Outokumpu Core range

stainless steelS for corrosive environments

The Core range contains austenitic and ferritic stainless steel products for mild to medium corrosive environments. The classic 18/8 stainless steel is part of Outokumpu Core range.

Key grades

Core 304/4301

Core 304/4301 is a classic 18% chromium, 8% nickel austenitic stainless steel. It’s an all-purpose product with good corrosion resistance and is suitable for a wide variety of applications that require good formability and weldability. Core 304/4301 can be delivered with a variety of surface finishes.

Core 304L/4307

Core 304L/4307 is a low-carbon alternative to Core 304/4301. The lower carbon content minimizes carbide precipitation as a result of heat input, for example during welding, giving improved resistance against intergranular corrosion. Core 304L/4307 is suitable for a wide variety of applications that require good formability and weldability, and can be delivered with a variety of surface finishes.


We believe in world that lasts forever

Why Core range

  • Austenitics are highly formable and weldable and are suitable for everything from cutlery to storage tanks. Ferritic stainless steels have good formability and are widely used by appliance makers.
  • Contains the all-purpose Core 304/4301 and Core 304L/4307, several alternatives, low-nickel and nickel-free products.
  • Home of Outokumpu's latest ferritic innovation: Core 4622
  • Why Outokumpu

    • Outokumpu is a global leader in stainless steel, and innovator of the first stainless steels in the world.
    • A strong customer focus, sustainability, and technical excellence are at the heart of everything we do.
    • As a customer you benefit from our strong R&D and technical support

    Why stainless steel

    • The durability of stainless steel means that it is not only the best, but also the most economically sustainable choice for a wide range of applications.
    • All of our products are made from an average of 85% recycled material and are fully recyclable at the end of their lifecycles.

    Outokumpu Core stainless steel grades

    Core 304/4301

    Description Core 304/4301 is a classic 18% chromium, 8% nickel austenitic stainless steel. It’s an all-purpose product with good corrosion resistance and is suitable for a wide variety of applications that require good formability and weldability. Core 304/4301 can be delivered with a variety of surface finishes.

    EN 1.4301

    ASTM type 304

    ASTM UNS S30400

    Microstructure Austenitic

    Typical applications

    • Household appliances and consumer goods
    • Kitchen equipment
    • Indoor and outdoor cladding, handrails and window frames
    • Food and beverage industry equipment
    • Storage tanks
    • Flanges and valves

    Datasheet Download Core range datasheet for more information on corrosion resistance, mechnanical properties, physical properties and fabrication.

    Typical chemical composition, % by mass

    C 0.04

    Cr 18.1

    Ni 8.1

    Mo -

    N -

    Others -

    Core 304L/4307

    Description Core 304L/4307 is a low-carbon alternative to Core 304/4301. The lower carbon content minimizes carbide precipitation as a result of heat input, for example during welding, giving improved resistance against intergranular corrosion. Core 304L/4307 is suitable for a wide variety of applications that require good formability and weldability, and can be delivered with a variety of surface finishes.

    EN 1.4307

    ASTM type 304L

    ASTM UNS S30403

    Microstructure Austenitic

    Typical applications

    • Food and beverage industry equipment
    • Chemical and pharmaceutical industry equipment (mild to medium corrosive environments)
    • Heat exchangers
    • Storage tanks
    • Tank containers
    • Pipes and tubes
    • Flanges and valves

    Datasheet Download Core range datasheet for more information on corrosion resistance, mechanical properties, physical properties and fabrication.

    Typical chemical composition,% by mass

    C 0.02

    Cr 18.1

    Ni 8.1

    Mo -

    N -

    Others -

    Core 304LN/4311

    Description A low-carbon, higher nickel and nitrogen alloyed alternative to Core 304L/4307 with improved strength and low-temperature toughness. Suitable for applications that require high tensile strength. 

    EN 1.4311

    ASTM type 304L

    ASTM UNS S30453

    Microstructure Austenitic

    Typical applications

    • Railroad cars
    • Pressure vessels
    • Chemical plant equipment (mild to medium corrosive environments)
    • Flanges and valves

    Datasheet Download Core range datasheet for more information on corrosion resistance, mechanical properties, physical properties and fabrication.

    Typical chemical composition, % by mass

    C 0.02

    Cr 18.5

    Ni 9.2

    Mo -

    N 0.14

    Others -

    Core 304L/4306

    Description A higher nickel alternative to Core 304L/4307 with improved formability and deep drawability.

    EN 1.4306

    ASTM type 304L

    ASTM UNS S30403

    Microstructure Austenitic

    Typical applications

    • Chemical and pharmaceutical plant equipment (mild to medium corrosive environments)
    • Flanges and valves

    Datasheet Download Core range datasheet for more information on corrosion resistance, mechanical properties, physical properties and fabrication.

