Stainless Steel – Grade 384 (UNS S38400)

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations

Introduction

Stainless steels are known as high-alloy steels. They are divided into four groups that include martensitic, austenitic, ferritic and precipitation-hardened steels.

Stainless steels contain good corrosion resistance in comparison with other steels because they contain larger amounts of chromium of about 10%.

The following datasheet provides an overview of grade 384 stainless steel.

Chemical Composition

The chemical composition of grade 384 stainless steel is outlined in the following table.

Element Content (%)
Iron, Fe 63
Nickel, Ni 18
Chromium, Cr 16
Manganese, Mn 2.0
Silicon, Si 1.0
Carbon, C 0.080
Phosphorous, P 0.045
Sulfur, S 0.030

Physical Properties

The following table shows the physical properties of grade 384 stainless steel.

Properties Metric Imperial
Density 8.00 g/cm3 0.289 lb/in³

Mechanical Properties

The mechanical properties of grade 384 annealed stainless steel are displayed in the following table.

Properties Metric Imperial
Tensile strength 515 MPa 74700 psi
Yield strength (@strain 0.200%) 240 MPa 34800 psi
Elastic modulus 193 GPa 28000 ks
Poisson's ratio 0.27-0.30 0.27-0.30
Elongation at break (in 50 mm) 55.00% 55.00%
Hardness, Brinell (converted from Rockwell B hardness) 123 123
Hardness, Knoop (converted from Rockwell B hardness) 138 138
Hardness, Rockwell B 70 70
Hardness, Vickers (converted from Rockwell B hardness) 129 129

Thermal Properties

The thermal properties of grade 384 stainless steel are given in the following table.

Properties Metric Imperial
Thermal expansion co-efficient (@0-100°C/32-212°F) 17.3 µm/m°C 9.61 µin/in°F
Thermal conductivity (@100°C/212°F) 16.3 W/mK 113 BTU in/hr.ft².°F

Other Designations

Equivalent materials to grade 384 stainless steel are:

  • ASTM A493
  • SAE 30384
  • SAE J405


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