317L Stainless Steel (1.4449)

Engineered to deliver both corrosion resistance and structural performance, 317L maintains its mechanical reliability under pressure, heat, and fabrication stress.

Tensile Strength: 515–760 MPa - Suitable for structural assemblies and pressurised piping.

Yield Strength (0.2%): ≥ 205 MPa - Handles sustained loads in fabricated tank and vessel walls.

Elongation at Break: ≥ 40% - Supports formability and cold working for process-specific parts.

Hardness: Rockwell B95 max - Allows machining and shaping without sacrificing wear tolerance.

Modulus of Elasticity: 193 GPa - Provides stability for load-bearing frameworks and bracketed fixtures.

This mechanical balance makes 317L stainless steel a trusted material for pressure vessels, offshore assemblies, and corrosive production infrastructure.

317L delivers stable physical performance across a wide range of thermal and operational conditions, making it suitable for both structural and fluid-contact components.

Density: 8.0 g/cm³ - Supports strength and durability in compact system designs.

Melting Point: 1370–1398 °C - Withstands sustained heat in industrial evaporators and condensers.

Thermal Conductivity: 13.0 W/m·K - Allows for moderate heat transfer in heat exchangers and process lines.

Thermal Expansion: 15.9 × 10⁻⁶/K - Maintains dimensional stability in variable temperature applications.

Modulus of Elasticity: 193 GPa - Ensures stiffness for bracketed pipework and structural fixings.

These properties make 317L reliable for use in systems subject to thermal cycling, high-pressure flow, and elevated process temperatures.

Variants of 317 stainless steel have been developed to improve performance in highly specific environments. Each offers a tailored combination of strength, corrosion resistance, or fabrication flexibility:

317: Standard carbon grade, used where welding and sensitisation are not concerns.

317LMN: Enhanced with molybdenum and nitrogen for increased pitting resistance and mechanical strength, ideal for highly chlorinated or acidic environments.

317L remains the most widely used version for fabricated systems, welded assemblies, and chemical-handling infrastructure, particularly when long-term exposure to corrosive environments is expected.