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Stainless Steel 321/321h Seamless U Tube Manufacturer.
SEAMLESS: DIN 1.4541 U Tube | UNS S32100 U Tube | JIS SUS 321 U Tube | ASTM A213 TP321h U Tube | BS 321S31 U Tube | EN X6CrNiTi18-10| DIN 1.4878 U Tube

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Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry’s standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.
Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry’s standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.
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Stainless Steel 321/321h Seamless U Tube Chemical Composition
Grade | Range | Ni | Cr | P | C | Mn | N | Si | S | Ti |
---|---|---|---|---|---|---|---|---|---|---|
321 | Min. | 9.0 | 17.0 | 0 | – | – | – | – | – | – |
Max. | 12.0 | 19.0 | 0.045 | 0.08 | 2.0 | 0.10 | 1.0 | 0.030 | 5(C+N) -0.70 | |
321H | Min. | 9.0 | 17.0 | – | 0.04 | – | – | – | – | – |
Max. | 12.0 | 19.0 | 0.045 | 0.010 | 2.00 | 0.10 | 1.00 | 0.030 | 4(C+N) -0.70 |
SS 321/321h Seamless U Tubes Mechanical Properties
Grade | Tensile Strength min (MPa) | Yield Strength 0.2% Proof min (MPa) | Hardness | Elongation (% in 50mm) min | |
---|---|---|---|---|---|
Brinell max (HB) | Rockwell B max (HR B) | ||||
321/321h | 515 | 205 | 217 | 95 | 35% |
SS ASTM A213 TP321h Seamless U Tubing Equivalent Grades
Grade | UNS No | Old British | Euronorm | Japanese JIS | Swedish SS | GOST | ||
---|---|---|---|---|---|---|---|---|
BS | En | No | Name | |||||
321 | S32100 | 321S31 | X6CrNiTi18-10 | 1.4541 | – | SUS 321 | 2337 | – |
321h | S32109 | 321S51 | X10CrNiTi18-10 | 1.4878 | – | SUS 321h | – | – |
321/321h Stainless Steel Seamless U Tubes Standard Specifications
Spec. No.
Title
Scope
ASTM A213
Seamless Ferritic Stainless Steel and Austenitic Stainless Steel Tubes.
Pressure tubes, made from 16 grades of austenitic stainless steel and from 12 grades of ferritic Cr-Mo Alloy Steel.
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Size Range
- Outer Diameter: 12.70 mm OD to 50.80 mm OD
- Wall Thickness: 0.71 mm – 5.0 mm
- Length: Up to 30mtr long
- Specifications: ASTM, ASME, DIN EN (GERMAN), NF (AFNOR), JIS (JAPAN)
Supply Condition
- Bright Annealed / Solution Annealed & Passivated
Features
- Ability to supply tubes with stringent NDT Testing, Special Chemistry, Lower Residual Stress values.
- OD Polishing : Grit Polish from 120 to 600.
- Closer Dimensional Tolerance & higher Corrosion Resistance etc.
321/321h SS Seamless U Tube Quality Control
To ensure a quality product, MPJ is holding certificate ISO 9001:2015, ISO 45001, OHSAS 14001, & CE-PED. We are also members of various renowned agencies and Chambers of Commerce including MASSMA, EEPC, FICCI, FIEO, Indian Merchants Chamber, etc. With state-of-the-art manufacturing processes, contemporary technologies, and proficient services, we consider: offering the finest quality, best in class products. Compliance with specifications as per standards, Outer Diameter, Thickness, Inside Diameter, Inside Finish, Marking, Ends, and Finishing. This ensures that we never face a rejection of the Stainless Steel 321h Seamless U Tube supplied.
Brand – 
SS 321 Seamless U Tubing are marked in requirement of the international standards. Format: ” BRAND-SIZE-SPECIFICATION-GRADE-HEAT NUMBER-LOT NUMBER “
This marking helps for the identification of the seamless u tube and supported with the Material Test Report. It is 100% traceable to our mill.
Available Stainless Steel Seamless U Tubing Grades
- Stainless Steel 304 Seamless U Tubes
- Stainless Steel 304H Seamless U Tubes
- Stainless Steel 304L Seamless U Tubes
- Stainless Steel 310 Seamless U Tubes
- Stainless Steel 310H Seamless U Tubes
- Stainless Steel 310S Seamless U Tubes
- Stainless Steel 316 Seamless U Tubes
- 253ma Stainless Steel Seamless U Tube
Stainless Steel 321 SMLS U Tubes Packing & Documentation

ASTM A213 TP321h Seamless U Tubes are surface wash and clean to remove all impurities and stock in the warehouse. Then it is wrapped in thin plastic and also it ends are protected by plastic caps to avoid any damage in transit. Stainless Steel 321 Seamless U Tube is bundled in bubble wrap followed by assorting them in colored plastic bundles. An outer rope is tied to protect the tubing and they are packed in wooden box or container.
MPJ Provide Stainless Steel 321 Seamless U Tube and SS 321h Seamless U Tubes with all necessary documents such as commercial invoice, packing list, Test Reports, HS Code, Country of Origin attested by the chamber of commerce, Fumigation Certificate, Warranty Letter, and Base Material Certificates. Every lot is supplied with a material test certificate as per EN 10204 NACE 3.1 standards indicating the chemical and mechanical properties of the Seamless U Tubes.
We also confirm the guarantee of the seamless u tubes supplied as per Purchase order specifications and attest the same in the Material Test Certificate. We also welcome any third party inspection from an agency nominated by the customer to comply with NACE 3.2 Certification if required by the customer at an extra cost.
SS 321/321h Seamless U Tube Application Industries
- Oil & Gas Exploration
- Petrochemicals and Refineries
- Cross Country Pipe Line for Gas & Water
- Pipes for Engineering purpose
- Thermal, Nuclear and Solar Power Plants
- Desalination Plants
- Chemical Industries
- Aerospace
- Atomic Energy
- Pharmaceutical
- Food and Dairy
- Automobile
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