45HNM (45HNMA)

Steel does not apply to welded structures, slightly inclined. to temper embrittlement. Flock sensitivity: sensitive. The temperature of critical points: Ac1 = 750, Ac3 (Acm) = 780. The hardness of normalized steel: HB 10 ^-1 = 197 — 248 MPa. Hardness after quenching and tempering: HB 10 ^-1 = 197 — 262 MPa. Substitute 40XH2MA .

axis component supporting rolls of sheet hot rolling mills for metals and other gear shafts.

Classification

Country	Section	Category
Country	Section	Category
CIS, Russia, Ukraine	Tool steel	Roll tool steel

Chemical composition

Standard	Fe, %	Si, %	Mn, %	Cr, %	Ni, %	P, %	C, %	S, %	Mo, %
Standard	Fe, %	Si, %	Mn, %	Cr, %	Ni, %	P, %	C, %	S, %	Mo, %
OST 24.013.04 - 0	94.65–96.33	0.17–0.37	0.5–0.8	1.3–1.7	1.2–1.6	< 0.04	0.4–0.5	< 0.04	0.1–0.3

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Mechanical properties at 20 °C

Rolling	Standard	Size, mm	Tension	Classifiers	$\sigma _{U}$ , $MPa$	$\sigma_{P}$ , $MPa$	$\epsilon_L$ , %	$\psi$ , %	$KCU\cdot 10^{3}$ , $\frac{J}{m^2}$	Treatment
Rolling	Standard	Size, mm	Tension	Classifiers	$\sigma _{U}$ , $MPa$	$\sigma_{P}$ , $MPa$	$\epsilon_L$ , %	$\psi$ , %	$KCU\cdot 10^{3}$ , $\frac{J}{m^2}$	Treatment
Forgings		100–300			635	440	14	40	540	Normalization

Brinell hardness number

Rolling	Standard	Classifiers	Value, HBW
Rolling	Standard	Classifiers	Value, HBW
Alloy		normalization	197–248
Alloy		Hardening, average vacation	197–262

Technological Properties

Weldability	Flake Susceptibility	Propensity to temper brittleness
Weldability	Flake Susceptibility	Propensity to temper brittleness
Not applicable for welded structures	sensitive	loathsome

Critical point temperatures

Ac₁, K	Ac₃(Ac_m), K
Ac₁, K	Ac₃(Ac_m), K
750	780

Standards

Standard	Description
Standard	Description
OST 24.013.04 - 0

Description of chemical elements

Element	Units of measurement	Description
Element	Units of measurement	Description
Fe	%	Iron
Si	%	Silicon
Mn	%	Manganese
Cr	%	Chrome
Ni	%	Nickel
P	%	Phosphorus
C	%	Carbon
S	%	Sulfur
Mo	%	Molybdenum

Description of mechanical properties

Parameter	Units of measurement	Description
Parameter	Units of measurement	Description
$\sigma _{U}$	$MPa$	Ultimate tensile strength
$\sigma_{P}$	$MPa$	Proportionality limit
$\epsilon_L$	%	Elongation at break (longitudinal)
$\psi$	%	Reduction in cross section on fracture
$KCU\cdot 10^{3}$	$\frac{J}{m^2}$	Impact toughness

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

Description of temperatures of critical points

Parameter	Units of measurement	Description
Parameter	Units of measurement	Description
Ac₁	K
Ac₃(Ac_m)	K