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