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ASTM A333 Gr.1, Gr.6, Gr.8 Seamless Low-Temperature Pipes

ASTM A333 / A333M, ASME SA333 / SA333M Gr.6 is the standard applicable to

seamless and welded steel pipe for low-temperature Service

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ASTM A333/A 333M covers nominal (average) wall seamless and welded carbon and alloy steel pipe intended for use at low temperatures.


ASTM A333/A 333M covers several grades of carbon and alloy steel seamless and welded pipes included Grade1, Grade3, Grade4, Grade6, Grade7, Grade8, Grade9, Grade10, Grade11.

ASTM A333/A 333M pipe shall be made by the seamless or welding process with the addition of no filler metal in the welding operation. Grade 4 shall be made by the seamless process.

Click to download the details of ASTM A333 GR.6, GR8 Low Temperature Pipes

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Standard: ASTM A333/A 333M; ASME SA333

Description Name: ASTM A333 GR.6 Seamless pipes, A333 GR.6 tubes, A333 GR.8 Seamless pipes, A333 GR.6 low temperature pipes.

Size: 21.3mm-406mm

Schedule: 2mm-60mm

Shape: Round sections.

Length: Single random length/ Double random length or as customer’s actual request

Grade: Gr.1; Gr.6; Gr.8

Condition: The purchaser shall specify a sizing method and, if required, a thermal treatment.

  • Sizing Methods:

HF-Hot Finished,

CW-Cold worked,

ASTM A333/A 333M Chemical Composition (%):

A333/A 333MChemical Components (%)

ASTM A333/A 333M Tensile Requirements

A333/A 333MGrade 1Grade 6Grade 8
Tensile strength, min5500038060000415100000690
Yield strength, min300002053500024075000515
Elongation, min35253016.522

Impact requirements for Gr.1, Gr.6

ASTM A333/A333M Gr.1, Gr.6, Gr.8 Impact requirements
Size of Specimen, mmMinimum Average Notched
Bar Impact Value of
Each Set of Three
Specimens A
Minimum Notched Bar
Impact Value of One
Specimen Only of
a Set A
10 by 1013181014
10 by 7.51014811
10 by 6.6791279
10 by 57957
10 by 3.335734
10 by 2.54534
A Straight-line interpolation for intermediate values is permitted.

Impact Temperature

GradeMinimum Impact Test Temperature
1 −50−45
8 −320 −195

Impact Temperature Reduction

Specimen Width Along Notch or Actual Material ThicknessTemperature Reduction,
Degrees Colder A °F°C
0.39410 (Standard size)00
0.2957.5 (3/4 std. size)53
0.2626.67 (2/3 std. size)105
0.1975 (1/2 std. size)42011
0.1313.33 (1/3 std. size)3519
0.0992.5 (1/4 std. size)5028

Hydrostatic or Nondestructive Electric Test

  • ASTM A333 GR.1, GR.6, GR.8 pipe shall be subjected to the nondestructive electric test or the hydrostatic test. The type of test to be used shall be at the option of the manufacturer, unless otherwise specified in the purchase order.
  • The hydrostatic test shall be in accordance with Specification A 999/A 999M
  • Nondestructive Electric Test—Nondestructive electric tests shall be in accordance with Specification A 999/A 999M

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Product Marking

  • ASTM A333 tubes marking shall include whether hot finished, cold drawn, seamless or welded, the schedule number and the letters “LT” followed by the temperature at which the impact tests were made, except when a lower test temperature is required because of reduced specimen size, in which case, the higher impact test temperature applicable to a full-size specimen should be marked.
  • When the size of the finished pipe is insufficient to obtain sub size impact specimens, the marking shall not include the letters “LT” followed by an indicated test temperature unless Supplementary Requirement S1 is specified.
  • When the pipe is furnished in the quenched and tempered condition, the marking shall include the letters “QT,” and the heat treatment condition shall be reported to the purchaser or his representative.

ASTM A333 GR.6 Tubes and Pipes 

ASTM A333 GR.6 Pipes Inspection by SGS People.

ASTM A333 GR.6 Pipes Inspection

ASTM A333 GR.6 Pipes Third Party Inspection By SGS people.

ASTM A333 GR.6 Pipes Third Party Inspection

Packing and Marking

  • Packed in bundles, wrapped in plastic, and suitably protected for sea-worthily delivery or as requested.

ASTM A333 GR.6 Pipes Packaged in bundles with plastic caps protected.

ASTM A333 GR.6 Pipes Packaged

ASTM A333 Grade 6 Pipes Marking

ASTM A333 Grade 6 Pipes Marking

Standard and Product List

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