr-13Ni-5Mn™.
Chemical Composition
The chemical composition of super alloy 22Cr-13Ni-5Mn™ is
outlined in the following table.
| Element |
Content
(%) |
| Iron, Fe |
Remainder |
| Chromium, Cr |
20.5-23.5 |
| Nickel, Ni |
11.5-13.5 |
| Manganese, Mn |
4-6 |
| Molybdenum, Mo |
1.5-3 |
| Silicon, Si |
1 max |
| Nitrogen, N |
0.2-0.4 |
| Vanadium, V |
0.1-0.3 |
| Niobium, Nb |
0.1-0.3 |
| Carbon, C |
0.06 max |
| Phosphorus, P |
0.04 max |
| Sulfur, S |
0.03 max |
Physical Properties
The following table shows the physical properties of super
alloy 22Cr-13Ni-5Mn™.
| Properties |
Metric |
Imperial |
| Density |
7.75 g/cm3 |
0.28 lb/in3 |
Other Designations
Equivalent materials to super alloy 22Cr-13Ni-5Mn™ are as
follows:
| ASTM A182 (XM-19) |
ASTM A193 (B8R, B8RA) |
ASTM A194 (B8R, B8RA) |
ASTM A276 |
ASTM A312 (XM-19) |
| ASTM A240 (XM-19) |
ASTM A249 (XM-19) |
ASTM A269 (XM-19) |
ASTM A336 (XM-19) |
ASTM A403 (XM-19) |
| ASTM A412 (XM-19) |
ASTM A479 (XM-19) |
ASTM A580 (XM-19) |
ASTM A813 (TP XM-19) |
DIN 1.3964 |
Fabrication and Heat
Treatment
Annealing
Super alloy 22Cr-13Ni-5Mn™ is soaked at 1038-1121°C
(1900-2050°F) followed by rapid water or air quenching.
Welding
Super alloy 22Cr-13Ni-5Mn™ can be welded with the commonly
used welding techniques including submerged arc welding, gas tungsten
arc welding and gas metal arc welding. To obtain resistance to
intergranular attack and maximum strength, a filler metal of similar
chemical composition should be used.
Forging
Super alloy 22Cr-13Ni-5Mn™ is heated to 1093°C (2000°F),
soaked to equalize and finally heated to 1177°C (2150°F) and equalized
before forging.
Forming
Super alloy 22Cr-13Ni-5Mn™ can be formed by the commonly used
forming methods. Process annealing helps remove the stress evolved due
to high work hardening rate of this alloy. For intermediate annealing
this alloy is heated to 1065°C (1950°F).
Machinability
Good machining results of super alloy 22Cr-13Ni-5Mn™ can be
obtained by ample resulfurized lubricant, slow speeds and positive
feeds. This alloy can be machined by all the commonly used machining
methods and feeds and speeds similar to those utilized for 317 or 316
stainless. Breakers or curlers can also be used as the chips could be
stringy or tough.
Hardening
Super alloy 22Cr-13Ni-5Mn™ cannot be hardened when exposed to
thermal treatment and thus requires to be cold worked in order to be
hardened.
Applications
Super alloy 22Cr-13Ni-5Mn™ is suitable for applications that
require corrosion resistance and high strength. Some of these
applications include valves, fasteners, pumps, marine hardware and boat
shafting.