Firmetal Co., Ltd.

Products - Niobium

ASTM B394: Dimensional Tolerances for Nb and Nb Alloy Seamless and Welded Tubes

ASTM B394: Dimensional Tolerances for Nb and Nb Alloy Seamless and Welded TubesA
Normal Outside Diameter in. (mm)B	Variation in Outside Diameter, over and under in. (mm)B	Variation in Inside Diameter, over and under in. (mm)C	Variation in Wall Thickness, over and under %C,D
0.187 to 0.625 (4.7 to 15.9) excl	0.004 (0.10)	0.004 (0.10)	10
0.625 to 1.000 (15.9 to 25.4) excl	0.005 (0.13)	0.005 (0.13)	10
1.000 to 2.000 (25.4 to 50.8) excl	0.0075 (0.19)	0.0075 (0.19)	10
2.000 to 3.000 (50.8 to 76.2) excl	0.010 (0.25	0.010 (0.25)	10
3.000 to 4.000 (76.2 to 101.5) excl	0.0125 (0.32)	0.0125 (0.32)	10
Straightness		Length Variation
Length ft. (m)	Maximum Curvature Depth of Arc	Up to 6 ft Over 6 ft.	+1/8 in. +1/4 in.
3 to 6 (0.91 to 1.83 incl	1/8 in. (3.2 mm)
6 to 8 (1.83 to 2.44) incl	3/16 in. (4.8 mm)
8 to 10 (2.44 to 3.05) incl	1/4 in. (6.4 mm)
Over 10 (3.05)	1/4 in./any 10 ft. (2.1 mm/m)