304 Stainless Steel Bar ASTM A276 Hot Rolled Black Surface SS Bar Diameter 6 - 350mm
The 304 stainless steel bar, also known as UNS S30400, is a widely recognized and frequently utilized member of the stainless steel family. It belongs to the austenitic alloy category, characterized by its composition of iron, 18% chromium, and 8% nickel. The ‘L’ designation in 304/L signifies a lower carbon content, enhancing its corrosion resistance during welding. This material boasts exceptional qualities such as good strength, formability, and remarkable corrosion resistance, making it ideal for a wide range of applications where durability and anti-corrosive properties are crucial. It’s a cost-effective and versatile choice suitable for various industries.
304 | C % | Si % | Mn % | P % | S % | Ni % | Cr % | Mo % | N % | Cu % |
ASTM | 0.08 | 0.75 | 2.00 | 0.045 | 0.030 | 8.0 – 10.5 | 18.0 – 20.0 | – | 0.10 | – |
DIN/EN | 0,07 | 1,00 | 2,00 | 0,045 | 0,015 | 8,0 – 10,5 | 17,5 – 19,5 | – | 0,10 | – |
JIS | 0.08 | 1.00 | 2.00 | 0.045 | 0.030 | 8.0 – 10.5 | 18.0 – 20.0 | – | – | – |
GB | 0.08 | 1.00 | 2.00 | 0.045 | 0.030 | 8.0 – 10.0 | 18.0 – 20. 0 | – | – | – |
304 | Density (g/cm³) | Melting point (℃) | Thermal conductivity | Coefficient of thermal expansion (10^-6/K) | Elastic Modulus(GPa) | Poisson’s Ratio |
ASTM | 7.93 | 1398-1454 | 16.2-24.9 | 17.3-17.8 | 200 | 0.3 |
JIS | 7.93 | 1398-1454 | 16.2-24.9 | 17.3-17.8 | 193 | 0.3 |
EN | 7.9 | 1400-1450 | 15-21.5 | 17.0-17.5 | 193 | 0.3 |
GB | 7.9 | 1398-1454 | 16.2-24.9 | 17.3-17.8 | 193 | 0.3 |
304 | Y.S./Mpa ≥ | T.S./Mpa ≥ | E.L./% ≥ | HB ≤ | HRB ≤ | HBW ≤ | HV ≤ |
ASTM | 205 | 515 | 40 | – | 92 | 201 | – |
JIS | 205 | 520 | 40 | 187 | 90 | – | 200 |
GB | 205 | 515 | 40 | – | 92 | 201 | 210 |
304 stainless steel, particularly the variant denoted as 304/L with its lower carbon content, exhibits exceptional corrosion protection properties. This attribute is especially prominent during welding processes.
The significance of this corrosion protection lies in the prevention of localized corrosion, such as pitting and crevice corrosion, which can occur in aggressive environments. The reduced carbon content minimizes the formation of carbides, thereby preserving the material’s corrosion resistance.
In practical terms, this means that 304 stainless steel can withstand exposure to various corrosive elements, making it suitable for applications in industries where resistance to rust and corrosion is crucial. Whether it’s facing chemical solutions, acidic environments, or exposure to moisture, the 304 stainless steel bar’s corrosion protection ensures its durability and longevity.
This feature makes 304 stainless steel an ideal choice for a wide array of applications, from kitchen appliances and architectural components to industrial equipment and structural supports, where maintaining structural integrity in corrosive conditions is imperative.
The 304 stainless steel bar is widely recognized and acclaimed in various industries for its exceptional attributes. It has earned its reputation as one of the most familiar and frequently used alloys within the stainless steel family.
This recognition is attributed to its versatility and reliability across a broad spectrum of applications. Engineers, manufacturers, and designers across industries acknowledge the 304 stainless steel bar for its impressive combination of strength, formability, and outstanding corrosion resistance.
Moreover, its wide recognition extends to its ease of fabrication, making it a preferred choice for countless projects and products. Whether in the construction of architectural components, manufacturing of kitchen appliances, or crafting industrial equipment, the 304 stainless steel bar is a trusted and widely embraced material.
This widespread recognition is not only a testament to its performance but also a reflection of its cost-effectiveness. Industries have come to rely on 304 stainless steel for its ability to provide durable support, corrosion resistance, and excellent value, making it a top choice in numerous applications.
The composition of the 304 stainless steel bar, also known as UNS S30400, is primarily characterized by its austenitic structure. This alloy is composed of a precise combination of elements that contribute to its exceptional properties:
Iron (Fe): Iron is the base metal of the alloy, forming the structural foundation.
Chromium (Cr): With a chromium content of approximately 18%, 304 stainless steel gains its corrosion-resistant properties. Chromium forms a passive oxide layer on the surface, safeguarding against rust and corrosion.
Nickel (Ni): Nickel, constituting around 8% of the alloy, enhances its corrosion resistance and provides stability in various environments.
Carbon (C): The ‘L’ in 304/L signifies a lower carbon content compared to standard 304 stainless steel. This reduced carbon content minimizes the risk of sensitization and intergranular corrosion during welding, making it suitable for welded applications.
Manganese (Mn): Manganese is present in small amounts, contributing to the alloy’s overall strength and workability.
Silicon (Si): Silicon aids in deoxidizing the steel and enhancing its resistance to scaling at high temperatures.
Phosphorus (P): Phosphorus is present in minimal quantities and primarily serves as an impurity control.
Sulfur (S): Sulfur is also present in trace amounts and helps improve machinability.
This precisely balanced composition is the key to the 304 stainless steel bar’s outstanding corrosion resistance, mechanical strength, formability, and weldability. It is this harmonious blend of elements that makes it a highly sought-after material across various industries.