Product details:

Physical and chemical properties:

1. Physical properties

Density: The density of stainless steel bars varies depending on the composition, generally around 7.7 – 8.0g/cm³. For example, the density of 304 stainless steel bars is about 7.93g/cm³, which makes it convenient to convert mass and volume and estimate weight in practical applications.

Thermal conductivity: The thermal conductivity of stainless steel bars is relatively low, about 12 – 30W/(m·K). This means that it is not a good thermal conductor, which has certain advantages in some occasions where insulation is required, such as in the application of support components of high-temperature equipment, which can reduce heat conduction. – **Coefficient of thermal expansion**: Its coefficient of thermal expansion is generally 10 – 20×10⁻⁶/℃ (different for different compositions and temperature ranges). This means that when the temperature changes, the size of the stainless steel bar will change accordingly, and this factor needs to be considered in applications with high dimensional accuracy requirements such as precision instruments.

Magnetism: Some stainless steel bars, such as martensitic stainless steel, are magnetic, while austenitic stainless steel bars (such as 304) are usually non-magnetic or weakly magnetic. In some electronic devices or applications that are sensitive to magnetic fields, magnetism is an important consideration. – Hardness: Hardness varies depending on the type and heat treatment state. For example, martensitic stainless steel bars that have been heat treated such as quenching have a higher hardness of about HRC50 and can be used for wear-resistant mechanical parts. Austenitic stainless steel bars have a relatively low hardness but are easy to process and shape.

Strength: Stainless steel bars have high strength, including yield strength and tensile strength. For example, the tensile strength of 304 stainless steel bars can reach more than 500MPa, which enables it to withstand large tensile forces and can be used in areas with high strength requirements such as building structures and mechanical transmission.

Ductility: It has good ductility and can be processed by forging, rolling, stretching, etc. It can be drawn into thin wires for the manufacture of stainless steel wire products, or processed into various complex parts, such as in machinery manufacturing, automotive parts, etc.

2. Chemical properties

Corrosion resistance: Stainless steel bars contain chromium, which can form a dense protective film of chromium oxide (Cr₂O₃) on its surface. This makes it have good corrosion resistance in the atmosphere, fresh water, seawater and other environments. Different types of stainless steel bars have different corrosion resistance. For example, 316 stainless steel bars have stronger corrosion resistance in environments containing chloride ions (such as seawater) and some highly corrosive chemical media due to the molybdenum element.

Antioxidation: In high temperature environments, stainless steel bars can maintain good antioxidation properties. Within a certain temperature range, the protective film on its surface can prevent oxygen from further oxidizing the internal metal. For example, in the components of high-temperature furnaces, stainless steel bars can withstand high-temperature oxidation without being rapidly corroded.

Chemical stability: In general chemical environments, stainless steel bars are relatively stable. It does not react violently with common chemicals (such as organic acids in food and some mild chemical reagents in chemical production), so it is widely used in food processing, chemical equipment and other fields.

Application:

Stainless steel rods have a wide range of application fields. In machinery manufacturing, it is an ideal material for the manufacture of shafts, bolts, nuts and other parts. It ensures the efficient operation of machinery with good strength and wear resistance. In the construction industry, it is used for structural support, decorative railings, etc. Its corrosion resistance can cope with various climatic environments, and it is both beautiful and stable. In the chemical industry, it can make reactor internals and pipeline connectors to withstand a variety of chemical media erosion. In food processing, it is used for key components of production equipment and meets health and safety requirements. It also plays an important role in automobile manufacturing, aerospace and other industries to help improve product performance and quality assurance.