Stainless Steel Pipes | Thick-Wall 317L/904L for Harsh Conditions

Stainless Steel Pipes | Thick-Wall 317L/904L for Harsh Conditions

Product Overview

Our ASME-certified 317L/904L stainless steel pipes are engineered to withstand extreme environments, including high chloride exposure, acidic media, and elevated temperatures. Designed for industries such as chemical processing, marine engineering, and oil & gas, these pipes combine superior corrosion resistance, high-temperature stability, and exceptional mechanical strength to ensure reliability in the most demanding applications.

Technical Specifications

Key Mechanical Properties

Tensile Strength

• 317L: ≥480 MPa | 904L: ≥520 MPa
  The high tensile strength of 317L and 904L ensures structural integrity under extreme pressure, making them ideal for pipelines in chemical reactors, offshore platforms, and high-pressure hydraulic systems.

Bending Strength

• 317L/904L: Both grades exhibit excellent ductility, allowing cold bending up to 180° without cracking. Compatible with stainless steel pipe bender tools for precision shaping in confined spaces, such as shipbuilding and HVAC installations.

Material Properties & Advantages

1. Corrosion Resistance

   • 317L: Enhanced with 3–4% molybdenum, it resists pitting and crevice corrosion in chloride-rich environments (e.g., seawater, chemical plants).
   • 904L: Contains 4–5% molybdenum and 1–2% copper, offering superior resistance to sulfuric acid, phosphoric acid, and chloride-induced stress corrosion cracking (SCC).

2. High-Temperature Performance

   • 317L: Stable up to 870°C, ideal for boilers and heat exchangers.
   • 904L: Maintains integrity at 800°C, suitable for flue gas desulfurization (FGD) systems.

3. Hygienic & Low Maintenance

   • Smooth surfaces inhibit bacterial growth, compliant with FDA and EHEDG standards for food, pharmaceutical, and sanitary applications.

Weight Calculation Formula

Weight (kg/m) = (OD – WT) × WT × 0.02491
Example: For a stainless steel pipe hangers system (OD: 219.1 mm, WT: 12.7 mm):
(219.1 – 12.7) × 12.7 × 0.02491 = 63.2 kg/m

Why Stainless Steel Pipes Corrode?

Despite their corrosion-resistant reputation, stainless steel can rust under specific conditions:

• Chloride Exposure: Prolonged contact with seawater or de-icing salts causes localized pitting, especially in low-pH environments where the passive chromium oxide layer degrades.
• Galvanic Corrosion: Contact with dissimilar metals (e.g., carbon steel) in conductive fluids accelerates electrochemical degradation.
• Improper Welding: Unpassivated welds or heat-affected zones (HAZ) become vulnerable to intergranular corrosion.

Identification & Marking

• Laser Etching: Permanent labels include grade (317L/904L), OD, WT, and heat number per ASTM A480.
• Color Coding: Red bands for 317L and blue bands for 904L ensure quick visual identification in storage and installation.

Applications

• Chemical Processing: Reactors, heat exchangers, and stainless steel pipe supports for acid transport.
• Marine Engineering: Seawater pipelines, offshore rigs, and stainless steel pipe straps for corrosion-resistant fastening.
• Power Plants: FGD systems, boiler tubes, and high-temperature steam lines.

Why Choose Our Stainless Steel Pipes?

1. Certified Quality: Compliant with ASME, ASTM, and EN standards. Full traceability with Mill Test Reports (MTRs) and 3.1 certification.
2. Custom Solutions: Tailored dimensions, bends, and stainless steel pipe hangers for complex installations.
3. Global Logistics: Large inventory of 317L/904L pipes in Sch10s–XXS schedules. Fast delivery to Europe, North America, and Asia.
4. Technical Expertise: 24/7 engineering support for material selection, corrosion prevention, and system design.