A20

Substitute: A12.

Carbon Sulfur Steel

Small parts of machines and appliances, lightly loaded parts of complex configuration, which are requirements of high dimensional accuracy and surface quality after carburizing and cyanide — lightly loaded parts, which are requirements of high wear resistance and surface quality.

Classification

Country	Section	Category
Country	Section	Category
CIS, Russia, Ukraine	Structural steel	Improved machinability structural steel

Chemical composition

Standard	Fe, %	Si, %	Mn, %	Cu, %	P, %	C, %	S, %
Standard	Fe, %	Si, %	Mn, %	Cu, %	P, %	C, %	S, %
GOST 1414-75	97.94–98.9	0.15–0.35	0.7–1	< 0.25	< 0.06	0.17–0.25	0.08–0.15

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Physical characteristics

Temperature, °C	$\rho$ , $\frac{kg}{m^3}$
Temperature, °C	$\rho$ , $\frac{kg}{m^3}$
20	7840

Mechanical properties at 20 °C

Rolling	Standard	Size, mm	Tension	Classifiers	$\sigma _{U}$ , $MPa$	$\psi$ , %	d5, %	Treatment
Rolling	Standard	Size, mm	Tension	Classifiers	$\sigma _{U}$ , $MPa$	$\psi$ , %	d5, %	Treatment
Rental hot rolled.	GOST 1414-75			hot rolling	450	30	20
Rental calibrated. Hardened.	GOST 1414-75			calibrated, cold-work	530		7

Brinell hardness number

Rolling	Standard	Classifiers	Value, HBW
Rolling	Standard	Classifiers	Value, HBW
Rental hot rolled.	GOST 1414-75	hot rolling	168
Rental calibrated. Hardened.	GOST 1414-75	calibrated, cold-work	217

Technological Properties

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

Critical point temperatures

Ac₁, K	Ac₃(Ac_m), K	Ar₃(Arc_m), K	Ar₁, K
Ac₁, K	Ac₃(Ac_m), K	Ar₃(Arc_m), K	Ar₁, K
735	866	840	685

Analogues

USA	Germany	Bulgaria
USA	Germany	Bulgaria
1120	22SPb20	А20

Standards

Standard	Description
Standard	Description
GOST 1414-75

Description of chemical elements

Element	Units of measurement	Description
Element	Units of measurement	Description
Fe	%	Iron
Si	%	Silicon
Mn	%	Manganese
Cu	%	Copper
P	%	Phosphorus
C	%	Carbon
S	%	Sulfur

Description of physical characteristics

Parameter	Units of measurement	Description
Parameter	Units of measurement	Description
$\rho$	$\frac{kg}{m^3}$	The density of the material

Description of mechanical properties

Parameter	Units of measurement	Description
Parameter	Units of measurement	Description
d5	%	Elongation at break
$\sigma _{U}$	$MPa$	Ultimate tensile strength
$\psi$	%	Reduction in cross section on fracture

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
Ar₃(Arc_m)	K
Ar₁	K