High-Alloy Urea-Grade Stainless Steel for Chloride & Carbamate Environments
What is TP310MoLN Seamless Stainless Steel Tube?
SeamlessTP310MoLN stainless steel tube (UNS S31050 / W.Nr. 1.4466) is a high-alloy, nitrogen-enhanced austenitic stainless steel specifically developed for extreme corrosion environments, particularly in urea synthesis and chloride-rich systems.
Manufactured via seamless hot extrusion and precision cold finishing, the product ensures:
- Uniform grain structure
- No weld seam defects
- Excellent resistance to localized corrosion
- Superior pressure and mechanical integrity
The “MoLN” designation represents:
- Mo (Molybdenum) → Enhanced resistance to pitting and crevice corrosion
- L (Low Carbon, ≤0.020%) → Prevents sensitization and intergranular corrosion
- N (Nitrogen) → Improves strength, stability, and PREN value
TP310MoLN is widely recognized as a premium urea-grade stainless steel tube, especially for ammonium carbamate service environments.
Key Features & Technical Advantages
Exceptional Urea Carbamate Resistance
Designed for urea synthesis plants, TP310MoLN provides outstanding resistance to:
- Ammonium carbamate
- Urea solutions
- High-pressure CO₂/NH₃environments
Superior Corrosion Resistance (High PREN)
High alloy content significantly improves corrosion resistance:
- Chromium: ~25%
- Molybdenum: 2.5% – 3.5%
- Nitrogen addition enhances stability
Result:High PREN (Pitting Resistance Equivalent Number), far exceeding 316L and 310.
Excellent Resistance to SCC (Stress Corrosion Cracking)
The combined effect of high Nickel (~22%) and Nitrogenprovides:
- Strong resistance to chloride-induced SCC
- Reliable performance in marine, offshore, and desalination systems
High Mechanical Strength
Nitrogen strengthening significantly increases:
- Yield strength
- Load-bearing capacity
- Design stress limits
Allowsthinner wall design, reducing system weight and cost.
Fully Austenitic & Non-Magnetic
- Stable austenitic microstructure
- Excellent cold working capability
- Non-magnetic in annealed condition
Product Specifications and Data
To provide a comprehensive overview of this high-performance material, here are the detailed technical specifications and performance data for Stainless Steel TP310MoLN .
The composition of Stainless Steel TP310MoLN is carefully balanced to achieve its superior corrosion resistance and high strength.
Stainless Steel TP310MoLN is specifically designed to maintain its strength and shape in high-stress, corrosive environments.
These physical properties highlight the material’s ability to perform reliably under a wide range of conditions.
Common Industrial Applications
TP310MoLN seamless tubes are widely used in critical and aggressive environments:
Urea & Fertilizer Industry
- Urea strippers
- Carbamate condensers
- High-pressure synthesis loops
Oil & Gas / Offshore
- Chemical injection lines
- Manifolds and risers
- Chloride-rich service systems
Marine & Desalination
- Seawater heat exchangers
- Desalination plant piping
Pulp & Paper
- Bleaching systems
- Digester components
Quality Assurance & Certification
Every TP310MoLN tube is supplied with full quality documentation:
Certifications
- EN 10204 3.1 / 3.2 Material Test Certificates (MTC)
Inspection & Testing
- 100% PMI (Positive Material Identification)
- Ultrasonic Testing (UT)
- Eddy Current Testing (ET)
- Hydrostatic Testing
Advanced Testing
- Huey Test (ASTM A262 Practice C)
- Intergranular Corrosion (IGC) Test
- Grain size analysis
- Mechanical property verification
Third-Party Inspection
- ABS
- DNV
- BV (Bureau Veritas)
- TÜV
- SGS
