321 (S32100) Stainless Steel Pipe/Tube – ASTM A312, A269, A270
321 Stainless Steel (Austenitic) is a premium-grade material manufactured to ASTM A312, A269, A270 standards, available in Pipe/Tube form with S32100 UNS designation. Produced through Seamless / Welded processes, this alloy delivers consistent mechanical properties and superior performance in demanding environments. Key applications include chemical processing piping, heat exchanger tubes, food grade tubing, serving industries such as Chemical Processing, Food & Beverage, Pharmaceutical. Core Metal Steel supplies 321 Pipe/Tube in full compliance with ISO 9001:2015, PED 2014/68/EU certifications, ensuring material traceability and quality assurance for critical service applications.
Product Specifications
| Material Family | Stainless Steel |
| Sub-Family | Austenitic |
| Grade | 321 |
| UNS Number | S32100 |
| Standard | ASTM A312, A269, A270 |
| Product Form | Pipe/Tube |
| Manufacturing Process | Seamless / Welded |
| Thickness Range | 0.5-30 mm (SCH 5S – SCH 80) |
| Width Range | N/A |
| Length Range | Up to 12000 mm |
Chemical Composition
| Element | Composition (%) |
|---|---|
| C | 0.08 max |
| Mn | 2.00 max |
| Si | 0.75 max |
| P | 0.045 max |
| S | 0.030 max |
| Cr | 17.0-19.0 |
| Ni | 9.0-12.0 |
| Ti | 5×C min-0.70 max |
Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength (MPa) | 515 min |
| Yield Strength (MPa) | 205 min |
| Elongation (%) | 40 min |
| Hardness (Brinell) | 217 max |
| Hardness (Rockwell B) | 95 max |
Key Features
- Manufactured in strict compliance with ASTM A312, A269, A270 specifications for guaranteed quality and performance
- Available in Seamless / Welded manufacturing processes to suit diverse application requirements
- Mechanical properties: 515 min tensile strength, 205 min yield strength
- UNS designation S32100 — fully traceable material with mill test certification
- Certified to ISO 9001:2015, PED 2014/68/EU standards for global market acceptance
- Available in seamless and welded configurations with various schedule ratings
Applications & Industries
| Application | Industry |
|---|---|
| Chemical processing piping | Chemical Processing |
| Heat exchanger tubes | Food & Beverage |
| Food grade tubing | Pharmaceutical |
| Pharmaceutical piping | Oil & Gas |
| Water treatment systems | Water Treatment |
| Oil and gas flowlines | Marine |
At Core Metal Steel, we maintain extensive inventory of 321 Stainless Steel Pipe/Tube products, ensuring rapid fulfillment for both standard and custom orders. Our Austenitic grade Pipe/Tube products are sourced from certified mills and undergo rigorous quality inspection before shipment.
The 321 grade is one of the most requested materials in the Stainless Steel category, valued for its balanced combination of chemical processing piping, heat exchanger tubes performance. Whether your project requires standard dimensions or custom specifications, our technical team provides comprehensive support from material selection through delivery.
Surface finish options for 321 Pipe/Tube include Pickled, Polished (180-600 Grit), Annealed, Bright Annealed. Each finish is applied to meet specific application requirements, from hygienic food-grade surfaces to decorative architectural finishes. All products are supplied with mill test certificates (MTC) per EN 10204 3.1, documenting chemical composition and mechanical test results.
Our 321 Pipe/Tube products carry ISO 9001:2015, PED 2014/68/EU, ASME SA240/SA312, NACE MR0175, AD 2000-Merkblatt W2 certifications, providing assurance of material quality and compliance with international standards. We serve customers across Chemical Processing, Food & Beverage, Pharmaceutical, Oil & Gas sectors with consistent product availability and competitive pricing.
Frequently Asked Questions
What is the difference between 304 and 304L stainless steel?
The primary difference is carbon content. 304L has a maximum carbon content of 0.030% compared to 0.07% for 304. This lower carbon content in 304L reduces the risk of carbide precipitation during welding, making it the preferred choice for welded components that operate in corrosive environments. Both grades offer similar corrosion resistance and mechanical properties in the annealed condition.
Is 316 stainless steel worth the extra cost over 304?
316 stainless steel contains 2-3% molybdenum, which significantly improves corrosion resistance, especially against pitting and crevice corrosion in chloride environments. If your application involves marine exposure, chemical processing, or any chloride-containing environment, the additional cost of 316 is well justified. For general indoor or non-aggressive environments, 304 is typically sufficient and more cost-effective.
What is the maximum operating temperature for 310S stainless steel?
310S stainless steel is designed for high-temperature service and can operate continuously at temperatures up to 1150°C (2100°F) in oxidizing atmospheres. Its high chromium (24-26%) and nickel (19-22%) content provides excellent resistance to oxidation and scaling at elevated temperatures, making it ideal for furnace components, heat treatment baskets, and combustion chambers.
What are the advantages of duplex 2205 over austenitic grades?
Duplex 2205 offers approximately twice the yield strength of standard austenitic grades like 304 or 316, allowing for thinner wall sections and weight savings. It also provides superior resistance to stress corrosion cracking and pitting corrosion in chloride environments. The combination of austenitic and ferritic microstructure gives it excellent mechanical properties across a wide temperature range.
Can stainless steel pipes be welded?
Yes, most stainless steel grades are readily weldable using standard welding processes including TIG (GTAW), MIG (GMAW), and resistance welding. Austenitic grades like 304 and 316 are particularly weldable. For standard carbon grades, post-weld annealing may be required to restore corrosion resistance. Low-carbon variants (304L, 316L) are recommended for welded assemblies to avoid sensitization.
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