FORTUNE MATERIAL LIMITED

Room 510, No. 1165, Jiangning Road, 200060, Shanghai

TEL: +86-21 6180 0051 FAX: +86-21 6130 3552 EXT 6601

A269 Welded and Seamless
General Service
Size
Inches / Tolerances, 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
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
Over 5-1/2 to 8 / ±0.030 / ±10% / ——
(b) For cut lengths 24 feet or less. Over 24 feet add 1/8 inch per 10 feet to 1/2 inch maximum tolerance. Tubes not heat-treated to be stencilled: “HT-O”.
Tests per ASTM A269 and A450*
·  Flare for seamless tubes
·  Flange for welded tubes
·  Reverse flatten for welded tubes
·  Hardness: Rockwell B90 or BHN 200 maximum
·  Hydrotest: At 1000 to 4500 psi depending on diameter provided stress does not exceed 26,000 or 24,000 psi maximum if ordered per P=2St/D.
·  Alternate: Non-destructive electrical test permitted unless order specifies which test to be used. Test to A450.
·  For details, refer to A450 specification.
STAINLESS STEEL PIPE
ASTM A312/ASME SA312
Permissible Variations in Outside Diameter
NPS Designator
Inches / Permissible Variations in Outside Diameter
Over
In. / Under
In.
1/8 to 1-1/2 incl / 1/64 (0.015) / 1/32 (0.031)
Over 1-1/2 to 4 incl / 1/32 (0.031) / 1/32 (0.031)
Over 4 to 8 incl / 1/16 (0.062) / 1/32 (0.031)
Over 8 to 18 incl / 3/32 (0.093) / 1/32 (0.031)
Over 18 to 26 incl / 1/8 (0.125) / 1/32 (0.031)
Over 26 to 34 incl / 5/32 (0.156) / 1/32 (0.031)
Over 34 to 48 incl / 3/16 (0.187) / 1/32 (0.031)
NOTE:
The above tolerances on outside diameter include ovality except for thin-wall pipe. Thin-wall pipe usually develops significant ovality (out-of-roundness) during final annealing, straightening, or both. Thin-wall pipe is defined as having a wall thickness of 3 percent or less of the outside diameter. The above diameter tolerances are not sufficient to provide for additional ovality except in thin-wall pipe and are applicable only to the mean of the extreme (maximum and minimum) outside diameter readings in any one cross-section. However, for thin-wall pipe the difference in extreme outside diameter readings (ovality) in any one cross-section shall not exceed 1.5 percent of the specified outside diameter.
Permissible Variations in Wall Thickness
Seamless and welded (no filler metal added).
The minimum wall thickness at any point shall not be more than 12.5 percent under the nominal wall thickness specified.