AISI 303 Stainless Steel Material Data Sheet (Free Machining, Annealed)

Stainless steel, austenitic, AISI 303, annealed

AISI 303 Stainless Steel General information (Free Machining, Annealed)

Designation
AISI 303, BS303S31, wrought
Condition	Solution annealed
UNS number	S30300
US name	AISI 303
EN name	X8CrNiS18-9
EN number	1.4305

AISI 303 Stainless Steel Composition (Free Machining, Annealed)

C (carbon)	0	–	0.15	%
Cr (chromium)	17	–	19	%
Fe (iron)	66.7	–	74.8	%
Mn (manganese)	0	–	2	%
Mo (molybdenum)	0	–	0.6	%
Ni (nickel)	8	–	10	%
P (phosphorus)	0	–	0.2	%
S (sulfur)	0.15	–	0.35	%
Si (silicon)	0	–	1	%

AISI 303 Stainless Steel Physical properties (Free Machining, Annealed)

Density

7.9

–

8.04

g/cm^3

AISI 303 Stainless Steel Mechanical properties (Free Machining, Annealed)

Young’s modulus	192	–	200	GPa
Specific stiffness	24.1	–	25.1	MN.m/kg
Yield strength (elastic limit)	204	–	280	MPa
Tensile strength	528	–	639	MPa
Specific strength	25.5	–	35.1	kN.m/kg
Elongation	35	–	55	% strain
Compressive strength	151	–	208	MPa
Flexural modulus	192	–	200	GPa
Flexural strength (modulus of rupture)	204	–	280	MPa
Shear modulus	77.2			GPa
Poisson’s ratio	0.25	–	0.287
Shape factor	63
Hardness – Vickers	156	–	226	HV
Hardness – Rockwell B	81	–	96	HRB
Hardness – Rockwell C	0	–	17	HRC
Hardness – Brinell	153	–	177	HB
Elastic stored energy (springs)	1.21e3	–	1.63e3	kJ/m^3
Fatigue strength at 10^7 cycles	229	–	296	MPa
Fatigue strength model (stress range) Parameters: Stress Ratio = -1, Number of Cycles = 1e7cycles	206	–	328	MPa

AISI 303 Stainless Steel Impact & fracture properties (Free Machining, Annealed)

Fracture toughness	70	–	120	MPa.m^0.5
Toughness (G)	26.5	–	69.4	kJ/m²

AISI 303 Stainless Steel Thermal properties (Free Machining, Annealed)

Melting point	1390	–	1440	°C
Maximum service temperature	750	–	925	°C
Minimum service temperature	-200			°C
Thermal conductivity	15.8	–	16.5	W/m.°C
Specific heat capacity	476	–	511	J/kg.°C
Thermal expansion coefficient	16.2	–	17.9	µstrain/°C
Thermal shock resistance	60.5	–	84.4	°C
Thermal distortion resistance	0.9	–	1	MW/m
Latent heat of fusion	378	–	458	kJ/kg

AISI 303 Stainless Steel Electrical properties ( Free Machining, Annealed)

Electrical resistivity	71.8	–	72.5	µohm.cm
Electrical conductivity	2.38	–	2.4	%IACS
Galvanic potential	-0.17	–	-0.09	V

AISI 303 Stainless Steel Magnetic properties ( Free Machining, Annealed)

Magnetic type

Non-magnetic

AISI 303 Stainless Steel Optical, aesthetic and acoustic properties (Free Machining, Annealed)

Transparency	Opaque
Acoustic velocity	4910	–	5010	m/s
Mechanical loss coefficient (tan delta)	9.5e-4	–	0.0013

AISI 303 Stainless Steel Processing properties (Free Machining, Annealed)

Metal casting	Unsuitable
Metal cold forming	Limited use
Metal hot forming	Limited use
Metal press forming	Limited use
Metal deep drawing	Unsuitable
Machining speed	33.5 m/min
Weldability Notes: Preheating and post weld heat treatments may be required	Poor
Weldability – MIG	Not recommended
Weldability – plasma	Not recommended
Weldability – SAW	Not recommended
Weldability – TIG	Not recommended
Brazeability	Fair
Carbon equivalency	0.7 – 1.09

AISI 303 Stainless Steel Durability (Free Machining, Annealed)

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)	Limited use
Flammability	Non-flammable

AISI 303 Stainless Steel Corrosion resistance (Free Machining, Annealed)

Pitting resistance equivalent number (PREN)	17- 21
Pitting and crevice corrosion	Low (<20)
Stress corrosion cracking Note: Rated in chloride; Other susceptible environments: Hydrogen sulfide	Slightly susceptible
Intergranular (weld line) corrosion	Restricted
Inorganic acids	Moderate
Organic acids	Moderate
Alkalis	Moderate
Humidity / water	Excellent
Sea water	Restricted
Sour oil and gas	Poor

AISI 303 Stainless Steel Standards with similar compositions-Equivalent Grades (Free Machining, Annealed)

Australia: 303 to AS 2837

China: Y1Cr18Ni9 to GB 1220, Y1Cr18Ni9 to GB 4226, Y1Cr18Ni9 to GB/T 4356, Y1Cr18Ni9(-Q) to GB/T 4240, Y1Cr18Ni9(-R) to GB/T 4240

Hungary: KO36S to MSZ 4360, X12CrNiS189 to MSZ 4360

Italy: X10CrNiS1809 to UNI 6901

Japan: SUS303 to JIS G4303, SUS303 to JIS G4304, SUS303 to JIS G4308, SUS303 to JIS G4309

Russia: N to GOST 30208

South Korea: STS 303 to KS D 3706, STS 303-W1 to KS D 3703, STS303 to KS D 3702

Spain: E-303 to UNE 36016/1, F.3508 to UNE 36016, F.3508 to UNE 36016/1, X10CrNiS18-09 to UNE 36016

Sweden: 2346 to SS 142346

UK: 303S22 to BS 1506, 303S31 to BS 1554, 303S31 to BS 6258, 303S31 to BS 970/1

USA: 303 to ASTM A473, 303 to MIL-S-862B, 5640 to AMS 5640, S30300 to ASTM F593, S30300 to ASTM F594, S30300 to ASTM F738M, S30300 to ASTM F836M, S30300 to ASTM F837/F837M, S30300 to ASTM F880/F880M, UNS S30300, UNS S30360

Tradenames: ARGESTE 4305 UA/UB/US, AU188Z, CRUCIBLE 303 PLUS, OUTOKUMPU 303 HST®, SLATER TYPE 303 FORGING QUALITY, SLATER TYPE 303 MAX MACHINABILITY, U.S.S. 18-8 F.M.