    Typical chemical composition, % by mass

    C 0.02

    Cr 18.2

    Ni 10.1

    Mo -

    N -

    Others -

    Core 305/4303

    Description A high-nickel alternative to Core 304/4301 with reduced strain hardening and excellent cold-forming properties. Ideal for parts that require high degree of deformation. 

    EN 1.4303

    ASTM type 305

    ASTM UNS S30500

    Microstructure Austenitic

    Typical applications

    • Industrial parts with complex shapes
    • Sinks and other deep-drawn products
    • Complex stamping processes
    • Re-rollers producing very thin-gauge coils

    Datasheet Download Core range datasheet for more information on corrosion resistance, mechanical properties, physical properties and fabrication.

    Typical chemical composition, % by mass

    C 0.04

    Cr 17.7

    Ni 12.5

    Mo -

    N -

    Others -

    Core 321/4541

    Description A titanium-stabilized austenitic stainless steel with improved intergranular corrosion resistance for an extended temperature range.

    EN 1.4541

    ASTM type 321

    ASTM UNS S32100

    Microstructure Austenitic

    Typical applications

    • Anneailing covers
    • Stack liners
    • Automotive exhaust systems
    • Welded pressure vessels
    • Flanges and valves

    Datasheet Download Core range datasheet for more information on corrosion resistance, mechanical properties, physical properties and fabrication.

    Typical chemical composotion, % by mass

    C 0.04

    Cr 17.3

    Ni 9.1

    Mo -

    N -

    Others Ti

    Core 347/4550

    Description Core 347/4550 is a niobium stabilized alternative to Core 321/4541 with improved intergranular corrosion resistance and good mechanical properties at high temperatures. Core 347/4550 is particularly useful in applications with intermittent heating in the range 400–900 °C/750–1650 °F.

    EN 1.4550

    ASTM type 347

    ASTM UNS S34700

    Microstructure Austenitic

    Typical applications

    • High temperature gaskets
    • Rocket engine parts
    • Expansion joints
    • Aircraft collector rings
    • Exhaust manifolds
    • Chemical production equipment
    • Flanges and valves

    Datasheet Download Core range datasheet for more information on corrosion resistance, mechanical properties, physical properties and fabrication.

    Typical chemical composition, % by mass

    C 0.05

    Cr 17.5

    Ni

    9.5

    Mo -

    N -

    Others Nb

    Core 301LN/4318

    Description A low-carbon, nitrogen alloyed alternative to Core 301/4310 with elevated strength, making it particularly suitable for lightweight construction.

    EN 1.4318

    ASTM type 301LN

    ASTM UNS S30153

    Microstructure Austenitic

    Typical applications

    • Automotive applications, especially vehicles chassis
    • Railroad cars

    Datasheet Download Core range datasheet for more information on corrosion resistance, mechanical properties, physical properties and fabrication.

    Typical chemical composition, % by mass

    C 0.02

    Cr 17.7

    Ni 6.5

    Mo -

    N 0.14

    Others -

    Core 301/4310

    Description A lower chromium and nickel alternative to Core 304/4301 with high work hardening capacity, this is a good choice for applications subjected to high mechanical loading

    EN 1.4310

    ASTM type 301

    ASTM UNS S30100

    Microstructure Austenitic

    Typical applications

    • Springs
    • Press plates
    • Conveyor chains
    • Mixer blades
    • Sinks

    Datasheet Download Core range datasheet for more information on corrosion resistance, mechanical properties, physical properties and fabrication.

    Typical chemical composition, by mass %

    C 0.10

    Cr 17.0

    Ni 7.0

    Mo -

    N -

    Others -

    Core 201/4372

    Description This low-nickel stainless steel has properties approaching Core 301/4310 but with a higher work hardening coefficient. Grade is available from Outokumpu Americas.

    EN 1.4372

    ASTM type 201

    ASTM UNS S20100

    Microstructure Austenitic

    Typical applications

    • Household appliances
    • Kitchen utensils
    • Sinks
    • Doors and windows
    • Railroad cars

    Typical chemical composition, % by mass

    C 0.05

    Cr 16.1

    Ni 3.6

    Mo -

    N 0.08

    Others 7Mn

    Core 201LN/4372

    Description This low-nickel stainless steel also has properties approaching Core 301/4310, but has a higher strength than Core 201/4372. It hardens more quickly due to its higher work hardening coefficient. Grade is available from Outokumpu Americas.

    EN 1.4372

    ASTM type 201LN

    ASTM UNS S20153

    Microstructure Austenitic

    Typical applications

    • Railroad freight cars
    • Truck trailers
    • Coal handling
    • Bulk transport equipment

    Datasheet Download Outokumpu_Core_datasheet for more information on corrosion resistance, mechanical properties, physical properties and fabrication.

    Typical chemical composition, % by mass

    C 0.03

    Cr 16.2

    Ni 4.0

    Mo -

    N 0.20

    Others Cu, 6.5Mn

    Core 441/4509

    Description A nickel-free 17% chromium ferritic stainless steel grade with good corrosion resistance and high-temperature strength was originally designed for exhaust systems. Core 441/4509 is available with single (niobium) or dual (niobium and titanium) stabilization. Due to good formability and weldability it is often a suitable replacement for Core 301/4310. 

