ASTM A 333 – Seamless and Welded Steel Pipe for Low-Temperature Service

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

Ordering Information

Orders for material under this specification should include the following, as required, to describe the material adequately:

1. Quantity (feet, centimetres, or number of lengths)，
2. Name of material (seamless or welded pipe),
3. Grade,
4. Size (NPS or outside diameter and schedule number of average wall thickness),
5. Lengths (specific or random),
6. End finish,
7. Optional requirements,
8. Test report required,
9. Specification designation, and
10. Special requirements or exceptions to this specification.

Grade: 3

Chemical Requirements(Composition, %)

C: ≤0.19

Mn: 0.31-0.64

P: ≤0.025

S: ≤0.025

Si: 0.18-0.37

Ni: 3.18-3.82

Heat Treatment

1. Normalize by heating to a uniform temperature of not less than 815 °C and cool in air or in the cooling chamber of an atmosphere controlled furnace.
2. Normalize as in 1, and, at the discretion of the manufacturer, reheat to a suitable tempering temperature.
3. For the seamless process only, reheat and control hot working and the temperature of the hot-finishing operation to a finishing temperature range from 845 to 945°C  and cool in air or in a controlled atmosphere furnace from an initial temperature of not less than 845 °C.
4. Treat as in 3 and, at the discretion of the manufacturer, reheat to a suitable tempering temperature.
6. For the seamless pipes only, heat to a uniform temperature of not less than 815 °C, followed by quenching in liquid and reheating to a suitable tempering temperature, in place of any of the other heat treatments provided above.

Tensile Requirements

Tensile strength: ≥450Mpa

Yield strength: ≥240Mpa

Elongation

Charpy V-notch Impact Tests

Impact Temperature: -100°C。

When subsize Charpy impact specimens are used and the width along the notch is less than 80 % of the actual wall thickness of the original material, the specified Charpy impact test temperature shall be lower.

Hydrostatic or Nondestructive Electric Test

Each 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.

Permissible Variations in Outside Diameter

Permissible Variations in Wall Thickness

The minimum wall thickness at any point shall not be more than 12.5 % under the nominal wall thickness specified.