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Posted 01/09/2020 in Materials

Why use Nitronic 32 Stainless Steel?


Why use Nitronic 32 Stainless Steel?

Introduction

Nitronic® 32 is a high strength, low nickel austenitic stainless steel that is part of a group of materials known as Nitronic® due to the addition of nitrogen to improve their strength. This group includes Nitronic® 30Nitronic® 33Nitronic® 40Nitronic® 50 and Nitronic® 60.

Nitronic® 32 is a trademark of the AK Steel Corporation. 

It is used for a number of industrial applications. 


Other Material Designations

  • UNS S24100
  • XM 28


Product Standards and Specifications

  • ASTM A240 Plate, Sheet and Strip for Pressure Vessels.
  • ASTM A666 Austenitic Stainless Steel Sheet, Strip, Plate and Flat Bar.

ASTM - American Society for Testing and Materials


Available Forms

  • Ingot, forging billet, bar and plate.


What conditions is it ideal for?

Nitronic 32 is useful in corrosive environments as its general corrosion resistance is similar to that of 304 stainless steel.

The opportunities for use are furthered by a yield strength that is around double that of 304 stainless steel at room temperature due to the addition of nitrogen and its abrasion resistance.


Machinability

Nitronic 32 has a high work hardening rate, so although it’s machinability characteristics are similar to that of other austenitic stainless steels, the material will have to be held more rigidly and slower speeds used. 

More power will also be required, so heavy machines will be required, and it is also recommended to use carbide coated tooling.

 

Machining Data

Carbide tools are suggested for rates better than 50% of Type 304.

Machining Type

Suggested starting rates are:

Single Point Turning 

Roughing - 0.15" depth, 0.015"/rev feed -175 SFM

Finishing - 0.025" depth, 0.007"/rev feed - 200 SFM

Drilling 

1/4" Dia hole - 0.004"/rev feed - 60 SFM

1/2" Dia hole - 0.007"/rev feed - 60 SFM

3/4" Dia hole - 0.010"/rev feed - 60 SFM

Reaming 

Feed - same as drilling - 100 SFM

Side and Slot Milling 

Roughing - 0.25" depth - 0.007"/tooth feed - 125SFM

Finishing - 0.050" depth - 0.009"/tooth feed - 140SFM

These rates are for carbide tools,

Type C-2 for roughing, drilling and reaming.

Type C-3 for finishing.

 


Weldability

Nitronic 32 can be welded using all the most common welding techniques. Its weldability is similar to that of 304 stainless steel and no pre-heating is required.

To avoid a reduction in strength or resistance to intergranular attack, a filler with similar chemistry to the base material should be used.


Heat Treatment

Nitronic 32 cannot be hardened by using heat treatment.


Stress-Corrosion Cracking and Intergranular Attack Resistance

Similar to the majority of stainless steels, Nitronic 32 may stress-corrosion crack in hot chloride environments but maintains high resistance in marine environments at ambient temperatures.

The ability of Nitronic 32 to resist intergranular attack is excellent, however the correct filler has to be used in weldment's to maintain this level throughout the component.

Also, due to its higher carbon content, resistance to intergranular attack in an aggressive media is not as good  as 304 stainless steel.


Examples of where is it used:

The properties of Nitronic 32 make it useful for a number of used.

It is often used for the following:

  • Fasteners
  • Shafting
  • Racks and cages
  • Well screens
  • Screens for the coal industry
  • Screens for the food processing industry
  • Communication Hardware
  • Concrete reinforcing accessories
  • High strength non-magnetic springs

 

Summary of Advantages:

  • Corrosion resistant, with a similar level to that of 304 stainless steel.
  • High strength, yield of almost twice that of 304 stainless steel.
  • Abrasion resistant.

 

Nitronic 32 Properties

Chemical Composition

Typical chemical composition of Nitronic® 32 is detailed in the table below.

ElementContent (%)
Chromium, Cr16.5 - 19.5
Nickel, Ni0.5 - 2.5
Manganese, Mn11 - 14
Silicon, Si1
Nitrogen, N0.2 - 0.45
Carbon, C0.15
Sulfur, S0.03
Phosphorus, P
0.06
Iron, FeRemainder

Physical Properties

Typical physical properties of Nitronic® 32 are detailed in the table below. 

PropertiesMetricImperial
Density7.83 g/cm30.283 lb/in3
Melting Point
1450-1510 °C2642-2750 °F

Mechanical Properties

Typical mechanical properties of Nitronic® 32 are detailed in the table below.

PropertiesMetricImperial
Tensile strength at break 690 MPa100000 psi
Yield strength379 MPa55000 psi
Elongation at break30%30%
Hardness, Rockwell B9292

 

Discover Nitronic® 32 through All About Precision

As we have seen, Nitronic® 32 is a very versatile material that can be used in many situations. 

If you’re looking for Nitronic® 32 or parts Manufactured from Nitronic® 32 in the United Kingdom, go through All About Precision. 

We make finding the best engineering specialist for your needs easy! You can compare quotes, browse reviews, and more from our website.


References

http://www.electralloy.com/images/pdf/Product_Sheets/Electralloy/Nitronic_32.pdf

https://www.refractorymetal.org/nitronic-32/

https://www.ulbrichshapedwire.com/materials/nitronic-32-stainless-steel-uns-s24100/

https://www.metalsuppliersonline.com/propertypages/nitronic32.asp


The technical advice and recommendations made in this article should not be relied or acted upon without conducting your own further investigations, including corrosion exposure tests where needed. Please consult current editions of standards for design properties. All About Precision assumes no liability in connection with the information in this article.