Main characteristics and uses of austenitic-ferritic (duplex) stainless steel S21860 1Cr18Ni11Si4AlTi

1Cr18Ni11Si4AlTi Martensitic-Ferritic Stainless Steel S21860

Introduction

1Cr18Ni11Si4AlTi (S21860) is a martensitic-ferritic type of stainless steel developed by Chinese specialty metal producer Sanhe Special Metal Co., Ltd. It has properties found in both martensitic and ferritic stainless steel grades. It is a dual-phase stainless steel that contains both martensitic and ferritic microstructures. Due to the combination of these two microstructures, the steel has good strength, toughness, and corrosion resistance, making it suitable for a wide range of applications.

Chemical Composition

The chemical composition of 1Cr18Ni11Si4AlTi varies according to its grade and finish. The following table displays the typical chemical composition of the S21860 steel grade.

Carbon: 0.08–0.12

Manganese: 1.25–1.80

Silicon: 0.90–1.35

Phosphorus: 0.035 max

Sulfur: 0.030 max

Chromium: 18.00–20.00

Nickel: 8.00–10.00

Molybdenum: 0.60–0.90

Titanium: 0.05–0.20

Aluminum: 0.10–0.20

Physical and Mechanical Properties

The physical and mechanical properties of 1Cr18Ni11Si4AlTi depend on its heat treatment condition and its grade. The general physical properties of the S21860 stainless steel at room temperature are as follows:

Density: 7.8 g/cm3

Complex Modulus (29°C): 200 GPa

Compressive Strength: 280 MPa

The general mechanical properties of the S21860 stainless steel at room temperature are as follows:

Tensile Strength: 580–850 MPa

Yield Strength: 275–475 MPa

Elongation: 35–60%

Hardness: 33 HRC

Thermal Properties

The thermal properties of 1Cr18Ni11Si4AlTi depend on the grade and its heat treatment condition. The general thermal properties at room temperature are as follows:

Thermal Conductivity (20°C): 14.50 W/m·K

Thermal Expansion (25–500°C): 11.2 µm/m·K

Specific Heat Capacity (25°C): 500 J/kg·K

Applications

1Cr18Ni11Si4AlTi (S21860) is suitable for a wide variety of applications due to its unique combination of properties. It is often used in oil and gas exploration and production, offshore platforms, and aerospace and defense applications. Additionally, it is commonly used in high-temperature applications such as turbines and boilers, as well as in automotive and general engineering applications.

Conclusion

1Cr18Ni11Si4AlTi (S21860) is a dual-phase stainless steel that contains both martensitic and ferritic microstructures. It has excellent strength, toughness, and corrosion resistance. Additionally, it has good thermal properties and is suitable for a wide variety of applications.

S21860 is a kind of iron-based duplex stainless steel developed by Aoste Ferrite Co., Ltd. It has excellent comprehensive physical and chemical properties, high strength and corrosion resistance, as well as excellent weldability, suitable for use in various corrosive environments such as sea water.

S21860 is a type of duplex stainless steel. It is composed of austenite and ferrite in different proportions. It contains chromium, nickel, molybdenum, titanium, aluminum and other alloy elements. The combination of these elements gives it excellent comprehensive performance and corrosion resistance. For example, it is better than 304 stainless steel in terms of pitting corrosion resistance (PREN) and stress corrosion resistance.

S21860 has a higher yield strength and impact toughness than ordinary austenitic stainless steel, and better weldability than ordinary ferritic stainless steel, which is convenient for fabrication. It is generally used in petrochemical, pharmaceutical, seawater engineering, and food processing industries.

S21860 is a kind of stainless steel with excellent performance and superior surface stability, making it suitable for construction and home improvement projects. This kind of stainless steel has excellent structural performance, reliable crystallization and corrosion resistance. It is especially suitable for corrosion resistance in coastal and offshore engineering, and other corrosion-related applications.