ASTM B575 plate Sheet Strip Coil Tolerance
The tolerance specifications for ASTM B575 plates, sheets, strips, and coils vary depending on factors such as material thickness, width, and length. ASTM B575 covers nickel-chromium-iron-molybdenum-copper alloys (UNS N06007, N06975, N06985, and N06030) and nickel-chromium-molybdenum alloys (UNS N10276/Hastelloy C276 and N06022/Hastelloy C22) in various forms, including plate, sheet, strip, and coil.
ASTM B575 specifies four product forms: sheet, plate, coil and strip. Among them, Plate is produced by a hot rolling process with thicker walls. The sheet is mainly produced by the process of cold rolling, and the wall thickness is relatively thin. Strip is also produced by cold rolling, but in narrower widths and is supplied in coil form.
Tolerance requirements for materials are not directly listed in ASTM B575. But the standard specifies that the tolerances of the material should be in accordance with ASTM B906.
| Specified Thickness, in. (mm) |
Permissible Variations in Thickness, in. (mm) |
|
|---|---|---|
| + | - | |
| 3/16 to 7/32 (4.762 to 5.556), incl | 0.021 (0.53) | 0.010 (0.25) |
| Over 7/32 to 1/4 (5.556 to 6.350), incl | 0.024 (0.61) | 0.010 (0.25) |
| Over 1/4 to 3/8 (6.350 to 9.525), incl | 0.027 (0.69) | 0.010 (0.25) |
| Over 3/8 to 1/2 (9.525 to 12.70), incl | 0.030 (0.76) | 0.010 (0.25) |
| Over 1/2 to 5/8 (12.70 to 5.88), incl | 0.035 (0.89) | 0.010 (0.25) |
| Over 5/8 to 3/4 (15.88 to 19.05), incl | 0.040 (1.02) | 0.010 (0.25) |
| Over 3/4 to 7/8 (19.05 to 22.25), incl | 0.045 (1.14) | 0.010 (0.25) |
| Over 7/8 to 1 (22.25 to 25.4), incl | 0.050 (1.27) | 0.010 (0.25) |
| Over 1 to 2 1/2 (25.4 to 63.5), incl | 5 | 0.010 (0.25) |
| Specified Thickness, in. (mm) |
Permissible Variations in Thickness, in (mm) (All Widths) |
|||||
|---|---|---|---|---|---|---|
| + | - | |||||
| 0.020 to 0.034 (0.51 to 0.86), incl |
0.004 (0.10) | 0.004 (0.10) | ||||
| Over 0.034 to 0.056 (0.86 to 1.42), incl |
0.005 (0.13) | 0.005 (0.13) | ||||
| Over 0.056 to 0.070 (1.42 to 1.78), incl |
0.006 (0.15) | 0.006 (0.15) | ||||
| Over 0.070 to 0.078 (1.78 to 1.98), incl |
0.007 (0.18) | 0.007 (0.18) | ||||
| Over 0.078 to 0.093 (1.98 to 2.36), incl |
0.008 (0.20) | 0.008 (0.20) | ||||
| Over 0.093 to 0.109 (2.36 to 2.77), incl |
0.009 (0.23) | 0.009 (0.23) | ||||
| Over 0.109 to 0.125 (2.77 to 3.18), incl |
0.010 (0.25) | 0.010 (0.25) | ||||
| Over 0.125 to 0.140 (3.18 to 3.56), incl |
0.013 (0.33) | 0.010 (0.25) | ||||
| Over 0.140 to 0.171 (3.56 to 4.34), incl |
0.016 (0.41) | 0.010 (0.25) | ||||
| Over 0.171 to 0.187 (4.34 to 4.75), incl |
0.018 (0.46) | 0.010 (0.25) | ||||
| Specified Thickness, in. (mm) | Specified Width, in. (mm) | Permissible Variations in Specified Width, in. (mm) | |
|---|---|---|---|
| + | - | ||
| Sheet | |||
| 0.187 (4.76) and under | 2 (50.8) and over | 0.125 (3.18) | 0 |
| Strip (Slit Edges) | |||
| Over 0.020 to 0.075 (0.51 to 1.90), incl | 24 (610) and under | 0.007 (0.18) | 0.007 (0.18) |
| Over 0.075 to 0.100 (1.90 to 2.54), incl | 24 (610) and under | 0.009 (0.23) | 0.009 (0.23) |
| Over 0.100 to 0.125 (2.54 to 3.18), incl | 24 (610) and under | 0.012 (0.30) |
0.012 (0.30) |
Notes
- The edgewise curvature (depth of chord) of flat sheet, strip, and plate shall not exceed 0.05 in. (1.27 mm) multiplied by the length in feet or 0.04 mm multiplied by the length in centimetres. Straightness for coiled strip is subject to agreement between the manufacturer and the purchaser.
- For sheets of all thicknesses and widths of 6 in. (152.4 mm) or more, the angle between adjacent sides shall be 90±0.15°
- Plate, sheet, and strip shall be commercially flat.
Average Grain Size
For annealed sheets, the standard specifies the average grain size of the material. The grain size of sheets with thickness below 3.175mm should be controlled at ASTM No.3 or finer. Sheets with a thickness of more than 3.175mm should reach the grain size of ASTM No.1.5 or finer.
