The JIS G4304 SUS309S hot-rolled stainless steel plate and coil is a highly sought-after material in various industries due to its exceptional properties and performance. This article aims to provide a comprehensive overview of the SUS309S material, highlighting its chemical composition, mechanical properties, heat treatment status, dimensional ranges, impact test requirements, key application areas, and specific supply cases by TJC Steel Group.

Chemical Composition

The SUS309S stainless steel is characterized by its high chromium and nickel content, which ensures excellent corrosion resistance and oxidation resistance. The chemical composition typically includes chromium (Cr) in the range of 22.0-24.0%, nickel (Ni) between 12.0-15.0%, carbon (C) not exceeding 0.08%, silicon (Si) not exceeding 1.00%, manganese (Mn) not exceeding 2.00%, sulfur (S) not exceeding 0.03%, and phosphorus (P) not exceeding 0.045%. The material may also contain trace amounts of molybdenum (Mo), titanium (Ti), and niobium (Nb) to further enhance its high-temperature properties and corrosion resistance.

Mechanical Properties

SUS309S stainless steel exhibits remarkable mechanical properties, including a minimum tensile strength of 520 MPa and a minimum yield strength of 205 MPa. It possesses excellent ductility, with a minimum elongation of 40% and a minimum reduction of area of 50%. The hardness of the material falls within the range of ≤187HB, ≤90HRB, and ≤200HV.

Heat Treatment Status

The SUS309S stainless steel is typically supplied in a heat-treated condition. The heat treatment specifications involve solid solution treatment at a temperature range of 920-1150°C with rapid cooling. Additionally, stabilization treatment can be performed at a temperature of 850-930°C, if specified by the customer. The resulting material exhibits a characteristic austenitic microstructure.

Dimensional Ranges

JIS G4304 specifies the dimensional tolerances for hot-rolled stainless steel plates and coils. The SUS309S material is available in a wide range of thicknesses, widths, and lengths, tailored to meet the specific requirements of various applications.

Impact Test

The SUS309S stainless steel undergoes impact testing to ensure its resistance to low-temperature brittleness. The test involves exposing the material to a specified low temperature and then subjecting it to a sudden impact load. The material must meet the specified impact energy requirements to be considered suitable for use in low-temperature environments.

Key Application Areas

The SUS309S stainless steel finds extensive application in high-temperature and corrosive environments. It is commonly used in the manufacture of exhaust systems, heat treatment furnaces, heat exchangers, and other components that require excellent resistance to oxidation and corrosion. The material's high strength and ductility also make it suitable for use in the petrochemical, chemical, and power generation industries.

TJC Steel Group Supply Cases

As a leading supplier of stainless steel products, TJC Steel Group has extensive experience in providing SUS309S hot-rolled stainless steel plate and coil to various industries. The company's supply cases include the manufacture of exhaust systems for automotive and industrial applications, heat treatment furnaces for the metalworking industry, and heat exchangers for the petrochemical sector. TJC Steel Group's ability to provide customized solutions and meet stringent quality requirements has earned it a reputation as a trusted supplier of SUS309S stainless steel.