One of the main attractions of using Low Temperature Carbon Steel Pipes is their use at very low temperature settings. LTCS or as many manufacturers refer to them asA333 Gr 3 Low Temperature Carbon Steel Pipes features properties like moderate strength with toughness down to a temperature as low as — 50°F. Generally, these pipes are well suited to those applications where refrigerants are used during transportation of media.
These properties in combination with its low alloying costs makes the LTCS ASTM A333 Gr 3 Pipe a well-favoured product in transportation industries. In addition to a high content of carbon, these alloys have a high amount of manganese along with trace amounts of sulfur and phosphorus. The fine grain microstructure present in the alloy of ASTM A333 Grade 3 Low Temperature Pipe presents a uniform dispersion of carbides. A specification which covers Low Temperature Carbon Steel Pipes is ASTM A333. Both the seamless and welded variety enveloped in this specification are intended for application at low temperatures. Keeping in accordance with this specification neither the seamless nor the welded pipes that undergo welding operations would contain the addition of a filler metal. Both the A333 Grade 3 Seamless Pipe and welded pipe are required to be treated to regulate their microstructure. impact tests, Tensile tests, hydrostatic tests, as well as nondestructive electric tests are performed on the ASTM A333 Grade 3 Pipe in accordance with detailed obligations.
Specifications | ASTM A 333, ASME SA 333 |
Size Range | 1/2” NB to 36” NB |
Outer Dimensions | 19.05mm-114.3mm |
Wall Thickness | 2.0mm-14 mm |
Type | Seamless / Welded |
Schedules | SCH 40, SCH 80, SCH 160, SCH XS, SCH XXS, All Schedules |
Length | max 16000mm |
Grade | Grade 3 |
Composition, % | |||
Element | Grade 1 | Grade 3 | Grade 6 |
Carbon, max | 0.30 | 0.19 | 0.30 |
Manganese | 0.40 – 1.06 | 0.31 – 0.64 | 0.29 – 1.06 |
Phosphorous, max | 0.025 | 0.025 | 0.025 |
Sulfur, max | 0.025 | 0.025 | 0.025 |
Silicon | 0.18 -0.37 | 0.10 min | |
Nickel | 3.18 – 3.82 |
Grade | Yield Strength (Mpa) | Tensile Strength (Mpa) | Elongation (%) |
Grade.3 | ≥450 | ≥240 | 30% |
Grade 1 | Grade 3 | Grade 6 | |||||
psi | MPa | psi | MPa | psi | MPa | ||
Tensile Strength, min | 55,000 | 380 | 65,000 | 450 | 60,000 | 415 | |
Yield Strength, min | 30,000 | 205 | 35,000 | 240 | 35,000 | 240 | |
Longitudinal | Transverse | Longitudinal | Transverse | Longitudinal | Transverse | ||
Elongation in 2 in. or 50 mm, (or 4D), min, %: | |||||||
Basic minimum elongation for walls 5/16 in. [8 mm] and over in thickness, strip tests, and for all small sizes tested in full section | 35 | 25 | 30 | 20 | 30 | 16.5 | |
When the standard round 2-in. or 50-mm gage length or proportionally smaller size test specimen with the gage length equal to 4D (4 times the diameter) is used | 28 | 20 | 22 | 14 | 22 | 12 | |
For strip tests, a deduction for each 1/32in. [0.8 mm] decrease in wall thickness below 5/16 in. [8 mm] from the basic minimum elongation of the following percentage | 1.75 | 1.25 | 1.50 | 1.00 | 1.50 | 1.00 | |
Elongation in 2 in. or 50 mm, min, %: |
Grade | The lowest temperature for strike test | ||||||||
℉ | ℃ | ||||||||
ASTM A333 Gr.3 | -150 | -100 |
Wall Thickness | Grade 1 | Grade 3 | Grade 6 | ||||
in. | mm | Longitudinal | Transverse | Longitudinal | Transverse | Longitudinal | Transverse |
5/16 (0.312) | 8 | 35 | 25 | 30 | 20 | 30 | 16 |
9/32 (.281) | 7.2 | 33 | 24 | 28 | 19 | 28 | 15 |
1/4 (.250) | 6.4 | 32 | 23 | 27 | 18 | 27 | 15 |
7/32 (.219) | 5.6 | 30 | 26 | 26 | |||
3/16 (.188) | 4.8 | 28 | 24 | 24 | |||
5/32 (.156) | 4 | 26 | 22 | 22 | |||
1/8 (.125) | 3.2 | 25 | 21 | 21 | |||
3/32 (.094) | 2.4 | 23 | 20 | 20 | |||
1/16 (.063) | 1.6 | 21 | 18 | 18 |
Size of Specimen, min | Minimum Average Notched Bar Impact Value of Each Set of Three Specimens | Minimum Notched Bar Impact Value of One Specimen Only of a Set | Impact Temperature | |||||
ft-lbf | J | ft-lbf | J | Grade | Min Impact Test Temp |
|||
10 by 10 | 13 | 18 | 10 | 14 | F | C | ||
10 by 7.5 | 10 | 14 | 8 | 11 | 1 | -50 | -45 | |
10 by 6.67 | 9 | 12 | 7 | 9 | 3 | -150 | -100 | |
10 by 5 | 7 | 9 | 5 | 7 | 6 | -50 | -45 | |
10 by 3.33 | 5 | 7 | 3 | 4 | ||||
10 by 2.5 | 4 | 5 | 3 | 4 |