ASTM B443 Introduction
Standard Specification for Nickel-Chromium-Molybdenum-Columbium Alloy and Nickel-Chromium-Molybdenum-Silicon Alloy Plate, Sheet, and Strip
ASTM B443 ASME SB 443 specification covers rolled nickel-chromium-molybdenum-columbium alloy (UNS No. N06625) and nickel-chromium-molybdenum-silicon alloy (UNS No. N06219) plates, sheets, and strips. N06625 alloys shall be furnished in two grades of different heat treatment conditions: ASTM B443 Grade 1 (annealed); and Grade 2 (solution annealed).
ASTM B443 Plate Sheet Properties
ASTM B443 standard covers two materials: nickel-chromium-molybdenum-niobium alloy (Inconel 625 UNS N06625) and nickel-chromium-molybdenum-silicon alloy (UNS N06219). Among them, ASTM B443 Inconel 625 is the more commonly used alloy. The elements nickel and chromium give both alloys excellent resistance to oxidation. The molybdenum element ensures the material's resistance to reduction. In ASTM B443 UNS N06625, niobium plays an important role in solid solution strengthening, It gives the alloy greater strength.
Room Temperature Tensile Properties and Heat Treatment
|
Product |
Tensile Strength, min, ksi (MPa) |
Yield Strength (0.2 % Offset), min, ksi (MPa) |
Elongation in 2 in. or 50 mm (or 4D), min, % |
|---|---|---|---|
| Grade 1 UNS N06625 (Annealed) | |||
| Cold-rolled sheet and strip | 120 (827) | 60 (414) | 30 |
| Hot-rolled sheet and hot-rolled plate up to 2.75 in. (70 mm), incl | 110 (758) | 55 (379) | 30 |
| Cold-rolled plate up to 0.375 in. (9.5 mm), incl | 110 (758) | 55 (379) | 30 |
| Grade 2 UNS N06625 (Solution Annealed) | |||
| Cold-rolled sheet and strip, hot-rolled sheet, cold-rolled plate, and hot-rolled plate |
100 (690) | 40 (276) | 30 |
| Specified Thickness, in. (mm) | Permissible Excess in Average Weight, B, C per Square Foot of Plates for Widths Given in Inches (Millimetres) Expressed in Percent of Nominal Weights |
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Under 48 (1220) |
48 to 60 (1220 to 1520), excl |
60 to 72 (1520 to 1830), excl |
72 to 84 (1830 to 2130), excl |
84 to 96 (2130 to 2440), excl |
96 to 108 (2440 to 2740), excl |
108 to 120 (2740 to 3050), excl |
120 to 132 (3050 to 3350), excl |
132 to 144 (3350 to 3660), excl |
144 to 160 (3660 to 4070), excl |
|
| 3/16 to 5/16 (4.8 to 7.9), excl | 9.0 | 10.5 | 12.0 | 13.5 | 15.0 | 16.5 | 18.0 | ... | ... | ... |
| 5/16 to 3/8 (7.9 to 9.5), excl | 7.5 | 9.0 | 10.5 | 12.0 | 13.5 | 15.0 | 16.5 | 18.0 | ... | ... |
| 3/8 to 7/16 (9.5 to 11.1), excl | 7.0 | 7.5 | 9.0 | 10.5 | 12.0 | 13.5 | 15.0 | 16.5 | 18.0 | 19.5 |
| 7/16 to 1/2 (11.1 to 12.7), excl | 6.0 | 7.0 | 7.5 | 9.0 | 10.5 | 12.0 | 13.5 | 15.0 | 16.5 | 18.0 |
| 1/2 to 5/8 (12.7 to 15.9), excl | 5.0 | 6.0 | 7.0 | 7.5 | 9.0 | 10.5 | 12.0 | 13.5 | 15.0 | 16.5 |
| 5/8 to 3/4 (15.9 to 19.1), excl | 4.5 | 5.5 | 6.0 | 7.0 | 7.5 | 9.0 | 10.5 | 12.0 | 13.5 | 15.0 |
| 3/4 to 1 (19.1 to 25.4), excl | 4.0 | 4.5 | 5.5 | 6.0 | 7.0 | 7.5 | 9.0 | 10.5 | 12.0 | 13.5 |
| 1 to 2 (25.4 to 50.8), incl | 4.0 | 4.0 | 4.5 | 5.5 | 6.0 | 7.0 | 7.5 | 9.0 | 10.5 | 12.0 |
