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Cost Benefits - Sheet 1.4003

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 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.

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 is 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.

All Data is indicative only and must not be seen as a substitute for the full specification from which it is drawn. In particular, the mechanical property requirements vary widely with product form and product dimensions.

For more complete details please refer to the relevant specification – The BS EN Specifications for Stainless Steel are listed on a separate Datasheet.

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 (subject to equipment used).

• Chemical Composition Carbon: 0.03%
• Max Silicon: 1.00%
• Max Manganese: 1.50%
• Max Phosphorus: 0.040%
• Max Sulphur: 0.015%
• Max Chromium: 10.50 to 12.50% Nickel 0.30 to 1.00% Nitrogen 0.03%
• Max Dimensional Tolerances Cold Rolled in accordance with BSEN 10259 Hot Rolled in accordance with BS EN 10051 Category B

Other Properties:

• Poisson's Ratio: 0.32
• Initial Shear Modulus: 108 GPa
• Limit of Proportionality: 130 GPa (Tension)
• Ultimate Shear Strength: 245 MPa

Sheet 1.4003
Sheet 1.4003
Sheet 1.4003
Sheet 1.4003