UNS S30403 Stainless Steel Knowledge

Description

UNS S30403 is the low-carbon modification of S30400, developed specifically to overcome intergranular corrosion after welding. With a maximum carbon content of 0.03%, it minimizes chromium carbide precipitation in the heat-affected zone during welding, eliminating the need for post-weld annealing. It maintains the same chromium and nickel content as S30400, preserving excellent formability, toughness, and general corrosion resistance. This grade is ideal for heavy-section welded components that cannot be heat-treated after fabrication. It offers consistent performance in chemical, pharmaceutical, and food-processing equipment where corrosion after welding is a critical concern.

Chemical Composition

C ≤ 0.03, Cr 18.0–20.0, Ni 8.0–12.0, Mn ≤ 2.00, Si ≤ 1.00, P ≤ 0.045, S ≤ 0.030

Mechanical Properties

Tensile Strength ≥ 485 MPaYield Strength ≥ 170 MPaElongation ≥ 40%Hardness ≤ 201 HB

Advantages

Superior intergranular corrosion resistance after welding compared to S30400; excellent weldability without sensitization; good ductility and fabrication characteristics.

Applications

Welded pressure vessels, chemical tanks, piping systems, pharmaceutical equipment, and structural weldments.

Equivalent Grades

AISI 304L, EN 1.4307, GB 022Cr19Ni10

Stainless Steel Suppliers

If you have project requirements for stainless steel, we welcome your order. GNEE has a large inventory of popular products for you to choose from. It can be processed into various practical product forms, including plates, coils, tubes, bars, wires, etc. For detailed chemical composition information and free samples, please contact our factory immediately. We offer competitive prices and excellent service.Email: info@gneestainless.com

 

Testing and Documentation: Factory test certificate, EN 10204 3.1, chemical report, mechanical report, destructive testing report, non-destructive testing report, PMI test report, visual inspection report, third-party inspection report, NABL certified laboratory report.
Packaging: Wooden crate packaging, bubble wrap packaging, steel strapping, or packaging according to customer requirements.