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321 welded steel pipe is manufactured using austenitic stainless steel (grade: UNS S32100 / 1.4541) through a welding process.
Core Material Characteristics and Advantages
Excellent Intergranular Corrosion Resistance:
The most prominent advantage of 321 stainless steel is that the addition of titanium (Ti) combines with carbon (C) to form stable titanium carbide (TiC). This effectively prevents carbon from combining with chromium to form chromium carbide that precipitates at grain boundaries, thereby avoiding the formation of "chromium-depleted zones" and fundamentally eliminating intergranular corrosion. This is particularly important after welding or heat treatment.
Outstanding High-Temperature Performance:
In high-temperature environments (maximum service temperature up to approximately 815°C), 321 stainless steel maintains high strength and oxidation resistance, and exhibits excellent creep resistance. The stabilizing effect of titanium ensures structural stability even under long-term use at high temperatures.
Excellent Corrosion Resistance:
It possesses the excellent corrosion resistance common to austenitic stainless steels, resisting corrosion from the atmosphere, fresh water, various acids, alkalis, and salt solutions. It offers particularly outstanding resistance to oxidizing acids (such as nitric acid).
Weldability:
Weldability is excellent. However, it should be noted that to maximize its resistance to intergranular corrosion, low-carbon welding consumables (such as ER321L) are recommended.
Product Features: 321 welded steel pipe
Production process: Coiled and welded from sheet metal
Wall thickness uniformity is excellent, especially for large diameter pipes.
Size range: Small to large diameter, thin-walled pipes
Application options: Commonly used in cost-sensitive, medium- and low-pressure, large-diameter applications.
For most high-temperature corrosive environments, high-quality welding processes and product quality fully meet the requirements and are more economical. Seamless steel pipe is only preferred for applications with extremely high pressures or stringent reliability requirements.
321 welded steel pipe, thanks to its titanium stabilization and excellent intergranular corrosion resistance and high-temperature performance, has become a key material in industries such as petrochemicals, thermal power generation, and others. Its mature welding process and controlled quality offer significant advantages over seamless pipe in terms of cost-effectiveness and dimensional flexibility (especially in large diameters). When choosing, be sure to confirm the manufacturer's production qualifications, quality control system, and whether the product complies with relevant international standards (such as ASTM).
321 welded steel pipe is manufactured using austenitic stainless steel (grade: UNS S32100 / 1.4541) through a welding process.
Core Material Characteristics and Advantages
Excellent Intergranular Corrosion Resistance:
The most prominent advantage of 321 stainless steel is that the addition of titanium (Ti) combines with carbon (C) to form stable titanium carbide (TiC). This effectively prevents carbon from combining with chromium to form chromium carbide that precipitates at grain boundaries, thereby avoiding the formation of "chromium-depleted zones" and fundamentally eliminating intergranular corrosion. This is particularly important after welding or heat treatment.
Outstanding High-Temperature Performance:
In high-temperature environments (maximum service temperature up to approximately 815°C), 321 stainless steel maintains high strength and oxidation resistance, and exhibits excellent creep resistance. The stabilizing effect of titanium ensures structural stability even under long-term use at high temperatures.
Excellent Corrosion Resistance:
It possesses the excellent corrosion resistance common to austenitic stainless steels, resisting corrosion from the atmosphere, fresh water, various acids, alkalis, and salt solutions. It offers particularly outstanding resistance to oxidizing acids (such as nitric acid).
Weldability:
Weldability is excellent. However, it should be noted that to maximize its resistance to intergranular corrosion, low-carbon welding consumables (such as ER321L) are recommended.
Product Features: 321 welded steel pipe
Production process: Coiled and welded from sheet metal
Wall thickness uniformity is excellent, especially for large diameter pipes.
Size range: Small to large diameter, thin-walled pipes
Application options: Commonly used in cost-sensitive, medium- and low-pressure, large-diameter applications.
For most high-temperature corrosive environments, high-quality welding processes and product quality fully meet the requirements and are more economical. Seamless steel pipe is only preferred for applications with extremely high pressures or stringent reliability requirements.
321 welded steel pipe, thanks to its titanium stabilization and excellent intergranular corrosion resistance and high-temperature performance, has become a key material in industries such as petrochemicals, thermal power generation, and others. Its mature welding process and controlled quality offer significant advantages over seamless pipe in terms of cost-effectiveness and dimensional flexibility (especially in large diameters). When choosing, be sure to confirm the manufacturer's production qualifications, quality control system, and whether the product complies with relevant international standards (such as ASTM).
