Super Alloy Nitronic 33™ ( UNS S24000)

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Fabrication and Heat Treatment
     Annealing
     Welding
     Forging
     Forming
     Machinability
     Hardening
Applications

Introduction

Super alloys or high performance alloys include iron-based, cobalt-based and nickel-based alloys. These alloys can be strengthened by precipitation hardening, solid-solution hardening and work hardening methods. Super alloys can function under high mechanical stress and high temperatures and also in places that require high surface stability. Super alloys are of different shapes and possess good oxidation and creep resistance.

Nitronic 33™ has high yield strength along with ductility and toughness. This nitrogen-strengthened austenitic stainless steel is designed specifically with strong cryogenic properties, low magnetic permeability and high yield strength.

The following datasheet provides an overview of Nitronic 33™.

Chemical Composition

The chemical composition of Nitronic 33™ is outlined in the following table.

Element Content (%)
Chromium, Cr 17.00 min.–19.00 max.
Manganese, Mn 11.50 min.–14.50 max.
Nickel, Ni 2.25 min.–3.75 max.
Silicon, Si 0.75
Nitrogen, N 0.20 min.–0.40 max.
Phosphorus, P 0.06
Sulfur, S 0.03
Carbon, C 0.08

Physical Properties

The following table shows the physical properties of Nitronic 33™.

Properties Metric Imperial
Density 7.775 g/cm3 0.2808 lb/in³

Mechanical Properties

The mechanical properties of Nitronic 33™ are displayed in the following table.

Properties Metric Imperial
Tensile strength 0.689 GPa 100 ksi
Yield strength 0.379 GPa 55 ksi
Elongation at break (in 2 in.) 40% 40%
Hardness, Brinell 241 241
Hardness, Rockwell B 100 100

Thermal Properties

The thermal properties of Nitronic 33™ are given in the following table.

Properties Metric Imperial
Thermal expansion co-efficient (@78-200°F/26-93°C) 16.074 µm/m°C 8.93 µin/in°F

Other Designations

Equivalent materials to Nitronic 33™ are provided in the table below.

ASTMA240(XM-29) ASTMA249(XM-29) ASTMA269(XM-29) ASTMA479(XM-29)
ASTMA276 ASTMA312(XM-29) ASTMA412(XM-29) ASTMA580(XM-29)
ASTMA688(XM-29) ASTMA813(TPXM-29) ASTMA814(TPXM-29)  

Fabrication and Heat Treatment

Annealing

Nitronic 33™ is soaked at 1038-1121°C (1900-2050°F) and then rapidly quenched in water or air

Welding

Common welding techniques are used for Nitronic 33™ such as submerged arc welding, gas metal arch welding, and gas tungsten arc welding.

Forging

Nitronic 33™ is heated to 1093°C (2000°F) and then soaked to equalize. The alloy is again heated to 1177°C (2150°F) and equalized before being forged.

Forming

Nitronic 33™ can be formed by the commonly used forming methods. For instant annealing, this alloy is heated to 1065°C (1950°F). The stress that is formed due to the high hardening rate is removed by a process annealing method.

Machinability

Nitronic 33™ can be machined by commonly used machining methods, and usage of resulphurized lubricant, positive feeds and slow speeds are recommended for the machining process of this alloy. Breakers or curlers can also be used as the chips might be stringy or tough.

Hardening

Nitronic 33™ can be hardened when cold worked. It cannot be hardened under thermal treatment.

Applications

Nitronic 33™ include the following applications:

  • Tube assemblies
  • Pipes
  • Cable
  • Valves
  • Tanks
  • Containment rings
  • Fans

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