COLD DRAWN BUTTWELD MECHANICAL TUBINGASTM A-512 |
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.
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
|
ROUND TUBING TOLERANCES
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
|
||||
|
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.