NH2749

NH2749 Description

NH2749 New Materials

NH2749 high-temperature resistant new material is a new type of high-temperature furnace tube material, mainly composed of nickel, chromium, aluminum and other elements, with excellent oxidation resistance and thermal corrosion resistance. The addition of tungsten and other rare and precious metals gives it excellent high-temperature endurance strength. Its unique composition ratio enables it to exhibit excellent long-lasting strength, stability, oxidation resistance, and corrosion resistance in high-temperature environments, making it an ideal choice for high-temperature furnace tubes that can be used for a long time at temperatures up to 1150 ℃.

Basic Performance

Basic properties of NH2749 new material

Microstructure

Austenite + carbide

Mechanical properties

Room temperature performance

Alloy Designation	Tensile Strength Rm（MPa）	Yield Strength Rp0.2（MPa）	Elongation A（%）
NH1949	500	350	3
NH2749	550	400	3
NH25-35Mic	450	250	8
NH35-45Mic	450	250	5
NH28-48W5	490	285	4

High-temperature, short-duration performance

Temperature	Alloy Designation	Tensile Strength Rm (MPa)	Yield Strength Rp0.2(MPa)	Elongation A(%)
1000℃	NH1949	124	60	30
	NH2749	126	76	36.5
	NH25-35Mic	101	59	50
	NH35-45Mic	115	66	40
	NH28-48W5	120	70	45
1100℃	NH1949	81	41	44.5
	NH2749	84	42	39
	NH25-35Mic	70	45	49.5
	NH35-45Mic	66	41	51
	NH28-48W5	70	45	50

Antioxidant properties

The slope of the oxidation weight gain curve is small, indicating excellent antioxidant performance

Oxidation weight gain curve exposed to air at 1100 ℃ for 100 hours

100,000-hour stress rupture strength

Due to its higher sustained strength and superior resistance to corrosion, carburization, and oxidation at high temperatures, NH2749 can be used in environments with temperatures exceeding 1185℃.