U8

Steel is not used for welded structures, not inclined. to temper embrittlement. Flock sensitivity: not sensitive. The temperature of the critical points of the alloy: Ac1 = 720, Ar1 = 700, Mn = 245. Hardness after annealing (GOST 1435−99): HB 10 -1 = 187 MPa / Substitute U7, U10.

tool, working in conditions that do not cause heating of the cutting edge: cutters, countersinks, axes, chisels, chisels, saws longitudinal and circular, rolling rolls, center punches, screwdriver, combined pliers, side cutters.

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	97.742–98.91	0.17–0.33	0.17–0.33	< 0.2	< 0.25	< 0.25	< 0.03	0.75–0.84	< 0.028

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Physical characteristics

Temperature, °C	$$E\cdot 10^{9}$$, $$MPa$$	$$\alpha\cdot 10^{6}$$, $$K^{-1}$$	$$\varkappa$$, $$\frac{W}{m\cdot K}$$	$$\rho$$, $$\frac{kg}{m^3}$$	$$c\cdot 10^{-3}$$, $$\frac{J}{kg\cdot K}$$	$$R\cdot 10^{-6}$$, $$\Omega\cdot m$$
20	209			7839
100	205	11.4	49	7817	0.477	0.23
200	199	12.2	46	7786	0.511	0.305
300	192	13	42	7752	0.528	0.395
400	185	13.7	38	7714	0.548	0.491
500	175	14.3	35	7676	0.565	0.625
600	166	14.8	33	7638	0.594	0.769
700		15.2	30	7600	0.624	0.931
800		14.5	24	7852	0.724	1.129
900						1.165

Mechanical properties at 20 °C

Rolling	Standard	Size, mm	Tension	Classifiers	$$\sigma _{U}$$, $$MPa$$	$$\sigma_{P}$$, $$MPa$$	$$\epsilon_L$$, %	$$\psi$$, %	Treatment
Workpiece		6			1420	1230	10	37	Tempering 780 ° C, oil, leave 400 ° C
Tape		1.5		annealing	750		10

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	Ar₁, K	Mn, K
720	700	245

Analogues

USA	Germany	Japan	France	United Kingdom	European Union	Italy	China	Poland	Czech Republic	Austria
W1-7	1.1625 (C80W2)	SK5	C90E2U	BW1A	CT80	C80KU	T8	N8	19152	K980

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
$$E\cdot 10^{9}$$	$$MPa$$	Elastic modulus
$$\alpha\cdot 10^{6}$$	$$K^{-1}$$	Coefficient of thermal (linear) expansion (range 20°C–T)
$$\varkappa$$	$$\frac{W}{m\cdot K}$$	Coefficient of thermal conductivity (the heat capacity of the material)
$$\rho$$	$$\frac{kg}{m^3}$$	The density of the material
$$c\cdot 10^{-3}$$	$$\frac{J}{kg\cdot K}$$	The specific heat of the material (range 20°C–T)
$$R\cdot 10^{-6}$$	$$\Omega\cdot m$$	Electrical resistivity

Description of mechanical properties

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

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
Ar₁	K
Mn	K