ASTM A333: LOW-TEMPERATURE CARBON STEEL PIPES
In this article, we give an overview of the A333 pipes specification for low-temperature service: application, chemical composition, mechanical properties.
ASTM A333 PIPES APPLICATION
The ASTM A333 specification covers seamless and welded carbon steel pipes for low-temperature service (down to -150 degrees F). Even if A333 pipes follow the dimensional range of ASME B36.10, specific nominal pipe size/schedule are not manufactured under the A333 specification as heavier wall thicknesses have a negative effect on the impact properties of the pipe at very low temperatures.
THE ASTM A333 SPECIFICATION
This specification covers wall seamless and welded carbon and alloy steel pipe intended for use at low temperatures. The pipe shall be made by the seamless or welding process with the addition of no filler metal in the welding operation. All seamless and welded pipes shall be treated to control their microstructure. Tensile tests, impact tests, hydrostatic tests, and nondestructive electric tests shall be made in accordance to specified requirements. This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.
ASTM A333 PIPES CHEMICAL COMPOSITION (GRADES 1-11)
ASTM A333 pipes are available in multiple grades designated as grade 1, 3, 4, 6, 7, 8, 9, 10, & 11:
|A333 Gr. 1||<=0.30||0.40-1.06||<=0.025||<=0.025|
|A333 Gr. 3||<=0.19||0.18-0.37||0.31-0.64||<=0.025||<=0.025||3.18-3.82|
|A333 Gr. 4||<=0.12||0.18-0.37||0.50-1.05||<=0.025||<=0.025||0.44-1.01||0.47-0.98||0.40-0.75||0.04-0.30|
|A333 Gr. 6||<=0.30||≥0.10||0.29-1.06||<=0.025||<=0.025|
|A333 Gr. 7||<=0.19||0.13-0.32||<=0.90||<=0.025||<=0.025||2.03-2.57|
|A333 Gr. 8||<=0.13||0.13-0.32||<=0.90||<=0.025||<=0.025||8.40-9.60|
|A333 Gr. 9||<=0.20||0.40-1.06||<=0.025||<=0.025||1.60-2.24||0.75-1.25|
|A333 Gr. 10||<=0.20||0.10-0.35||1.15-1.50||<=0.03||<=0.015||<=0.15||<=0.25||<=0.015||<=0.50||<=0.12||<=0.06|
|A333 Gr. 11||<=0.10||<=0.35||<=0.6||<=0.025||<=0.025||<=0.50||35.0-37.0||<=0.50|
ASTM A333 PIPES MECHANICAL PROPERTIES
The table shows the mechanical properties of the three most common ASTM A333 grades, i.e. ASTM A333 Gr.1, ASTM A333 Gr.3 and, ASTM A333 Gr. 6:
ASTM A333 PIPES TEST REQUIREMENTS
A333 pipes are supplied in normalized conditions and the Charpy impact test is always executed at specific temperatures to ensure the compliance of the products to the temperature range set by the standard. The minimum impact test temperatures by grade are shown in the table below:
|A333 Material Grade||F||C|
The mechanical testing on A333 pipes shall be executed as follows:
- transverse/longitudinal tension/flattening/hardness/bend: tests to be made on 5% of the pipe from each treated lot. For smaller lots, at least one pipe has to be tested. For material heat treated by the continuous process, tests shall be made on a sufficient number of pipe to constitute 5% of the lot, but in no case less than 2 pipes.
- Hydrostatic/ impact/one notched bar impact: shall be made from each heat represented in a heat-treatment load on specimens taken from the finished pipe.
MANUFACTURERS OF ASTM A333 PIPES
|Jiangu Chengde Steel Tube||China|
|Mittal Steel||Czech Republic / Romania|
|NKK / Tenaris||Japan|