November 20, 2018

Stainless Steel SS321

SS321 is not a Casting Grade in ASTM A351 and A743 standard, just listed in ASTM A182 and ASTM A240. SS321 contains titanium for chromium carbide stabilization. Generally Ti will oxidize rapidly in the melt if exposed to air in typical sand/investment casting processes, but based on the little content, it’s no problem in our Casting process.

We will follow the SS321 Casting material as below standard.

Casting Quality Industrial provide Sand Casting and Precision Investment Casting for this special stainless steel.

Stainless Steel Impellers by Lost Wax Precision Investment Casting

Our Services

  1. Sand Casting

    Casting Quality focus on Metal Parts industry, we provide professional service in Metal Casting field.

    Sand Casting is a popular metal form method, are suitable for all materiel, such as grey iron, ductile iron, malleable iron, carbon steel, stainless steel, aluminum and bronze.

  2. Investment Casting

    also named as precision lost wax casting, mainly suitalbe for carbon steel and stainless steel parts. We also provide grey iron and ductile iron and aluminum and bronze parts by investment casting. It can achieve the best appearance with good tolerance

  3. Shell Casting

    Shell casting method is a good option to replace investment casting and sand casting. the quality is better than sand casting parts, suitable for bulk production.

  4. CNC Machining

    CNC Milling, CNC turning with 5 xix CNC center, we provide precision machining for all castings based on customers design drawings.

  5. CAD Design

    Mechanical Design service based on customers requirement, our software is Solidworks and AutoCAD.

  6. Tools/Mold Design

    Mould design and production will be served for metal casting ad plastic injection industry.  Based on our more than 10 years experience, we supply professional molds for our customers in Europe and North American.

Stainless Steel SS321 Description

Similar Metal grade in different application:


ASTM A240 – Standard Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications

ASTM A182 -Standard Specification for Forged or Rolled Alloy-Steel Pipe Flanges, Forged Fittings, and Valves and Parts for High-Temperature Service

SS321 Chemical Composition Requirements, %

ASTM 182F321S321000.082.000.0450.0301.009.0-12.017.0-19.00.70
ASTM A240321S321000.082.000.0450.0300.759.0-12.017.0-

Grade F 321 shall have a titanium content of not less than five times the carbon content and not more than 0.70 %.
Grade F 321H shall have a titanium content of not less than 4 times the carbon content and not more than 0.70 %.
Grade SS321:  Ti 5 x(C+N), MIN, 0.70 max)
Grade SS321H: Ti 4 x (C+N) min, 0.70 max)

SS321 Mechanical Test Requirements

StandardGradeUNSTensile KsiTensile MpaYield KsiYield MPaElongationReductionHardness BrinelHardness Rockwell B
ASTM 182F321S3210075515302053050
ASTM A240321S32100755153020540.021795


SS321 Heat treatment process: Solution treat and Quench, Heat to 1900°F [1040°C] minimum, hold for sufficient time to heat casting to temperature, quench in water or rapid cool by other means (Quenching cool below 500°F [260°C])

Manufacture process in Qingdao Casting Quality company: Sand Casting, Precision Investment Casting (Lost Wax Casting).

Why Choose Stainless Steel 321?

Sometime, SS321 is basic austenitic stainless steel 304 with Titanium content, but SS321 has better property in application in temperature up to 900°C. Titanium gives it greater inter-granular corrosion resistance; this grades perform well in the 425-900 °C range. 304L is not good for high temperature strength, mainly for resistance to intergranular corrosion.

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