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⒈Tensile and Hardness Properties
The material shall conform to the tensile and hardness properties prescribed in Table 4.
⒉Permissible Variations in Dimensions
Variiations in outside diameter,wall thickness,and length from those specified shall not exceed the amoounts prescribed in Table 5.
The permissible varations in outside diameter given in Table 5 are not sufficient to provide for ovality in thin-walled tubes,as defined in the table.In such tubes,the maximum and minimum diameters at any cross sction shall debiate from the niminal diamter by no more than weice the permissible variation in outside diameter given in Table 5; however,the mean diameter at that cross section must still be within the given permissible variation.
Table 5 Permissible Variations in Dimensions
| Group |
Size,Outside Diameter, in[mm] |
Permissible Variations in Outside Diameter,in. [mm] | Average WallD Permissible Variations in Wall ThicknessA,% | Minmum WallE Permissible Variations in Wall Thickness,A% |
Permissible Variations in Cut Length, in B[mm] |
Thin Walled TubesC | ||
| Over | Under | Over | Under | |||||
| 1 | up to 1/2[12.7],excl | ±0.005[0.13] | ±15 | 30 | 0 | 1/8[3] | 0 | ... |
| 2 | 1/2 to 1 1/2[12.7 to 38.1],excl | ±0.005[0.13] | ±10 | 20 | 0 | 1/8[3] | 0 | less than 0.065 in.[1.6 mm] specified |
| 3 | 1 1/2 to 3 1/2 [38.1 to 88.9],eccl | ±0.010[0.25] | ±10 | 20 | 0 | 3/16[5] | 0 | less than 0.095 in.[2.4 mm] specified |
| 4 | 3 1/2 to 5 1/2 [88.9 to 139.7],excl | ±0.015[0.38] | ±10 | 20 | 0 | 3/16 [5] | 0 | less than 0.150 in. [3.8 mm] specified |
| 5 | 5 1/2 to 8 [139.7 to 203.2],incl | ±0.030[0.76] | ±10 | 20 | 0 | 3/16 [5] | 0 | less than 0.150 in[3.8 mm] specified |
|
A When tubes as ordered require wall thickness 3/4 in.[19 mm] or over,or an inside diameter 60% or less of the outside diameter, a wider variation in wall thickness is required.On such sizes a veration in average wall thickness of 12.5 % over or under,or a variation in minimum wall thickness of 25.0% over and 0% under,shall be permitted. For tubes less than 1/2 in.[12.7 mm] in inside diameter than connot be successfully drawn over a mandrel,the average wall thickness may vary ± 15% from that specified or the minimum wall thickness may bary by +30%,-0% from that specified. B Theses tolerances apply to cut lengths up to and including 24 ft [7.3 m].For lengths greater than 24 ft [7.3 m],the above over-tolerances shall be increased by 1/8 in.[3 mm] for each 10 ft [3 m] or fraction thereof over 24 ft or 1/2 in.[13 mm],whichever is the lesser. C Ovality provisions of 12.2 apply. D Applicable to tubing specified as average wall [see 3.1.4]. E Applicable to tubing specified as minimum wa;;[see 3.1.4]. |
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