U9A (U9)

Temperature of critical points of steel U9A: Ac1 = 740, Ac3 (Acm) = 760, Ar1 = 700, Mn = 190. Hardness after annealing (GOST 1435−99): HB 10 -1 = 192 MPa

tool, working in conditions that do not cause heating of the edges: a tool for working wood, hand tools, calibers simple form and the downgrading of accuracy.

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 97.707–98.81 0.17–0.33 0.17–0.28 < 0.2 < 0.25 < 0.25 < 0.025 0.85–0.94 < 0.018

Information on suppliers

Mechanical properties at 20 °C

Rolling Standard Size, mm Tension Classifiers σU, MPa ϵL, % Treatment
Tape 0.08–3 annealing 750 10

Brinell hardness number

Rolling Standard Classifiers Value, HBW
Alloy GOST 1435-99 annealing 192

Critical point temperatures

Ac1, K Ac3(Acm), K Ar1, K Mn, K
740 760 700 190

Analogues

Germany Japan France United Kingdom Italy Bulgaria Hungary Poland
1.1830 (C85W) SK5 C90E2U BW1A C90KU U9A S91 N9E
C85W

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 mechanical properties

Parameter Units of measurement Description
σU MPa Ultimate tensile strength
ϵL % Elongation at break (longitudinal)

Description of temperatures of critical points

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