SS 321 Seamless Pipe

1. Standard: ASTM A312 / ASME SA312、ASTM A213/ASME SA213、ASTM A269/ASME SA269
2. Size: 6mm-830mm
3. Thickness: 0.5mm-30mm
4. Equivalent：UNS S32100, WNR.1.4541, AISI 321, SUS 321

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Product Introduction

Our SS 321 Seamless Pipe is a standard 18/8 austenitic chromium-nickel alloy with the addition of titanium, a stabilized version of 304 grade stainless steel, making it an excellent choice for high temperature environments. The alloy is resistant to intergranular corrosion and can be used anywhere from 430 to 816°C. This grade can work at extreme temperatures and even at cryogenic levels. SS 321 Seamless Pipe has no weld seams when hot or cold rolled, giving it greater strength than welded applications.

SS 321 Seamless Pipe Applications:

Refinery equipment
Industrial boilers
Pressure vessels
Chemical industry
Pharmaceutical equipment
Petrochemical refineries
Chemical process heat exchangers

ASTM A312 TP 321 Stainless Steel Seamless Pipe Specification

ASTM / ASME Name	ASTM A 312 ASME SA 312 / ASTM A 213 ASME SA 213
Dimensions Standard	ASTM, ASME and API
Stainless Steel 321 Seamless Pipes Size Range	0.5″ NB – 16″ NB
OD Sizes	0.5″NB TO 30″NB IN
Specialized in	Large Diameter Size
Schedule	SCH20, SCH30, SCH40, STD, SCH80, XS, SCH60, SCH80, SCH120, SCH140, SCH160, XXS
Frequently Used Type	Seamless
Available Pipes Form	Round
Length	Single Random, Double Random & Cut Length.
End Finishing	Plain End, Beveled End, Treaded End

Chemical Composition Of ASTM A312 TP 321 Stainless Steel Seamless Pipe

Grade		C	Mn	Si	P	S	Cr	Mo	Ni	N	Other
321	min. max	– 0.08	2.00	0.75	0.045	0.030	17.0 19.0	–	9.0 12.0	0.10	Ti=5(C+N) 0.70

SS 321 Seamless Pipes Mechanical Properties

Grade	Tensile Strength (MPa) min	Elongation (% in 50mm) min	Yield Strength 0.2% Proof (MPa) min	Hardness
				Rockwell B (HR B) max	Brinell (HB) max
321	515	40	205	95	217