Stainless Steel 355 Alloy (UNS S35500)

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Other Designations
Fabrication and Heat Treatment
Machinability
Welding
Hot Working
Cold Working
Annealing
Aging
Tempering
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 355 stainless steel.

Chemical Composition

The following table shows the chemical composition of grade 355 stainless steel.

Element Content (%)
Iron, Fe
73.53 - 77.33
Chromium, Cr 15 - 16
Nickel, Ni 4 - 5
Molybdenum, Mo 2.5 – 3.5
Carbon, C 0.10-0.15
Manganese, Mn 0.5-1.25
Silicon, Si 0.5
Phosphorous, P 0.04
Sulfur, S 0.03

Physical Properties

The physical properties of grade 355 stainless steel are given in the following table.

Properties Metric Imperial
Density 7.7 – 8.03 g/cm3 0.278 – 0.290 lb/in³

Mechanical Properties

The mechanical properties of grade 355 stainless steel are displayed in the following table.

Properties Metric Imperial
Elastic Modulus 190 – 210 GPa 27557 – 30458 ksi
Poisson's Ratio 0.27 – 0.30 0.27 – 0.30

Other Designations

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Other designations that are equivalent to grade 355 stainless steel include the following:

  • AMS 5547
  • AMS 5549
  • AMS 5743
  • AMS 5744
  • AMS 5780
  • ASTM A564
  • ASTM A579
  • ASTM A693
  • ASTM A705
  • SAE J467 (AM-355)
  • MIL S-8840

Fabrication and Heat Treatment

Machinability

Adequate lubricant, positive feeds, slow speeds and sharp tooling are preferred for machining grade 355 stainless steel.

Welding

Grade 355 stainless steel can be welded using all common welding methods except oxyacetylene welding. The weld piece should be annealed after welding in order to attain maximum properties. A filler metal of similar composition can be used at high temperatures to obtain best results.

Hot Working

Hot working of grade 355 stainless steel can be performed after heating to 1177°C (2150°F) followed by slowly reducing the temperature to 982°C (1800°F).

Cold Working

Grade 355 stainless steel can be cold worked in the annealed condition. This alloy can tolerate only mild forming/deformation in the hardened condition.

Annealing

Grade 355 stainless steel can be annealed at 1010 to 1066°C (1850 to 1950°F) and then quenched rapidly.

Aging

Aging of grade 355 stainless steel can be performed at 732 to 760°C (1350 to 1400°F) followed by cooling to room temperature. The alloy is again aged at 440 to 468°C (825 to 875°F) for 3 hours and then air cooled.

Tempering

Grade 355 stainless steel can be tempered at 454°C (850°F) to attain maximum strength or 538°C (1000°F) to attain maximum corrosion resistance and toughness.

Hardening

Grade 355 stainless steel can be hardened by either sub zero or double aging methods. However, the alloy has to be rapidly cooled from 932°C (1710°F) before hardening.

Applications

The following are the major applications of grade 355 stainless steel.

  • Industrial cutters and knives
  • Valve and gas turbine components


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