34HN1M (34HN1MA)

wheels, wali, turbine rotors and compressor machines, excavators shaft, axles, clutches, gears, coupling halves, pinion shafts, bolts, silo-tions studs and other special responsibility highly loaded parts, which predyavlyat high demands on the mechanical properties and operating temperature to 500 ° C

Classification

Country	Section	Category
CIS, Russia, Ukraine	Structural steel	Alloyed structural steel

Chemical composition

Standard	Fe, %	Si, %	Mn, %	Cr, %	Ni, %	P, %	C, %	S, %	Mo, %
TU 24-1-12-179-75	94.665–96.23	0.17–0.37	0.5–0.8	1.3–1.7	1.3–1.7	< 0.03	0.3–0.4	< 0.035	0.2–0.3

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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
Round		300–500			570	315	12	30	290	Hardening and tempering

Brinell hardness number

Rolling	Standard	Classifiers	Value, HBW
Alloy		normalization	187–229

Technological Properties

Weldability	Flake Susceptibility	Propensity to temper brittleness
Boundedly welded	sensitive	loathsome

Critical point temperatures

Ac₁, K	Ac₃(Ac_m), K	Mn, K
730	780	320

Analogues

Germany	USA
Almenit 6582	MIL S-5000 (G 43400)

Standards

Standard	Description
TU 24-1-12-179-75

Description of chemical elements

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
$$\sigma _{U}$$	$$MPa$$	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
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
Ac₁	K
Ac₃(Ac_m)	K
Mn	K