SS 310 & 310S Seamless Tubes Supplier
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Midland Alloys Inc. is a trusted manufacturer and supplier of SS 310 and 310S seamless tubes, engineered with advanced metallurgical control for demanding high-temperature environments. Our stainless steel 310 seamless tubes are widely used in heat-intensive and oxidation-resistant applications such as furnaces, heat exchangers, petrochemical processing, and thermal systems. Manufactured in compliance with ASTM, ASME, and EN standards, these high-alloy seamless tubes deliver consistent mechanical strength, corrosion resistance, and long service life. We offer a wide range of OD sizes, wall thickness options, and heat-resistant surface finishes to meet precise industrial and project-specific requirements. The SS 310S low-carbon grade provides enhanced stability at elevated temperatures, minimizing carbide precipitation during prolonged service. With robust quality certifications, reliable logistics, and strong export readiness, Midland Alloys Inc. ensures dependable supply and technical assurance across global markets.
What is SS 310 and 310S Seamless Tubing?
SS 310 and 310S seamless tubing refers to high-alloy, chromium–nickel austenitic stainless steel tubes developed for sustained high-temperature service. These tubes are manufactured without welded joints, eliminating structural weak points and ensuring superior performance under extreme heat and pressure conditions. In simplified industrial terms, a solid stainless steel billet is pierced and hot-worked into a tube, allowing uniform grain flow, consistent wall thickness, and enhanced mechanical integrity.
Both grades offer excellent resistance to oxidation, scaling, and corrosion, supported by high chromium and nickel content that maintains metallurgical stability at elevated temperatures. SS 310 performs reliably in continuous service environments reaching up to 1150°C, making it suitable for severe thermal applications. SS 310S, the low-carbon variant, minimises carbide precipitation during prolonged heating cycles, improving structural stability and weld performance. As a result, SS 310 and 310S seamless tubing is widely used in furnaces, heat exchangers, petrochemical systems, and other high-temperature industrial installations requiring long-term operational reliability.
Benefits of Seamless SS 310 & 310S Tubes
Selecting a stainless steel 310 seamless tube ensures your infrastructure remains intact despite heavy thermal loads and aggressive gas environments. The seamless architecture provides a level of structural integrity that welded tubes cannot match in high-pressure scenarios.
- High-temperature strength is maintained by a uniform, joint-free tube structure
- Strong oxidation and scaling resistance under elevated operating temperatures
- Reliable behaviour during repeated heating and cooling cycles
- Lower failure risk compared to welded high-alloy tube alternatives
- Stable mechanical properties during continuous furnace exposure
- Longer service life in heat zones and radiant sections
- Consistent wall thickness supporting pressure and thermal loads
- Documented SS 310 seamless tube advantages in thermal systems using SS 310S high-temperature tubing
Specification of Stainless Steel 310/310S Seamless Tube
The following specification table includes the most common dimensions ranges, tolerances, standards, and delivery conditions for SS 310, and 310S seamless tubes, each tubes are design in accordance with international high-temperature service requirements.
Seamless Tube OD : 1/8 -12" NPS
ASTM A213, A269, A249, A511, A554 / ASME SA213, SA269, SA249, SA511, SA554
Seamless
Round, Square, Rectangular, Hydraulic Etc
Single Random, Double Random, Standard & Cut length
Plain Ends (PE), Threaded Ends (TE), Bevelled Ends (BW), Grooved Mechanical Joints or Grooved Ends, TBE (Treaded Both Ends)
SCH 5, SCH10, SCH 40, SCH 80, SCH 80S, SCH 160, SCH XXS, SCH XS
2B, No.4, No.1, No.8 Mirror Finish for Stainless Steel Tubes, Finish as per customer Requirements
Types of SS 310 / 310S Seamless Tubes
Our manufacturing processes offer various types of joint-free tubes that meet specific mechanical requirements in heat-intensive zones. We provide these in a variety of dimensional forms, and grades to accommodate a wide range of industrial designs.
Pipe Forms
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Round TubeIdeal for transporting high-temperature gases and fluids through complex piping systems.
