Stainless steel Grade 439 (UNS S43035)

Topics Covered

Introduction
Chemical Composition
Mechanical Properties
Other Designations
Applications

Introduction

Stainless steel grade 439 is capable of being made into complex shapes such as tubular manifolds and exhaust system components, where temperatures tend to go beyond the oxidation limit of grade 409 steel. It is also preferred where wet corrosion resistance especially to chlorides is needed.

Stainless steel grade 439 has good weldability, brightness, and pitting corrosion resistance. It polishes well, and is good for deep drawing.

The following datasheet provides an overview of stainless steel grade 439.

Chemical Composition

The chemical composition of grade 439 stainless steel is outlined in the following table.

Element Content (%)
Iron, Fe 81.3535
Chromium, Cr 17.35
Silicon, Si 0.35
Titanium, Ti 0.335
Manganese, Mn 0.25
Nickel, Ni 0.200
Molybdenum, Mo 0.1
Niobium, Nb (columbium, Cb) 0.02
Phosphorous, P 0.02
Nitrogen, N 0.0100
Carbon, C 0.01
Sulfur, S 0.0015

Mechanical Properties

The mechanical properties of grade 439 stainless steel are displayed in the following table.

Properties Metric Imperial
Tensile strength (annealed) 438 MPa 63500 psi
Yield strength (annealed/ @strain 0.200 %) 263 MPa 38100 psi
Modulus of elasticity GPa ksi
Poisson’s ratio 0.270 - 0.290 0.270 - 0.290
Elongation at break (In 2", 50% cold worked) 2.80% 2.80%
Hardness, Rockwell B (annealed) 72.9 72.9

Other Designations

Equivalent material to grade 439 stainless steel is DIN 1.4510.

Applications

Stainless steel grade 439 is applied in areas that require oxidation and corrosion resistance. It is also widely used in catering equipment.

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