1.5026 (55Si7)

Classification

Country	Section	Category
Germany	Structural, Pressure Vessel and Engineering Steels	Mn-Si-Cu

Chemical composition

Standard	Fe, %	Si, %	Mn, %	Cr, %	Ni, %	P, %	C, %	S, %	Mo, %
EN 10089	95.55–97.28	1.6–2	0.6–0.9	< 0.4	< 0.4	< 0.025	0.52–0.6	< 0.025	< 0.1

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Mechanical properties at 20 °C

Rolling	Standard	Size, mm	Tension	Classifiers	$$\sigma _{U}$$, $$MPa$$	$$\sigma_{0.2}$$, $$MPa$$	$$\epsilon_{L (L_0 = 80 mm)}$$, %	Treatment
		0.3–3		annealing, soft	740	600	12
		0.3–3		moderate hardening	1200–1700

Твёрдость по Викерсу

Rolling	Standard	Classifiers	Value, HV
		annealing, soft	230
		moderate hardening	370–520

Brinell hardness number

Rolling	Standard	Classifiers	Value, HBW
		improved machinability	280
		annealing, soft	248
		annealing, carbide spheroidization	230

Analogues

CIS, Russia, Ukraine
55S2
55S2A

Standards

Standard	Description
EN 10089

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
$$\sigma_{0.2}$$	$$MPa$$	Tensile stress required to produce a total elongation of 0.2%
$$\sigma _{U}$$	$$MPa$$	Ultimate tensile strength
$$\epsilon_{L (L_0 = 80 mm)}$$	%	Elongation at break (longitudinal) (for L₀ = 80 mm)