ASTM B463 Alloy 20 Plate Sizes:
Thickness: ASTM B463 Alloy 20 plates can be manufactured in a thickness range from 0.1875 inches (4.76 mm) to 4.000 inches (101.6 mm).
Width: The width of 2.4660 Alloy 20 plates can be up to 48 inches (1219.2 mm).
Length: The length of Carpenter 20 plates can be up to 144 inches (3657.6 mm).
ASTM B463 UNS N08020 Sheet Tolerances:
The standard typically specifies tolerances for dimensions such as thickness, width, and length to ensure product uniformity and quality. These tolerances may vary depending on the specific requirements of the application and the manufacturing process. It's essential to refer to the latest version of ASTM B463 for specific tolerance values and guidelines.
Permissible Variations in Thickness for Hot-Rolled Sheets in Cut Lengths, Cold-Rolled Sheets in Cut Lengths and Coils
| Specified Thickness,A in.(mm) | Permissible Variations,Over and UnderB |
|
| in. | mm | |
| Over 0.145(3.68)to less than 3/16(4.76) Over 0.130(3.30)to 0.145 (3.68),incl Over 0.114(2.90)to 0.130(3.30),incl Over 0.098(2.49)to 0.114(2.90),incl Over 0.083(2.11)to 0.098(2.49),incl Over 0.072(1.83)to 0.083 (2.11),incl Over 0.058(1.47)to 0.072(1.83),incl Over 0.040(1.02)to 0.058(1.47),incl Over 0.026(0.66)to 0.040(1.02),incl Over 0.016(0.41)to 0.026 (0.66),incl Over 0.007 (0.18)to 0.016 (0.41),incl Over 0.005(0.13)to 0.007 (0.18),incl 0.005 (0.13) |
0.014 0.012 0.010 0.009 0.008 0.007 0.006 0.005 0.004 0.003 0.002 0.0015 0.001 |
0.36 0.30 0.25 0.23 0.20 0.18 0.15 0.13 0.10 0.08 0.05 0.04 0.03 |
AThickness measurements are taken at least 3⁄8in. (9.52 mm) from the edge of the sheet.
BCold-rolled sheets in cut lengths and coils are produced in some type numbers and some widths and thicknesses to tolerances less than those shown in the table.
Permissible Variations in Width and Length for Hot Rolled Resquared Sheets (Stretcher Leveled Standard of Flatness)
| Specified Dimensions,in.(mm) | Tolerances | ||
| Over | Under | ||
| in. | mm | ||
| For thicknesses under 0.131 (3.33): | |||
| Widths up to 48(1219),excl | 1/16 | 1.59 | 0 |
| Widths 48 (1219)and over | 1/8 | 3.18 | 0 |
| Lengths up to 120 (3048),excl | 1/16 | 1.59 | 0 |
| Lengths 120 (3048)and over | 1/8 | 3.18 | 0 |
| For thicknesses 0.131 (3.33)and over | |||
| All widths and lengths | 1/4 | 6.35 | 0 |
Permissible Variations in Flatness for Hot-Rolled and Cold-Rolled Sheets Specified to Stretcher-Leveled Standard of Flatness
| Specified Thickness in.(mm) |
Width, in.(mm) |
Length, in.(mm) |
Flatness Tolerance,A in.(mm) |
|||
| Under 3/16(4.76) | to 48(1219),incl | to 96(2438),incl | 1/8(3.18) | |||
| Under 3/16(4.76) | to 48(1219),incl | over 96 (2438) | 1/4(6.35) | |||
| Under 3/16(4.76) | over 48(1219) | to 96(2438),incl | 1/4(6.35) | |||
| Under 3/16(4.76) | over 48(1219) | over 96(2438) | 1/4(6.35) | |||
AMaximum deviation from a horizontal flat surface.
Permissible Variations in Weight for Hot-Rolled and Cold-Rolled Sheets
| Any item of five sheets or less,or any item estimated to weigh 200 Ib(90.72 kg)or less,may actually | weight 200 Ib (90.72 kg)or less |
| weigh as much as 10 %over the theoretical weight | |
| Any item of more than five sheets and estimated to weigh more than 200 Ib(90.72 kg),may actually | weigh more than 200 Ib (90.72 kg) |
| weigh as much as 71z %over the theoretical weight | |
| Chromium-manganese-nickel | 40.7 Ib/ft²·in.thickness (7.82 kg/m² ·mm thickness) |
| Chromium-nickel | 42.0 Ib/ft²·in.thickness (8.07 kg/m² ·mm thickness) |
| Chromium | 41.2 Ib/ft²·in.thickness (7.92 kg/m² ·mm thickness) |
