HeatOnn Alloys

Martensitic Stainless Steel

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

Martensitic Stainless Steels are high-strength, heat-treatable alloys known for their excellent hardness, wear resistance, and moderate corrosion resistance. They typically contain higher carbon levels than ferritic or austenitic stainless steels, enabling transformation to martensite through heat treatment. These grades are widely used in applications requiring strength, edge retention, and durability.

Key Features

High hardness and excellent wear resistance
Heat-treatable for enhanced strength
Moderate corrosion resistance
High tensile and yield strength compared to other stainless steels
Magnetic in all conditions
Good machinability when annealed
Suitable for applications requiring cutting, impact resistance, and durability

Applications

Cutlery and knives
Surgical instruments
Pump shafts and valve components
Automotive components
Wear-resistant parts
Steam turbine blades
Fasteners & bolts
Industrial equipment requiring strength and hardness

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Key Features

Good resistance to oxidation and corrosion in mild environments.
Superior ductility compared to other martensitic grades.
Designed to minimize hardening during air cooling after annealing.
High strength and moderate hardness.
Good weldability compared to other high-chromium martensitic steels.
Suitable for elevated temperature applications.

Chemical Composition (% by weight)

Element	Composition (%)
Carbon (C)	0.08 max
Chromium (Cr)	11.5 – 14.5
Manganese (Mn)	1.00 max
Silicon (Si)	1.00 max
Nickel (Ni)	0.5 max
Phosphorus (P)	0.04 max
Sulfur (S)	0.03 max
Aluminum (Al)	0.10 – 0.30

Mechanical Properties

Property	Value
Tensile Strength	380 – 550 MPa
Yield Strength	205 MPa (min)
Elongation	20% (min)
Hardness	HRB 88 max

Physical Properties

Property	Value
Density	7.75 g/cm³
Melting Point	1450–1510°C
Thermal Conductivity	24 W/m·K
Electrical Resistivity	0.60 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	600 – 1500 mm

Pipes

Type	Size Range
Seamless / Welded	1/2" to 8" (NB)

Rods

Diameter Range
5 mm – 200 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

High strength and hardness due to martensitic microstructure
Good corrosion resistance in mild atmospheres, steam, and some chemicals
Excellent wear resistance
Can be heat treated for enhanced mechanical performance
Magnetic in all conditions
Cost-effective alternative to higher-grade stainless steels

Chemical Composition (% by weight)

Element	Percentage (%)
Carbon (C)	0.08 – 0.15
Chromium (Cr)	11.5 – 13.5
Manganese (Mn)	≤ 1.00
Silicon (Si)	≤ 1.00
Nickel (Ni)	≤ 0.75
Phosphorus (P)	≤ 0.040
Sulfur (S)	≤ 0.030

Mechanical Properties

Property	Value
Tensile Strength	~ 450 – 650 MPa
Yield Strength	~ 205 – 450 MPa
Elongation	15 – 20%
Hardness (Annealed)	≤ 183 HB
Hardness (Hardened/Tempered)	Up to 500 HB

Physical Properties

Property	Value
Density	7.75 g/cm³
Melting Point	1480°C
Thermal Conductivity	24.9 W/m·K
Electrical Resistivity	0.57 µΩ·m
Modulus of Elasticity	200 GPa

Standard Sizes

Sheets & Plates

Thickness	Width	Length
0.5 mm – 80 mm	1000 / 1250 / 1500 mm	2000 – 6000 mm

Coils

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

Pipes

OD Range	Wall Thickness
6 mm – 600 mm	1 mm – 30 mm

Rods

Diameter	Form
5 mm – 300 mm	Bright / Black / Forged

Applications

Steam and gas turbine components
Cutlery and kitchen utensils
Pump rods and valve components
Mechanical springs
Automotive components
Petrochemical processing equipment
Bolts, screws, and fasteners
Heat-treated structural parts

Key Features

Excellent resistance to oxidation and scaling up to 815°C.
Low carbon content ensures improved weldability and reduced hardening risk.
Good corrosion resistance in mild environments.
Superior thermal stability during prolonged exposure to high heat.
Reduced risk of cracking during fabrication compared to standard 410.

