55X

Steel is difficult to weld, prone to temper brittleness, Flock sensitivity: sensitive. Hardness after quenching and tempering: HB 10 ^-1 = 212 — 248 MPa.

axis component supporting rolls for cold rolling of metals. Work rolls blooming, slabbing, billet, rail and structural steel, Large-size, medium-section and small-section mill and working rolls of sheet mills for hot rolling of metals. Geared shafts, gears, and other loaded parts subject to abrasion, but working without any significant shocks.

Classification

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

Chemical composition

Standard	Fe, %	Si, %	Mn, %	Cr, %	Ni, %	P, %	C, %	S, %
OST 24.013.20 - 0	96.5–97.98	0.17–0.37	0.35–0.65	1–1.3	< 0.5	< 0.04	0.5–0.6	< 0.04

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Mechanical properties at 20 °C

Rolling	Standard	Size, mm	Tension	Classifiers	$$\sigma _{U}$$, $$MPa$$	$$\sigma_{P}$$, $$MPa$$	$$\epsilon_L$$, %	$$\psi$$, %	Treatment
Forgings		100–300			780	540	10	35	Tempering 820-840 ° C, oil, Holidays 560-630 ° C, the furnace

Brinell hardness number

Rolling	Standard	Classifiers	Value, HBW
Alloy		Hardening, average vacation	212–248

Technological Properties

Weldability	Flake Susceptibility	Propensity to temper brittleness
Difficult to weld	sensitive	inclined

Standards

Standard	Description
OST 24.013.20 - 0

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

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

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