Stainless Steel – Grade 444 (UNS S44400)

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations

Introduction

Stainless steels are high-alloy steels that have excellent corrosion resistance in comparison with other steels as they contain more chromium.

Based on their crystalline structure, stainless steels are divided into three groups, namely, martensitic, austenitic and ferritic steels. A combination of martensitic and ferritic steels forms a fourth group known as precipitation-hardened steels.

The following datasheet provides an overview of grade 444 stainless steel.

Chemical Composition

The chemical composition of grade 444 stainless steel is outlined in the following table.

Element Content (%)
Iron, Fe 77.475
Chromium, Cr 18.5
Molybdenum, Mo 2
Nickel, Ni 1
Manganese, Mn 1
Silicon, Si 1
Carbon, C 0.025

Physical Properties

The following table shows the physical properties of grade 444 stainless steel.

Properties Metric Imperial
Density 7.80 g/cm3 0.282 lb/in³

Mechanical Properties

The mechanical properties of grade 444 stainless steel are displayed in the following table.

Properties Metric Imperial
Tensile strength 415 MPa 60200 psi
Yield strength (@strain 0.200%) 275 MPa 39900 psi
Elastic modulus 200 GPa 29000 ksi
Shear modulus 80-83 GPa 11600-12000 ksi
Poisson's ratio 0.27-0.30 0.27-0.30
Elongation at break 20% 20%
Hardness, Rockwell B 95 95

Thermal Properties

The thermal properties of grade 444 stainless steel are given in the following table.

Properties Metric Imperial
Thermal expansion co-efficient 10 µm/m°C 5.56 µin/in°F
Thermal conductivity 26.8 W/mK 186 BTU in/hr.ft².°F

Other Designations

Equivalent materials to grade 444 stainless steel are:

  • ASTM A176
  • SAE 51444


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