Chemical Composition (% by weight)

Element	Percentage (%)
Carbon (C)	≤ 0.08
Chromium (Cr)	11.5 – 13.5
Manganese (Mn)	≤ 1.00
Silicon (Si)	≤ 1.00
Nickel (Ni)	≤ 0.60
Phosphorus (P)	≤ 0.040
Sulphur (S)	≤ 0.030
Iron (Fe)	Balance

Mechanical Properties

Property	Value
Tensile Strength	380 – 550 MPa
Yield Strength	≥ 205 MPa
Elongation	≥ 20%
Hardness (Brinell)	≤ 183 HBW

Physical Properties

Property	Value
Density	7.70 g/cm³
Melting Range	1480 – 1530°C
Thermal Conductivity	24.9 W/m·K at 100°C
Electrical Resistivity	0.60 µΩ·m at 20°C

Standard Sizes

Sheets & Plates

Thickness	Width	Length
0.5 mm – 50 mm	1000 / 1250 / 1500 mm	2000 / 2500 / 3000 mm

Coils

Thickness	0.3 mm – 8 mm
Width	Up to 1500 mm

Pipes

Seamless	6 mm – 273 mm OD
Welded	12.7 mm – 610 mm OD

Rods

Diameter Range	5 mm – 200 mm

Applications

Automotive exhaust systems
Industrial furnace components
Heat exchangers and thermal equipment
Petrochemical plant equipment
Annealing boxes and combustion chambers
Oil & gas refinery parts exposed to high temperatures
Fabricated components requiring improved weldability

Key Features

Free-machining martensitic stainless steel with excellent machinability.
Good corrosion resistance in mild environments.
High strength and hardness after heat treatment.
Magnetic in both annealed and hardened conditions.
Suitable for high-speed machining and precision components.
Good wear resistance and dimensional stability.

Chemical Composition (% by weight)

Element	Percentage (%)
Carbon (C)	0.15 max
Chromium (Cr)	12.0 – 14.0
Manganese (Mn)	1.25 max
Silicon (Si)	1.0 max
Phosphorus (P)	0.06 max
Sulfur (S)	0.15
Molybdenum (Mo)	0.60 max
Iron (Fe)	Balance

Mechanical Properties

Property	Value
Tensile Strength	≥ 620 MPa
Yield Strength	≥ 275 MPa
Elongation	≥ 20%
Hardness (Annealed)	≤ 217 HB
Hardness (Hardened)	Up to 370 HB

Physical Properties

Property	Value
Density	7.75 g/cm³
Melting Range	1480–1530°C
Thermal Conductivity	24.9 W/m·K
Electrical Resistivity	0.60 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
0.5 mm – 3 mm	1000 / 1250 mm

Pipes

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

Rods

Shape	Size Range
Round	6 mm – 300 mm
Square	10 mm – 150 mm
Hexagonal	10 mm – 100 mm

Applications

Valve components
Pump shafts
Motor shafts
Studs, nuts, fasteners
Gears and mechanical parts
High-speed machined components
Automotive parts
Oil & gas equipment

Key Features

High hardness and excellent wear resistance
Good corrosion resistance in mild atmospheres and fresh water
Heat-treatable to achieve very high strength and hardness levels
Magnetic in all conditions
Excellent polishability — suitable for surgical and cutlery applications
Good machinability in annealed condition

Chemical Composition (% by weight)

Element	Percentage (%)
Carbon (C)	0.15 – 0.40
Chromium (Cr)	12.0 – 14.0
Manganese (Mn)	≤ 1.0
Silicon (Si)	≤ 1.0
Phosphorus (P)	≤ 0.040
Sulfur (S)	≤ 0.030
Iron (Fe)	Balance

Mechanical Properties

Property	Value
Tensile Strength	700 – 800 MPa (annealed), up to 1000+ MPa (hardened)
Yield Strength	≥ 350 MPa (annealed)
Elongation	≥ 15%
Hardness	Hardened: 48–52 HRC

Physical Properties

Property	Value
Density	7.75 g/cm³
Melting Point	1480°C
Thermal Conductivity	24.9 W/m·K
Electrical Resistivity	0.55 µΩ·m
Modulus of Elasticity	200 GPa

Standard Sizes

Sheets & Plates

Thickness	Width	Length
0.5 mm – 50 mm	500 mm – 2000 mm	Custom / Coil Form

Coils

Thickness	Width
0.3 mm – 6 mm	Up to 1500 mm

Pipes

Outer Diameter	Wall Thickness
6 mm – 600 mm	0.5 mm – 25 mm

Rods

Diameter Range	Forms
6 mm – 200 mm	Round, Square, Hexagonal

Applications

Surgical instruments
Cutlery and blades
Pump shafts and valve components
Bearings and bushings
Hand tools and wear-resistant parts
Industrial equipment requiring high hardness
Automotive components

Key Features

High strength and hardness, especially at elevated temperatures
Good corrosion and oxidation resistance
Excellent creep and stress-rupture properties
Suitable for high-temperature turbine and aerospace components
Good toughness after heat treatment

Chemical Composition (% by weight)

