What is T4003 /3Cr12 stainless steel?
3Cr12 stainless steel sheet is a ferritic stainless steel containing 12% Cr, which is equivalent to the European 1.4003 grade. It is an economical ferritic stainless steel used to replace coated carbon steel, weathering steel and aluminium. It has the characteristics of simple processing and manufacturing, and can be welded by conventional welding technology. It can be used to make: motor vehicle frames, chassis, hoppers, conveyor belts, mesh screens, conveying troughs, coal bins, containers and tanks, chimneys, air ducts, and outer covers , Panels, sidewalks, stairs, rails, etc.
Type 1.4003/ T4003 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:
1. 250 times greater corrosion resistance than mild steel
2. Corrosion/abrasion resistance
3. Economical - Low initial cost, low maintenance
4. High Strength
5. Excellent impact resistance
6. Can be welded by conventional methods
7. Can eliminate need for protective coating
8. Can eliminate need for corrosion allowance
9. Proven success in many applications across a wide range of industries
10. Good performance at elevated temperatures
11. 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.
ALLOY DESIGNATIONS
Stainless Steel Grade 1.4003 also corresponds to but may not be a direct equivalent to:
3CR12 / T 4003
Chemical composition of T4003 /3Cr12 stainless steel sheet
Carbon C: ≤0.03
Silicon Si: ≤1.00
Manganese Mn: ≤1.5
sulfur S: ≤0.015
Phosphorus P: ≤0.040
Chromium Cr: 10.5～12.5
Nickel Ni: 0.3～1.0
Nitrogen N: ≤0.030
Mechanical properties of 3Cr12 stainless steel sheet
Tensile strength σb(MPa): 450～650
Conditional yield strength σ0.2 (MPa): ≥320 (≤6mm), ≥280 (>6mm)
Elongation δ5 (%): ≥20 (≤6mm), ≥18 (>6mm)
Impact energy Akv(J): ≥50 (≥15mm), ≥35 (less than 15mm)
Hardness: ≤200 (≤12mm), ≤250 (>12mm)
SUPPLIED FORMS
Sheet
Tube
Plate
APPLICATIONS
1.4003 stainless steel is typically used in:
Bulk wet materials handling
Vehicle frames/chassis
Rail car hoppers
Sweeper and glitter vehicles
Conveyors, chutes, screen, troughs
Bunkers & hoppers
Tanks & containers
Chimneys & ducting
Enclosures & cabinets
Walkways, stairs & railings
Cable trays
CORROSION RESISTANCE
T.4003 stainless 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 slide-ability compared to non-alloyed or low-alloy steels including abrasion resistant grades.
WELDABILITY
Type 4003 has a fine-grained microcosmicture which reduces grain growth in the heat-affected zone (HAZ) and allow high integrity welds in section thicknesses up to 30 mm. 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, 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.
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