    EN

    1.4509

     

    ASTM type -

    ASTM UNS S43940

    Microstructure Ferritic

    Usage

    • Indoor claddings
    • Restaurant equipment and appliances
    • Tubes
    • Heat exchangers

    Datasheet Download Core range datasheet for more information on corrosion resistance, mechanical properties, physical properties and fabrication.

    Typical chemical composition, % by mass

    C 0.02

    Cr 17.6

    Ni -

    Mo -

    N

    -

     

    Others Nb, Ti 

    Core 4622

    Description A nickel-free, high-chromium (21Cr) ferritic stainless steel with equal corrosion resistance to Core 304/4301. Core 4622 has excellent deep drawability and is almost ridging free, meaning it is easier to polish and has a lower overall production cost.

    EN 1.4622

    ASTM type -

    ASTM UNS S44330

    Microstructure Ferritic

    Typical applications

    • Household, catering and architectural applications (indoor and outdoor)
    • Tubular products for automotive and process industries
    • Building facades
    • Tanks and process equipment

    Datasheet Download Core range datasheet for more information on corrosion resistance, mechanical properties, physical properties and fabrication.

    Typical chemical composition, % by mass

    C 0.02

    Cr 21.0

    Ni -

    Mo -

    N -

    Others Nb,Ti,Cu

    Core 434/4113

    Description A molybdenum-alloyed ferritic stainless steel that offers improved corrosion resistance. This grade is available from Outokumpu Americas.

    EN 1.4113

    ASTM type 434

    ASTM UNS S43400

    Microstructure Ferritic

    Typical applications

    • Automotive trim and fittings

    Datasheet Download Core range datasheet for more information on corrosion resistance, mechanical properties, physical properties and fabrication.

    Typical chemical composition, % by mass

    C 0.04

    Cr 16.5

    Ni -

    Mo 1.0

    N -

    Others -

    Standards and approvals for Core range

    EN ISO 18286 Hot-rolled stainless steel plates – Tolerances on dimensions and shape
    EN 10051
    Hot-rolled steel strip.
    EN 10088-1
    Stainless steels – list of stainless steels
    ISO 15510
    Stainless steels – chemical composition
    EN ISO 9445
    Cold-rolled stainless narrow strip, wide strip, plate/sheet and cut lengths.
    ASTM A 480
    General requirements for flat-rolled stainless and heat resisting steel
    ASTM A 959
    Harmonized standard grade compositions for wrought stainless steels
    ASME IID
    Materials – Physical properties tables

    EN 10028-7 Flat products for pressure purposes – Stainless steels
    EN 10088-2
    Stainless steels – sheet/plate and strip for general purposes
    EN 10088-3
    Stainless steels – semi-finished products, bars, rods sections for general purposes
    EN 10088-4
    Technical delivery conditions for sheet/plate and strip
    EN 10095
    Heat resisting steels and nickel alloys
    EN 10151
    Stainless steel strip for springs
    EN 10217-7
    Welded steel tubes for pressure purposes – Stainless steel tubes
    EN 10296-2
    Welded circular steel tubes for mechanical and general engineering purposes – Stainless Steel tubes
    EN 10302
    Creep resisting steels, nickel and cobalt alloys
    ASTM A 167
    Stainless and heat-resisting Cr-Ni steel plate, sheet, and strip
    ASTM A 176
    Stainless and heat-resisting Cr steel plate, sheet, and strip
    ASTM A182/ ASME SA-182
    Stainless steel and heat resisting steel bars and shapes
    ASTM A 240
    Cr and Cr-Ni stainless steel plate, sheet and strip for pressure vessels
    ASTM A276
    Stainless steel and heat-resisting steel rod and wire for cold heading and forging
    ASTM A479/ ASME SA-479
    General requirements for stainless and heat resistant steel wire and wire rod
    ASTM A 666
    Austenitic stainless steel sheet, strip, plate, bar for structural and architectural applications
    ASME IIA Materials. Part A –
    Ferrous Material Specifications
    Eurocode 3 / EN 1993-1-4
    Design of steel structures – Part 1-4: General rules – Supplementary rules for stainless steels

    The most commonly used international product standards are given here. For a list of standards by product, see steelfinder.outokumpu.com

    Outokumpu meets the most common certifications and approvals, including:

    • AD 2000 Merkblatt
    • Approval of Material Manufacturers
    • Factory Production Control Certificate
    • ISO 9001
    • ISO 14001
    • ISO 50001
    • ISO/TS 16949
    • NORSOK
    • OHSAS 18001
    • Pressure Equipment Directive (PED)

    Explore the world of stainless steel

    Your contact

    [OfficeName]

    [OfficeMail] [OfficePhone]

    Follow us on social media