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The specification for carbon steel pipes intended for use in low-temperature applications is ASTM A333 Grade 6. These pipes are mostly used in industries where low-temperature toughness and resistance to brittle fracture are essential. Since the operating temperatures in these sectors can drop dramatically, they are widely utilized in the petrochemical, power generating, and cryogenic industries. The specifications for carbon steel pipes that are welded or seamless and meant to be used in low-temperature applications are specified in the ASTM A333 standard. Even at -50°F (-45°C), grade 6 pipes are renowned for their exceptional impact toughness. This quality is essential for preserving structural integrity and averting collapse in situations where extremely low temperatures are present.
A maximum carbon percentage of 0.30%, a manganese level ranging from 0.60% to 0.90%, and trace amounts of silicon, phosphorus, and sulfur are among the chemical components of ASTM A333 Grade 6 steel. A minimum tensile strength of 60 ksi (415 MPa) and a minimum yield strength of 35 ksi (240 MPa) are among the particular mechanical qualities. To make sure the pipes are resistant enough at the right temperatures, they must also be put through an impact test.
Heat treatment, such as normalizing or annealing, is used during the manufacturing process of ASTM A333 pipes to alleviate tensions and obtain the required mechanical qualities. To meet the demands of diverse applications, the pipes are often manufactured in a range of diameters and wall thicknesses.
Pipe Specification : ASTM A333 / ASME SA333
Size : 1/4” NB to 30” NB
Schedule : SCH 10, SCH20, SCH30, SCH40, STD, SCH60, XS, SCH80, SCH120, SCH140, SCH160, XXS
Type : Seamless / ERW / Welded / Fabricated / EFW
Form : Round Pipes, Square Pipes, Rectangular Pipe
Length : Single Random, Double Random & Cut Length
End : Plain End, Beveled End, Threaded
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ASTM A333 Gr. 6 Low Temperature Carbon Steel Round Pipe
Chemical composition % | |||||||||
Grade | 1 | 3 | 4 | 6 | 7 | 8 | 9 | 10 | 11 |
C,max | 0.3 | 0.19 | 0.12 | 0.3 | 0.19 | 0.13 | 0.2 | 0.2 | 0.1 |
Mn | 0.40-1.06 | 0.31-0.64 | 0.5-1.05 | 0.29-1.06 | 0.9,max | 0.9,max | 0.4-1.06 | 1.15-1.5 | 0.6,max |
P,max | 0.025 | 0.025 | 0.025 | 0.025 | 0.025 | 0.025 | 0.025 | 0.035 | 0.025 |
S,max | 0.025 | 0.025 | 0.025 | 0.025 | 0.025 | 0.025 | 0.025 | 0.025 | 0.025 |
Si | – | 0.18-0.37 | 0.08-0.37 | 0.1,min | 0.13-0.32 | 0.13-0.32 | … | 0.1-0.35 | 0.35,max |
Ni | – | 3.18-3.82 | 0.47-0.98 | – | 2.03-2.57 | 8.4-9.6 | 1.6-2.24 | 0.25,max | 35-37 |
Cr | – | – | 0.44-1.01 | – | – | – | – | 0.15,max | 0.5,max |
Cu | – | – | 0.4-0.75 | – | – | – | 0.75-1.25 | 0.15,max | – |
Al | – | – | 0.04-0.3 | – | – | – | – | 0.06,max | – |
V,max | – | – | – | – | – | – | – | 0.12 | – |
Nb,max | – | – | – | – | – | – | – | 0.05 | – |
Mo,max | – | – | – | – | – | – | – | 0.05 | 0.5,max |
Co | – | – | – | – | – | – | – | – | 0.5,max |
Mn | 0.40-1.06 | 0.31-0.64 | 0.5-1.05 | 0.29-1.06 | 0.9,max | 0.9,max | 0.4-1.06 | 1.15-1.5 | 0.6,max |
Mechanical properties | |||||||||
GRADE | 1 | 3 | 4 | 6 | 7 | 8 | 9 | 10 | 11 |
Tensile strength, min,Mpa | 380 | 450 | 415 | 415 | 450 | 690 | 435 | 550 | 450 |
Yield strength, min,Mpa | 205 | 240 | 240 | 240 | 240 | 515 | 315 | 450 | 240 |
Elongation,min, (s≥8mm) | 35% | 30% | 30% | 30% | 30% | 22% | 28% | 22% | 18% |
Elongation, min, (Standard circle) | 28% | 22% | 22% | 22% | 22% | 16% | – | 16% | – |
Elongation(s<8mm) Percentage reduction from basic each reduction of 8mm of wall thickness | 1.75 | 1.5 | 1.5 | 1.5 | 1.5 | 1.25 | 1.5 | 1.25 | – |
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