Custom 321 Stainless Steel Prefabricated Pipe Spools
As a professional stainless steel pipe spools supplier, we produce high quality custom 321 stainless steel prefabricated pipe spools.
Grade 321 is a kind of austenitic stainless steel with good wear resistance, high temperature resistance, creep resistance, etc. The good wear resistance of 321 stainless steel is manifested in organic acids and inorganic acids of different concentrations and different temperatures, especially in oxidizing media. Meanwhile, grade 321 is also a refractory steel with better high temperature resistance than 316L. Its performance is very similar to that of 304; but since Ti is added as the stabilizing element, 321 stainless steel features better high temperature strength and intergranular corrosion resistance, and it can effectively control the formation of chromium carbide as a result.
The 321 pipe spool is a kind of pipe fittings manufactured by forming 321 welded pipes and fittings. We manufacture 321 pipe spool strictly according to ASTM standard.
Our factories and fabrication facilities are filled with highly skilled craftsmen, pipe fitters, pipe fabricators, pipe welders with excellent safety and quality performance records. We take great pride in not only meeting, but exceeding our customers’ expectations in all areas, including performance, design, logistics, schedule, delivery and cost.
Your Trusted Custom 321 Stainless Steel Prefabricated Pipe Spools Manufacturer In China
Seather specializes in the manufacturing of nickel alloy and custom pipes spools products for a wide range of industries, including aerospace, petrochemical, power generation, marine, chemical processing and many others.
Seather’s products are known for their superior strength, durability, and resistance to corrosion, making them ideal for use in demanding and harsh environments.
Seather provides a complete range of services, from consultations and analysis to design, quality assurance, and global logistics. The company’s experienced team of engineers and technicians work closely with customers to understand their needs and provide customized solutions to meet their unique requirements.
Whether it’s a simple fabrication project or a complex multi-phase project, Seather has the expertise and experience to deliver quality results.
If you want to purchase custom 316L stainless steel flanged spooled pipes, why not contact us here for saving your time and money?
Custom 321 Stainless Steel Prefabricated Pipe Spools Specifications
| Product Name | Custom 321 Stainless Steel Prefabricated Pipe Spools |
| Raw Materials | 321 (UNS S32100 / W.Nr. 1.4541) |
| Size | 114mm to 2500mm Diameter (Seamless & Welded, Fabricated), Wall Thickness: 10s/3 mm to XXS/70 mm; Customized or according to your drawing |
| Samples | Sample available |
| Tolerance | +/-5mm to +/-0.005mm |
| Testing Equipment | CMM; Tool microscope; multi-joint arm; Automatic height gauge; Manual height gauge; Dial gauge; Marble platform; Roughness measurement |
| Logo | Custom logo available |
| Surface Treatment | Anodizing, Passivation, Polishing, Plating, Painting, Black Oxide, Powder Coating, Brushing, Heat Treatment, Surface Phosphating, Hot Dip Galvanizing, More Surface Treatment, etc. |
| Color | Silver, black, gold, red, green, blue, purple, etc |
| File Formats | UG, SolidWorks, Pro/E, AutoCAD (DXF, DWG), PDF, TIF, JPG, etc |
| Services | OEM/ODM, Engineering&Design Consulting, Assembly, Finishing, Materials Sourcing, Custom Packaging Services, etc |
| Quality System | ISO9001, SGS, TUV |
Custom 321 Stainless Steel Prefabricated Pipe Spools Chemical Composition
| Grade | Standard | C | Si | Mn | P | S | Cr | Ni | Mo |
| 321 | ASTM A240 | ≤0.08 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.030 | 17.00-19.00 | 9.00-12.00 | – |
Custom 321 Stainless Steel Prefabricated Pipe Spools Applications & Usages
- Lining and pipelines for wear-resistant acid containers and wear-resistant equipment;
- Petroleum waste gas combustion pipeline;
- Boiler casing, heat exchanger, furnace components;
- Muffler for diesel engine;
- Boiler pressure vessel;
- Chemical;
- Spiral welded pipe for furnace pipe and dryer;
Custom 321 Stainless Steel Prefabricated Pipe Spools Production Process
The production of custom spooled pipes involves several precise steps to ensure high quality, durability, and corrosion resistance. Below is a step-by-step breakdown of the process:
1. Material Selection & Inspection
Raw Material: pipes and fittings are sourced according to customer specifications.
