1.1203 (C55E)

Classification

Country	Section	Category
Country	Section	Category
Germany	Non-alloy Special Steels	Structural Pressure Vessel and Engineering Steels with C > = 0,5%

Chemical composition

Standard	Fe, %	Si, %	Mn, %	Cr, %	Ni, %	P, %	C, %	S, %	Mo, %
Standard	Fe, %	Si, %	Mn, %	Cr, %	Ni, %	P, %	C, %	S, %	Mo, %
EN 10083-1	97.135–98.88	< 0.4	0.6–0.9	< 0.4	< 0.4	< 0.03	0.52–0.6	< 0.035	< 0.1

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Mechanical properties at 20 °C

Rolling	Standard	Size, mm	Tension	Classifiers	$\sigma _{U}$ , $MPa$	$\sigma_{0.2}$ , $MPa$	$\epsilon_{L (L_0 = 80 mm)}$ , %	$\epsilon_{L (L_0 = 5.65\sqrt{S_o})}$ , %	$R_{eH}$ , $MPa$	Treatment
Rolling	Standard	Size, mm	Tension	Classifiers	$\sigma _{U}$ , $MPa$	$\sigma_{0.2}$ , $MPa$	$\epsilon_{L (L_0 = 80 mm)}$ , %	$\epsilon_{L (L_0 = 5.65\sqrt{S_o})}$ , %	$R_{eH}$ , $MPa$	Treatment
		< 16		normalization	680			11	370
		16–100		normalization	640			12	330
		100–250		normalization	620			12	300
		250–500		normalization	600				260
		500–1000		normalization	590				250
		0.3–3		annealing, soft	600	480	17
		0.3–3		moderate hardening	1100–1700

Brinell hardness number

Rolling	Standard	Classifiers	Value, HBW
Rolling	Standard	Classifiers	Value, HBW
		improved machinability	255
		annealing, soft	229

Твёрдость по Викерсу

Rolling	Standard	Classifiers	Value, HV
Rolling	Standard	Classifiers	Value, HV
		annealing, soft	185
		cold rolling	300
		moderate hardening	340–520

Standards

Standard	Description
Standard	Description
EN 10083-1

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
$\sigma_{0.2}$	$MPa$	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)
$\epsilon_{L (L_0 = 5.65\sqrt{S_o})}$	%	Elongation at break (longitudinal) (for L₀ = 5.65√So)
$R_{eH}$	$MPa$	Upper yield point