ASTM A512 Cold-Drawn Buttweld Carbon Mechanical Tubing
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Buttweld mechanical tubing is made from buttwelded or continuous welded tube hollows, drawn to size with a mandrel. It is produced in OD sizes ranging from 1/4 inch to 3-1/2 inch OD. The tubing is cold drawn for the purpose of obtaining dimensional accuracy and improved mechanical properties. Applications include axles, truck and railroad parts, and many more where weight-to-strength ratio and tolerances are important.
ASTM A512 ASME SA512 Standard for Cold-Drawn Buttweld Carbon Steel Mechanical Tubing covers cold-drawn buttweld carbon steel tubes for use as round, square, rectangular or special shape mechanical tubing. The carbon steel can be made unless a specific type of melting process is required by the purchaser.
This specification covers cold-drawn buttweld carbon steel tubes for use as mechanical tubing.
This specification covers round, square, rectangular, and special shape mechanical tubing.
Round tube size ranges covered are outside diameters up to 3 1/2 in. (88.9 mm) and wall thickness from 0.035 to 0.500 in. (0.89 to 12.70 mm).
Diameter
(Including Ovality) Mandrel Down
OD Size
Range Inches |
OD
Tolerance Inches |
ID
Tolerlance Inches |
0.500 to 1.499
|
+0.005
|
+0.000
|
– 0.000
|
– 0.005*
|
|
1.500 & Over
|
+0.010
|
+0.000
|
– 0.000
|
– 0.010
|
*Under 0.500 inch ID a greater tolerance may be required.
STANDARD DIMENSIONAL TOLERANCES — Round Tubing
Wall
Mandrel drawn plus or minus 7 percent, except when walls are lighter than 0.156 inch, the tolerance is plus or minus 10 percent.
Length
Mandrel Drawn
Length Range
Fleet |
OD Size Range
Inches |
Tolerance
Inches |
4 and less
|
to 2.000
|
+1/16-0
|
4 and less
|
2.001 & Over
|
+3/32-0
|
4 to 10
|
to 2.000
|
+3/32-0
|
4 to 10
|
2.001 & Over
|
+1/8 -0
|
Over 10
|
All
|
+1/8 -0
|
Straightness — Mandrel Drawn
0.030 inch maximum deviation from a straight line in a three foot length. Under three feet, 0.010 inch per foot. Soft annealed tubing or small diameter long lengths may exceed these figures.
Concentricity — Mandrel Drawn
5 percent of the wall. The wall is calculated from the mean OD and mean ID after applying standard tolerances. 5 percent eccentricity equals 10 percent total indicator reading when chucked on the OD and gaged on the ID or vice versa
MECHANICAL PROPERTIES
|
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Grade
|
Minimum
Yield, PSI |
Minimum
Tensile, PSI |
Elongation
Percent in 2 In. |
Minimum
Hardiness Rockwell B |
C-1010
|
58,000
|
63,000
|
15
|
70
|
C-1012
|
58,000
|
63,000
|
15
|
70
|
C-1015
|
60,000
|
66,000
|
14
|
72
|
C-1016
|
61,500
|
67,000
|
13
|
73
|
C-1018
|
62,500
|
68,000
|
13
|
73
|
C-1020
|
65,000
|
71,000
|
11
|
73
|
C-1030
|
70,000
|
80,000
|
10
|
80
|
C-1110
|
58,000
|
63,000
|
15
|
70
|
C-1115
|
62,500
|
68,000
|
13
|
73
|
*Soft and intermediate annealed tubing is also available.
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