Alloy 321/321H Technical Information
Robert-James Sales, Inc.
Robert-James Sales, Inc.
Technical Information
  Piping Definitions Tube Stainless Steel Alloys Specifications Conversion Calculators 


Alloy 20
Alloy C-276
6061 T6
Alloy 200
Alloy 400
Alloy 600
Alloy 625
Alloy 800/800H/800HP
Alloy 825


Chemical Composition %

C Cr Mn Ni P S Si Ti
Max   Max   Max Max Max  
0.08 17.0-20.0 2.0 9.0-13.0 0.04 0.30 0.75 Trace *
* The titanium content shall not be less than 5 times the carbon content and not more than 0.60% Note: 321 H requires the titanium content to be not less than 4 times the carbon content and not more than 0.60%

Seamless Pipe 1/2" - 16"
Weld Pipe 6" - 12"
Bar 1" - 12"
Butt-Weld Flanges 1/2" - 8"
Flanges 1/2" - 8"

A312, A403, A182, A479, A276
SA312, SA403, SA182, SA479, SA276

These titanium bearing stainless steels are stabilized against carbide precipitation and designed for operation within the damaging temperature range where carbide precipitation develops. In this type of steel, the carbon combines preferentially with titanium to form a harmless titanium carbide, leaving the chromium in solution to maintain full corrosion resistance. Type 321 is basic type 304 modified by adding titanium in an amount at least 5 times the carbon plus nitrogen contents.

• Immune to intergranular corrosion when
heated within the carbide precipitation range.
• Titanium addition eliminates the formation of
chromium carbides at the grain boundaries by
tying up the carbon and nitrogen as titanium
carbides or nitrides.
Better high temperature properties than 304 or
304L. Generally used for parts which are intermittently heated up to 1500 deg.F. For
continuous service the alloy is good to 1650 deg.F.
• May be susceptible to chloride stress cracking.
• Excellent weldability in field.
• Type 321 H has high carbon (.04 - 10) for better high temperature creep properties.

High temperature chemical process heat exchanger tubes Refineries High temperature steam service

Tensile Strength (KSI) 75
Yield Strength (KSI) 30

KSI can be converted to MPA (Megapascals) by multiplying by 6.89

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