Stainless steel, duplex, UNS S32760, annealed

UNS S32760 Duplex Stainless Steel Designation

Wrought S-Steel: UNS S32760, annealed
Condition	Solution annealed
UNS number	S32760
EN name	X2CrNiMoCuWN 25-7-4
EN number	1.4501

UNS S32760 Duplex Stainless Steel Tradenames

Zeron 100

UNS S32760 Duplex Stainless Steel Composition detail

C (carbon)	0	–	0.03	%
Cr (chromium)	24	–	26	%
Cu (copper)	0.5	–	1	%
Fe (iron)	57.6	–	65.8	%
Mn (manganese)	0	–	1	%
Mo (molybdenum)	3	–	4	%
N (nitrogen)	0.2	–	0.3	%
Ni (nickel)	6	–	8	%
P (phosphorus)	0	–	0.03	%
S (sulfur)	0	–	0.01	%
Si (silicon)	0	–	1	%
W (tungsten)	0.5	–	1	%

UNS S32760 Duplex Stainless Steel Physical properties

Density

7.73

–

7.82

g/cm3

UNS S32760 Duplex Stainless Steel, Annealed, Mechanical properties

Young’s modulus	190	–	200	GPa
Specific stiffness	24.4	–	25.7	MN.m/kg
Yield strength (elastic limit)	515	–	565	MPa
Tensile strength	700	–	930	MPa
Specific strength	66.2	–	72.7	kN.m/kg
Elongation	23	–	27	% strain
Compressive strength	515	–	575	MPa
Flexural modulus	190	–	200	GPa
Flexural strength (modulus of rupture)	515	–	575	MPa
Shear modulus	74	–	81	GPa
Poisson’s ratio	0.315	–	0.325
Shape factor	42
Hardness – Vickers	281	–	291	HV
Hardness – Rockwell B	103	–	105	HRB
Hardness – Rockwell C	28			HRC
Hardness – Brinell	276	–	286	HB
Elastic stored energy (springs)	680	–	820	kJ/m3
Fatigue strength at 10^7 cycles	241	–	267	MPa
Fatigue strength model (stress range) Parameters: Stress Ratio = -1, Number of Cycles = 1e7cycles	194	–	332	MPa

UNS S32760 Duplex Stainless Steel, Annealed, Impact & fracture properties

Fracture toughness	150	–	195	MPa.m0.5
Toughness (G)	117	–	192	kJ/m2

UNS S32760 Duplex Stainless Steel, Annealed, Thermal properties

Melting point	1400	–	1450	°C
Maximum service temperature	335	–	365	°C
Minimum service temperature	-60	–	-50	°C
Thermal conductivity	12.9	–	15	W/m.°C
Specific heat capacity	482	–	500	J/kg.°C
Thermal expansion coefficient	12.8	–	13.8	µstrain/°C
Thermal shock resistance	195	–	222	°C
Thermal distortion resistance	0.963	–	1.14	MW/m
Latent heat of fusion	379	–	458	kJ/kg

UNS S32760 Duplex Stainless Steel, Annealed, Electrical properties

Electrical resistivity	80	–	85	µohm.cm
Electrical conductivity	2.03	–	2.16	%IACS
Galvanic potential	-0.24	–	-0.16	V

UNS S32760 Duplex Stainless Steel, Annealed, Magnetic properties

Magnetic type

Magnetic

UNS S32760 Duplex Stainless Steel, Annealed, Optical, aesthetic and acoustic properties

Transparency	Opaque
Acoustic velocity	4940	–	5070	m/s
Mechanical loss coefficient (tan delta)	6e-4	–	7.4e-4

UNS S32760 Duplex Stainless Steel, Annealed, Processing properties

Metal casting	Unsuitable
Metal cold forming	Limited use
Metal hot forming	Limited use
Metal press forming	Limited use
Metal deep drawing	Limited use
Machining speed	14.6 m/min
Weldability Notes: Preheating and post weld heat treatments are not required	Good
Weldability – MIG	Excellent
Weldability – plasma	Excellent
Weldability – SAW	Excellent
Weldability – TIG	Excellent
Brazeability	Fair
Carbon equivalency	1.12 – 1.4

UNS S32760 Duplex Stainless Steel, Annealed, 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 S32760 Duplex Stainless Steel, Annealed, Corrosion resistance of metals

Pitting resistance equivalent number (PREN)	37.9 – 45.7
Pitting and crevice corrosion	Very high (>40)
Stress corrosion cracking Note: Rated in chloride; Other susceptible environments: Hydrogen sulfide	Slightly susceptible
Intergranular (weld line) corrosion	Excellent
Inorganic acids	Good
Organic acids	Good
Alkalis	Good
Humidity / water	Excellent
Sea water	Excellent
Sour oil and gas	Good

UNS S32760 Duplex Stainless Steel Notes

This is a second generation of duplex.

UNS S32760 Duplex Stainless Steel Standards with similar compositions

International: X2CrNiMoCuWN25-7-4 to ISO 16143-1, X2CrNiMoCuWN25-7-4 to ISO 16143-2, X2CrNiMoCuWN25-7-4 to ISO 9328-7

UK: X2CrNiMoCuWN25-7-4 to BS EN 10088-1, X2CrNiMoCuWN25-7-4 to BS EN 10088-2, X2CrNiMoCuWN25-7-4 to BS EN 10088-3, X2CrNiMoCuWN25-7-4 to BS EN 10216-5, X2CrNiMoCuWN25-7-4 to BS EN 10272, X2CrNiMoCuWN25-7-4 to BS EN 10297-2

USA: F55 to ASTM A182/A182M, S32760 to ASTM A240/A240M, S32760 to ASTM A276, S32760 to ASTM A314-97, S32760 to ASTM A473, S32760 to ASTM A479/A479M, S32760 to ASTM A789/A789M, S32760 to ASTM A790/A790M, S32760 to ASTM A815/A815M, S32760 to ASTM A959, S32760 to ASTM A988/A988M-98, S32760 to SAE J405, UNS S32760

Tradenames: BÖHLER A911SA EXTRA, NAS 75N, ZERON 100