Stainless Steel - Ferritic - 1.4003 (3CR12) Sheet and Plate

1.4003 (3CR12) Sheet and Plate

Type 1.4003 stainless steel is a utility ferritic stainless steel, often used in place of mild steel. It offers the benefits of more highly alloyed stainless steels such as strength, corrosion and abrasion resistance, durability and low maintenance. In addition type 1.4003 Is weldable and formable allowing it to be fabricated using conventional techniques. Benefits of using type 1.4003 stainless steel:
~ 250 times greater corrosion resistance than mild steel
~ Corrosion/abrasion resistance
~ Economical - Low initial cost, low maintenance
~ High Strength
~ Excellent impact resistance
~ Can be welded by conventional methods
~ Can eliminate need for protective coating
~ Can eliminate need for corrosion allowance
~ Proven success in many applications across a wide range of industries
~ Good performance at elevated temperatures
~ Lower cost than austenitic stainless

This has led to the use of type 4003 stainless steel in many applications across a broad range of industries.

Chemical Composition

Spec: EN 10088-2:2005

1.4003 Steel

Chemical Element % Present
Carbon (C) 0.0 - 0.03
Chromium (Cr) 10.50 - 12.50
Manganese (Mn) 0.0 - 1.50
Silicon (Si) 0.0 - 1.00
Phosphorous (P) 0.0 - 0.04
Sulphur (S) 0.0 - 0.02
Nickel (Ni) 0.30 - 1.00
Nitrogen (N) 0.0 - 0.03
Iron (Fe) Balance


Physical PropertyValue
Density 7.74 g/cm³
Melting Point 1430-1510 °C
Thermal Expansion 11.1-12.3 x10^-6 /K
Modulus of Elasticity 200 GPa
Thermal Conductivity 30.5 W/m.K
Electrical Resistivity 0.678 x10^-6 Ω .m

Spec: EN 10088-2:2005

Sheet & Plate - Up to 13.5mm Thick

Mechanical PropertyValue
Proof Stress 280 Min MPa
Tensile Strength 450-650 MPa
Elongation A 20 Min %

Spec: EN 10088-2:2005

Plate - Over 13.5mm to 25mm Thick

Mechanical PropertyValue
Proof Stress 250 Min MPa
Tensile Strength 450 - 650 MPa
Elongation A 18 Min %

Alloy Designations

Stainless Steel Grade 1.4003 also corresponds to but may not be a direct equvalent to:


Nirosta 4003 

Supplied Forms

  • Sheet
  • Tube
  • Plate


1.4003 stainless steel is typically used in:


Bulk wet materials handling

Vehicle frames/chassis

Rail car hoppers

Sweeper and gritter vehicles

Conveyors, chutes, screen, troughs

Bunkers & hoppers

Tanks & containers

Chimneys & ducting

Enclosures & cabinets

Walkways, stairs & railings

Cable trays

Corrosion Resistance

!.4003 stainess has 250 times the corrosion resistance of mild steels  and is particularly good in corrosion/abrasion applications.


Corrosion/Abrasion - The cycle of abrasive removal of a metal surface following surface corrosion rapidly erodes mild/carbon steels even when costly coatings are applied.  In wet or damp conditions where abrasion is present type 4003 provides excellent performance by resisting corrosion attack and thus maintaining better flow and slideability  compared to non-alloyed or low-alloy steels including abrasion resistant grades.


Type 4003 has a fine-grained microstructure which reduces grain growth in the heat-affected zone (HAZ) and allow high integrity welds in section thicknesses up to 30mm.  Suitable weld processes include SMAW, GTAW, FCAW, PAW, Laser, Spot and Seam.  Design and welding procedure consideration must be taken to avoid sensitization occurring in service.

Strength & Stiffness

Type 4003 offers higher strength than, and equal structural stiffness to, mild steels such as BSEN10113 Grade Fe430A (ASTM A36).  It also offers greater impact and energy resistance than aluminium.  It behaves much like austenitic steel in that it gradually yields and does not show a definite yield point.

Coating & Painting

Type 4003 provides good corrosion resistance and excellent abrasion resistance, hence does not need coating or painting systems to be applied for performance reasons.  For aesthetic reasons it may be desirable in some applications to apply paint, especially as type 4003 will tend to discolour in corrosive conditions.  Type 4003 has exceptional under-paint corrosion resistance and will continue to resist corrosion even where the paint coat has been damaged.  Normal preparation is required, such as ensuring a clean surface free of grease and other contamination.  A primer coat is recommended for cold-rolled material due to its smoother surface, but hot rolled 1D finish material may be suitably painted in a single coat.

Cost Benefit

Type 4003 is proven to offer lower life-cycle costs than traditional materials where service conditions involve corrosion and/or abrasion.  As compared to traditional materials there are options to reduce initial cost through the elimination of protective coatings and corrosion allowances.  In service cost savings come from reduced maintenance, improved productivity and significantly longer life.  

As type 4003 does not contain significant quantities of expensive alloying elements such as Nickel and Molybdenum, it is a lower cost material than austenitic stainless steel and can thus be considered as an option where these grades are not an economically viable choice.   


Datasheet Search

Last Datasheet Revision

13 March 2020


This Data is indicative only and as such is not to be relied upon in place of the full specification. In particular, mechanical property requirements vary widely with temper, product and product dimensions. All information is based on our present knowledge and is given in good faith. No liability will be accepted by the Company in respect of any action taken by any third party in reliance thereon.

Please note that the 'Datasheet Update' date shown above is no guarantee of accuracy or whether the datasheet is up to date.

The information provided in this datasheet has been drawn from various recognised sources, including EN Standards, recognised industry references (printed & online) and manufacturers’ data. No guarantee is given that the information is from the latest issue of those sources or about the accuracy of those sources.

Material supplied by the Company may vary significantly from this data, but will conform to all relevant and applicable standards.

As the products detailed may be used for a wide variety of purposes and as the Company has no control over their use; the Company specifically excludes all conditions or warranties expressed or implied by statute or otherwise as to dimensions, properties and/or fitness for any particular purpose, whether expressed or implied.

Advice given by the Company to any third party is given for that party’s assistance only and without liability on the part of the Company. All transactions are subject to the Company’s current Conditions of Sale. The extent of the Company’s liabilities to any customer is clearly set out in those Conditions; a copy of which is available on request.