HeatOnn Alloys

Duplex Stainless Steel

Duplex Stainless Steel
Sheets • Coils • Plates • Pipes • Rods

Duplex Stainless Steel is a family of stainless alloys containing roughly equal proportions of austenite and ferrite phases. This dual-phase microstructure provides a unique combination of high strength, excellent corrosion resistance, superior stress corrosion cracking resistance, and good weldability. Duplex grades are widely used in aggressive environments where both mechanical strength and corrosion resistance are critical.

Key Features

High tensile and yield strength (almost double that of austenitic stainless steels)
Excellent resistance to pitting, crevice corrosion, and stress corrosion cracking
Improved chloride corrosion resistance compared to 304/316 grades
Good weldability and formability
Lower thermal expansion and higher thermal conductivity
Cost-effective due to lower nickel and molybdenum content

Available Product Forms

Sheets
Coils
Plates
Pipes (Welded & Seamless)
Rods / Bars

Applications

Chemical processing equipment
Oil & gas offshore structures
Desalination plants
Pulp & paper industry
Heat exchangers and pressure vessels
Marine and shipbuilding components
Pollution control equipment
Food and pharmaceutical processing systems

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Key Features

Excellent combination of strength and corrosion resistance.
High resistance to stress corrosion cracking (SCC).
Improved weldability compared to other duplex grades.
Good resistance to pitting and crevice corrosion.
Higher mechanical strength than austenitic stainless steels.
Cost-effective due to lower nickel content.

Chemical Composition (% by weight)

Element	Composition (%)
Carbon (C)	≤ 0.04
Manganese (Mn)	≤ 2.0
Silicon (Si)	≤ 1.0
Chromium (Cr)	20.5 – 22.5
Nickel (Ni)	1.35 – 1.8
Molybdenum (Mo)	≤ 0.80
Nitrogen (N)	0.22 – 0.27
Phosphorus (P)	≤ 0.030
Sulfur (S)	≤ 0.015

Mechanical Properties

Property	Value
Tensile Strength	≥ 650 MPa
Yield Strength	≥ 450 MPa
Elongation	≥ 25%
Hardness	≤ 290 HBW

Physical Properties

Property	Value
Density	7.8 g/cm³
Melting Range	1420 – 1465°C
Thermal Conductivity	15 W/m·K
Electrical Resistivity	0.85 µΩ·m

Standard Sizes

Sheets & Plates

Thickness	Width	Length
0.5 mm – 50 mm	1000 mm – 2500 mm	1000 mm – 6000 mm

Coils

Thickness	Width
0.3 mm – 8 mm	600 mm – 2000 mm

Pipes

Type	Size Range
Seamless & Welded	½” – 24” NB

Rods

Diameter Range
6 mm – 300 mm

Applications

Annealing boxes and heat treatment equipment
Automotive exhaust systems
Steam turbine parts
Petrochemical processing units
Welded applications requiring low hardenability
Oil refinery components
General-purpose mechanical and structural parts

Key Features

Excellent corrosion resistance in chloride-rich and mildly acidic environments.
Higher strength than conventional austenitic stainless steels.
Good resistance to stress corrosion cracking (SCC).
Balanced microstructure of austenite and ferrite for enhanced performance.
High fatigue and impact strength.
Suitable for welding with minimal risk of intermetallic phase formation.

Chemical Composition (% by weight)

Element	Percentage (%)
Chromium (Cr)	20.0 – 22.0
Nickel (Ni)	1.0 – 4.0
Molybdenum (Mo)	0.1 – 0.8
Manganese (Mn)	≤ 5.0
Silicon (Si)	≤ 1.0
Carbon (C)	≤ 0.03
Phosphorus (P)	≤ 0.04
Sulfur (S)	≤ 0.02
Nitrogen (N)	0.15 – 0.25
Iron (Fe)	Balance

Mechanical Properties

Property	Value
Tensile Strength	700 – 900 MPa
Yield Strength (0.2% Proof)	≥ 450 MPa
Elongation	≥ 25%
Hardness	≤ 290 HB

Physical Properties

Property	Value
Density	7.8 g/cm³
Melting Range	1420 – 1460°C
Thermal Conductivity	~ 19 W/m·K
Electrical Resistivity	~ 0.80 µΩ·m
Modulus of Elasticity	200 GPa

Standard Sizes

Sheets & Plates

Thickness	Width	Length
0.5 mm – 50 mm	1000 / 1250 / 1500 mm	2000 – 6000 mm

Coils

Thickness	Width
0.3 mm – 6 mm	1000 / 1250 / 1500 mm

Pipes & Tubes

Type	Size Range
Seamless / Welded	OD 6 mm – 600 mm

Rods / Bars

Shape	Diameter / Size
Round	6 mm – 200 mm
Square / Hex	10 mm – 100 mm

Applications

Chemical processing equipment
Oil & gas offshore structures
Heat exchangers and condenser tubing
Desalination plants
Pump and valve components
Pulp & paper industry equipment
Structural components exposed to corrosive environments

Key Features

Balanced duplex microstructure offering high strength and moderate corrosion resistance.
Excellent resistance to stress corrosion cracking (SCC).
Good weldability and formability compared to conventional duplex grades.
High toughness and fatigue resistance.
Superior performance in chloride-rich and mildly corrosive environments.
Low thermal expansion and good thermal conductivity.

