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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: Call for availability. Request quote on this grade.

 

  1. View Nitronic Machining Brochure
  2. Download FDA statement concerning the use of stainless steels as food contact surfaces of equipment. 154 KB PDF

 

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

Standard

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

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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