ASTM A312 TP 316 / 316L STAINLESS STEEL SEAMLESS TUBES

ASTM A312 TP 316/316L stainless steel tubes are a part of the ASTM A312 standard, which delineates specifications for seamless and welded pipes made from stainless steel. These tubes are constructed using stainless steel grades 316 and 316L, alloys widely recognized for their corrosion resistance properties, particularly in challenging and corrosive environments. Stainless steel grade 316 boasts an austenitic structure and consists of key elements like chromium (16-18%), nickel (10-14%), and molybdenum (2-3%).

ASTM A312 TP 316/316L STAINLESS STEEL TUBES

This combination imparts remarkable corrosion resistance, particularly in environments containing chlorides and acids. On the other hand, grade 316L is a modified version with lower carbon content, enhancing its weldability while also minimizing the risk of sensitization and intergranular corrosion. The versatility of ASTM A312 TP 316/316L tubes is exemplified by their diverse applications across various industries.


Their corrosion resistance, combined with good mechanical properties, renders them suitable for deployment in sectors such as chemical processing, petrochemicals, pharmaceuticals, and food and beverage production. Moreover, their adaptability to marine environments, where corrosion can be a major concern, makes them crucial in shipbuilding and offshore structures. In the architectural realm, they are employed for creating decorative elements, facades, and railings.


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Specification:

Specification Description
Standard ASTM A312
Material Grade 316 (UNS S31600) and 316L (UNS S31603)
Manufacturing Method Seamless and Welded
Sizes NPS 1/8" to NPS 30" (Nominal Pipe Size)
Schedule 5S, 10S, 40S, 80S, 10, 20, 30, 40, 60, 80, 100, 120, 140, 160, XXS
Heat Treatment Annealing or Solution Annealing followed by Quenching and Tempering (if required)
Applications Chemical processing, petrochemicals, pharmaceuticals, food and beverage, marine environments, architectural features
Weldability Good, with enhanced weldability in 316L due to lower carbon content
Temperature Range Suitable for high-temperature applications, including heat exchangers and process piping
Handling Follow recommended guidelines for handling, fabrication, and installation
Reference Standard Always refer to the latest version of the ASTM A312 standard for precise and up-to-date information

Chemical Composition of ASTM A312 TP 316/316L STAINLESS STEEL TUBES

Element Grade 316 Composition (%) Grade 316L Composition (%)
Chromium 16.0 - 18.0 16.0 - 18.0
Nickel 10.0 - 14.0 10.0 - 14.0
Molybdenum 2.0 - 3.0 2.0 - 3.0
Carbon 0.08 max 0.03 max
Silicon 1.00 max 1.00 max
Manganese 2.00 max 2.00 max
Phosphorus 0.045 max 0.045 max
Sulfur 0.030 max 0.030 max

Mechanical Properties of ASTM A312 TP 316/316L STAINLESS STEEL TUBES

Mechanical Property Grade 316
Tensile Strength ≥ 515 MPa (≥ 74,700 psi)
Yield Strength (0.2% Offset) ≥ 205 MPa (≥ 29,700 psi)
Elongation ≥ 40%
Hardness (Brinell) ≤ 187 HB
Modulus of Elasticity 200 GPa (29 x 10^6 psi)
Poisson's Ratio 0.30

Advantages of ASTM A312 TP 316/316L STAINLESS STEEL TUBES:

  • Good general corrosion resistance and high strength
  • Good sulfide stress corrosion resistance
  • Resistance to chloride pitting and crevice corrosion
  • Higher resistance to chloride stress corrosion cracking
  • Easy to weld and conform

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Applications Industry

Pharmaceutical Equipment Chemical Equipment
Sea Water Equipment Heat Exchangers
Heat Exchangers Gas Processing
Condensers Specialty Chemicals
Pulp and Paper Industry Pharmaceuticals


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