U7A (U7)

For a tool that works in conditions that do not cause heating of the working edge: chisels, chisels, hammers, axes, milling cutters, screwdrivers. Not applicable for welded structures.

a tool that works in conditions that do not cause heating of the working edge: chisels, chisels, barbs, hammers, blades of scissors for cutting metal, Axes, chisels, combination pliers, a sledgehammer.

Classification

Country	Section	Category
CIS, Russia, Ukraine	Tool steel	Carbon Tool Steel

Chemical composition

Standard	Fe, %	Si, %	Mn, %	Cr, %	Cu, %	Ni, %	P, %	C, %	S, %
GOST 1435-99	97.907–99.01	0.17–0.33	0.17–0.28	< 0.2	< 0.25	< 0.25	< 0.025	0.65–0.74	< 0.018

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Physical characteristics

Temperature, °C	$$\rho$$, $$\frac{kg}{m^3}$$	$$R\cdot 10^{-6}$$, $$\Omega\cdot m$$
20	7830	0.13

Mechanical properties at 20 °C

Rolling	Standard	Size, mm	Tension	Classifiers	$$\sigma _{U}$$, $$MPa$$	$$\epsilon_L$$, %	Treatment
Tape				cold-work	740–1180
Tape				annealing	640–740	10–15

Brinell hardness number

Rolling	Standard	Classifiers	Value, HBW
Alloy	GOST 1435-99	annealing	1870

Technological Properties

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

Critical point temperatures

Ac₁, K	Ac₃(Ac_m), K	Ar₁, K	Mn, K
730	770	700	280

Analogues

Germany	France	European Union	Italy	China	Bulgaria	Hungary	Poland	Romania	Czech Republic
1.1520 (C70U)	C70E2U	CT70	C70KU	T7A	C70U	S71	N7E	OSC7	19132

Standards

Standard	Description
GOST 1435-99

Description of chemical elements

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 physical characteristics

Parameter	Units of measurement	Description
$$\rho$$	$$\frac{kg}{m^3}$$	The density of the material
$$R\cdot 10^{-6}$$	$$\Omega\cdot m$$	Electrical resistivity

Description of mechanical properties

Parameter	Units of measurement	Description
$$\sigma _{U}$$	$$MPa$$	Ultimate tensile strength
$$\epsilon_L$$	%	Elongation at break (longitudinal)

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

Description of temperatures of critical points

Parameter	Units of measurement	Description
Ac₁	K
Ac₃(Ac_m)	K
Ar₁	K
Mn	K