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ASTM A333 / SA333 Gr 3

ASTM A333 / SA333 Gr 3

SpecificationDetails
StandardASTM A333 / ASME SA333
GradeGrade 3
Product TypeSeamless / Welded Low Temperature Carbon Steel Pipe
Nominal Pipe Size (NPS)1/2" to 36" NB
Outer Diameter (OD)Standard ODs from 0.840" to 36" (19.05 mm to 914.4 mm)
Wall ThicknessStandard wall thicknesses vary with pipe schedules; 2.0 mm up to 14 mm or more
Available LengthsSingle random: 17'–24'
Double random: 36'–44'
Custom lengths: up to 18 meters (≈60 feet)
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 3 Low Temperature Carbon Steel Pipe

ASTM A333 / SA333 Gr 3 is a low-temperature carbon steel pipe designed to perform reliably in sub-zero environments. It belongs to the ASTM A333 / ASME SA333 specification covering seamless and welded pipes suitable for cryogenic and low-temperature applications. Grade 3 offers higher tensile strength than Grade 1 while maintaining excellent impact resistance.

Key Features

  • Designed for low-temperature service
  • Superior impact toughness at sub-zero temperatures
  • Good weldability and formability
  • Available in seamless and welded types
  • Ideal for cryogenic, oil & gas, and chemical processing applications

Sizes

Nominal Pipe Size (NPS)  Outside Diameter (OD) Schedule (SCH) Wall Thickness [in] Wall Thickness [mm]
1/2″ 0.840 in 40 (STD) 0.109 2.77
0.840 in 80 (XS) 0.147 3.73
1″ 1.315 in 40 (STD) 0.133 3.38
1.315 in 80 (XS) 0.179 4.55
2″ 2.375 in 40 (STD) 0.154 3.91
2.375 in 80 (XS) 0.218 5.54
4″ 4.500 in 40 (STD) 0.237 6.02
4.500 in 80 (XS) 0.337 8.56
6″ 6.625 in 40 (STD) 0.280 7.11
6.625 in 80 (XS) 0.432 10.97
8″ 8.625 in 40 (STD) 0.322 8.18
8.625 in 80 (XS) 0.500 12.70
12″ 12.750 in 40 (STD) 0.375 9.53
12.750 in 80 (XS) 0.500 12.70

ASTM A333 / SA333 Gr 3 Chemical Composition

Element Percentage (%)
Carbon (C) 0.30 max
Manganese (Mn) 0.40–1.06
Phosphorus (P) 0.025 max
Sulfur (S) 0.025 max
Silicon (Si) 0.10 min
Nickel (Ni) 1.25–1.75

ASTM A333 / SA333 Gr 3 Mechanical Properties

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

Heat Treatment

  • Normalized, Normalized & Tempered, or Quenched & Tempered depending on application.

Applications

  • Cryogenic pipelines and storage systems
  • Oil & Gas pipelines
  • LNG transport and storage
  • Chemical plants and refineries
  • Power generation equipment

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