S32550 Super Duplex Stainless Steel Pipe for High-Pressure Corrosive Service

Selecting pipe for aggressive process environments is rarely just about corrosion resistance. Many buyers also need higher mechanical strength, reliable weldability and long-term service stability. S32550 Super Duplex Stainless Steel Pipe offers an excellent balance of these properties, making it suitable for offshore pipelines, seawater systems and chemical processing equipment. As an experienced China S32550 Super Duplex Stainless Steel Pipe Supplier, we provide customized sizes, complete inspection reports and worldwide export delivery.

Product Specifications

Item	Details
Grade	S32550 Super Duplex Stainless Steel
Standards	ASTM A790, ASTM A928, ASTM A789
Outside Diameter	6–914 mm
Wall Thickness	0.8–50 mm
Length	5.8 m, 6 m or Customized
Pipe Type	Seamless & Welded
Surface	Pickled, Annealed, Polished
Inspection	PMI, Hydrostatic Test, UT, Eddy Current Test

Element	Content (%)
Carbon (C)	≤0.030
Silicon (Si)	≤1.00
Manganese (Mn)	≤1.50
Phosphorus (P)	≤0.035
Sulfur (S)	≤0.020
Chromium (Cr)	24.0–27.0
Nickel (Ni)	4.5–6.5
Molybdenum (Mo)	2.9–3.9
Nitrogen (N)	0.10–0.25
Copper (Cu)	1.5–2.5

Why Choose S32550 Pipe?

Excellent Resistance to Chloride Corrosion

With a high chromium, molybdenum and nitrogen content, S32550 offers excellent resistance to pitting, crevice corrosion and chloride stress corrosion cracking, making it suitable for seawater and salt-rich process media.

High Strength Helps Reduce System Weight

The minimum yield strength reaches approximately 550 MPa, nearly twice that of standard 316L stainless steel. In many pressure piping projects, this allows thinner wall designs while maintaining the required strength.

Reliable Performance Under Pressure

S32550 maintains stable mechanical properties under high-pressure operating conditions and is commonly selected for offshore piping, pressure vessels and process lines where both strength and corrosion resistance are required.

Good Weldability for Fabrication

When proper welding procedures are followed, S32550 provides sound welded joints with balanced duplex microstructure, helping reduce fabrication risks for large piping projects.