Introduction
The ASME SA213 TP904L Seamless Tube is a high-alloy, low-carbon austenitic stainless steel tube engineered for highly corrosive environments. With additions of nickel (≈25%), molybdenum (≈4.5%), and copper (≈1.5%), 904L provides superior resistance to strong reducing acids, seawater, and chloride-induced corrosion.
DLSS supplied 57×2.0MW×1700MM seamless tubes, manufactured to ASME SA213, with bright annealed surface, 100% heat treatment (HT), and 100% eddy current testing (ET). Thanks to optimized production, delivery was completed in 20 days, meeting urgent project requirements.
Key Features
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Material: ASME SA213 TP904L (UNS N08904)
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Type: Seamless Tube (SMLS)
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Size: 57 mm OD × 2.0 mm WT × 1700 mm Length
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Surface Finish: Bright Annealed (BA) – smooth, clean, and corrosion-resistant
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Testing: 100% Heat Treatment (HT) + 100% Eddy Current Testing (ET)
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Delivery: Fast production cycle – 20 days
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Corrosion Resistance: Excellent against sulfuric acid, seawater, and chlorides
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Strength: High tensile and yield strength compared to standard 316L
Specifications
| Item | Details |
|---|---|
| Standard | ASME SA213 |
| Material | TP904L Stainless Steel (UNS N08904) |
| Type | Seamless Tube |
| Size | 57×2.0MW×1700MM |
| Surface Finish | Bright Annealed |
| Testing | 100% HT + 100% ET |
| Delivery Time | 20 Days |
| Applications | Chemical Plants, Marine Systems, Heat Exchangers, Oil & Gas, Power Plants |
Advantages of TP904L
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High Corrosion Resistance – withstands aggressive acids (H₂SO₄, HCl, HF).
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Copper Addition – improves resistance to sulfuric acid attack.
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Molybdenum & Nickel Content – resists pitting, crevice corrosion, and SCC.
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Low Carbon Content – prevents intergranular corrosion during welding.
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Bright Annealed Finish – reduces contamination risk, ensures smooth fluid flow.
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Fast Delivery – DLSS can produce and deliver in 20 days to meet project schedules.
Applications
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Chemical & Petrochemical Industry – sulfuric acid production, phosphoric acid plants.
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Oil & Gas – refinery piping, offshore platforms, subsea flowlines.
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Marine Engineering – seawater cooling, desalination plants.
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Power Generation – boilers, condensers, heat exchanger tubing.
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Pharmaceutical & Food Industry – hygienic and corrosion-resistant piping.
Quality Assurance
Every TP904L tube undergoes rigorous quality control:
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100% HT – ensures correct grain structure and toughness.
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100% ET – detects surface cracks and imperfections.
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PMI, Hydro, Dimensional Checks – ensure compliance with ASME standards.
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Third-Party Inspection – SGS, BV, TUV, LR certification available.
FAQ
Q1: Why choose TP904L instead of 316L/317L?
A1: 904L has higher nickel, molybdenum, and copper content, making it far more resistant to strong reducing acids and chloride-rich environments than 316L/317L.
Q2: What is the benefit of Bright Annealed surface?
A2: BA finish provides a smooth, oxide-free surface that improves corrosion resistance and reduces risk of contamination in critical services.
Q3: How fast can DLSS deliver TP904L tubes?
A3: With streamlined production, DLSS can deliver within 20 days, even for custom sizes and urgent orders.
Why Choose DLSS?
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Specialized in high-alloy stainless steel tubes including 904L, 6Mo, duplex, and nickel alloys.
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30+ years of experience serving chemical, marine, and oil & gas industries.
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Comprehensive testing & certifications to meet project requirements.
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Reliable delivery with global references in more than 40 countries.
