Name: Stainless Steel 321/321H Pipes
Brand: Solitaire Overseas

Stainless Steel 321/321H Seamless & Welded Pipes Manufacturer in India

Alloy 321 is a titanium-stabilized austenitic SS known for its superior general corrosion resistance. It performs exceptionally well against intergranular corrosion, even when exposed to temperatures between 427°C and 816°C where chromium carbide precipitation occurs. This alloy resists oxidation up to 816°C and exhibits high creep and stress rupture resistance, along with good toughness at low temperatures. The 321H stainless steel variant, with its higher carbon content, is engineered to offer enhanced strength at temperatures above 537°C. This makes SS321/SS321H pipes and tubes particularly valuable, as they often meet dual certification requirements.

Solitaire Overseas excels as a premier 321 stainless steel pipe supplier, providing top-quality Stainless Steel Pipes & tubes. Our alloy 321 pipe offerings are manufactured to meet rigorous national and international standards. We supply a broad range of SS321 and SS321 material in various sizes, wall thicknesses, lengths, and diameters. Our products are available in customized specifications to suit specific needs and are offered at competitive market rates for both global and national clients.

In addition to AR Plates, we also provide Stainless Steel 347/347H Pipes, designed to meet the highest industry standards for various industrial applications.

Stainless Steel 321 Pipes

321 Stainless Steel Seamless Tubing offers superior strength and durability due to its seamless construction. Manufactured from a single piece of steel, these pipes withstand extreme temperatures (800-1500°C) and are ideal for demanding applications like boilers, jet engines, and exhaust systems. 321 SS Welded pipes are also available, offering excellent creep resistance and preventing post-welding issues.

Stainless Steel 321H Pipes

321H stainless steel is a stabilized austenitic stainless steel designed for high-temperature service (427-816°C / 800-1500°F). It resists carbide precipitation, remains non-magnetic in the annealed condition, and can be hardened by cold working.

Features it possesses -

As the SS321/SS321H pipes are manufactured using pure quality of stainless steel alloy, it tends to offer many good attributes. It is like durability, flexibility, toughness, high durability, longevity, high tensile strength, good dimensional accuracy, fine surface finishes etc. Also, it is having greater resistant ability against pitting, corrosion, oxidation, stress corrosion cracking and crevice corrosion.

Testing -

Positive material identification test, intergranular corrosion test, pitting resistant test, mechanical test, chemical test, macro/micro test, flattening/flaring test are tests conducted.

Documents provided -

Heart treatment chart, quality assurance plan, commercial invoice, certificate of origin, raw material test report, material traceability report etc are a few essential documents provided to the buyers. Additionally, the other documents like MTC as per EN 10204/3.1B, TC like radiography test report and the third party test report are provided.

Packaging -

SS321/SS321H pipes are packed in wooden cases/pallets, bundles only to assure safer and harmless shipping of the product to its buyers.

CONTACT US TO GET QUOTE FOR YOUR REQUIREMENT.

Our global reach guarantees on-time delivery, cost-effectiveness, and full compliance with industry standards, so your production stays on track.

SS Stainless Steel 321/321H Pipes Specifications

Specification

Specifications

ASTM A312, A358 / ASME SA312, SA358

Dimensions

ASTM, ASME and API

Seamless Pipe Size

1/2″ NB – 16″NB

ERW Pipe Size

1/2″ NB – 24″ NB

EFW Pipe Size :

6″ NB – 100″ NB

Outside Diameter :

6.00 mm OD up to 914.4 mm OD, Sizes up to 24” NB available

Length

Single Random, Double Random & Required Length

Thickness

0.3mm – 50 mm

Schedule

SCH20, SCH30, SCH40, STD, SCH80, XS, SCH60, SCH120, SCH140, SCH160, XXS

Type

Seamless, Welded, ERW, EFW

Form

Round Pipes, Square Pipes, Rectangular Pipe

End

Plain End, Beveled End, Treaded

Stainless Steel 321/321H Pipes Equivalent Grades

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

SS 321/321H Pipes Chemical Composition

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

Stainless Steel 321/321H Pipes Mechanical & Physical Properties

Element	SS 321/321H
Density	8.0 g/cm3
Melting Point	1457 °C (2650 °F)
Tensile Strength	Psi – 75000 , MPa – 515
Yield Strength (0.2%Offset)	Psi – 30000 , MPa – 205
Elongation	35 %

Stainless Steel 321/321H Pipe Application

SS 321 Pipes in various Application Industries

Food Processing Industry

Fabrication Industry

Oil and Gas Industry

Chemical Industry

Plumbing

General Purpose Applications

Heating

Water Supply Systems

Power Plant

Paper & Pulp Industry

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FAQ

What is the difference between SS 321 and 321H?

The key difference between SS 321 and 321H is carbon content: SS 321 has a maximum of 0.08% carbon, while 321H ranges from 0.04% to 0.10%. Both have similar compositions.

What is a 321 stainless steel tube?

321 stainless steel is a heat-resistant grade known for its good corrosion resistance and strength at high temperatures. This austenitic alloy maintains toughness and overall strength even at cryogenic temperatures, making it suitable for a range of high-temperature applications.

What is type 321 stainless steel?

321 stainless steel, a titanium-stabilized austenitic grade, offers similar corrosion resistance to 304/304L.

Is 321 stainless better than 316?

The best choice between 321 and 316 stainless steel depends on your needs. For high-temperature strength and weld stability, 321 is the better option. If corrosion resistance in harsh environments like chemical processing or marine settings is paramount, 316 steel is the preferred choice.