Stainless Steel Pipes | ASTM TP 904L/317L Custom Sizes

Stainless Steel Pipes | ASTM TP 904L/317L Custom Sizes

Product Overview

Our ASTM TP 904L/317L stainless steel pipes are engineered for extreme corrosion resistance, mechanical durability, and versatility in custom dimensions. Designed for harsh environments like chemical processing, marine engineering, and offshore oil & gas, these pipes comply with schedule 40s stainless steel pipe and shed 10 stainless steel pipe standards, ensuring reliability in high-pressure and high-temperature systems. With a seamless or welded manufacturing process, they meet ASTM, ASME, and EN specifications while offering a polished or pickled surface finish for hygiene-critical industries.

Technical Specifications

Key Mechanical Properties

Tensile Strength

• TP 904L: ≥520 MPa | TP 317L: ≥480 MPa
  The high tensile strength of TP 904L makes it ideal for sulfuric and phosphoric acid transport systems, while TP 317L excels in chloride-rich environments like seawater cooling systems. Both grades outperform pipe stainless steel 316 in stress corrosion cracking (SCC) resistance.

Bending Strength

• TP 904L/317L: Exceptional ductility allows cold bending up to 180° without cracking. Compatible with hydraulic benders for custom shapes in shed 10 stainless steel pipe installations.

Material Properties & Advantages

1. Corrosion Resistance

   • TP 904L: Contains 4–5% molybdenum and 1–2% copper, resisting sulfuric acid, chloride pitting, and crevice corrosion.
   • TP 317L: Enhanced with 3–4% molybdenum for superior performance in acidic and saltwater environments.

2. Temperature Stability

   • TP 904L: Operates reliably up to 400°C, ideal for heat exchangers and flue gas systems.
   • TP 317L: Stable up to 870°C, suitable for boiler tubes and high-temperature reactors.

3. Hygienic Design

   • Electropolished surfaces (optional) minimize bacterial adhesion, meeting FDA and EHEDG standards for food and pharmaceutical applications.

Weight Calculation Formula

Weight (kg/m) = (OD – WT) × WT × 0.02491
Example: For a schedule 40s stainless steel pipe (OD: 168.3 mm, WT: 7.11 mm):
(168.3 – 7.11) × 7.11 × 0.02491 = 27.6 kg/m.

Why Stainless Steel Pipes Corrode?

Despite their corrosion-resistant properties, stainless steel can degrade under specific conditions:

1. Chloride Exposure: Prolonged contact with seawater, bleach, or de-icing salts induces pitting, especially in stagnant or low-pH environments.
2. Galvanic Corrosion: Direct contact with carbon steel, copper, or aluminum in conductive fluids accelerates electrochemical breakdown.
3. Thermal Cycling: Repeated heating and cooling in systems like shed 10 stainless steel pipe networks can cause thermal fatigue and micro-cracks.
4. Improper Welding: Unpassivated welds or excessive heat input during fabrication create vulnerable zones for intergranular corrosion.
5. Low Oxygen Environments: Crevices or stagnant water prevent the formation of the protective chromium oxide layer.

Identification & Marking

• Laser Etching: Permanent labels include grade (TP 904L/317L), OD, WT, heat number, and ASTM/ASME compliance.
• Color Coding: Green bands for TP 904L and red bands for TP 317L ensure quick visual identification.

Applications

• Chemical Processing: Sulfuric acid reactors, pipe stainless steel 316 replacement systems, and phosphoric acid transport lines.
• Marine Engineering: Seawater pipelines, offshore rigs, and desalination plants.
• Oil & Gas: High-pressure hydraulic lines, schedule 40s stainless steel pipe networks, and sour gas extraction systems.

Why Choose Our Stainless Steel Pipes?

1. Certified Quality: Compliant with ASTM, ASME, and EN standards. Full traceability with Mill Test Reports (MTRs).
2. Custom Sizes: Tailored shed 10 stainless steel pipe dimensions, bends, and welded joints for unique project requirements.
3. Global Logistics: Immediate availability of TP 904L/317L pipes in Sch10s–XXS schedules. Fast delivery worldwide.
4. Sustainability: 100% recyclable material with a 50+ year service life, reducing environmental impact.
5. Technical Expertise: 24/7 engineering support for corrosion management, welding protocols, and system optimization.