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ASTM A333 covers nominal (average) wall seamless and welded carbon and alloy steel pipe intended for use at low temperatures. 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.
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ASTM A333 Grade 6 Carbon Steel Seamless Pipes are Medium Carbon Steel Pipes with max 0.30 % carbon content with combination of 0.29 – 1.06 % manganese. These Pipes are most commonly used for general purpose applications worldwide. ASTM A333 Grade 6 Pipes are ductile and strong Pipes with long wearing properties. These Pipes are manufactured as per ASME Specification and commercially referred as carbon steel Pipes.
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A333 Gr.3 contains a lower amount of carbon, with a maximum carbon content of 0.19%.
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Composition, % |
|
|
Element |
Grade 3 |
Grade 6 |
|
Carbon, max |
0.19 |
0.30 |
|
Manganese |
0.31 – 0.64 |
0.29 – 1.06 |
|
Phosphorous, max |
0.025 |
0.025 |
|
Sulfur, max |
0.025 |
0.025 |
|
Silicon |
0.18 -0.37 |
0.10 min |
|
Nickel |
3.18 – 3.82 |
 |
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Grade 3 |
Grade 6 |
||
|
psi |
MPa |
psi |
MPa |
|
|
Tensile Strength, min |
65,000 |
450 |
60,000 |
415 |
|
Yield Strength, min |
35,000 |
240 |
35,000 |
240 |
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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 |
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 |
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 |
1.50 |
1.00 |
1.50 |
1.00 |
|
Elongation in 2 in. or 50 mm, min, %: |
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Wall Thickness |
Grade 3 |
Grade 6 |
|||
|
in. |
mm |
Longitudinal |
Transverse |
Longitudinal |
Transverse |
|
5/16 (0.312) |
8 |
30 |
20 |
30 |
16 |
|
9/32 (.281) |
7.2 |
28 |
19 |
28 |
15 |
|
1/4 (.250) |
6.4 |
27 |
18 |
27 |
15 |
|
7/32 (.219) |
5.6 |
26 |
 |
26 |
 |
|
3/16 (.188) |
4.8 |
24 |
 |
24 |
 |
|
5/32 (.156) |
4 |
22 |
 |
22 |
 |
|
1/8 (.125) |
3.2 |
21 |
 |
21 |
 |
|
3/32 (.094) |
2.4 |
20 |
 |
20 |
 |
|
1/16 (.063) |
1.6 |
18 |
 |
18 |
 |
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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 |
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|
 |
ft-lbf |
J |
ft-lbf |
J |
Grade |
Min Impact |
|
|
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 |
 |  |  |
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