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ASTM A333 / SA333 Gr 7

ASTM A333 / SA333 Gr 7

SpecificationDetails
StandardASTM A333 / ASME SA333
GradeGrade 7
Product TypeSeamless / Welded Low Temperature Carbon Steel Pipe
Outer Diameter (OD) / NPSOD range: 1/8" to 36"
Nominal Bore (NB): 1/4" NB to 30" NB
Welded pipe: 1/2" to 24"
Seamless tubes: 3/4" to 20"
Metric ODs: 19.05 mm to 114.3 mm
Wall ThicknessAvailable in full pipe schedules: SCH 10, SCH 20, SCH STD, SCH 40, SCH 80, SCH 160, STD, XS, XXS
Metric thickness: 2.0 mm to 14 mm (heavier on request)
Available LengthsSingle random: 17’–24’
Double random: 36’–44’
Custom/fixed lengths available
Heat TreatmentNormalized, Normalized & Tempered, or Quenched & Tempered
Pipe EndsPlain End (PE), Beveled End (BE), Threaded End (TE)
Surface FinishBlack Painted, Varnished, Anti-Rust Oil Coated, Galvanized, or as required
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ASTM A333 / SA333 Gr 7  Seamless and Welded Carbon Steel Pipes 

ASTM A333 / SA333 Gr 7 covers seamless and welded carbon steel pipes intended for low-temperature service. This grade provides reliable toughness and strength in sub-zero conditions, making it suitable for cryogenic systems, LNG transport, and applications requiring excellent notch toughness. Grade 7 is alloyed with a small amount of nickel to enhance low-temperature impact resistance.

Key Features

  • Designed for low-temperature service
  • Alloyed with nickel for better toughness
  • Excellent weldability and machinability
  • Available in seamless and welded forms
  • Ideal for cryogenic and LNG applications

ASTM A333 / SA333 Gr 7 Chemical Composition

Element Composition (%)
Carbon (C) 0.19 max
Manganese (Mn) 0.90 max
Phosphorus (P) 0.025 max
Sulfur (S) 0.025 max
Silicon (Si) 0.13 – 0.32
Nickel (Ni) 0.40 – 1.06

ASTM A333 / SA333 Gr 7 Mechanical Properties

Property Requirement
Tensile Strength (MPa) 415 min
Yield Strength (MPa) 240 min
Elongation (%) 30 min
Impact Test (–45°C) Required (Charpy V-Notch)

Heat Treatment

  • Normalized
  • Normalized & Tempered
  • Quenched & Tempered (if required by specification)

Applications

  • LNG pipelines and cryogenic storage
  • Petrochemical and chemical plants
  • Oil & Gas transmission pipelines
  • Power plants and refineries
  • Shipbuilding and offshore platforms

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