GB/T 20878 S31793 Introduce

The superior mechanical strength of GB/T 20878 S31793 stainless steel makes it suitable for various industrial, mechanical and structural applications. Its excellent thermo-mechanical properties, combined with its good creep strength and resistance to aggressive acids, make this alloy ideal for producing parts for high temperature applications, energy and power systems, medical equipment, and automotive components. Additionally, its low coefficient of thermal expansion gives it superior formability and lets it be welded easily and with minimal distortion.

Smelting temperature:1711°C - 1992°C

Application:Stainless steel and heat resistant steel grades and chemical composition

GB/T 20878 S31793 Material Chemical Composition

The chemical composition of the GB/T 20878 S31793 steel are as follows:

ElementMinMax
Silicon (Si)-1.0000
Sulfur (S)-0.0100
PhOsphorus (P)-0.0250
Nickel (Ni)13.000015.0000
Nitrogen (N)-0.1000
Molybdenum (Mo)2.25003.5000
Manganese (Mn)-2.0000
Copper (Cu)-0.5000
Chromium (Cr)17.000019.0000
Carbon (C)-0.0300

GB/T 20878 S31793 Material Mechanical Properties

The strength of GB/T 20878 S31793 steel depends on the specific grade and can range from 335MPa to 835MPa. Its tensile strength, or the amount of force it can resist, can range from 435MPa to 1035MPa. The yield strength, which is the amount of force it takes to cause permanent deformation, can range from 355MPa to 785MPa.

The mechanical properties of the GB/T 20878 S31793 steel are as follows:

YieldRp0.2 ≤ 763 (MPa)
TeileRm≤ 686 (MPa)
ImpactKV/Ku42(J)
ElongationA44%
Reduction in cross section on fractureZ12%
As-Heat-Treated ConditionSolution and Aging, Annealing, Ausaging, Q+T,etc
Brinell hardness (HBW)243

GB/T 20878 S31793 Material Thermal Properties

The thermal performance parameters of the GB/T 20878 S31793 steel are as follows:

Temperature (°C)23554398
Modulus of elasticity (GPa)-499-
Mean coefficient of thermal expaion ×10-6/(°C)--41
Thermal conductivity (W/m·°C)-31.341.2
Specific thermal capacity (J/kg·°C)-341-
Specific electrical resistivity (Ω mm²/m)0.13--
Deity (kg/dm³)--342
Poisson’s coefficient, ν--121

GB/T 20878 S31793 Material Machining Technology

The type of cutting tool chosen depends on the end-use application and the desired cutting performance. In general, high-speed steel (HSS) or high-speed cobalt (HSC) tools are best for machining GB/T 20878 S31793 steel as they have excellent cutting properties and can cope with high cutting speeds and feeds. Carbide grade tools may be used for high-shear or high-feed applications.