70g

Springs of mechanisms and machines.

Classification

Country	Section	Category
Country	Section	Category
CIS, Russia, Ukraine	Structural steel	Spring-spring structural steel

Chemical composition

Standard	Fe, %	Si, %	Mn, %	Cr, %	Cu, %	Ni, %	P, %	C, %	S, %
Standard	Fe, %	Si, %	Mn, %	Cr, %	Cu, %	Ni, %	P, %	C, %	S, %
GOST 14959-79	96.91–98.26	0.17–0.37	0.9–1.2	< 0.25	< 0.2	< 0.25	< 0.035	0.67–0.75	< 0.035

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Mechanical properties at 20 °C

Rolling	Standard	Size, mm	Tension	Classifiers	$\sigma _{U}$ , $MPa$	$\sigma_{P}$ , $MPa$	$\psi$ , %	d5, %	Treatment
Rolling	Standard	Size, mm	Tension	Classifiers	$\sigma _{U}$ , $MPa$	$\sigma_{P}$ , $MPa$	$\psi$ , %	d5, %	Treatment
Rod	GOST 14959-79	< 80			1030	834	25	7	Tempering 830 ° C, oil, leave 470 ° C
The plates	GOST 1577-93			fat	780			10
The tape is annealed.	GOST 2283-79			annealing	640–740			10–15
The tape is hardcore.	GOST 2283-79			cold-work	740–1180

Brinell hardness number

Rolling	Standard	Classifiers	Value, HBW
Rolling	Standard	Classifiers	Value, HBW
Hire	GOST 14959-79	heat-treated	285
Hire	GOST 14959-79	raw	241
Sheet	GOST 1577-93	annealing, fat	229

Analogues

USA	Germany
USA	Germany
G15720	1.1259 (80Mn4)

Standards

Standard	Description
Standard	Description
GOST 14959-79

Description of chemical elements

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

Description of mechanical properties

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