Type 1.4003 stainless steel was developed as an alternative material for construction where the mechanical properties, corrosion resistance and fabrication requirements of other materials such as mild steel, galvanised steel, aluminised steel, aluminium or pre-painted steels are unsuitable.
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.
| Sheet Size (ID Finish) | Thicknesses |
|---|---|
| 2000 x 1000 | 2.0mm - 4.0mm |
| 2500 x 1250 | 2.0mm - 4.0mm |
| 3000 x 1500 | 2.0mm - 4.0mm |
Stainless steel grade 1.4003 also corresponds to but may not be a direct equvalent to:
| Chemical Element | % Present |
|---|---|
Carbon (C) | 0.00 - 0.03 |
Chromium (Cr) | 10.50 - 12.50 |
Manganese (Mn) | 0.00 - 1.50 |
Silicon (Si) | 0.00 - 1.00 |
Phosphorous (P) | 0.00 - 0.04 |
Sulphur (S) | 0.00 - 0.02 |
Nickel (Ni) | 0.30 - 1.00 |
Nitrogen (N) | 0.00 - 0.03 |
Iron (Fe) | Balance |
| Mechanical Property | Value |
|---|---|
Proof Stress | 260 Min Mpa |
Tensile Strength | 450-600 MPa |
Hardness Brinell | 200 Max HB |
Elongation A | 20 Min % |
| Mechanical Property | Value |
|---|---|
Proof Stress | 280 Min MPa |
Tensile Strength | 450-650 MPa |
Elongation A | 20 Min % |
| Mechanical Property | Value |
|---|---|
Proof Stress | 250 Min MPa |
Tensile Strength | 450 - 650 MPa |
Elongation A | 18 Min % |
| Physical Property | Value |
|---|---|
Density | 7.74 g/cm³ |
Melting Point | 1430-1510 °C |
Thermal Expansion | 11.1-12.3 x 10-6/K |
Modulus of Elasticity | 200 GPa |
Thermal Conductivity | 30.5 W/m.K |
Electrical Resistivity | 0.678 x 10-6 Ω .m |
Type 1.4003 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.
Type 1.4003 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 1.4003 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.
1.4003 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 1.4003 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 1.4003 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.
Type 1.4003 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 1.4003 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.
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