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 |
$$\sigma _{U}$$, $$MPa$$ |
$$\epsilon_L$$, % |
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
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 |
| $$\sigma _{U}$$ |
$$MPa$$ |
Ultimate tensile strength |
| $$\epsilon_L$$ |
% |
Elongation at break (longitudinal) |
Description of temperatures of critical points
| Parameter |
Units of measurement |
Description |
| Ac1 |
K |
|
| Ac3(Acm) |
K |
|
| Ar1 |
K |
|
| Mn |
K |
|