Stainless Steel - Grade 329H (UNS S32900)

Sep 20 2012

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations

Introduction

Stainless steels are high-alloy steels which have high corrosion resistance than other steels owing to the presence of large amounts of chromium in the range of 4 to 30%.

Stainless steels are classified into martensitic, ferritic and austenitic based on their crystalline structure. In addititon, they form another group known as precipitation-hardened steels, which are a combination of martensitic and austenitic steels.

The following datasheet will provide more details about grade 329H stainless steel, which has slightly lower alloy content than grade 2205, and is inexpensive.

Chemical Composition

The following table shows the chemical composition of grade 329H stainless steel.

Element Content (%)
Iron, Fe 63
Chromium, Cr 28
Nickel, Ni 4.5
Manganese, Mn 2
Molybdenum, Mo 1.5
Silicon, Si 1
Carbon, C 0.10
Phosphorous, P 0.040
Sulfur, S 0.030

Physical Properties

The physical properties of grade 329H stainless steel are given in the following table.

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

Mechanical Properties

The mechanical properties of annealed grade 329H stainless steel are displayed in the following table.

Properties Metric Imperial
Tensile strength, ultimate 725 MPa 105000 psi
Tensile strength, yield (@0.2%) 550 MPa 79800 psi
Charpy impact 54 J 39.8 ft-lb
Elastic modulus 190 – 210 GPa 27557 – 30458 ksi
Poisson’s ratio 0.27 – 0.30 0.27 – 0.30
Elongation at break (in 50 mm) 25% 25%
Hardness, Brinell 230 230
Hardness, Knoop (converted from Brinell hardness) 253 253
Hardness, Rockwell B 96 96
Hardness, Rockwell C (converted from Brinell hardness) 20 20
Hardness, Vickers (converted from Brinell hardness) 242 242

Thermal Properties

The following table outlines the thermal properties of grade 329H stainless steel.

Properties Metric Imperial
Thermal expansion co-efficient (@20-815°C/68-1500°F) 14.4 µm/m°C 8 µin/in°F

Other Designations

Other designations that are equivalent to grade 329H stainless steel include the following:

  • ASTM A240
  • ASTM A268
  • ASTM A789
  • ASTM A790
  • ASTM A511
  • ASME SA268
  • ASME SA268
  • DIN 1.4460

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