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NITRONIC® 40 (S21900 / S21904) Cr 21 Ni 6 Mn 9 (21-6-9)

High Performance Alloys stocks and produces this grade in the following forms: Bar, sheet and plate. Request quote on this grade.

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

Chemistry

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

Tensile Data

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

Form

Standard

Metal Type

UNS S21900 XM-10 21-6-9

Bar

AMS 5656 ASTM A276 / A479 / A314

Flat Bar

Wire

ASTM A580

Sheet

AMS 5595 / ASTM A412

Plate
AMS 5595 / ASTM A412

Foil

ASTM A412

Fitting

 

Tube
AMS 5561 / AMS 5562

Forging

ASTM A314

Weld Wire

 

Weld Electrode
 

Din

 

 

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

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.

 

NITRONIC® is a registered trademark of AK Steel

 
 
   
 
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