Shree Viratra Enterprises is one of India’s leading manufacturers of premium Stainless Steel 321/321H Sheets, Plates, and Coils utilised in numerous industries. Alloy 321/321H Sheets and Plates’ weldability is frequently compared to that of Alloy 304 and 304L. An important advancement is the inclusion of titanium, which reduces or completely eliminates carbide precipitation during welding. The austenitic class of these SS 321/321H Plates is commonly thought to be weldable utilising conventional fusion and resistance methods. In the interim, special care must be taken when working with these SS 321/321H Welded Plates to make sure that ferrite forms in the weld deposit to prevent weld “hot cracking”.

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How do Stainless Steel 321/321H plates differ from other stainless steel grades?

Stainless Steel 321/321H plates differ primarily from other stainless steel grades in composition and properties. Unlike standard austenitic stainless steels, such as 304 and 316, which contain only 18% chromium and no nickel, Stainless Steel 321/321H contains higher levels of both chromium and nickel, along with the addition of titanium. This titanium addition stabilizes the material against sensitization and subsequent intergranular corrosion, making it suitable for elevated temperature applications. Additionally, Stainless Steel 321H has a higher carbon content than Stainless Steel 321, which increases its high-temperature strength but may also decrease its resistance to sensitization. Therefore, while both grades offer excellent corrosion resistance and high-temperature strength, Stainless Steel 321H is often preferred for applications with higher temperatures. At the same time, Stainless Steel 321 is suitable for general-purpose use.

Can Stainless Steel 321/321H plates be used in aerospace applications?

Stainless Steel 321/321H plates can be used in aerospace applications. These grades of stainless steel offer excellent corrosion resistance, high-temperature strength, and durability, making them suitable for various aerospace components and structures. Stainless Steel 321/321H’s resistance to high temperatures and oxidation, as well as its ability to withstand harsh environments, make it ideal for use in aerospace applications where reliability and performance are critical. Components such as exhaust systems, turbine engines, heat exchangers, and structural components often utilize Stainless Steel 321/321H plates due to their exceptional properties and reliability in aerospace environments.

What are the available finishes for Stainless Steel 321/321H sheets?

Stainless Steel 321/321H sheets offer versatile finishes to suit diverse needs. Options include No. 1 for hot rolled, 2B for cold rolled with a smooth appearance, BA for a reflective surface, No. 4 for a brushed finish, No. 8 for a mirror-like look, and Hairline for fine parallel lines.

What are the advantages of using Stainless Steel 321/321H sheets over other materials?

Stainless Steel 321/321H sheets offer exceptional corrosion resistance, high-temperature strength, durability, and versatility. They can be easily formed, welded, and machined to meet various application requirements, providing cost-effectiveness and aesthetic appeal. Additionally, their recyclability makes them an eco-friendly choice, reducing environmental impact.

Are Stainless Steel 321/321H coils suitable for use in marine environments?

Stainless Steel 321/321H coils are suitable for use in marine environments. They offer excellent corrosion resistance, even in highly saline and corrosive marine atmospheres. Their durability and resistance to pitting and crevice corrosion make them ideal for marine applications such as marine equipment, boat fittings, and offshore structures.

Can Stainless Steel 321/321H coils be used in nuclear applications?

Stainless Steel 321/321H coils are suitable for nuclear applications. Their excellent corrosion resistance, high-temperature strength, and durability make them ideal for use in nuclear reactors, fuel handling systems, and other critical components where reliability and performance are paramount.

Specification of Stainless Steel 321/321H Sheets, Plates, Coils

Specifications : ASTM A240 / ASME SA240

Dimensions : ASTM, ASME, and API

Width 1000mm, 1219mm, 1500mm, 1800mm, 2000mm, 2500mm, 3000mm, 3500mm, etc

Thickness: 4mm-100mm

Length : 2000mm, 2440mm, 3000mm, 5800mm, 6000mm, etc

Surface Finish : 2B, 2D, BA, NO.1, NO.4, NO.8, 8K, mirror, chequered, embossed, hairline, sand blast, Brush, etching, Hot rolled plate (HR), Cold rolled sheet (CR), SATIN (Met with Plastic Coated) etc

Hardness : Soft, Hard, Half Hard, Quarter Hard, Spring Hard etc.

Form : Coils, Foils, Rolls, Plain Sheet, Shim Sheet, Perforated Sheet, Chequered Plate, Strip, Flats, Blank (Circle), Ring (Flange) etc.

Equivalent Grades of Stainless Steel 321/321H Sheets, Plates and Coils

STANDARD	UNS	WERKSTOFF NR.	AFNOR	EN	JIS	BS	GOST
SS 321	S32100	1.4541	–	X6CrNiTi18-10	SUS 321	–	–
SS 321H	S32109	1.4878	–	X12CrNiTi18-9	SUS 321HH	–	–

SS 321/321H Chemical Composition

Grade	C	Mn	Si	P	S	Cr	N	Ni	Ti
SS 321	0.08 max	2.0 max	1.0 max	0.045 max	0.030 max	17.00 – 19.00	0.10 max	9.00 – 12.00	5(C+N) – 0.70 max
SS 321H	0.04 – 0.10	2.0 max	1.0 max	0.045 max	0.030 max	17.00 – 19.00	0.10 max	9.00 – 12.00	4(C+N) – 0.70 max

Stainless Steel 321/321H Sheets, Plate, Coils Mechanical Properties

Density	Melting Point	Tensile Strength	Yield Strength (0.2%Offset)	Elongation
8.0 g/cm3	1457 °C (2650 °F)	Psi – 75000 , MPa – 515	Psi – 30000 , MPa – 205	35 %

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