ASTM A240 Alloy 321/321H is a titanium-stabilized austenitic stainless steel with excellent high-temperature strength and corrosion resistance, particularly good resistance to intergranular corrosion after welding.These two materials are widely used in petrochemical, aerospace, and heat exchanger applications. They also possess good weldability and formability, making them easy to process and install.

As a leading stainless steel plate manufacturer and supplier with over 18 years of export experience and serving more than 80 countries, GNEE produces ASTM A240 Grade 321H steel plates that can be used in high-temperature environments, withstanding temperatures up to 816 degrees Celsius. 321 and 321H stainless steel plates are titanium-stabilized austenitic heat-resistant alloys conforming to ASTM A240 standards, offering excellent high-temperature resistance and corrosion resistance. 321H is a high-carbon version of 321, suitable for higher temperature environments and commonly used in oxidizing conditions below 800℃. 321H stainless steel plates are used in the food processing industry and for the manufacture of storage tanks in chemical plants. This material is also used in the transportation industry.

Grade 321H steel plates

321 Stainless Steel Sheet Manufacturing Process

321 Stainless Steel Sheet Manufacturing Process

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Specifications

Item	321 stainless steel sheet,304 stainless steel plate
Standard	ASTMA240,GB/T3280-2007,JIS4304-2005,ASTM A167,EN10088-2-2005,etc
Material	316,301,304,304L,305,316L,316N,316LN,316Tli,309S,310S,321,347,347H,
Width	1000mm, 1219mm, 1500m, 1800mm,2000mm,2500mm,3000mm,etc
Thickness	0.3mm-150mm
Length	2000mm,2440mm,2500mm,3000mm,5800mm,6000mm,etc
Package	Standard export seaworthy package.or as required
Price term	Ex-Work .FOB.CIF.CNF.CFR.etc
Payment term	L/C,T/T,West Union or as required
Delivery	Normally according to the order quantity or as required

Composition Standard of ASTM A240 Grade 321H Plate

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

SS 321 Perforated Sheets Mechanical Characteristics

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 %

ASTM A240 Alloy 321 vs. 321H: Differences
The main difference between the two lies in their carbon content: 321 has a standard carbon content (≤0.08%), while 321H (0.04-0.10%) has higher creep strength and is suitable for higher temperatures. Both grades are available in hot-rolled plate form.

We offer: stock sizes of sheet and slab, stock lengths of round bars, custom-length sheet and slab, custom-length round bars, cold forming of sheet and slab and round bars, and any other necessary processing services. For any questions, please click the link below to contact us!

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ASTM A240 Grade 321H strip and SS 321 Plate Supplier

All sheets undergo pickling and passivation treatments to form a uniform protective film, are 100% visually inspected to ensure freedom from scratches, pits, and other surface defects, and are verified through mechanical property testing to guarantee processing reliability.

Highest quality GNEE packaging and shipping

The products are packaged in wooden crates or on pallets suitable for sea transport, with measures taken to prevent moisture, rust, and edge damage. The heat number and dimensions are clearly marked on the plates. Shipment can be made within 7-10 days, and customized sizes can be shipped within 15-25 days. A complete factory test certificate (MTC 3.1) is provided.