Alloy CR20NI80-H

Designation

Name	The value
Designation GOST Cyrillic	Х20Н80-Н
Designation GOST Latin	X20H80-H
Transliteration	H20N80-N
By chemical elements	Cr20Ni80-Ni

Description

Alloy CR20NI80-H is used: for the manufacture of electric heating elements in industrial furnaces and various electric heating devices with maximum operating temperatures up to +1200 °C, and appliances; rolled strip 0.1−1.0 mm for the manufacture of heating elements and resistance elements.

Note

The heat resisting alloy in an oxidizing atmosphere, in nitrogen, ammonia, unstable in the atmosphere containing sulfur and sulfur compounds, more heat resistant than zhelezomargantsevye alloys.

Standards

Name	Code	Standards
Classification, nomenclature and General rules	В30	GOST 10994-74
Wire, steel, alloy	В73	GOST 12766.1-90, OST 88.0.022.202-74, TU 14-173-142-88
Tape	В34	GOST 12766.2-90, GOST 12766.5-90, GOST 12766-67
Bars and shapes	В32	GOST 12766.3-90, GOST 12766.4-90, TU 14-11-245-88
Blanks. Of the workpiece. Slabs	В31	TU 14-1-3904-84

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	Al	Ti	Zr
GOST 10994-74	≤0.06	≤0.015	≤0.02	≤0.6	20-23	1-1.5	Rest	≤1	≤0.2	≤0.2	0.2-0.5
GOST 12766-67	≤0.1	≤0.02	≤0.03	≤0.6	20-23	1-1.5	Rest	≤1.2	≤0.2	≤0.2	≤0.5

Ni is the basis.
In accordance with the requirements of GOST 10994-74, the alloy must be smelted in induction furnaces.
According to GOST 12766-67 the chemical composition is given for the alloy grade Kh20N80-N. 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	σ_U, MPa	d₅, %	d	y, %	HB, MPa
Wire cold-drawn heat-treated in the delivery condition according to GOST 12766.1-90 (the value is δ200)
	≤880	-	≥20	-	-
Wire cross section of 0.1-7.5 mm. heated to 1200 °C (exposure: 20 min), air cooling
-	≥656	≥45	-	≥61	-
Wire. Heating up to 1200 °C (exposure: 20 min), air cooling
0.1-7.5	≥656	≥45	-	≥61	140-150
Wire cross section of 0.1-7.5 mm. heated to 1200 °C (exposure: 20 min), air cooling
-	≥431	≥40	-	≥40	-
-	≥215	≥70	-	≥72	-
-	≥92	≥55	-	≥82	-
-	≥71	≥70	-	≥62	-
-	≥35	≥130	-	≥93	-
-	≥27	≥110	-	≥96	-
-	≥22	≥102	-	≥98	-

Description mechanical marks

Name	Description
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	Е, HPa	r, kg/m³	l, W/(m · °C)	R, Mr. · m	a, 10^-6 1/°C	С, J/(kg · °C)
20	217	8400	-	1175	-	440
100	-	-	14	1180	-	-
200	-	-	16	1190	-	-
300	-	-	17	1200	-	-
400	-	-	19	1215	-	-
600	-	-	23	1200	-	-
500	-	-	-	1220	-	-
700	-	-	-	1195	-	-
800	-	-	-	1195	-	-
900	-	-	-	1200	-	-
1000	-	-	-	-	163	-

A description of the physical symbols

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

Technological properties

Name	The value
Weldability	RDS. Gas welding does not apply.
Microstructure	Austenitic structure.
Magnitnoi	Non-magnetic alloy.
Okalinolomatel, heat resistance	Onlinetony alloy in an oxidizing atmosphere, hydrogen, vacuum; unstable in an atmosphere containing sulfur and sulfur compounds; more heat resistant than homoalanine alloys.
Operating temperature	The working temperature of heating element: Optimal 1150 °C, the limit of 1200 °C. maximum recommended operating temperature of the heating element from 950 °C at a thickness of 0.2 mm to 1200 °C thickness ≥ 6.0 mm.
Survivability	Survivability at a temperature of 1150 °C for at least 160 hours.