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  • 800-HPALLOY
  • 1985 E 500 N Windfall, IN 46076
    444 Wilson St Tipton, IN 46072
    Post Office Box 40 Tipton, IN 46072
    tel:8004725569

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 Strengtd (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

Size

Finish

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