Super Alloy 22Cr-13Ni-5Mn™ (UNS S20910)

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.

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