Stainless Steel - Grade 330 (UNS N08330)

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Fabrication and Heat Treatment
Machinability
Welding
Hot Working
Cold Working
Annealing
Hardening
Applications

Introduction

Stainless steels are called as high-alloy steels. Due to the presence of large amounts of chromium in the range of 4 to 30%, they have high corrosion resistance than other steels. Stainless steels are classified into martensitic, ferritic and austenitic based on their crystalline structure. However, stainless steels present in the form of a combination of martensitic and austenitic steels are known as precipitation-hardened steels.

The following datasheet will provide more details about grade 330 stainless steel, which has high strength and resistance to carburization and oxidation at 1200°C (2200°F).

Chemical Composition

The following table shows the chemical composition of grade 330 stainless steel.

Element Content (%)
Iron, Fe 42
Nickel, Ni 36
Chromium, Cr 19
Manganese, Mn 2
Silicon, Si 1.13
Carbon, C 0.080
Phosphorous, P 0.040
Sulfur, S 0.030

Physical Properties

The physical properties of grade 330 stainless steel are given in the following table.

Properties Metric Imperial
Density 8 g/cm3 0.289 lb/in³

Mechanical Properties

The mechanical properties of annealed grade 330 stainless steel are displayed in the following table.

Properties Metric Imperial
Tensile strength, ultimate 550 MPa 79800 psi
Tensile strength, yield (@0.2%) 260 MPa 37700 psi
Modulus of elasticity 197 GPa 28600 ksi
Poisson’s ratio 0.27 – 0.30 0.27 – 0.30
Elongation at break (in 50 mm) 40% 40%

Thermal Properties

The following table outlines the thermal properties of grade 330 stainless steel.

Properties Metric Imperial
Thermal expansion co-efficient 14.4 µm/m°C 8 µin/in°F
Thermal conductivity 12.5 W/mK 86.8 BTU in/hr.ft².°F

Other Designations

Other designations that are equivalent to grade 330 stainless steel include the following.

  • AMS 5592
  • AMS 5716
  • ASTM B366
  • ASTM B511
  • ASTM B512
  • ASTM B535
  • ASTM B536
  • ASTM B546
  • ASTM B710
  • ASTM B739
  • DIN 1.4333
  • DIN 1.4864
  • SAE 30330
  • SAE J405 (30330)
  • SAE J412 (30330)

Fabrication and Heat Treatment

Machinability

Rigid mounts, sulfurized lubricants, positive feeds and slow speeds are recommended for machining grade 330 stainless steel.

Welding

Grade 330 stainless steel can be welded using GAW techniques.

Hot Working

Hot working of grade 330 stainless steel can be performed at 1149 to 1177°C (2100 to 2150°F).

Cold Working

It is difficult to perform cold working in grade 330 stainless steel as the steel has high strength and work hardening rate. However, this steel can be cold worked using strong forces.

Annealing

Grade 330 stainless steel can be annealed at 1121 to 1204°C (2050 to 2200°F).

Hardening

Grade 330 stainless steel is unresponsive to heat treatment. It can be hardened only through cold reduction.

Applications

The following are the major applications of grade 330 stainless steel:

  • Gas turbines
  • Heat exchangers
  • General heat treating equipment
  • Neutral and cyanide salt pots

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