Duplex Steel Bar

Product Description

Duplex stainless steel bars are engineered with a balanced, two-phase microstructure consisting of approximately 50% austenite and 50% ferrite. This combination provides the best of both worlds: the ferritic phase delivers extremely high mechanical strength (roughly double that of standard 304 or 316 austenitic stainless steel), while the austenitic phase ensures excellent ductility and toughness.

They are highly sought after for demanding industrial hardware, fasteners, and structural applications due to their exceptional resistance to stress corrosion cracking (SCC), pitting, and crevice corrosion in high-chloride or marine environments.

Key Industrial Grades

Depending on your structural or environmental requirements, duplex bars are classified into different categories based on their alloying elements (like chromium, molybdenum, and nitrogen):

• Standard Duplex (Grade 2205 / UNS S32205 / S31803): The most widely specified grade. It features 22% chromium and 3% molybdenum, offering an optimal balance of high yield strength (typically 450 MPa min) and superior general corrosion resistance. It is standard for critical industrial equipment, chemical storage, and high-purity rods.

• Super Duplex (Grades 2507, F55, F61 / UNS S32750, S32760): Highly alloyed with 25% chromium and up to 4% molybdenum. These grades reach a Pitting Resistance Equivalent Number (PREN) above 40, delivering exceptional tensile strengths (up to 770 MPa min) and advanced protection in aggressive fluids, hot chlorides, and subsea environments.

Available Product Options

Industrial suppliers offer these bars across multiple finishes (bright, smooth-turned, or peeled) and certified specifications to suit heavy-duty engineering projects:

Standard 2205 Grade Bars

Duplex Steel 2205 Round Bar is an elite choice for general industrial processing, marine engineering, and chemical handling. It delivers a reliable 620 MPa tensile strength and 450 MPa yield strength alongside strong resistance to localized crevice corrosion.

If your system operates under standard marine or chemical processing environments where high stress and chloride presence are concerns, the Duplex 2205 profile offers an incredibly cost-effective, high-strength solution. For heavy-duty subsea structural elements or high-temperature acidic exposure, stepping up to Super Duplex F55 provides the necessary mechanical safety margins.