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Alloy 254

254 SMO

Alloys 254 / 254 SMO / 6 Mo is an austenitic stainless steel with a high molybdenum content. Coupled with Nickel and Copper this gives the alloy a good resistance to pitting and crevice corrosion, especially in environments containing halide ions, e.g. chloride, bromide and fluoride solutions.

254 SMO (UNS S31254) may offer a cost effective solution to Nickel and Titanium alloys in these environments.

Alloy	Common Name	Related Specifications			Tensile Strength	Proof Stress	Elongation
Alloy	Common Name	British	European	United States	Tensile Strength	Proof Stress	Elongation
Alloy 254	254SMO		1.4547	ASTM A479/A473, /A240 S31254 F44	655 [95]	305 [44.2]	35

Alloy 254 Technical Information

Alloy 254 Bar stock sizes available
Diameter (in)	Diameter (mm)	kg per m
3/8	9.53	0.57
1/2	12.70	1.01
5/8	15.88	1.58
3/4	19.05	2.28
7/8	22.23	3.10
1	25.40	4.05
1 1/4	31.75	6.33
1?	31.75	6.33
1 1/2	34.93	7.66
1 3/4	44.45	12.41
2	50.80	16.21
2.36	60	22.62
2.56	65	26.55
2.76	70	30.79
2.95	75	35.34
3.15	85	40.21
3.54	90	50.89
3.94	100	62.83
4.33	110	76.03
4.72	120	90.48
5.12	130	106.19
6.10	155	150.95

Specifications of Alloy 254

Alloy 254 to MLA-MPS-254-BAR
ASTM A479 Bar UNS S31254
ASTM A276 Bar UNS S31254
ASTM A182 Forgings UNS S31254 F44
ASTM A240 Plate S31254

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Alloy 254 Bar Purchase Specification

Chemical Specification of Alloy 254

Basic Properties of Alloy 254- Mechanical Properties

Physical Properties of Alloy 254

Applications of Alloy 254

Alloy 254 Features

Forms of Alloy 254 Available

Machining Advice of Alloy 254 - Hot worked and precipitation hardened

Alloy Comparisons

KEY Features of Alloy 254

Disclaimer
Data in this Alloy 254 page is provided solely for the purposes of distribution of information. Langley Alloys cannot make guarantees with respect to subject matter or accuracy of this information. Langley Alloys specifically disclaims all guarantees, expressed, implied or otherwise, including without limitation, all warranties of merchantability and fitness for a particular purpose. This publication may include technical inaccuracies or typographical errors. If errors are found, please make a notification via e-mail to: info@langleyalloys.com

Elements	C	Cr	Fe	Mo	Mn	N	Ni	Nb	P	S	Si	V
Minimum		20.5	REMAINDER	1.5	4.0	0.2	11.5	0.1				0.1
Maximum	0.06	23.5	6.00	3.0	6.0	0.4	13.5	0.3	0.45	0.3	1.0	0.3

0.2% Proof Stress (N/mm² )[ksi] minimum	300 [43.5]
Ultimate Tensile Strength (N/mm²) [ksi] minimum	650[94.2]
Elongation (%) minimum	35
Hardness (HBN)	270 max
Reduction of Area(%) minimum	50

Density (Kg.m^-3)	8000
Magnetic Permeability	<1.05
Young’s Modulus (N/mm²)	200 x 10³
Specific Heat 20°C (J.Kg-1.°K-1)	500
Electrical resistance, 20°C (µ.O.m)	0.85
Thermal conductivity, 20°C (W.m^-1.°K^-1)	13.5

Alloys	Bars & Sections	Hot & Cold Rolled Plate	Ingot & Billet	Forged Products	Sand Castings
FERMONIC 50
FERMONIC 50HS
ALLOY 254
ALLOY 316L

Operation	Cutting Speed m/min (ft/min)	Feed Rate mm/rev (in/rev)	Depth of cut mm (in)
Milling	18 (58)	0.13-0.25 mm/tooth 0.005-0.010 in/tooth	0.2-3.0 (0.007-0.12)
Drilling 6.4mm(1/4") dia	250rpm	0.075(0.003)
Drilling 12.7mm(1/2") dia	250 rpm	0.125(0.005)
Drilling 25.4mm(1") dia	150 rpm	0.28(0.011)
Turning - Roughing	30 - 45 ( 100 - 150 )	0.4-0.5 (0.015-0.020)	2.5 (0.1)
Turning - Finishing	50 - 60 ( 165 - 200 )	0.13-0.20 (0.005-0.008)	0.5 (0.02)
Tooling	Milling/Turning: Carbide (SANDVIK GC 235, SECO T25M) Drilling: HSS, point angle 118°, chisel angle 120°

Alloy Comparisons	S20910	S32205	N05500	S31254	FERRALIUM 255-SD50
(0.2% Proof Strength, N/mm²)	420	510	690	325	610
Corrosion Rate (mm.y-1)Seawater	<0.01	<0.01	<0.18	<0.01	<0.01
Corrosion Rate (mm.y-1)10% sulphuric acid at 80°C	0.7	0.4	0.1	<0.15	<0.15
Corrosion Rate (mm.y-1) Boiling 50% nitric acid	0.18	<0.15	0.15	<0.15	<0.15
Wear Properties related to Hardness (HRC)	RC27	RC25	RC20	RC27	RC27