904L Stainless Steel Pipe Description

Grade 904L is an unstable low carbon high alloy austenitic stainless steel. The addition of copper to this grade greatly increases its resistance to strong reducing acids, especially sulfuric acid. It is also highly resistant to chloride attack, including pitting/crevice corrosion and stress corrosion cracking.

Product Parameters

Chemical Composition

Mechanical Properties

Physical Performance

904L stainless steel pipe is a high-performance, austenitic stainless steel known for its exceptional corrosion resistance and durability in demanding environments. As a low-carbon, high-alloy steel, 904L features the addition of copper, which significantly enhances its resistance to strong reducing acids, particularly sulfuric acid. This unique composition also provides outstanding resistance to chloride-induced corrosion, including pitting, crevice corrosion, and stress corrosion cracking, making it ideal for applications in harsh chemical and marine environments.

The 904L stainless steel pipe is available in various shapes and sizes to meet diverse industrial requirements. Round tubes range from 4mm to 200mm, square tubes from 1010mm to 100100mm, and rectangular tubes from 1020mm to 50100mm. Wall thickness can be customized from 0.6mm to 6.0mm, and pipe lengths can be tailored from 1 to 6 meters to suit specific engineering needs. The pipes are manufactured according to international standards, including ASTM, AISI, JIS, GB, DIN, and EN, ensuring global compatibility and high-quality performance. Surface finish options include black, bright polished, rough turning, matt treatment, No. 4, and BA, providing both functional and aesthetic versatility for various industrial applications.

904L stainless steel pipes are produced using advanced hot and cold rolling techniques, with precise edge processing such as edging and trimming to facilitate seamless installation and fabrication. The chemical composition includes a maximum of 0.02% carbon, 1.0% silicon, 2.0% manganese, 19.0–23.0% chromium, 23.0–28.0% nickel, 4.0–5.0% molybdenum, and minimal sulfur and phosphorus, providing a balanced combination of mechanical strength, corrosion resistance, and durability.

Mechanically, 904L stainless steel pipes exhibit a tensile strength of ≥490 MPa, a yield strength of ≥220 MPa, and an elongation of ≥35%, with hardness up to 90HRB. These properties allow the pipes to withstand high stress and pressure without deformation, making them suitable for critical industrial applications. Physical characteristics, including a density of 8.0 g/cm³, modulus of elasticity of 195 GPa, thermal expansion coefficient of 15.5×10⁻⁶/°C, thermal conductivity of 12.0 W/m·K, and resistivity of 94 μΩ·cm, further enhance the material’s reliability under a range of thermal and mechanical conditions.

The versatility of 904L stainless steel pipes makes them widely applicable across multiple industries. They are commonly used in food processing, textile manufacturing, breweries, water treatment facilities, oil and gas processing, fertilizer and pesticide production, chemical processing, construction, pharmaceuticals, and automotive components. Their resistance to aggressive chemicals, high temperatures, and chloride environments ensures long-term performance and safety, even in the most challenging conditions.

Certified by ISO, SGS, and BV, 904L stainless steel pipes meet international quality and safety standards, providing assurance of consistent performance and reliability. The material is also highly weldable and machinable, allowing customization for complex industrial components and engineering designs. Low carbon content reduces the risk of carbide precipitation during welding, maintaining excellent corrosion resistance and structural integrity.

Overall, 904L stainless steel pipes offer a combination of superior corrosion resistance, mechanical strength, and durability, making them an ideal solution for demanding industrial applications. Their adaptability, availability in various sizes and finishes, and compliance with international standards make them indispensable for industries requiring high-performance materials. Whether for chemical processing, marine environments, or high-temperature applications, 904L stainless steel pipes deliver reliable performance, longevity, and safety in all operating conditions.