Generally, Inconel alloy 625 plate, sheet and strip shall be manufactured in accordance with ASTM B443/ ASME SB-443. Designated as UNS N06625, the material has a nominal chemical composition of 60Ni-22Cr-9Mo-3.5Cb, which indicates that it is a nickel-chromium-molybdenum-columbium alloy. The Inconel 625 alloy plate, sheet and strip can be furnished in two grades of different heat-treated conditions: Grade 1 (annealed) – Material is normally employed in service temperatures up to 1100°F (593°C); Grade 2 (solution annealed) – Material is normally employed in service temperatures above 1100°F (593°C) when resistance to creep and rupture is required.

Conventionally, the Inconel alloy 625 plate, sheet, and strip can be defined or clarified roughly based on its thickness: plates – with thickness ≥ 0.188″ (4.8 mm), hot-rolled or cold-rolled, especially that cold-rolled plates are available in thickness from 0.188″ (4.8 mm) to 3/8″ (9.5 mm); sheets – with thickness from 0.018″(0.46 mm) to 0.188″ (4.8 mm), available in both hot-rolled and cold rolled conditions; strip – with thickness from 0.005″ (0.13 mm) to 0.018″ (0.46 mm), available only in cold-rolled condition. The alloy 625 plates are generally furnished with sheared or cut edges while sheets and strips are usually furnished with sheared or slit edges. The cutting methods include machined, abrasive cut, powder cut, inert arc cut, plasma-torch cut, etc.

Chemical Composition Requirements

Chemical requirements according to ASTM B443/ ASME SB-443 are: carbon ≤ 0.10%, manganese ≤ 0.50%, silicon ≤ 0.50%, phosphorus ≤ 0.015%, sulfur ≤ 0.015, chromium: 20.0%~23.0%, columbium + tantalum: 3.15%~4.15%, cobalt ≤ 1.0%, molybdenum ≤ 8.0%~10.0%, iron ≤ 5.0%, aluminum ≤ 0.40%, titanium ≤ 0.40%, nickel ≥ 58.0%.

Mechanical Properties at Room Temperature

Product & Heat Treatment	Tensile Strength, min. ksi (MPa)	Yield Strength, 2% offset min. ksi (MPa)	Elongation in 2", min. %
A	120 (827)	60 (414)	30
B	110 (758)	55 (379)	30
C	110 (758)	55 (379)	30
D	100 (690)	40 (276)	30

*A, B, and C refer to annealed alloy 625 (UNS N06625) of cold-rolled sheet and strip, hot-rolled sheet and hot-rolled plate, cold-rolled plate, respectively. D refers to solution annealed alloy 625 (UNS N06625) of cold-rolled sheet and strip, hot-rolled sheet, cold-rolled and hot-rolled plate.

ASME Codes Applicability

The solution annealed Inconel alloy 625 plate, sheet and strip can be applied to ASME Boiler & Pressure Vessel Codes of Section I, Section VIII Division 1, Section XII with maximum temperature limits of 1100°F, 1600°F, 650°F, respectively. The annealed Inconel alloy 625 plate, sheet and strip can be applied to Section I, Section III Class 2 and 3, Section VIII Division 1, Section XII, with maximum temperature limits of 1100°F, 800°F, 1200°F, 650°F, respectively. You may contact us (info@metalspiping.com) to get the information on allowable stresses at elevated temperatures.