TOLERANCE OF ASTM SPECIFICATION STAINLESS STEEL TUBES AND PIPES
| Specification | Allowable Outside Diameter Variation in mm | Allowable Wall Thickness Variation | Exact Length Tolerances in mm | Testing | ||||
|---|---|---|---|---|---|---|---|---|
| Diameter | Over | Under | Over % | Under % | Over % | Under % | ||
| ASTM A-270 Seamless & Welded Sanitary Tubes | 25.4 | 0.05 | 0.20 | 12.5 | 12.5 | 3.2 | 0 | Reverse Flattening Test 100%, Hydrostatic Test External polish on all tubes Refer ASTM A-270 |
| 38.1 | 0.05 | 0.20 | 12.5 | 12.5 | 3.2 | 0 | ||
| 50.8 | 0.05 | 0.28 | 12.5 | 12.5 | 3.2 | 0 | ||
| 63.5 | 0.05 | 0.28 | 12.5 | 12.5 | 3.2 | 0 | ||
| 76.2 | 0.08 | 0.30 | 12.5 | 12.5 | 3.2 | 0 | ||
| 101.6 | 0.08 | 0.38 | 12.5 | 12.5 | 3.2 | 0 | ||
| ASTM A-249 Welded Boiler, Superheater, Heat Exchanger & Condenser Tubes | Under 25.4 | 0.1016 | 0.1016 | 10 | 10 | 3.175 | 0 | Tension Test, Flattening Test, Flare Test, * Reverse Bend Test, Hardness Test, 100% Hydrostatic Test *Reverse Flatteing Test Refer ASTM A-450 whenever applicable |
| 25.4–38.1 | 0.1524 | 0.1524 | 10 | 10 | 3.175 | 0 | ||
| 38.1–50.8 | 0.2032 | 0.2032 | 10 | 10 | 3.175 | 0 | ||
| 50.8–63.5 | 0.2540 | 0.2540 | 10 | 10 | 3.76 | 0 | ||
| 63.5–76.2 | 0.3048 | 0.3048 | 10 | 10 | 4.76 | 0 | ||
| 76.2–101.6 | 0.3810 | 0.3810 | 10 | 10 | 4.76 | 0 | ||
| ASTM A-312 Seamless & Welded Pipes Test | 13.7–48.3 | 0.40 | 0.79 | Min wall tubes 12.5% under nominal wall specified | 6.4 | 0 | 0 | Tension Test, Flattening Test, 100% Hydrostatic Test Normally Random Lengths orderded |
| 48.3–114.3 | 0.79 | 0.79 | 6.4 | 0 | 0 | |||
| 114.3–220 | 1.59 | 0.79 | 6.4 | 0 | 0 | |||
| ASTM A-269 Seamless & Welded Pipes Service | Up to 12.7 | 0.13 | 0.13 | 15 | 15 | 3.2 | 0 | Tension Test, Flange Test (Welded Only), Hardness Test, 100% Hydrostatic Test, *Reverse Flatteing Test (Welded only) Refer to ASTM A-269 |
| 12.7–38.1 excl. | 0.13 | 0.13 | 10 | 10 | 3.2 | 0 | ||
| 38.1–88.9 excl. | 0.25 | 0.25 | 10 | 10 | 4.8 | 0 | ||
| 88.9–139.7 excl. | 0.38 | 0.38 | 10 | 10 | 4.8 | 0 | ||
| 139.7–203.3 excl. | 0.76 | 0.76 | 10 | 10 | 4.8 | 0 | ||
| ASTM A-213 Seamless Boiler, Superheater & Heat Exchanger Tubes | Under 25.4 | 0.1016 | 0.1016 | 20 | 0 | 3.175 | 0 | Tension, Flattening, Hardness Test, 100% Hydrostatic Test Refer to ASTM A-450 |
| 25.4–38.1 incl. | 0.1524 | 0.1524 | 20 | 0 | 3.175 | 0 | ||
| 38.1–50.8 excl. | 0.2032 | 0.2032 | 22 | 0 | 3.175 | 0 | ||
| 50.8–63.5 excl. | 0.2540 | 0.2540 | 22 | 0 | 3.76 | 0 | ||
| 63.5–76.2 excl. | 0.3048 | 0.3048 | 22 | 0 | 4.76 | 0 | ||
| 76.2-101.6 excl. | 0.3810 | 0.3810 | 22 | 0 | 4.76 | 0 | ||
| ASTM A-268 Seamless & Welded Ferritic Stainless Steel Tubes | Up to 12.7 | 0.13 | 0.13 | 15 | 15 | 3.2 | 0 | Tension Test, Flange Test (CREW only), Hardness Test, 100% Hydrostatic Test Reverse Flattening Test |
| 12.7–38.1 excl. | 0.13 | 0.13 | 10 | 10 | 3.2 | 0 | ||
| 38.1–88.9 excl. | 0.25 | 0.25 | 10 | 10 | 4.8 | 0 | ||
| 88.9–168.9 excl. | 0.38 | 0.38 | 10 | 10 | 4.8 | 0 | ||
| ASTM A-358 for Welded Pipes Big Diameter Pipes | For All Sizes | 0.5 | 0.5 | No Limit | 0.3 mm | Customer Specification | - | |