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 الخصائص الفيزيائية والكيميائية:

الخصائص الفيزيائية

مظهر:

It usually presents a silvery white metallic color, with a smooth surface and high gloss. Different surface effects can be obtained through different surface treatment processes, such as mirror polishing, brushing, etc. 316L stainless steel pipes are often used in applications where corrosion resistance and aesthetic appeal are highly valued.

كثافة:

The density is generally around 7.98g/cm³. For example, the density of 316L stainless steel pipe is approximately 7.98g/cm³, which is slightly higher than ordinary carbon steel.

نقطة الانصهار:

The melting point is relatively high, generally around 1375-1400℃. This makes it suitable for use in high-temperature environments, ensuring stability even under extreme conditions.

معامل التمدد الحراري:

The coefficient of thermal expansion is relatively small. In the range of room temperature to 100℃, the coefficient of thermal expansion of 316L stainless steel is about 16.0×10⁻⁶/℃. This feature enables it to maintain good dimensional stability in environments with significant temperature changes.

الموصلية الحرارية:

The thermal conductivity is poor, and its thermal conductivity coefficient is about 16.3W/(m・K), which is much lower than that of copper, aluminum, and other metals, providing certain thermal insulation performance.

الموصلية الكهربائية:

It has certain electrical conductivity, but the conductivity is relatively low. The conductivity of 316L stainless steel is about 1.4×10⁶ S/m, which is only about 4% of the conductivity of copper.

الخصائص الكيميائية

مقاومة التآكل:

This is one of the most important chemical properties of 316L stainless steel pipes. A dense passivation film forms on its surface, preventing oxygen, water, and other corrosive agents from contacting the metal matrix, thereby effectively resisting corrosion. For example, 316L stainless steel exhibits excellent corrosion resistance in environments such as marine atmospheres, chlorides, and weak acids or alkalis. Its molybdenum content enhances resistance to chloride ion corrosion, making it ideal for marine and chemical processing environments.

مضادات الأكسدة:

316L stainless steel pipes have excellent oxidation resistance at both room temperature and higher temperatures. They can withstand high-temperature environments without being easily oxidized, making them suitable for applications like heat exchangers and exhaust systems.

الاستقرار الكيميائي:

In general chemical media, 316L stainless steel pipes exhibit high chemical stability and do not react easily with common chemicals. However, in some specific strong corrosive media, such as concentrated nitric acid or hydrofluoric acid, their corrosion resistance may be affected.

التخميل:

After exposure to air or undergoing passivation treatment, a passivation film forms on the surface of 316L stainless steel pipes. This passivation film enhances corrosion resistance and oxidation resistance. Passivation treatment typically involves immersing the stainless steel pipe in a solution containing an oxidant, such as nitric acid or potassium dichromate, to promote the formation and repair of the passivation film.

طلب:

316L stainless steel pipes are widely used in various fields due to their excellent corrosion resistance, high strength, and good processing performance. In the medical field, they are used to manufacture surgical instruments, implants, and other equipment, ensuring sterility and biocompatibility. In the building and construction industry, they are used for plumbing, handrails, and decorative structures, combining beauty with durability. In mechanical manufacturing, they are used in key components such as hydraulic systems and high-pressure piping to ensure stable operation. In the food processing industry, they are used to manufacture pipelines and containers that meet strict hygiene standards. Additionally, in chemical equipment, marine engineering, and electronic appliances, 316L stainless steel pipes are indispensable, as they adapt well to complex working environments.