Stainless Steel - Grade 153 MA (UNS S30415)

Topics Covered

Introduction
Chemical Composition
Mechanical properties
Manufacturing Process
Applications

Introduction

Stainless steel 153 MA has excellent mechanical properties at both elevated and very low temperatures. The presence of cerium, nitrogen and silicon contents in its composition provides the alloy good oxide stability, resistance to sigma phase precipitation and strength at high temperature. The austenitic structure offers excellent toughness even at cryogenic temperatures as well. The optimal performance of stainless steel 153 MA can be achieved at 600 to 950°C (1112 to 1742°F).

Chemical Composition

The chemical composition of Grade 153 MA stainless steel is outlined in the following table.

Element Content (%)
Iron, Fe ~ 69
Chromium, Cr 18-19
Nickel, Ni 9-10
Silicon, Si 1-2
Nitrogen, N 0.12-0.18
Carbon, C 0.04-0.06
Cerium, Ce 0.03-0.08

Mechanical properties

The mechanical properties of Grade 153 MA stainless steel are displayed in the following table.

Properties Metric Imperial
Hardness, Brinell 210 210
Ultimate Tensile Strength 500 - 720 MPa 72518 - 104427 psi
Elongation at Break 40% 40%
Modulus of Elasticity 200 GPa 29000 ksi

Manufacturing Process

Stainless steel 153 MA can be welded using techniques like submerged arc welding, plasma arc welding, flux-cored arc welding and shielded metal arc welding. It is essential to have pure Ar with 2-3 % hydrogen additions as the base of the shielding and welding gases to obtain optimal penetration and corrosion resistance. The alloy is then hot formed at temperatures ranging from 900 to 1150°C (1652 to 2102°F) followed by rapid cooling. The alloy also has excellent cold forming properties. Finally, the alloy is heat treated at 1020 to 1100°C (1868 to 2012°F).

Applications

The following are some of the major applications of Grade 153 MA stainless steel:

  • Cement industry
  • Hot air dryer
  • Recuperators
  • Hydrocarbon gases, painting
  • Super heater tubes, fluidised bed
  • Waste combustion
  • Preheating of exhaust gas

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