1.8519 Steel | AISI 4320 | 20NiCrMo2-2 Supplier in UAE – A Guide to Properties, Applications, and Supply 

1.8519 steel, also known by its EN designation 20NiCrMo2-2 and AISI equivalent 4320, is a high-performance case-hardening alloy steel. Renowned for its exceptional combination of high strength, core toughness, and hardenability, it is a critical material for manufacturing components subjected to intense stress and wear. Its unique properties make it a preferred choice in demanding engineering, automotive, and industrial applications. 

As a leading stockist and supplier of specialized engineering materials, Nifty Alloys LLC provides a reliable supply of premium 1.8519 steel to clients across the UAE, the Middle East, and globally. We ensure that all materials meet stringent international standards, are sourced from approved mills, and are delivered with complete documentation to support your project's quality and compliance requirements. 

What is 1.8519 Steel? 

1.8519 steel is a low-carbon, nickel-chromium-molybdenum alloy steel specifically designed for case hardening. This heat treatment process creates a hard, wear-resistant surface layer (case) while maintaining a softer, tougher core. This dual-property structure is essential for components that must withstand both surface wear and significant shock loads without fracturing. 

Its standard designations include 20NiCrMo2-2 under the EN standard and AISI 4320 in the American system. The presence of nickel enhances its toughness and impact strength, while chromium and molybdenum contribute to its hardenability, strength, and resistance to tempering. This balanced composition allows for uniform hardening, even in larger cross-sections, making it a reliable material for heavy-duty applications. 

The steel's primary characteristics include: 

• Excellent Case Hardening Properties: Achieves a very high surface hardness after carburizing, quenching, and tempering. 
• High Core Toughness: The low-carbon core remains ductile and resistant to shock, preventing catastrophic failure under load. 
• Superior Wear Resistance: The hardened case provides exceptional resistance to abrasion and surface fatigue. 
• Good Machinability: In its annealed or normalized state, 1.8519 steel offers good machinability, allowing for complex parts to be manufactured before the final hardening treatment. 

These attributes make 1.8519 alloy steel indispensable for high-stress engineering components where reliability and longevity are paramount. 

Features and Benefits of 1.8519 Steel 

The specific alloy formulation of 1.8519 steel delivers a host of features that translate into tangible benefits for high-stress applications. 

• Excellent Toughness and Fatigue Strength: The high nickel content ensures superior core toughness and resistance to fatigue failure from cyclical loading, which is critical for components like gears and crankshafts. 
• High Hardenability: The combination of chromium, molybdenum, and nickel allows for deep and uniform hardening, making it suitable for parts with larger cross-sections that require consistent properties throughout. 
• Exceptional Wear Resistance: Once case-hardened, the surface achieves a high hardness level, providing outstanding resistance to abrasion, friction, and surface fatigue. 
• Good Dimensional Stability: The material exhibits good stability during and after heat treatment, minimizing distortion and ensuring that finished components meet tight dimensional tolerances. 
• Reliable Core Ductility: Even after achieving high surface hardness, the core remains ductile and capable of absorbing shock loads, preventing brittle fractures that can lead to catastrophic equipment failure. 
• Good Machinability in the Annealed Condition: Before hardening, the steel can be easily machined, drilled, and formed, reducing manufacturing costs and complexity.