ASTM A333/A333M Standard Specification for Seamless and Welded Steel Pipe for Low-Temperature Service and Other Applications with Required Notch Toughness.Download PDF
ASTM A333/A333M 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.
Several grades of ferritic steel are included. Some product sizes may not be available under this specification because heavier wall thicknesses have an adverse affect on low-temperature impact properties. 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.
ASTM A333 alloy 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. Some product sizes may not be available under this specification because heavier wall thicknesses have an adverse affect on low-temperature impact properties.
ASTM A333 steel pipe production includes a series of visual surface imperfections to guarantee that they have been properly manufactured. ASTM A333 steel pipe shall be subject to rejection if surface imperfections acceptable are not scattered, but appear over a large area in excess of what is considered a workmanlike finish. The finished pipe shall be reasonably straight.
Surface imperfections that penetrate more than 12½ % of the nominal wall thickness or encroach on the minimum wall thickness shall be considered defects. ASTM A333 steel pipe with such defects shall be given one of the following dispositions:
ASTM A333 Grade 6 pipe is a low-temperature carbon steel pipe that is typically used in applications where the pipe will be exposed to temperatures below -45°C. Because of its superior notch toughness, it performs well in cryogenic conditions and has demonstrated durability at temperatures as low as -452°F. This makes it the perfect candidate for applications where the pipe will be subject to cold temperatures throughout construction and/or operation.
A333 Seamless Pipe (ASME S/A-333) comes in nominal pipe sizes 1/4″ to 24″ O.D.
Pipe dimensions range from 1/2″ to 24″ O.D. for A333 welded pipes (ASME S/A-333).
Carbon and alloy steel pipe with a nominal (average) wall thickness intended for low temperature operation is covered by ASTM A333. There are several ferritic steel grades included in this standard. A106 GR. B Carbon Steel Seamless Pipes Some product sizes may not be available under this specification because heavier wall thicknesses harm low-temperature impact properties.
The difference between ASTM A333 and ASTM A106 is that ASTM A333 is a low-temperature carbon steel pipe that can be used as a structural pipe, while ASTM A106 is a non-structural carbon pipe that is used in high-temperature applications.
The ASTM A106 Gr.B carbon steel Pipe is valued for its high tensile strength and toughness, high oxidation resistance, and prolonged durability. Additionally, the Seamless Pressure ASTM A106 Pipe has wide applications in industries such as the gas and oil industry, water, heating, pipeline construction, and many others.
However, the ASTM A106 Gr.B carbon steel Pipe should be used only at temperatures less than 430°C, as exceeding this temperature can result in a reduction in its mechanical properties. The pipe is therefore not suitable for very high-temperature services.
|Grade||Tensile Strength (MPa）||Yield Point (MPa)||Elongation (%)|
|ASTM A333 Grade 1||≥380||≥205||≥35||≥25|
|ASTM A333 Grade 3||≥450||≥240||≥30||≥20|
|ASTM A333 Grade 4||≥415||≥240||≥30||≥16.5|
|ASTM A333 Grade 6||≥415||≥240||≥30||≥16.5|
|ASTM A333 Grade 7||≥450||≥240||≥30||≥22|
|ASTM A333 Gr. 8||≥690||≥515||≥22|
|ASTM A333 Grade 9||≥435||≥315||≥28|
|ASTM A333 Grade 10||≥550||≥450||≥22|
|ASTM A333 Grade 11||≥450||≥240||≥18|
*The elongation values are furnished on the basis of standard round 2 inch or 50 mm(or 4D) specimens.
*Elongation of Grade 11 is for all walls and small sizes tested in full section.
|Grade||Chemical Composition (%)|
*For Grade 1 and 6, each reduction of 0.01% C below 0.30%, an increase of 0.05 % Mn above 1.06 % would be permitted to a max. of 1.35%.
*For Grade 6, the limit for columbium may be increased up to 0.05 % on heat analysis and 0.06 % on product analysis.
*Generally, the carbon equivalent C.E = [C + Mn/6 + (Cr + Mo + V)/5 + (Ni + Cu)/15] shall not exceed 0.43% by heat analysis.
|No.||Order No.||Size description|
|O.D. /mm||W.T. /mm||Legnth /m|
|1||A333 Gr.6 A333 Gr.6/X42NS||10-127||1-20||6-12.0|
|Crade||The lowest temperature for strike test|
|ASTM A333 Grade 1||-50||-45|
|ASTM A333 Grade 3||-150||-100|
|ASTM A333 Grade 4||-150||-100|
|ASTM A333 Grade 6||-50||-45|
|ASTM A333 Grade 7||-100||-75|
|ASTM A333 Grade 8||-320||-195|
|ASTM A333 Grade 9||-100||-75|
|ASTM A333 Grade 10||-75||-60|
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Alloy steels are made by combining carbon steel with one or several alloying elements, such as manganese, silicon, nickel, titanium, copper, chromium and aluminum. These metals are added to produce specific properties that are not found in regular carbon steel. The elements are added in varying proportions (or combinations) making the material take on different aspects such as increased hardness, increased corrosion resistance, increased strength, improved formability (ductility); the weldability can also change.
Commonly used alloying elements and their effects are listed in the table given below.
|Alloying Elements||Effect on the Properties|
|Chromium||Increases Resistance to corrosion and oxidation. Increases hardenability and wear resistance. Increases high temperature strength.|
|Nickel||Increases hardenability. Improves toughness. Increases impact strength at low temperatures.|
|Molybdenum||Increases hardenability, high temperature hardness, and wear resistance. Enhances the effects of other alloying elements. Eliminate temper brittleness in steels. Increases high temperature strength.|
|Manganese||Increases hardenability. Combines with sulfur to reduce its adverse effects.|
|Vanadium||Increases hardenability, high temperature hardness, and wear resistance. Improves fatigue resistance.|
|Titanium||Strongest carbide former. Added to stainless steel to prevent precipitation of chromium carbide.|
|Silicon||Removes oxygen in steel making. Improves toughness. Increases hardness ability|
|Boron||Increases hardenability. Produces fine grain size.|
|Aluminum||Forms nitride in nitriding steels. Produces fine grain size in casting. Removes oxygen in steel melting.|
|Cobalt||Increases heat and wear resistance.|
|Tungsten||Increases hardness at elevated temperatures. Refines grain size.|