Nitronic 40

NITRONIC® 40
UNS S21900 / S21904

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Cr 21 Ni 6 Mn 9 (21-6-9)

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Overview

Nitronic 40 is a high-manganese stainless steel with high strength and excellent resistance to corrosion at high temperatures. Nitronic 40® can be fabricated and readily weldable. Nitronic 40® has been used for chemical processing, pollution control equipment and various aircraft engine components.

Applications

  • Aircraft components

Chemical Requirements

Ni

Cr

Mn

C

Si

N

S

Max

7.50

21.50

10.0

0.08

1.00

0.40

0.030

Min

5.50

19.00

8.0

0.15


Mechanical Property Requirements

Ultimate Tensile, min.

Yield Strength (0.2% OS) min.

Elong.in 2 in., or 50mm, min., %

R/A

Hardness, max.

Min

95 KSi

48 KSi

35

 

Max

241 Brinell

Min

655 MPa

330 MPa

Max

100 Rockwell B


Specifications


UNS S21900 XM-10 21-6-9

AMS 5656 ASTM A276 / A479 / A314

ASTM A580

AMS 5595 / ASTM A412

AMS 5595 / ASTM A412

ASTM A412

 

AMS 5561 / AMS 5562

ASTM A314

 

 

 

Bar Sizes

1/4 CG
5/16 CG
3/8 CG
7/16 CG
1/2 CG
9/16 CG
5/8 CG
11/16 CG
3/4 CG
13/16 CG
7/8 CG
15/16 CG
1 CG
1-1/8 CG
1-3/16 CG
1-1/4 CG
1-5/16 CG
1-3/8 CG
1-1/2 CG
1-5/8 CG
1-3/4 CG
1-7/8 CG
2 CG
2-1/4 CG
2-1/2 CG
3 CG
3-1/2 CG
4 RT
4-1/2 RT
5 RT
6 RT
8 RT

Machining

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.

NITRONIC® is a registered trademark of AK Steel

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