Alloy KH23JU5 (ЭИ595)

Designation

Name	The value
Name	The value
Designation GOST Cyrillic	Х23Ю5
Designation GOST Latin	X23Ju5
Transliteration	H23Yu5
By chemical elements	Cr23Al5

Name	The value
Name	The value
Designation GOST Cyrillic	ЭИ595
Designation GOST Latin	EI595
Transliteration	EhI595
By chemical elements	-

Description

Alloy KH23JU5 used: for the manufacture of wire and strip for industrial and laboratory furnaces, appliances and apparatus, rheostats, and glow plugs; resistive elements; electric heating devices; resistance elements.

Note

The heat resisting alloy in an oxidizing atmosphere containing sulfur and sulfur compounds, working with high-alumina ceramics; prone to sagging at elevated temperatures, can not withstand sudden dynamic loads.

Standards

Name	Code	Standards
Name	Code	Standards
Classification, nomenclature and General rules	В30	GOST 10994-74
Wire, steel, alloy	В73	GOST 12766.1-90, TU 14-1-1380-75, TU 14-131-820-90
Tape	В34	GOST 12766.2-90, GOST 12766-67
Bars and shapes	В32	GOST 12766.3-90, GOST 12766.4-90, TU 14-11-245-88

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	Al	Ti	Ca	Ce	Zr
Standard	C	S	P	Mn	Cr	Si	Ni	Fe	Al	Ti	Ca	Ce	Zr
GOST 10994-74	≤0.05	≤0.015	≤0.02	≤0.3	21.5-23.5	≤0.6	≤0.6	Rest	4.6-5.3	0.15-0.4	≤0.1	≤0.1	0.1
GOST 12766-67	≤0.06	≤0.02	≤0.025	≤0.5	21.5-24.5	≤0.7	≤0.6	Rest	4.5-5.5	≤0.3	-	-	≤0.5

Fe is the basis.
According to GOST 10994-74 the chemical composition is presented for the alloy X23S5. In accordance with GOST 10994-74, the content of calcium and cerium is calculated. When smelting an alloy intended for the production of heating elements, fresh charge materials should be used. Waste of own marks may be used.
According to GOST 12766-67, the chemical composition is given for the alloy grade X23Y5. The presence in the alloy of residual rare-earth elements, as well as barium and calcium, is not a defective feature.

Mechanical properties

Section, mm	s_T\|s_0,2, MPa	σ_U, MPa	d₅, %	d	y, %	HB, MPa
Section, mm	s_T\|s_0,2, MPa	σ_U, MPa	d₅, %	d	y, %	HB, MPa
Cold-rolled steel strip of 0.2-3.2 mm in the delivery state according to GOST 12766.2-90
	-	≤736	≥14	-	-	180-250
The mechanical properties of the alloy at short-term burst tests according to GOST 12766-67. Quenching in water from 760 °C (exposure 30 minutes)
-	≥540	≥647	-	≥23	≥72	-
Wire cold-drawn heat-treated in the delivery condition according to GOST 12766.1-90 (the value is δ200)
	-	≤740	-	≥12	-	-
The mechanical properties of the alloy at short-term burst tests according to GOST 12766-67. Quenching in water from 760 °C (exposure 30 minutes)
-	≥431	≥608	-	≥16	≥53	-
-	≥353	≥373	-	≥30	≥79	-
-	-	≥118	-	≥58	≥94	-
-	-	≥16.67	-	≥122	≥96	-
-	-	≥8.83	-	-	-	-

Description mechanical marks

Name	Description
Name	Description
s_T\|s_0,2	Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
σ_U	Limit short-term strength
d₅	Elongation after rupture
d	Elongation after rupture
y	The relative narrowing
HB	Brinell hardness number

Physical characteristics

Temperature	r, kg/m³	R, Mr. · m	a, 10^-6 1/°C	С, J/(kg · °C)
Temperature	r, kg/m³	R, Mr. · m	a, 10^-6 1/°C	С, J/(kg · °C)
20	7250	1300-1400	-	480
1000	-	-	15	-
1200	-	-	174	-

A description of the physical symbols

Name	Description
Name	Description
Е	The normal elasticity modulus
r	Density
l	Coefficient of thermal conductivity
R	UD. the resistivity
С	Specific heat

Technological properties

Name	The value
Name	The value
Microstructure	Ferritic structure.
Features of heat treatment	After heat treatment of cold drawn wire mode: holding at 750 °C 30 min., cooling with the furnace to 150 °C, 48 h exposure, the value of temperature coefficient of electrical resistance of the AU in the temperature range from 20 to 100 °C is equal to 0,2·10-4 1/°C.
Magnitnoi	Magnetic alloy.
Okalinolomatel, heat resistance	Onlinetony alloy in an oxidizing atmosphere and in the atmosphere containing sulfur and sulfur compounds; is prone to sagging at high temperatures.
Operating temperature	The working temperature of heating element: Optimal 1150 °C, the limit of 1200 °C.
Survivability	Survivability at a temperature of 1250 °C for at least 80 hours.
The survivability of the alloy for heating elements	At least 80 hours at a test temperature of 1250 °C. the recommended maximum operating temperature of the heating element from 950 °C at a thickness of 0.2 mm to 1200 °C thickness ≥ 6.0 mm.