LDX 2101

What is Lean Duplex 2101?

Lean Duplex 2101 (LDX 2101) is a type of stainless steel that combines good strength with corrosion resistance, making it suitable for general-purpose use. It has high mechanical strength, much like other duplex steels, and performs better than 300 series stainless steels when resisting cracking caused by exposure to chlorides. LDX 2101 uses manganese to maintain the right balance between its ferrite and austenite structure, which also helps reduce the amount of nickel needed, making it more affordable than 304L and 316L grades. Its lower alloy content also means it's less likely to develop unwanted intermetallic phases over time, giving it an edge in durability.

Chemical Compositions of Lean Duplex 2101

Cr	Ni	Mo	C	N	Mn	Si	P	S	Cu	Fe
21.0–22.0	1.35–1.70	0.10–0.80	0.040 Max	0.20–0.25	4.00–6.00	1.00 Max	0.040 Max	0.030 Max	0.10–0.80	Balance

Chromium (21.0–22.0%): Provides excellent corrosion resistance and enhances durability in harsh environments.

Nickel (1.35–1.70%): Contributes to the steel's toughness and helps maintain the duplex structure.

Molybdenum (0.10–0.80%): Adds extra corrosion resistance, especially in chloride-rich settings.

Carbon (Max 0.040%): Kept low to ensure good weldability and prevent carbide precipitation.

Nitrogen (0.20–0.25%): Increases strength and improves pitting resistance, essential for duplex steel properties.

Manganese (4.00–6.00%): Supports austenite formation and allows reduced nickel content, making the alloy cost-effective.

Silicon (Max 1.00%): Enhances oxidation resistance and aids in the steel’s manufacturing process.

Phosphorus (Max 0.040%) & Sulfur (Max 0.030%): Controlled at low levels to maintain toughness and prevent brittleness.

Copper (0.10–0.80%): Improves resistance to certain acids and contributes to corrosion resistance.

Iron (Balance): Forms the base metal, providing structure and strength to the alloy.

Mechanical Properties of 2101 Duplex Stainless Steel

Alloy	Ultimate Tensile Strength, ksi Minimum	0.2% Yield Strength, ksi Minimum	Elongation % Minimum	Hardness Brinell Maximum
LDX 2101	94	65	30	290

Ultimate Tensile Strength (94 ksi minimum):

Indicates the maximum stress the material can withstand while being stretched before breaking, showing its strong load-bearing capacity.

0.2% Yield Strength (65 ksi minimum):

The stress level at which the material begins to deform permanently, reflecting its excellent strength under pressure.

Elongation (30% minimum):

Measures ductility, showing the material can stretch up to 30% before breaking, which makes it more flexible and less prone to cracking.

Hardness (Brinell 290 maximum):

Suggests the material’s resistance to indentation and wear, with a balance between hardness and workability.

Types of Corrosion Properties

The 300 series stainless steels are used extensively in numerous process industries due to their overall general corrosion resistance. The corrosion resistance of LDX 2101 is generally better than other grades comparatively making it suitable for use in a wide variety of industries and applications.

What are the characteristics of LDX 2101?

Applications of Lean Duplex 2101

Storage Tanks:

LDX 2101 stainless steel is used in storage tanks due to its high strength and good corrosion resistance, which helps store liquids safely, even in harsh or corrosive environments.

Household Heaters:

The alloy is ideal for household water heaters because it resists rust and scaling, ensuring long-lasting performance and a clean water supply.

Structural Components:

Its high mechanical strength and durability make it perfect for structural parts like floodgates, bridge components, and reinforcement bars in concrete. It can withstand stress, moisture, and outdoor conditions without failing.

Pulp and Paper Industry Applications:

In the pulp and paper industry, ldx 2101 material is used in machinery and components that handle chemicals and moisture. Its corrosion resistance helps extend equipment life and reduce maintenance.

Flanges and Valves:

LDX 2101 duplex is suitable for making flanges and valves that are exposed to pressure, water, or chemicals. It ensures leak-proof performance and durability in both industrial and plumbing systems.

Heat Treatment

The high chromium content in duplex stainless steels helps protect against corrosion but can lead to brittleness at temperatures above 300°C. At low temperatures, duplex stainless steels remain more ductile than ferritic and martensitic types and can be safely used at temperatures as low as -50°C.

Fabrication

To prevent contamination during the fabrication of 2101 duplex stainless steel, it's essential to use tools and work surfaces exclusively dedicated to stainless steel materials. Before starting any fabrication process, ensure that all equipment and surfaces are thoroughly cleaned.

Machinability

Lean Duplex 2101 is machinable, but like other duplex stainless steels, its high strength can make machining more difficult than standard austenitic grades. Machining speeds are generally slower and in order to achieve good results, it's critical to utilize sharp tools, follow the right cutting processes and make sure you're using enough coolants to control heat buildup.

Weldability

All common welding techniques work with duplex stainless steels, which have good weldability. Although they could be more difficult to weld than austenitic grades, their limited thermal expansion makes welds cleaner, and more stable by minimizing distortion and leftover stress.

Lean Duplex 2101 Products