Wall Thickness of Stainless Steel Pipe
The wall thickness of stainless steel pipe cannot be the same everywhere, and there are objectively unequal wall thicknesses in the cross section and longitudinal pipe body, that is, uneven wall thickness. In order to control this non-uniformity, some stainless steel pipe standards such ASTM A312, ASTM A999 stipulate the allowable index of uneven wall thickness, which is generally specified not to exceed 80% of the wall thickness tolerance (implemented after negotiation between the supplier and the buyer).
ASTM A269 Welded and Seamless General Service
| Tolerances, Inches | Tolerances, Inches | Tolerances, Inches | Tolerances, Inches | |
| Size Inches | OD, Inches | Wall | Ovality 2 x Tol., In. | Cut Length (b), In. |
| Less than 1/2 | ±0.005 | ±15% | —— | +1/8 –0 |
| Over 1/2 to 1-1/2 | ±0.005 | ±10% | –0.065 | +1/8 –0 |
| Over 1-1/2 to 3-1/2 | ±0.010 | ±10% | –0.095 | +3/16 –0 |
| Over 3-1/2 to 5-1/2 | ±0.015 | ±10% | –0.150 | +3/16 –0 |
| Over 5-1/2 to 8 | ±0.030 | ±10% | —— | +3/16 –0 |
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