Chemical Composition (% by weight)

Element	Percentage (%)
Chromium (Cr)	20.0 – 22.0
Nickel (Ni)	1.0 – 4.0
Molybdenum (Mo)	0.3 – 1.0
Manganese (Mn)	≤ 2.5
Silicon (Si)	≤ 1.0
Carbon (C)	≤ 0.03
Phosphorus (P)	≤ 0.04
Sulfur (S)	≤ 0.03
Nitrogen (N)	0.15 – 0.25
Iron (Fe)	Balance

Mechanical Properties

Property	Value
Tensile Strength	≥ 650 MPa
Yield Strength (0.2% Offset)	≥ 450 MPa
Elongation	≥ 25%
Hardness	≤ 290 HB
Impact Strength	High at room temperature

Physical Properties

Property	Value
Density	7.8 g/cm³
Melting Range	1450 – 1500°C
Thermal Conductivity	~19 W/m·K
Electrical Resistivity	~0.80 µΩ·m
Coefficient of Thermal Expansion	13 µm/m°C (20–100°C)

Standard Sizes

Sheets & Plates

Thickness	Width	Length
0.5 mm – 50 mm	1000 / 1250 / 1500 mm	2000 – 6000 mm

Coils

Thickness	Width
0.3 mm – 8 mm	600 – 1500 mm

Pipes & Tubes

Type	Size Range
Seamless / Welded	½" – 12" (NB)

Rods / Bars

Diameter	Form
6 mm – 200 mm	Round, Square, Hex

Applications

Chemical processing and petrochemical plants.
Heat exchangers, pressure vessels, and evaporators.
Pulp & paper industry equipment.
Desalination and marine engineering components.
Oil & gas exploration and transport systems.
Structural components requiring high strength-to-weight ratio.
Food, fertilizer, and pharmaceutical industries.

Key Features

Exceptional resistance to pitting and crevice corrosion due to high Chromium, Molybdenum & Nitrogen content.
High mechanical strength compared to austenitic stainless steels.
Excellent resistance to chloride-induced stress corrosion cracking (SCC).
Good weldability and formability for industrial applications.
Suitable for aggressive and highly corrosive environments.

Chemical Composition (% by weight)

Element	Percentage (%)
Chromium (Cr)	24.0 – 26.0
Nickel (Ni)	6.0 – 8.0
Molybdenum (Mo)	3.0 – 5.0
Nitrogen (N)	0.24 – 0.32
Manganese (Mn)	≤ 1.2
Silicon (Si)	≤ 0.8
Carbon (C)	≤ 0.03
Phosphorus (P)	≤ 0.035
Sulfur (S)	≤ 0.02
Iron (Fe)	Balance

Mechanical Properties

Property	Value
Tensile Strength	795 MPa (min)
Yield Strength (0.2% Proof)	550 MPa (min)
Elongation	15% (min)
Hardness	≤ 310 HB

Physical Properties

Property	Value
Density	7.8 g/cm³
Melting Point	1350 – 1400°C
Thermal Conductivity	13 W/m·K (at 100°C)
Electrical Resistivity	0.8 µΩ·m
Modulus of Elasticity	200 GPa

Standard Sizes

Sheets & Plates

Thickness	Width	Length
0.5 mm – 50 mm	1000 / 1250 / 1500 / 2000 mm	2000 – 6000 mm

Coils

Thickness	Width
0.3 mm – 8 mm	1000 / 1250 / 1500 mm

Pipes

Type	Size Range
Seamless	1/2" to 12"
Welded	1" to 24"

Rods

Diameter
6 mm – 200 mm

Applications

Marine and offshore engineering
Chemical processing and storage equipment
Oil & gas pipelines and pressure vessels
Heat exchangers, condensers, and desalination plants
Pumps, valves, and industrial tubing
Power generation and energy industries
Pulp & paper processing equipment

Key Features

Excellent resistance to pitting and crevice corrosion (PREN ≥ 40).
High tensile and yield strength compared to stainless steel 300 series.
Outstanding resistance to chloride-induced stress corrosion cracking.
Good weldability and fabricability.
Superior performance in seawater, brine, chemical processing, and offshore environments.
Low thermal expansion and high thermal conductivity.

Chemical Composition (% by weight)

Element	Percentage (%)
Chromium (Cr)	24.0 – 26.0
Nickel (Ni)	6.0 – 8.0
Molybdenum (Mo)	3.0 – 4.0
Copper (Cu)	0.5 – 1.0
Tungsten (W)	0.5 – 1.0
Nitrogen (N)	0.20 – 0.30
Manganese (Mn)	≤ 1.0
Silicon (Si)	≤ 1.0
Carbon (C)	≤ 0.03
Iron (Fe)	Balance

Mechanical Properties

Property	Value
Tensile Strength	≥ 750 MPa
Yield Strength (0.2% Proof)	≥ 550 MPa
Elongation	≥ 25%
Hardness (Brinell)	≤ 310 HB

Physical Properties

Property	Value
Density	7.80 g/cm³
Melting Range	1350 – 1450°C
Thermal Conductivity	15 W/m·K
Electrical Resistivity	0.80 µΩ·m
Elastic Modulus	200 GPa

Standard Sizes

Sheets & Plates

Thickness	Width	Length
1 mm – 100 mm	Up to 2000 mm	Up to 6000 mm or custom-cut

Coils

Thickness	Width
0.5 mm – 10 mm	500 mm – 1500 mm

Pipes
Seamless & Welded

Outer Diameter	Schedule
6 mm – 600 mm	SCH 10 – SCH XXS

Rods

Diameter Range	Forms
5 mm – 300 mm	Round, Square, Hexagonal

Applications

Offshore oil & gas platforms
Seawater piping and desalination plants
Chemical and petrochemical processing
Pumps, valves, and heat exchangers
Marine engineering components
Pressure vessels and structural components
Paper & pulp industry equipment
High-corrosion industrial environments