Chromium-Nickel Austenitic Stainless Steel 1Cr17Ni7 (AISI301) Physical Properties

Introduction

1Cr17Ni7 (AISI 301) stainless steel is a commonly used austenitic stainless steel. It has good corrosion resistance, weldability and formability. 1Cr17Ni7 (AISI 301) stainless steel can be used for many applications including: chemical and food processing, medical equipment, and heat exchangers.

Chemical composition

As an austenitic stainless steel, 1Cr17Ni7 (AISI 301) contains an austenitic crystal structure as its major base element, which provides corrosion resistance and excellent mechanical properties. The chemical composition of 1Cr17Ni7 (AISI 301) stainless steel is as follows:[1]

• Chromium (Cr): 16.00-18.00%

• Nickel (Ni): 6.00-8.00%

• Manganese (Mn): 2.00% max

• Silicon (Si): 0.75% max

• Phosphorus (P): 0.045% max

• Sulfur (S): 0.030% max

• Carbon (C): 0.080% max

• Copper (Cu): 0.75% max

• Titanium (Ti): 0.20-0.60%

The addition of chromium and nickel gives 1Cr17Ni7 (AISI 301) its corrosion resistance and ductility, while the other elements such as manganese, silicon, phosphorus, sulfur and carbon are used to balance the properties of the material.

Mechanical properties

1Cr17Ni7 (AISI 301) stainless steel exhibits excellent mechanical properties, especially at higher temperatures due to its austenitic microstructure. The yield strength of 1Cr17Ni7 (AISI 301) stainless steel is 173MPa, while its tensile strength is 517MPa, with an elongation of 45%。

1Cr17Ni7 (AISI 301) stainless steel also has excellent heat resistance, with an operating temperature of 0-800°C (843°F). This makes it an ideal material for applications that are exposed to high temperatures, such as heat exchangers and boilers.[2]

Corrosion resistance

1Cr17Ni7 (AISI 301) stainless steel exhibits good corrosion resistance due to the presence of chromium, nickel and molybdenum in its composition. This alloy is highly resistant to atmospheric elements, as well as to a wide range of corrosive environments such as fresh water, steam, salt water and organic acids. 1Cr17Ni7 (AISI 301) stainless steel’s use in medical implant research has been increasing in recent years due to its high resistance to biogenic corrosion.

Weldability

1Cr17Ni7 (AISI 301) stainless steel is highly weldable due to its austenitic microstructure. This allows the material to be welded using conventional fusion processes such as shielded metal arc welding (SMAW), gas tungsten arc welding (GTAW), gas metal arc welding (GMAW) and plasma arc welding (PAW).[3]

Conclusion

1Cr17Ni7 (AISI 301) stainless steel is an austenitic stainless steel that has good mechanical properties and excellent corrosion resistance due to its chemical composition. The material also demonstrates excellent weldability and heat resistance, making it ideal for use in applications such as heat exchangers, boilers and medical implants.

AISI 301(1Cr17Ni7) stainless steel is a low carbon steel containing 17% chromium and 7% nickel. It has good increased strength and is resistant to corrosion and abrasion. This steel is particularly well suited for applications requiring cold working properties, such as high strength and fatigue resistance.

Physical properties of AISI 301 stainless steel include:

Density: 7.8 g/cm3

Tensile strength: 500-1000 MPa

Yield strength: 200-500 MPa

Elongation at break: 35-50%,

Hardness: Rb80-Rb90

Impact toughness: > 10J

Volume resistance: 200-400 mV

Specific Heat Capacity: 450 - 500 J/kg-K

Coefficient of thermal Conductivity: 18- 21 W/mK

Thermal expansion coefficient: 16-20 μm/m.K

AISI 301 stainless steel also has good electrical conductivity and is magnetic.

Applications of AISI 301 stainless steel include food industry, pulp and paper industry, automotive components, medical equipment and industrial fasteners. In addition to its strength and resistance to corrosion and abrasion, it is also non-magnetic which makes it a great choice for specialised applications.