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Square TubeFrequently used to build thermal frames and structural supports inside industrial kilns.
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Rectangular TubeProvides high structural rigidity for load-bearing assemblies exposed to radiant heat.
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Boiler TubeSpecifically engineered to handle high-pressure steam in power generation and heating plants.
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Heat Treatment TubeHeavily used as protective sleeves and muffle tubes within specialised furnaces.
Contact us today to discuss how Stainless Steel 310/310S Seamless Tubes can benefit your application. Whether you need guidance in selecting the right Tubes or have specific requirements, our team of experts is here to help you find the optimal solution.
Technical Details & Delivery Condition
This table presents the controlled chemical composition limits for SS 310 and SS 310S seamless tubing, highlighting chromium, nickel, and carbon ranges as defined by applicable ASTM and EN standards.
| Grade | C | Mn | Si | P | S | Cr | Ni |
| SS 310 | 0.015 max | 2 max | 0.15 max | 0.020 max | 0.015 max | 24 – 26 | 19 – 21 |
| SS 310S | 0.08 max | 2 max | 1.0 max | 0.045 max | 0.030 max | 24 – 26 | 19 – 21 |
| Grade | Tensile Strength (MPa) min | Yield Strength 0.2% Proof (MPa) min | Elongation (% in 50mm) min | Hardness | |
| Rockwell B (HR B) max | Brinell (HB) max | ||||
| 310 | 515 | 205 | 40 | 95 | 217 |
| 310S | 515 | 205 | 40 | 95 | 217 |
Stainless Steel Tubes Grades We Offer
Manufacturing Process of 310/310S Stainless Steel Seamless Tubes
Round Bar
Analytic
Cut to Length
Centering
Heating
Perforation
Inspection of Size
Pickling
Inspection of Surface
Lubricating
Cold Drawing (Cold Rolling)
Degreasing
Annealing
Straightening
Cut
Pickling / Passivating
Inspection
Analytic
Marking
Packing & Shipping
Industrial Applications of SS 310 & 310S Seamless Tube
SS 310 and 310S seamless tubes are used in furnaces, petrochemical units, power plants, refineries, and thermal processing facilities. Engineers require these in heat exchangers, boilers, radiant tubes, and kiln systems where oxidation resistance and dimensional stability are critical. Even when exposed to cyclic thermal loads, performance remains consistent in oxidising, high-heat conditions. These tubes are preferred by procurement teams in continuous-process manufacturing plants, and other places where downtime is more expensive than material selection.
Why Choose SS 310 / 310S Seamless Tube
Midland Alloys Inc. is an ISO authorized manufacturer of SS 310 / 310S seamless tubes designed for applications where high temperatures and material durability remain constant concerns. The seamless construction maintains structural integrity under repeated expansion and contraction, reducing the risk of localised failure in high-heat zones. Even in harsh furnace environments, a high chromium and nickel concentration offers strong resistance to oxidation, and carburization. Without losing its dimensional stability, these tubes can withstand prolonged exposure to high temperatures. As it contains less carbon, the 310S grade provides better stability over extended heat usage by preventing the production of carbides. Midland Alloys Inc. is a heat-resistant seamless tube supplier that provides export-quality stainless steel tubes for crucial industrial systems through controlled production and verified compliance.
FAQs
SS 310 seamless tubes combine high chromium, and nickel content with a joint-free structure. These tubes are allowed to withstand oxidation and retain their strength at high temperatures.
The primary difference is the carbon content. SS 310S contains lower carbon, which limits carbide precipitation and improves stability during prolonged high-temperature exposure.
Yes. SS 310S seamless tubes can withstand prolonged heat exposure, as the alloy retains mechanical strength, and resists oxidation during extended operation cycles. The low-carbon composition prevents scaling, and structural damage, even when the tubes are heated at high temperatures for a long period of time.
SS 310 seamless tubes are commonly used in furnace parts, heat treatment baskets, and chemical processing equipment. You also see them in food processing and ore smelting, where heat and corrosion are both present.
