Our corrosion resistant stainless steel seamless pipes are specifically manufactured for industries where standard carbon steel or lower-grade stainless steel cannot survive aggressive chemical environments. Available in ASTM A312 TP316L, TP904L, and Duplex UNS S32205 (2205), these pipes provide exceptional resistance to pitting, crevice corrosion, stress corrosion cracking (SCC), and intergranular attack across a wide range of temperatures, pH levels, and chloride concentrations.

Product Specifications

Corrosion Resistance by Grade

Application Scenarios

Chemical Processing

Reactor piping, transfer lines, and heat exchanger connections in sulfuric acid, phosphoric acid, and mixed acid environments. 904L is the preferred grade for concentrated sulfuric acid service up to 98% at moderate temperatures. Duplex 2205 handles chloride-laden process streams where 316L would suffer SCC within months.

Marine and Offshore

Seawater cooling lines, ballast piping, firewater ring mains, and topside process piping on offshore platforms and FPSO vessels. Duplex 2205 combines high strength (yield ≥450 MPa - roughly double that of 316L) with excellent seawater corrosion resistance, allowing thinner wall designs and reduced structural weight.

Desalination Plants

High-pressure brine piping, evaporator feed lines, and reject lines in both MSF (Multi-Stage Flash) and SWRO (Seawater Reverse Osmosis) facilities. 904L and 2205 are both widely specified, with 2205 increasingly preferred due to its higher strength-to-weight ratio and lower nickel content providing greater price stability.

Pharmaceutical and Food Processing

316L remains the industry workhorse for WFI (Water for Injection) loops, CIP (Clean-in-Place) piping, and sterile transfer lines where the corrosion challenge is moderate but surface finish and cleanability are critical. All pipes undergo electropolishing to Ra ≤0.4 μm upon request.

Pulp and Paper

Bleaching plant piping, digester blow lines, and chlorine dioxide handling systems. Both 904L and Duplex 2205 are specified where 316L has proven insufficient - particularly in chlorine dioxide stages where the oxidizing environment rapidly attacks lower-alloy stainless steels.

Mechanical Properties

Quality Assurance

• Eddy Current Testing (ECT): 100% of pipes tested per ASTM E426 with reference notch depth per ASTM A312
• Ultrasonic Testing (UT): Available per ASTM A388 for heavy-wall pipes (>Schedule 80)
• Hydrostatic Test: Each pipe tested at 1.5 times design pressure with minimum 5-second hold
• PMI (Positive Material Identification): 100% alloy verification via XRF or OES spectrometer
• Intergranular Corrosion Test: ASTM A262 Practice E (Strauss test) for 316L; Practice C (Huey test) available for 904L
• Ferrite Content: Measured on Duplex 2205 per ISO 8249, controlled at 35-55% for optimal corrosion-mechanical balance
• Mill Test Reports: EN 10204 Type 3.1 provided with every shipment; Type 3.2 available upon request with third-party inspection

FAQ

Need help selecting the right corrosion resistant pipe for your process? Send us your fluid chemistry, operating temperature, and pressure - our metallurgists will provide a recommendation within 24 hours.