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.