Stainless steel, duplex, UNS S32003 (AL 2003), annealed

UNS S32003 (AL 2003) Duplex Stainless Steel Designation

Wrought S-Steel: UNS S32003
Condition	Solution annealed; water quenched
UNS number	S32003

UNS S32003 (AL 2003) Duplex Stainless Steel Composition detail

C (carbon)	0	–	0.03	%
Cr (chromium)	19.5	–	22.5	%
Fe (iron)	68.2	–	75.9	%
Mn (manganese)	0	–	2	%
Mo (molybdenum)	1.5	–	2	%
N (nitrogen)	0.14	–	0.2	%
Ni (nickel)	3	–	4	%
P (phosphorus)	0	–	0.03	%
S (sulfur)	0	–	0.02	%
Si (silicon)	0	–	1	%

UNS S32003 (AL 2003) Duplex Stainless Steel Physical properties

Density

7.69

–

7.76

g/cm3

UNS S32003 (AL 2003), annealed, Duplex Stainless Steel Mechanical properties

Young’s modulus	190	–	210	GPa
Specific stiffness	24.6	–	27.2	MN.m/kg
Yield strength (elastic limit)	515	–	550	MPa
Tensile strength	725	–	760	MPa
Specific strength	66.7	–	71.2	kN.m/kg
Elongation	31.5	–	36.5	% strain
Compressive strength	515	–	550	MPa
Flexural modulus	190	–	210	GPa
Flexural strength (modulus of rupture)	515	–	550	MPa
Shear modulus	75	–	85	GPa
Poisson’s ratio	0.295	–	0.305
Shape factor	44
Hardness – Vickers	234	–	243	HV
Hardness – Rockwell B	97	–	98	HRB
Hardness – Rockwell C	19	–	21	HRC
Hardness – Brinell	218	–	228	HB
Elastic stored energy (springs)	654	–	769	kJ/m3
Fatigue strength at 10^7 cycles	330	–	380	MPa
Fatigue strength model (stress range) Parameters: Stress Ratio = -1, Number of Cycles = 1e7cycles	325	–	386	MPa

UNS S32003 (AL 2003), annealed, Duplex Stainless Steel Impact & fracture properties

Fracture toughness	150	–	195	MPa.m0.5
Toughness (G)	114	–	188	kJ/m2

UNS S32003 (AL 2003), annealed, Duplex Stainless Steel Thermal properties

Melting point	1400	–	1450	°C
Maximum service temperature	335	–	365	°C
Minimum service temperature	-60	–	-50	°C
Thermal conductivity	16.3	–	17.7	W/m.°C
Specific heat capacity	500	–	520	J/kg.°C
Thermal expansion coefficient	12.7	–	13.3	µstrain/°C
Thermal shock resistance	192	–	218	°C
Thermal distortion resistance	1.25	–	1.37	MW/m
Latent heat of fusion	394	–	476	kJ/kg

UNS S32003 (AL 2003), annealed, Duplex Stainless Steel Electrical properties

Electrical resistivity	78.4	–	81.6	µohm.cm
Electrical conductivity	2.11	–	2.2	%IACS
Galvanic potential	-0.27	–	-0.19	V

UNS S32003 (AL 2003), annealed, Duplex Stainless Steel Magnetic properties

Magnetic type

Magnetic

UNS S32003 (AL 2003), annealed, Duplex Stainless Steel Optical, aesthetic and acoustic properties

Transparency	Opaque
Acoustic velocity	4960	–	5220	m/s
Mechanical loss coefficient (tan delta)	6e-4	–	7.4e-4

UNS S32003 (AL 2003), annealed, Duplex Stainless Steel Processing properties

Metal casting	Unsuitable
Metal cold forming	Limited use
Metal hot forming	Acceptable
Metal press forming	Limited use
Metal deep drawing	Limited use
Machining speed	18.9 m/min
Weldability Notes: Preheating and post weld heat treatments are not required	Good
Weldability – MIG	Good
Weldability – plasma	Good
Weldability – SAW	Good
Weldability – TIG	Good
Brazeability	Fair
Carbon equivalency	0.8 – 1.08

UNS S32003 (AL 2003), annealed, Duplex Stainless Steel 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

UNS S32003 (AL 2003), annealed, Duplex Stainless Steel Corrosion resistance

Pitting resistance equivalent number (PREN)	26.7 – 32.3
Pitting and crevice corrosion	High (30-40)
Stress corrosion cracking Note: Rated in chloride; Other susceptible environments: Hydrogen sulfide	Susceptible
Intergranular (weld line) corrosion	Excellent
Inorganic acids	Good
Organic acids	Good
Alkalis	Moderate
Humidity / water	Excellent
Sea water	Good
Sour oil and gas	Good

UNS S32003 (AL 2003) Duplex Stainless Steel Standards with similar compositions

USA: 2003 to ASTM A270, S32003 to ASTM A240/A240M, S32003 to ASTM A789/A789M, S32003 to ASTM A790/A790M, S32003 to ASTM A959, UNS S32003