Alloy ХН40МДТЮ (ЭП543У)

Designation

Name	The value
Designation GOST Cyrillic	ХН40МДТЮ
Designation GOST Latin	XH40MDTJu
Transliteration	HN40MDTYu
By chemical elements	CrNi40CuДTeAl

Name	The value
Designation GOST Cyrillic	ЭП543У
Designation GOST Latin	EP543U
Transliteration	EhP543U
By chemical elements	-

Description

Alloy ХН40МДТЮ used: for the manufacture of various chemical equipment (centrifugal separators, centrifuges) that are exposed to the corrosive environment; elastic sensing elements (membranes, bellows, springs) working in highly-corrosive environments at elevated temperatures; various parts and equipment of chemical and petroleum engineering.

Note

Alloy corrosion resistant high strength dispersion-hardened iron-on basis.

Standards

Name	Code	Standards
Processing of metals by pressure. Forgings	В03	TU 14-1-1754-76
Bars and shapes	В32	TU 14-1-4042-85

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	Cu	Al	Ti	Mo
TU 14-1-4042-85	≤0.04	≤0.02	≤0.035	≤0.8	14-17	≤0.5	39-42	Rest	2.7-3.3	0.7-1.2	2.5-3.2	4.5-6
TU 14-1-1754-76	≤0.04	≤0.02	≤0.035	≤0.8	14-17	≤0.8	39-42	Rest	2.7-3.3	0.7-1.2	2.5-3.2	4.5-6

According to TU 14-1-4042-85, the chemical composition is given for an alloy of the brand KhN40MDTU-ID (EP543U-ID). In the finished metal, deviations in chemical composition by carbon + 0,0,010%, copper ± 0,20% are allowed.
According to TU 14-1-1754-76 the chemical composition is given for the alloy grade KhN40MDTU. Deviations in chemical composition are allowed: for carbon + 0.010%, for copper ± 0.20%.

Mechanical properties

Section, mm	s_T\|s_0,2, MPa	σ_U, MPa	d₅, %	y, %	KCU, kJ/m²
Forgings on the other 14-1-1754-76. Annealing in air from 1050-1100 °C (extract of 1.5-2.0 h) + Ageing at 750 °C (extract 5-10 h), air cooling
	≥685	≥880	≥10	≥10	≥390
Rod. Annealing in air 1050 °C + Aging at 650 °With (extract 5-8 hours) (longitudinal samples)
-	≥940	≥1770	≥18	≥13	-
Forgings on the other 14-1-1754-76. Aging at 600-630 °C (excerpt 5-8 hours), air cooling
	≥785	≥980	≥10	≥10	≥390
Rod. Annealing in air 1050 °C + Aging at 650 °With (extract 5-8 hours) (longitudinal samples)
-	≥850	≥1620	≥28	≥26	-
Bars hot rolled and forged on the other 14-1-4042-85. Annealing in air from 1050-1100 °C (extract of 1.5-2.0 h) + Ageing at 750±10 °C (extract 5-10 h), air cooling
	≥685	≥880	≥10	≥10	≥340
Rod. Annealing in air 1050 °C + Aging at 650 °With (extract 5-8 hours) (longitudinal samples)
-	≥720	≥1320	≥32	≥37	-
-	≥720	≥1290	≥31	≥37	-

Description mechanical marks

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
y	The relative narrowing
KCU	Toughness

Physical characteristics

Temperature	Е, HPa	r, kg/m³	a, 10^-6 1/°C
20	208	8050	-
100	-	-	815
200	-	-	110
300	-	-	120
400	-	-	128
500	-	-	136
600	-	-	141
700	-	-	199
800	-	-	162

A description of the physical symbols

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

Technological properties

Name	The value
Weldability	Alloy weld TIG welding using a filler material wire SV-04ХН40МДТЮ. However, a welded joint without the formation of hot cracks can be obtained when the thickness of the welded elements up to 6 mm. Better resistance against the formation of hot cracks in the HAZ of the alloy has after pre-treatment according to the scheme: deformation + low temperature aging (at +650 °C). Contact seam welding in thicknesses of 0.16-0.26 mm with alloys ХН40МДТЮ and ХН28МДТ (ЭП943), as well as to steel type 18CR10NITI provides high-quality weld high vacuum density.
Pressure treatment	The pressure treatment is performed at a 1160-950 °C. If the aging is carried out immediately after hot plastic deformation, the temperature of the end of deformation should be below the recrystallization temperature of the alloy, i.e. below 920 °C.
Features of heat treatment	Softening heat treatment is quenched from 1050-1100 °C in water or air. Depending on the required level of strength recommended by the following modes: 1) Hot plastic deformation + Aging at 600-650 °C (maintained for 5 h), air cooling; 2) Quenching in air, 1050-1100 °C (extract of 1.5-2.0 h) + Aging at 650-750 °C (extract 5-10 h), air cooling.
Corrosion resistance	The alloy has high corrosion resistance in solutions of sulfuric and phosphoric acids, in gas condensate environments containing elevated levels of hydrogen sulfide and carbon dioxide. Alloy (regardless of the mode of heat treatment and deformation) has a high resistance against General corrosion in solutions of sulfuric acid concentration to 60 % at temperatures up to +80 °C, while the minimum resistance of 0.15-0.20 mm/year corresponds to the concentration of sulfuric acid 20-30 %. In solutions of phosphoric acid at a concentration of 70% and temperatures up to +80 °C the corrosion rate of the alloy is not greater than 0.05 mm/year. The alloy can be used in a polyphosphoric acid concentration of 110-115 % at elevated temperature (corrosion rate at +135 °C in the gas phase is less than 0,0007 mm/year; liquid - 0.15 mm/year); 10 % hydrofluoric acid at 70 °C the corrosion rate of 0.11 mm/year. The alloy used for equipment of gas condensate fields with the content in natural gas of hydrogen sulphide up to 6% and carbon dioxide to 6 %. The corrosion rate of alloy in the distillate, saturated with hydrogen sulfide at temperatures up to +70 °C and pressures up to 1.7 N/mm2 not more than 0.0003 mm/year. The alloy is not prone to stress corrosion cracking in boiling 42 % magnesium chloride solution at voltages equal to 0,75 and 1,2 σт; 0,92 σв and technological solutions of the oxygen compounds of chlorine containing 200 g/l NaCl + oxidizer at +90 °C.