U12A (U12)

Temperature of the critical points of the alloy U12A: Ac 1 = 730, Ac 3 (Ac m) = 820, Ar 1 = 700, Mn = 200. Hardness У12А after annealing (GOST 1435−99): HB 10 -1 = 217 MPa .

cutting tools, working in conditions that do not cause heating of the cutting edge: Hand taps, Taps machine small-sized, die for Krupp scanning small-sized, Needle, measuring tools of simple shape: smooth gauges, staples.

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 97.357–98.56 0.17–0.33 0.17–0.28 < 0.2 < 0.25 < 0.25 < 0.025 1.1–1.29 < 0.018

Information on suppliers

Physical characteristics

Temperature, °C ρ, kgm3
20 7810

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 217

Critical point temperatures

Ac1, K Ac3(Acm), K Ar1, K Mn, K
730 820 700 200

Analogues

United Kingdom France Italy Bulgaria Hungary Poland Czech Republic Japan
BW1C C120E3U C120KU U12A S121 N12E 19221 SK2

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
ρ kgm3 The density of the material

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