Stainless steel, duplex, ASTM CD-4MCu, cast, water quenched

ASTM CD-4MCu Designation

ASTM CD-4MCu
Condition	Solution annealed; water quenched
UNS number	J93370
US name	ASTM CD-4MCu

ASTM CD-4MCu Typical uses

Chemicals industry, marine, water supply, power plant, pulp & paper manufacture, soap manufacture, textiles, transportation

ASTM CD-4MCu Composition detail

C (carbon)	0	–	0.04	%
Cr (chromium)	24.5	–	26.5	%
Cu (copper)	2.75	–	3.25	%
Fe (iron)	59.9	–	66.2	%
Mn (manganese)	0	–	1	%
Mo (molybdenum)	1.75	–	2.25	%
Ni (nickel)	4.75	–	6	%
P (phosphorus)	0	–	0.04	%
S (sulfur)	0	–	0.04	%
Si (silicon)	0	–	1	%

ASTM CD-4MCu Physical properties

Density

7.7

–

7.8

g/cm3

ASTM CD-4MCu Mechanical properties

Young’s modulus	195	–	205	GPa
Specific stiffness	25.1	–	26.5	MN.m/kg
Yield strength (elastic limit)	505	–	620	MPa
Tensile strength	670	–	820	MPa
Specific strength	65.2	–	80	kN.m/kg
Elongation	30	–	40	% strain
Compressive strength	505	–	620	MPa
Flexural modulus	195	–	205	GPa
Flexural strength (modulus of rupture)	505	–	620	MPa
Shear modulus	75	–	82	GPa
Bulk modulus	138	–	159	GPa
Poisson’s ratio	0.265	–	0.285
Shape factor	42
Hardness – Vickers	245	–	270	HV
Hardness – Rockwell C	21	–	26	HRC
Hardness – Brinell	228	–	258	HB
Elastic stored energy (springs)	643	–	953	kJ/m3
Fatigue strength at 10^7 cycles	323	–	373	MPa
Fatigue strength model (stress range) Parameters: Stress Ratio = -1, Number of Cycles = 1e7cycles	282	–	427	MPa

ASTM CD-4MCu Impact & fracture properties

Fracture toughness	51	–	112	MPa.m0.5
Toughness (G)	14.5	–	56.1	kJ/m2

ASTM CD-4MCu Thermal properties

Melting point	1460	–	1500	°C
Maximum service temperature	746	–	770	°C
Minimum service temperature	-23	–	-3	°C
Thermal conductivity	15	–	16	W/m.°C
Specific heat capacity	450	–	470	J/kg.°C
Thermal expansion coefficient	10	–	12	µstrain/°C
Thermal shock resistance	223	–	293	°C
Thermal distortion resistance	1.28	–	1.56	MW/m
Latent heat of fusion	260	–	285	kJ/kg

ASTM CD-4MCu Electrical properties

Electrical resistivity	70	–	80	µohm.cm
Electrical conductivity	2.16	–	2.46	%IACS
Galvanic potential	-0.24	–	-0.16	V

ASTM CD-4MCu Magnetic properties

Magnetic type

Magnetic

ASTM CD-4MCu Optical, aesthetic and acoustic properties

Transparency	Opaque
Acoustic velocity	5010	–	5150	m/s
Mechanical loss coefficient (tan delta)	5.8e-4	–	7.3e-4

ASTM CD-4MCu Processing properties

Metal casting	Limited use
Metal cold forming	Unsuitable
Metal hot forming	Unsuitable
Metal press forming	Unsuitable
Metal deep drawing	Unsuitable
Machining speed	17.4 m/min
Weldability Notes: Preheating and post weld heat treatments are not required	Good
Carbon equivalency	1.1 – 1.35

ASTM CD-4MCu Durability

Water (fresh)	Excellent
Water (salt)	Excellent
Weak acids	Excellent
Strong acids	Acceptable
Weak alkalis	Excellent
Strong alkalis	Limited use
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

ASTM CD-4MCu Corrosion resistance of metals

Pitting resistance equivalent number (PREN)	30.3 – 33.9
Pitting and crevice corrosion	High (30-40)
Stress corrosion cracking Note: Rated in chloride; Other susceptible environments: Hydrogen sulfide	Susceptible

ASTM CD-4MCu Warning

Must be used in the solution annealed condition.

ASTM CD-4MCu Standards with similar compositions

China: ZG03Cr26Ni5Cu3Mo3N to GB/T 2100

India: Grade 16 to IS 7806

South Korea: CD4MCu to KS D 3747

USA: 1A to ASTM A890/A890M-99, CD4MCu to ASTM A351/A351M, UNS J93370

Tradenames: LEBANON CD4MCU, TUF-WEAR 30, URANUS 55 M, WAUKESHA NO. 35