Core

Acciaio inox per ambienti corrosivi

Sfoglia le specifiche della gamma Core. Visit Stainless Steel Finder

La nostra gamma Core include prodotti in acciaio inox austenitico e ferritico per ambienti mediamente corrosivi. La gamma è adatta per un'ampia varietà di applicazioni per cui è richiesta una buona formabilità e saldabilità.

Acciai inossidabili per ambienti corrosivi

La gamma Core include 15 prodotti in acciaio inossidabile progettati per ambienti da moderatamente a mediamente corrosivi. Contattaci per avere maggiori informazioni sui nostri prodotti. 

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Core

La gamma Core include gradi di acciai inossidabili austenitici e ferritici per ambienti da moderatamente a mediamente corrosivi con un valore PRE compreso tra 17 – e 22. 

Il grado di acciaio inossidabile austenitico più utilizzato, Core 304L/4307 (EN 1.4307), definisce il panorama complessivo della gamma Core. Tale gamma è completata dai moderni acciai inossidabili ferritici stabilizzati al 18 – 21% di cromo privi di nichel, come Core 441/4509 (EN 1.4509), e alternative austenitiche a basso tenore di nichel.

L'ultima novità della gamma Core è l'acciaio inossidabile ferritico stabilizzato al 21% di cromo, Core 4622 (EN 1.4622). Il Core 4622 senza nichel offre resistenza alla corrosione e saldabilità simili e miglior trasferimento di calore, lavorabilità e trafilabilità profonda rispetto al 304L.

Gli acciai inossidabili austenitici Cr-Ni della gamma Core hanno buone capacità di resistenza alla corrosione, saldatura e formatura, e in particolare presentano caratteristiche di formatura per stiramento. Gli acciai austenitici vantano una duttilità molto elevata anche a temperature criogeniche. A causa della maggiore durezza e dell'incrudimento naturali degli acciai inossidabili austenitici, può essere necessaria un'attenzione particolare durante le operazioni di formatura e lavorazione rispetto agli acciai inossidabili ferritici o al carbonio. 

I moderni acciai inossidabili ferritici stabilizzati della gamma Core possiedono buone proprietà di saldatura e imbutitura e resistenza alla corrosione. Grazie alla struttura frazionata, gli acciai inossidabili ferritici privi di nichel hanno un'eccellente resistenza alla tensocorrosione indotta da cloruri. I ferritici hanno buone proprietà di trasferimento del calore che possono essere sfruttate in applicazioni in cui si predilige un trasferimento di calore uniforme e rapido. Un buon trasferimento di calore con una minore espansione termica facilita la saldabilità grazie alla minore distorsione della saldatura e al comportamento meno instabile rispetto agli austenitici. Inoltre, i ferritici hanno una lavorabilità simile a quella degli acciai al carbonio, a causa della bassa tendenza all'incrudimento.

I gradi della gamma Core possono essere utilizzati in un ampio ventaglio di applicazioni, con il supporto di una vasta selezione di finiture superficiali fornito da stabilimenti e Centri servizi.

Vedi di seguito l'elenco completo dei gradi Core

Outokumpu Core 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.

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 -

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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.

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 -

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Core 304LN/4311

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 -

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Core 304L/4306

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 -

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Core 305/4303

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 -

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Core 321/4541

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

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Core 347/4550

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

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Core 301LN/4318

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 -

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Core 301/4310

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 -

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Core 201/4372

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

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Core 201LN/4372

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

Outokumpu_Core_datasheet Download 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

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Core 441/4509

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 

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Core 4622

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

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Core 434/4113

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 -

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Go directly to Outokumpu Core grades

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

The most commonly used international product standards are given here. For a list of standards by product, go to Stainless Steel Finder.

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, go to Stainless Steel Finder.

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)


The most commonly used international product standards are given here. For a list of standards by product, go to Stainless Steel Finder.

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