Introduction to 00Cr18Ni15Si4(Nb) steel grade

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1. Introduction to Steel Grade 0Cr18Ni15Si4(Nb)

Steel grade 0Cr18Ni15Si4(Nb) is a type of austenitic stainless steel. It has very good mechanical properties, mainly in terms of strength, toughness and corrosion resistance. This steel grade is widely used in the nuclear and energy industries, and also in various other industries where superior material properties are required.

2. Chemical Composition

The chemical composition of Steel Grade 0Cr18Ni15Si4(Nb) is provided in Table 1.

Table 1. Chemical Composition of 0Cr18Ni15Si4(Nb).

Component Percentage (%)

Carbon (C) 0.03

Chromium (Cr) 17-19

Nickel (Ni) 14-16

Silicon (Si) 4.0-4.5

Manganese (Mn) ≤2.00

Titanium (Ti) ≤0.75

Nitrogen (N) ≤0.20

Niobium (Nb) ≤1.00

Iron (Fe) Balance

3. Physical and Mechanical Properties

Table 2 shows the physical and mechanical properties of Steel Grade 0Cr18Ni15Si4(Nb).

Table 2. Physical and Mechanical Properties of 0Cr18Ni15Si4(Nb).

Properties Description

Density 7.75 g/cm³

Tensile Strength 550 - 900 MPa

Yield Strength 205 MPa

Elongation at Break ≈ 45%

Hardness ≈200 HB

4. Heat Treatment

Generally speaking, heat treatment of Steel Grade 0Cr18Ni15Si4(Nb) is not necessary. If annealing is required, it can be done at temperatures between 1050°C and 1150°C for about 20 minutes thanks to its austenitic structure.

5. Applications

Steel Grade 0Cr18Ni15Si4(Nb) is popularly used in industries such as nuclear and energy, automobile, petrochemical, mechanical engineering and food processing. Furthermore, it is also used in heat exchangers, evaporators, pumps, valves and pressure vessel components thanks to its excellent corrosion resistance, strength and toughness.

6. Conclusion

Steel grade 0Cr18Ni15Si4(Nb) is an austenitic stainless steel that provides excellent strength, toughness and corrosion resistance. Therefore, it is used in applications where superior material properties are required such as in the nuclear and energy industries. Furthermore, this steel grade has good resistance to heat treatment and can be annealed at temperatures between 1050°C and 1150°C for about 20 minutes.

SUS310S is a steel of cold rolled low carbon austenitic stainless steel, also known as 0Cr18Ni15Si4(Nb) steel.

It consists of (in weight percentage) 0.08% Carbon (C), 2.00-2.50% Manganese (Mn), 1.50-3.00% Silicon (Si), 17.50-19.50% Chromium (Cr), 15.00-17.00% Nickel (Ni), 0.50-1.50% Niobium (Nb) and about 0.10-0.30% Nitrogen (N). As a result of its chemical composition, this steel has a good strength and corrosion resistance.

The mechanical properties of SUS310S steel could be calculated by extracting the composition values from its chemical composition. The physical properties are calculated by multiplying the chemical composition values by the appropriate physical factors and the mechanical properties are calculated by multiplying the material constants with the physical data by the appropriate constants.

The yield strength β of SUS310S steel is 289.95 Mpa, tensile strength δ of is 512.60 Mpa, and the total elongation τ is 40-41%. The other mechanical properties include impact strength and the Brinell hardness (HB).

SUS310S steel could be used for higher temperature application, such as for hot water tanks and heat exchangers. Moreover, it is usded for chemical process vessels and power plants.

This type of steel has great anti-high temperature creep strength, which makes it suitable for producing such parts like boiler tubes and turbo super-heater tubes for fossil fuel power plant. Also, SUS310S steel has good performance in hydrated medium, so it may be used as valves and pumps. It is also used to make heat exchanger tubes, chemical reactors and containers.

In summary, SUS310S is a kind of low carbon austenitic stainless steel, providing good corrosion and heat resistance, and its mechanical properties could stand up to the higher temperature. Therefore, SUS310S steel can be used widely in various industries.