Duplex Steel UNS s31803 Pipes31
Duplex Steel UNS s31803 Pipes
Precipitation Hardening Stainless Steel 15-5PH Pipes21
Precipitation Hardening Stainless Steel 15-5PH Pipes

Instruction of Alloy 20 Pipes

Alloy 20 pipes(UNS N08020) is an austenitic, nickel-iron-chromium based super alloy with additions of Copper and Molybdenum which provide resistance to hostile environments, pitting, and crevice corrosion. It is also stabilized with Columbium to minimize carbide precipitation during welding. Alloy 20 appears to fall between both the stainless and nickel categories as it contains characteristics of both. It was designed for maximum resistance to acid attack and demonstrates superior resistance to stress-corrosion cracking in boiling 20% to 40% sulfuric acid, and also has excellent general corrosion resistance to sulfuric acid and to chloride stress corrosion cracking. Alloy 20 has good mechanical properties at both ambient and elevated temperatures, up to approximately 930°F (500°C) and is readily fabricated by usual industrial processes.

Alloy 20 Pipes27
Alloy 20 Pipes
Alloy 20 Pipes28
Alloy 20 Pipes
Alloy 20 Pipes29
Alloy 20 Pipes
Alloy 20 Pipes30
Alloy 20 Pipes

Features of Alloy 20 Pipes

1. Alloy 20 Pipe Corrosion Resistance:

  • xcellent resistance to general corrosion, pitting, and crevice corrosion in chemicals containing chlorides and sulfuric, phosphoric, and nitric acids.
  • Nickel content aids in chloride ion stress and corrosion resistance.
  • Additions of Copper and Molybdenum provide resistance to hostile environments, pitting, and crevice corrosion.
  • Chromium adds to its resistance of oxidizing environments such as nitric acids.
  • Columbium reduces the effects of carbide precipitation.

2. Alloy 20 Pipe Weldability:

  • All commonly used welding methods, with the exception of oxyacetylene, can be successfully used.
  • The presence of Columbium tends to minimize the precipitation of carbides in the heat-affected zone, so the material may be used in the as-welded condition in most cases.
  • Pre-heating is not required.

3.Alloy 20 Pipe Heat Treament:

  • Cannot be hardened by heat treatment.
  • Stabilized-annealing is done at 1750-1850°F, followed by water quenching.
  • Stress relieving can be performed on annealed material up to 950°F.

4. Alloy 20 Pipe Machinability:

Because of Alloy 20′s high work-hardening rate the following are required:


  • Only low surface-cutting speeds are possible compared with low-alloy standard austenitic stainless steel.
  • Tools should be engaged at all times.
  • Heavy feeds are important in getting below the work-hardened ‘skin’.

Marking and packaging of Alloy 20 Pipes

The packaging of our products (eg. weathered corrugated steel, weathering corrugated steel,corten steel columnl,hot rolled stainless steel plate) ensures that they will not be damaged during transport. For export purposes, the usual export packaging is done in wooden crates or crates. All hr sheet metal, plates and coils are marked with a logo (company mark), grade, size and batch number. On request, we can customise the marking on the product,such as spcc cold rolled steel.


The Applications of Alloy 20 Pipes

Alloy 20 was originally designed for use in sulfuric acid related applications; however, it is now frequently used in a wide variety of industries. Applications that commonly use Alloy 20 include:

  • Chemical and allied industries
  • Food and dye production
  • Heat exchangers
  • Explosives
  • Tanks
  • Valves
  • Pickling racks
  • Manufacture of synthetic rubber and plastics
  • Pharmaceuticals
  • SO2 scrubbers and other severe environments

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