CrN70U pipe - EI652

International Equivalent

Mark	Analogue	W. Nr.	Aisi Uns	En	Order
XN70YU	EI652	2.4872	N06008		Delivery from the stock, in stock
XN70Yu-N	EI652				Delivery from the stock, in stock

Production of CrN70U

Tube grade KhN70Yu (previously designated as EI652) is made of heat resistant alloy based on nickel, which contains 65.073 - 71.2%. This heat resistant alloy refers to the "alloyed". In addition to nickel in the composition of CHN70Yu includes chromium 26 - 29%. Therefore, the alloy KhN70Yu is also designated as chromium-nickel. As additives are used: aluminum 2.8 - 3.5%, iron - up to 1%, barium - no more than 0.10%, manganese - up to 0.3%, cerium - less than 0,03%, silicon - up to 0,8%, phosphorus - not more than 0,015%, copper - up to 0,07%, sulfur - up to 0,012%.

Percentage composition (GOST 5632-72)

Alloy	C	Fe	Mn	P	S	Ni	Cr	Cu	Al	Si	Ce	Ba
CRN70U	≤0.1	≤1	≤0.3	≤0.015	≤0.012	65,1-71,2	26-29	≤0.7	2.8 - 3.5	≤0.8	≤0.03	≤0.1

Steel is melted in an open induction furnace or use the method of electroslag remelting - a method of obtaining metal by remelting in a bath of conductive slag under the influence of an electric current. This method considerably increases the quality of the alloys. The pipe is manufactured in accordance with GOST 12 766.477 and 5632-72. Hot forging is carried out at t ° 1150 ° C at the beginning and 900 ° C at the end of the process. After forging is recommended air or water hardening at 1100-1200 ° C. Weldability is limited. Preheating to about 200°C and a final heat treatment is necessary.

t°	E 10-⁵	a 10 ⁶	Heat capacity	Density
Grad	MPa	1/Grad	W/(m-grad)	^g/cm3
20	1.91	11.7	7,9
200	1.73	13.86	13.9
400	1.56	15.68	17.25	7,76
600	1.37	17.81	18.9
800	25.47	24.8	7,59
1000	21.21

Use

Fabrication of fragments of gas piping systems whose operation takes place under moderate stress. This alloy is heat-resistant and heat-resistant, but unstable in sulfur-containing environments. CrN70U tube can be operated for a long time at temperatures up to 800 ° C, although it can withstand short-term elevation t ° up to 1200 ° C, but even greater heating causes the process of active formation of scale. The alloy is also used in the manufacture of heating elements and welding wires for surfacing parts and welding steel structures in mechanical engineering. This steel can be used to produce parts for afterburner chambers - additional combustion chambers for turbojet engines designed to temporarily increase thrust, and combustion chambers that operate under low stress at a temperature of 1100-1200°C. When heated, chromium and aluminum in the alloy composition actively form oxide films, which increases the resistance of the material to the corrosive environment. In addition to gas pipe systems CrN70U tube can be used for drainage, construction of industrial building structures.

Buy at optimal price

At the warehouse of Evek GmbH a wide range of products of the brand CHN70Yu standard and non-standard parameters. Prices are conditioned by the technological features of production without the inclusion of additional costs. The terms of realization of the orders are minimal. Wholesale customers receive discounts.