Element	Percentage (%)
Carbon (C)	0.20 – 0.25
Chromium (Cr)	11.0 – 13.0
Molybdenum (Mo)	0.75 – 1.25
Tungsten (W)	0.75 – 1.25
Nickel (Ni)	0.50 max
Silicon (Si)	1.00 max
Manganese (Mn)	1.00 max
Phosphorus (P)	0.040 max
Sulfur (S)	0.030 max

Mechanical Properties

Property	Value
Tensile Strength	≥ 965 MPa
Yield Strength	≥ 725 MPa
Elongation	≥ 15%
Hardness (HB)	290 – 330 HB
Impact Strength	High (after heat treatment)

Physical Properties

Property	Value
Density	7.70 g/cm³
Melting Point	1450 – 1510°C
Thermal Conductivity	24 W/m·K
Electrical Resistivity	0.60 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
0.5 mm – 6 mm	1000 / 1250 / 1500 mm

Pipes

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

Rods

Form	Diameter Range
Round / Square / Hex	6 mm – 200 mm

Applications

Steam turbine components
Aerospace hot-section parts
High-temperature fasteners and bolts
Petrochemical and refinery components
Valves, shafts, and pump components
Heat-resistant structural parts

Key Features

High strength and hardness combined with moderate corrosion resistance.
Excellent resistance to torque, stress, and fatigue.
Good toughness and tensile strength after heat treatment.
Magnetic in all conditions.
Suitable for high-load and high-torque mechanical components.

Chemical Composition (% by weight)

Element	Percentage (%)
Carbon (C)	0.12 – 0.22
Chromium (Cr)	15.0 – 17.0
Manganese (Mn)	≤ 1.0
Silicon (Si)	≤ 1.0
Nickel (Ni)	1.25 – 2.5
Phosphorus (P)	≤ 0.04
Sulfur (S)	≤ 0.03

Mechanical Properties

Property	Value
Tensile Strength	930 – 1080 MPa
Yield Strength	≥ 690 MPa
Elongation	10 – 12%
Hardness	240 – 285 HB

Physical Properties

Property	Value
Density	7.75 g/cm³
Melting Point	1450 – 1510°C
Thermal Conductivity	25 W/m·K
Electrical Resistivity	0.60 µΩ·m

Standard Sizes

Sheets & Plates

Thickness (mm)	Width (mm)	Length (mm)
0.5 mm – 60 mm	1000 mm / 1250 mm / 1500 mm	2000 mm – 6000 mm

Coils

Thickness (mm)	Width (mm)
0.5 mm – 6 mm	600 mm – 1500 mm

Pipes
Seamless & Welded

Outside Diameter	Wall Thickness
6 mm – 600 mm	As per requirement

Rods

Diameter	Forms
5 mm – 400 mm	Round, Square, Hexagonal

Applications

Pumps, shafts, and valves requiring high strength.
Aircraft components and mechanical gears.
High-torque fasteners and bolts.
Oil & gas machinery parts.
Marine hardware and power-generation components.

Key Features

High carbon martensitic stainless steel offering excellent hardness and wear resistance.
Good corrosion resistance in mild environments.
Capable of achieving very high strength after heat treatment.
Suitable for cutting tools, knives, and high-wear components.
Good toughness and machinability when annealed.

Chemical Composition (% by weight)

Element	Percentage (%)
Carbon (C)	0.60 – 0.75
Chromium (Cr)	16.0 – 18.0
Manganese (Mn)	≤ 1.0
Silicon (Si)	≤ 1.0
Nickel (Ni)	≤ 0.75
Phosphorus (P)	≤ 0.04
Sulfur (S)	≤ 0.03

Mechanical Properties

Property	Value
Tensile Strength (Annealed)	~ 760 MPa
Tensile Strength (Hardened)	Up to 1900 MPa
Yield Strength	~ 450 MPa
Elongation	~ 20%
Hardness (Annealed)	~ 200 HB
Hardness (Hardened)	Up to 58 HRC

Physical Properties

Property	Value
Density	7.65 g/cm³
Melting Point	1480°C
Thermal Conductivity	24 W/m·K
Electrical Resistivity	0.60 µΩ·m

Standard Sizes

Sheets & Plates

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

Coils

Thickness	Width
0.5 mm – 6 mm	50 – 1500 mm

Pipes

Type	Size Range
Seamless / Welded	½" to 12" OD

Rods

Diameter	Shape
3 mm – 200 mm	Round / Square / Hex

Applications

Cutlery and knife blades
Surgical and medical instruments
Bearings and valve components
Pump shafts and high-wear mechanical parts
Industrial blades and cutting tools
Automotive and aerospace components requiring high hardness

