STAINLESS ASTM/ASME SPECIFICATIONS

A249 Welded and Cold Worked
Reference: ASME SA249

OD Size
Inches
Tolerances, Inches
OD,
Inches
Wall
Cut
Length (a), In.
Less than 1
±0.004
All Sizes
± 10%
+1/8–0
1 to 1-1/2
±0.006
Over 1-1/2 to 2
±0.008
Over 2 to 2-1/2
±0.010
+3/16–0
Over 2-1/2 to 3
±0.012
Over 3 to 4
±0.015
Over 4 to 5
+0.015
– 0.025

(a) For lengths 24 feet or less. Over 24 feet add 1/8 inch per 10 feet to 1/2 inch maximum tolerance. Specification size range: 1/2 inch to 5 inch OD x 0.015 to 0.320 minimum walls.

Tests per ASTM A249 and A450*

  • Flatten H=((1+0.09)t) divided by (0.09+t/D)
  • Flange
  • Reverse bend
  • Hardness: Rockwell B90 maximum
  • Yield Strength: “L” grades 25,000 psi minimum. Other grades
    30,000 psi minimum
  • Tensile Strength: “L” grades 70,000 psi minimum. Other grades
    75,000 psi minimum
  • Elongation in 2 inch = 56t+17.50
  • Hydrotest: P=2 St/D, S=16,000 or 24,000 psi maximum if ordered
  • Alternate: Non-destructive electrical test permitted unless order specifies test to be used. Test to A450.

NOTE: Refer to A450, paragraph 13 in ASTM HANDBOOK for Ovality Tolerance of Thin Wall Tubes.