EP648-VI (HN50VMTYUB-VI)

Classification

Country	Section	Category
Country	Section	Category
CIS, Russia, Ukraine	Corrosion-resistant alloys and steels	Corrosion-resistant heat-resistant steel

Chemical composition

Standard	Fe, %	Si, %	B, %	Mn, %	Cr, %	Ti, %	Ni, %	Al, %	Ce, %	P, %	C, %	S, %	Nb, %	Mo, %	W, %
Standard	Fe, %	Si, %	B, %	Mn, %	Cr, %	Ti, %	Ni, %	Al, %	Ce, %	P, %	C, %	S, %	Nb, %	Mo, %	W, %
TU 14-1-1052-74	< 4	< 0.4	< 0.008	< 0.5	32–35	0.5–1.1	48.037–59.9	0.5–1.1	< 0.03	< 0.015	< 0.1	< 0.01	0.5–1.1	2.3–3.3	4.3–5.3

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Physical characteristics

Temperature, °C	$\alpha\cdot 10^{6}$ , $K^{-1}$	$\varkappa$ , $\frac{W}{m\cdot K}$	$\rho$ , $\frac{kg}{m^3}$	Cp, Дж/кг·К
Temperature, °C	$\alpha\cdot 10^{6}$ , $K^{-1}$	$\varkappa$ , $\frac{W}{m\cdot K}$	$\rho$ , $\frac{kg}{m^3}$	Cp, Дж/кг·К
20	11.1–17.1	55–65	8050	456

Mechanical properties at 20 °C

Rolling	Standard	Size, mm	Tension	Classifiers	$\sigma _{U}$ , $MPa$	$\sigma_{Y}$ , $MPa$	d5, %	Treatment
Rolling	Standard	Size, mm	Tension	Classifiers	$\sigma _{U}$ , $MPa$	$\sigma_{Y}$ , $MPa$	d5, %	Treatment
Round	TU 14-1-1072-74	40	Transverse	raw, hot rolling, fat, Transverse	1000–1050	600–650	30–35

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Rolling	Standard	Classifiers	Value, HRC
Rolling	Standard	Classifiers	Value, HRC
Round	TU 14-1-1072-74	raw, hot rolling, fat, Transverse	42–47

Technological Properties

Weldability	Flake Susceptibility	Propensity to temper brittleness
Weldability	Flake Susceptibility	Propensity to temper brittleness
Boundedly welded	insensitive	loathsome

Heat Treatment Modes

Treatment
Treatment
Heating up to 1130-1150 ° С (holding for 1 hour), cooling in air + Aging at 880-920 ° С (holding for 16 hours), cooling in air

Standards

Standard	Description
Standard	Description
TU 14-1-1052-74
TU 14-1-1072-74
TU 14-1-1213-75
TU 14-1-1530-75
TU 14-1-2234-77
TU 14-1-3046-80
TU 14-131-765-89

Description of chemical elements

Element	Units of measurement	Description
Element	Units of measurement	Description
Fe	%	Iron
Si	%	Silicon
B	%	Bor
Mn	%	Manganese
Cr	%	Chrome
Ti	%	Titan
Ni	%	Nickel
Al	%	Aluminium
Ce	%	Cerium
P	%	Phosphorus
C	%	Carbon
S	%	Sulfur
Nb	%	Niobium
Mo	%	Molybdenum
W	%	Tungsten

Description of physical characteristics

Parameter	Units of measurement	Description
Parameter	Units of measurement	Description
Cp	Дж/кг·К	Specific heat of material
$\alpha\cdot 10^{6}$	$K^{-1}$	Coefficient of thermal (linear) expansion (range 20°C–T)
$\varkappa$	$\frac{W}{m\cdot K}$	Coefficient of thermal conductivity (the heat capacity of the material)
$\rho$	$\frac{kg}{m^3}$	The density of the material

Description of mechanical properties

Parameter	Units of measurement	Description
Parameter	Units of measurement	Description
d5	%	Elongation at break
$\sigma_{Y}$	$MPa$	Yield strength
$\sigma _{U}$	$MPa$	Ultimate tensile strength

Designation of types of weldability

Parameter	Units of measurement	Description
Parameter	Units of measurement	Description
no limits		Welding is performed without heating and without subsequent heat treatment
Boundedly welded		Welding is possible with heating up to 100–120 °C and subsequent heat treatment
Difficult to weld		For obtaining quality welded joints, additional operations are required: heating up to 200–300 °C for welding, heat treatment after welding — annealing
Not applicable for welded structures