Fatigue strength model (stress range) Parameters: Stress Ratio = -1, Number of Cycles = 1e7cycles
233
–
353
MPa
AISI 314 Stainless Impact & fracture properties
Fracture toughness
121
–
228
MPa.m0.5
Toughness (G)
79
–
241
kJ/m2
AISI 314 Stainless Thermal properties
Melting point
1400
–
1450
°C
Maximum service temperature
755
–
787
°C
Minimum service temperature
-200
°C
Thermal conductivity
16
–
18
W/m.°C
Specific heat capacity
490
–
530
J/kg.°C
Thermal expansion coefficient
14
–
16
µstrain/°C
Thermal shock resistance
106
–
125
°C
Thermal distortion resistance
1.04
–
1.24
MW/m
Latent heat of fusion
260
–
285
kJ/kg
AISI 314 Stainless Electrical properties
Electrical resistivity
72
–
82
µohm.cm
Electrical conductivity
2.1
–
2.39
%IACS
Galvanic potential
-0.23
–
-0.15
V
AISI 314 Stainless Magnetic properties
Magnetic type
Non-magnetic
AISI 314 Stainless Optical, aesthetic and acoustic properties
Transparency
Opaque
Acoustic velocity
4970
–
5090
m/s
Mechanical loss coefficient (tan delta)
9.5e-4
–
0.0013
AISI 314 Stainless Processing properties
Metal casting
Unsuitable
Metal cold forming
Acceptable
Metal hot forming
Acceptable
Metal press forming
Acceptable
Metal deep drawing
Limited use
Machining speed
21.6 m/min
Weldability Notes: Preheating and post weld heat treatments are not required
Good
Weldability – MIG
Fair
Weldability – plasma
Fair
Weldability – SAW
Not recommended
Weldability – TIG
Fair
Brazeability
Good
Carbon equivalency
5.87 – 7.25
AISI 314 Stainless Durability
Water (fresh)
Excellent
Water (salt)
Excellent
Weak acids
Excellent
Strong acids
Acceptable
Weak alkalis
Excellent
Strong alkalis
Excellent
Organic solvents
Excellent
Oxidation at 500C
Excellent
UV radiation (sunlight)
Excellent
Galling resistance (adhesive wear) Notes: Aluminum bronze is the most suitable mating material to minimize galling.
Limited use
Flammability
Non-flammable
AISI 314 Stainless Corrosion resistance of metals
Pitting resistance equivalent number (PREN)
23 – 26
Pitting and crevice corrosion
Medium (20-30)
Stress corrosion cracking Note: Rated in chloride; Other susceptible environments: Hydrogen sulfide
Slightly susceptible
Intergranular (weld line) corrosion
Excellent
Inorganic acids
Moderate
Organic acids
Moderate
Alkalis
Moderate
Humidity / water
Excellent
Sea water
Moderate
Sour oil and gas
Moderate
AISI 314 Stainless Standards with similar compositions-Equivalent Grades
Canada: 314 to CSA G110.3
China: 1Cr25Ni20Si2 to GB 1221, 1Cr25Ni20Si2 to GB 4238
Germany: 1.4841 to DIN EN 10095, 1.4843 to DIN 17470, CrNi2520 to DIN 17470, X15CrNiSi25-20 to DIN EN 10095
Hungary: H10 to MSZ 4359
Italy: X16CrNiSi2520 to UNI 6901
Mexico: 314 to NMX-B-83
Poland: H25N20S2 to PN-H-86022
Romania: 15SiNiCr250 to STAS 11523, 15SNC250 to STAS 3583
Russia: 20KH23N18 to GOST 5632, 20KH25N19S2L to GOST 977, 20KH25N20S2 to GOST 5632, 34 to COMECON PC4-70
Spain: F.3310 to UNE 36017, X15CrNiSi25-20 to UNE 36017
UK: 314S25 to BS 1554, X15CrNiSi25-21 to BS EN 10088-1
USA: 314 to ASTM A473, 314 to SAE J467, 5522 to AMS 5522, 5652 to AMS 5652, 7490 to AMS 7490, S31400 to ASTM A276, S31400 to ASTM A314-97, S31400 to ASTM A580/A580M-98, S31400 to ASTM A959, UNS S31400
Tradenames: ALLEGHENY METAL 25-20 + SI, ALLEGHENY METAL 25-20B, CN20, DOMINIAL ZF 2, ETERNOS NI 20, HI 22, HIZUTIT 711, KRUPP 2782, RDN 300, SAARSTAHL 1.2782, SICROMAL 23-20, SODING ON25 20, U.S.S. 25-20 SI, UNILOY 314, WEINGARTNER EW 4841, WITHERM 48 L