Quality Check: The materials undergo chemical composition and mechanical property testing to ensure compliance with ASTM, or other relevant standards.
2. Cutting & Preparation
Pipes are cut to length using band saws, plasma cutters, or laser cutters, ensuring precision.
Edge preparation is performed to ensure smooth welding and proper flange fitting.
3. Flange Attachment & Welding
Flange Positioning: Stainless steel flanges (e.g., slip-on, weld neck, lap joint, or blind) are aligned with the pipe ends.
Welding Process:
TIG (GTAW) or MIG (GMAW) welding is commonly used for superior corrosion resistance.
Full penetration welds are applied to ensure structural integrity.
If required, purging with argon gas is used to prevent oxidation inside the pipe.
4. Post-Weld Treatment
Pickling & Passivation: Removes weld discoloration and restores the protective chromium oxide layer.
Solution Annealing (if needed): Enhances corrosion resistance and mechanical properties.
5. Dimensional & Non-Destructive Testing (NDT)
Dimensional Inspection: Ensures pipe length, flange alignment, and tolerances are within specification.
Hydrostatic Testing: Pipes are tested under pressure to check for leaks.
X-ray (Radiographic) or Ultrasonic Testing: Detects internal weld defects.
Dye Penetrant Test (DPT): Identifies surface cracks.
6. Surface Finishing & Coating (Optional)
Bead blasting or mechanical polishing for a smooth finish.
Electropolishing for ultra-clean applications (e.g., food & pharma industries).
Epoxy or anti-corrosion coatings for harsh environments.
7. Marking & Documentation
Pipes are laser-etched or stamped with heat number, material grade, size, and standard compliance.
A mill test certificate (MTC) is provided for material traceability.
8. Packaging & Delivery
Flanged pipes are protected with plastic caps and packed using wooden crates or pallets for safe transportation.
If required, pipes are pre-assembled with gaskets and bolts for easier installation at the site.
Your Reliable Custom 321 Stainless Steel Prefabricated Pipe Spools Manufacturer In China
Custom 321 Stainless Steel Prefabricated Pipe Spools: The Ultimate Guide
When you choose to buy Custom 321 Stainless Steel Flanged Spooled Pipes, there have some important points we need to know before we get started.
What are Custom 321 Stainless Steel Prefabricated Pipe Spools?
As a professional stainless steel pipe spools supplier, we produce high quality custom 321 stainless steel prefabricated pipe spools.
Grade 321 is a kind of austenitic stainless steel with good wear resistance, high temperature resistance, creep resistance, etc. The good wear resistance of 321 stainless steel is manifested in organic acids and inorganic acids of different concentrations and different temperatures, especially in oxidizing media. Meanwhile, grade 321 is also a refractory steel with better high temperature resistance than 316L. Its performance is very similar to that of 304; but since Ti is added as the stabilizing element, 321 stainless steel features better high temperature strength and intergranular corrosion resistance, and it can effectively control the formation of chromium carbide as a result.
The 321 pipe spool is a kind of pipe fittings manufactured by forming 321 welded pipes and fittings. We manufacture 321 pipe spool strictly according to ASTM standard.
Custom 321 Stainless Steel Prefabricated Pipe Spools standards comparison table
| 321 Stainless Steel Standards Comparison Table | ||||||||
| STS | USA | UNS | CHINA | EURONORM | RUSSIA | SWEDISH | JAPANESE | |
| GRADE | AISI/ASTM | NO | GB | NO | NAME | GOST | SS | JIS |
| 321 | 321 | S32100 | 0Cr18Ni11Ti | 1.4541 | X 6 CrNiTi 18 10 | 12KH18N10T | 2337 | SUS 321 |
Features of Custom Custom 321 Stainless Steel Prefabricated Pipe Spools
- Excellent formability: it can be easily cold formed by various methods such as bending or coining without any detrimental effect on its corrosion resistance
- Good machinability: it can be machined using conventional techniques
- Good weldability: it can be welded using conventional techniques
Looking For A Trust Custom 321 Stainless Steel Prefabricated Pipe Spools Manufacturer？
Contact us today and we’ll put together a quote tailored to your needs.