Key Features

High carbon content enabling high hardness and strength
Excellent wear and abrasion resistance
Good corrosion resistance in mild environments
Superior edge retention and durability
Capable of being heat-treated to high hardness levels
Suitable for precision engineering applications

Chemical Composition (% by weight)

Element	Percentage (%)
Carbon (C)	0.75 – 0.95
Chromium (Cr)	16.0 – 18.0
Manganese (Mn)	≤ 1.0
Silicon (Si)	≤ 1.0
Nickel (Ni)	≤ 0.75
Molybdenum (Mo)	≤ 0.75
Phosphorus (P)	≤ 0.040
Sulfur (S)	≤ 0.030
Iron (Fe)	Balance

Mechanical Properties

Property	Value
Tensile Strength	~ 760 – 1980 MPa (depending on heat treatment)
Yield Strength	~ 450 – 1500 MPa
Hardness	Up to 58 – 60 HRC (heat-treated)
Elongation	~ 2 – 10%

Physical Properties

Property	Value
Density	7.70 g/cm³
Melting Point	1375 – 1450°C
Thermal Conductivity	24 W/m·K
Electrical Resistivity	0.60 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 – 4 mm	600 – 1500 mm

Pipes

Outer Diameter	Wall Thickness
6 mm – 323 mm	1 mm – 12 mm

Rods

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

Applications

Knife blades and cutting tools
Surgical instruments
Valve components and pump parts
Bearings and wear-resistant components
Dies, gauges, and measuring tools
Defense and tactical equipment
High-strength shafts and mechanical parts

Key Features

High carbon martensitic stainless steel known for exceptional hardness and wear resistance.
Excellent corrosion resistance in mild environments.
Capable of achieving very high strength after heat treatment.
Good dimensional stability and polishability.
Ideal for applications requiring sharp edges and long-lasting durability.

Chemical Composition (% by weight)

Element	Percentage (%)
Carbon (C)	0.95 – 1.20
Chromium (Cr)	16.0 – 18.0
Manganese (Mn)	≤ 1.0
Silicon (Si)	≤ 1.0
Nickel (Ni)	≤ 0.75
Phosphorus (P)	≤ 0.040
Sulfur (S)	≤ 0.030

Mechanical Properties

Property	Value
Tensile Strength	760 – 1090 MPa (annealed)
Yield Strength	≥ 450 MPa (annealed)
Hardness	HRC 56 – 60 (heat treated)
Elongation	≈ 14%
Modulus of Elasticity	~ 200 GPa

Physical Properties

Property	Value
Density	7.70 g/cm³
Melting Point	1398 – 1421°C
Thermal Conductivity	24.2 W/m·K
Electrical Resistivity	~ 600 nΩ·m

Standard Sizes

Sheets & Plates

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

Coils

Thickness	Width
0.5 mm – 6 mm	Up to 1500 mm

Pipes

OD Range	Wall Thickness
6 mm – 219 mm	1 mm – 12 mm

Rods

Diameter Range	Form
3 mm – 200 mm	Bright / Black / Peeled

Applications

Cutlery and surgical instruments
High-performance bearings and valve components
Precision tools and gauges
Automotive and aerospace parts requiring high hardness
Pump shafts and mechanical components
Wear-resistant parts and industrial blades

Key Features

Excellent resistance to oxidation and scaling at elevated temperatures
High chromium content for superior corrosion resistance
Good resistance to sulfidation and hot corrosion
Magnetic in all conditions
High strength at elevated temperatures
Suitable for high-temperature industrial applications

Chemical Composition (% by weight)

Element	Percentage (%)
Carbon (C)	0.20 max
Chromium (Cr)	23.0 – 27.0
Manganese (Mn)	1.50 max
Silicon (Si)	1.00 max
Nickel (Ni)	0.50 max
Sulfur (S)	0.030 max
Phosphorus (P)	0.040 max
Iron (Fe)	Balance

Mechanical Properties

Property	Value
Tensile Strength	450 – 550 MPa
Yield Strength	280 – 350 MPa
Elongation	18% min
Hardness	180 – 220 HB

Physical Properties

Property	Value
Density	7.75 g/cm³
Melting Point	1425 – 1510°C
Thermal Conductivity	24 W/m·K
Electrical Resistivity	0.60 µΩ·m

Standard Sizes

Sheets & Plates

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

Coils

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

Pipes

Type	Size Range
Seamless / Welded	1/2" – 24"

Rods

Diameter Range
5 mm – 200 mm

Applications

Heat exchangers and furnace components
High-temperature exhaust systems
Boiler parts and combustion chambers
Petrochemical processing equipment
Industrial heaters and burners
Rotary kilns and thermal processing equipment
Metallic conveyor belts for high-temperature use