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321 Stainless steel
Type 321 stainless steel is similar to Type 304 stainless steel, however, it contains a Titanium addition of at least five times the carbon content. This addition is made to reduce or eliminate chromium carbide precipitation - resulting from welding or exposure to high temperatures. Maximum stabilization is accomplished by annealing between 1750° and 1850° F. Type 321 has extensive use in aircraft parts, such as exhaust systems where operating temperatures are higher than 800° F. and where corrosive conditions are not too severe; also because of its resistance to scaling and vibration fatigue.
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321 Stainless steel Composition
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321 Stainless steel chemical composition
C Si Mn P S Ni Cr others
≤0.08 ≤1.00 ≤2.00 ≤0.045 ≤0.030 9.00-12.00 17.00-19.00 Ti 5C-0.70
321 Stainless steel Mechanical Properties
Mechanical Property Hardness Value
Sample state Rm MPa Rp0.2   MPa A % Z % HBW HRB HV
solid solution ≥520 ≥205 ≥40 ≥50 ≤187 ≤90 ≤200
321 Stainless steel equal standard
GB/T1220 ISO/TS15510 TOCT 5632 JIS G4403 EN 10088-1
06Cr18Ni11Ti X6CrNiTi18-10 08X18H10T SUS321 6CrNiTi18-10
321 Stainless steel Classification
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  • ASTM A959 321 (S32100) is an austenitic stainless steel. These properties are specified for flat rolled product (plate, sheet and coil) in ASTM A240/A240M. Similar but not necessarily identical properties are specified for other products such as pipe and bar in their respective specifications.
  • Cold rolled 321 stainless steel coil: The thickness are max 3mm
  • Hot rolled 321 stainless steel coil ; the common size Thickness are: 2.5-14mm.
  • For seamless steel pipe, the common diameter : 21-630mm, Wall thickness for:4-500mm.
  • 321 Stainless steel pipe。 thickness:21-630mm, Wall thickness:4-500mm.
  • 321 stainless round bar common size: 5.5-250mm
  • 321 Stainless steel Application
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    321 Grades comparison
    Grades 321 and 347 are the basic austenitic 18/8 steel (Grade 304) stabilised by Titanium (321) or Niobium (347) additions. These grades are used because they are not sensitive to intergranular corrosion after heating within the carbide precipitation range of 425-850°C. Grade 321 is the grade of choice for applications in the temperature range of up to about 900°C, combining high strength, resistance to scaling and phase stability with resistance to subsequent aqueous corrosion.
    321 Stainless steel Application
    1.Aircraft Exhaust Stacks and Manifolds
    2.Chemical Processing Equipment
    3.Welded Equipment
    4.Jet Engine Parts
    5.Aircraft exhaust manifolds
    6.Expansion joints,Bellows
    7.Furnace parts, Heating element tubing
    8.Heat Exchangers
    9.Woven or welded screens for high temperature mineral processing
    10.Spiral Welded tube for burner pipes and flues
    321 Stainless steel surface finish
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    2B : Those finished, after cold rolling, by heat treatment, pickling or other equivalent treatment and lastly by cold rolling to given appropriate luster.

    BA : Those processed with bright heat treatment after cold rolling.

    NO.3 : Those finished by polishing with No.100 to No.120 abrasives specified in JIS R6001.

    NO.4 : Those finished by polishing with No.150 to No.180 abrasives specified in JIS R6001.

    HL : Those finished polishing so as to give continuous polishing streaks by using abrasive of suitable grain size.

    NO.1 : The surface finished by heat treatment and pickling or processes corresponding there to after hot rolling.


    • 2B

    • BA

    • NO.4

    • NO.1

    • NO.3

    • HL
    321 Stainless steel equipment and Machining
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    321 Stainless steel case
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    321 Stainless steel Packing
    1 . Packaging material: kraft paper, waterproof paper, seaworthy packing, wooden or steel support and so on.
    2 . Package purpose: to protect the product during the transportation, shipment or flight.
    321 Stainless steel case
    In 2012, One of our customer coming from OrisOxin Co. in Iran come to visit our company. They are mainly for chemical processing equipment. They want 321 Stainless steel for 300 ton for their production. But the price are not good for their cost. With the help of technical person from bebon, they know much about the mechanical of this material, Which is the best choice the equipment. They at last choose our company as the supplier. They choose bebon not only for the low price and best quality but also for our professional service.
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