Gallianz's Controlled Rolling for High-Performance 2205 Duplex Stainless Steel

Core Mechanism of Controlled Rolling's Impact on Properties

The root cause of controlled rolling's significant influence on material properties is that it alters the material's "gene"—its microstructure:

Phase Proportion & Morphology Regulation

2205 duplex stainless steel consists of austenite (γ) and ferrite (α) phases. Controlled rolling precisely adjusts the proportion and morphology of these two phases. For example, higher rolling temperature or larger deformation usually increases ferrite content. Meanwhile, high-temperature deformation elongates grains along the rolling direction, while low-temperature rolling refines grains more effectively (even forming microcrystal-nanocrystal composite structures)—the key to achieving high strength and plasticity.

Defect & Texture Introduction

Rolling deformation generates high-density dislocations inside the material. These entangled dislocations hinder subsequent deformation, thus enhancing strength and hardness (work hardening effect). In addition, different rolling methods (e.g., symmetric/asymmetric rolling) affect grain orientation (texture), which in turn changes the material's anisotropy and formability.

How to Select Controlled Rolling Parameters Based on Objectives

Weigh process parameters according to your primary goal:

• Pursuing high strength: Use lower rolling temperature (e.g., 600-800℃) with larger deformation (e.g., 50%-70%)—this maximizes grain refinement strengthening and dislocation strengthening.

• Pursuing high plasticity/formability: Adopt higher rolling temperature (e.g., ~1000℃) with moderate deformation to get better phase balance and grain morphology; or use advanced processes like asymmetric rolling to improve formability.

• For composite plate preparation: Lower finish rolling temperature (e.g., 850℃) boosts interface shear strength; rapid cooling (>10℃/s) after rolling is critical for excellent microstructural properties.

• Controlling production cost & quality: To balance cost-efficiency with product quality, Gallianz employs innovative processes such as variable-thickness cross rolling. This technique minimizes edge cracking in strips, thereby improving material yield and ensuring consistent product quality—key advantages that distinguish Gallianz from conventional plate suppliers.