Steel U9
Designation
| Name |
The value |
| Designation GOST Cyrillic |
У9 |
| Designation GOST Latin |
U9 |
| Transliteration |
U9 |
| The chemical elements |
9 |
Description
Steel U9 is used: for the manufacture of tools, working in conditions without heating of cutting edge; the tool for tree processing (milling cutters, countersinks, zekovic, axes, chisels, chisels, longitudinal, and circular saws; rollers, plates and rods for mold molding tin-swinomish alloys; calibers simple form and low accuracy classes; cold-rolled heat-treated ribbon with a thickness of from 2.5 to 0.02 mm, intended for manufacturing of flat and wire springs and spring-loaded parts of complex configuration (valves, styli, reeds, slats dolnych knives structural fine details, including hours, etc. (tape is produced according to GOST 2283, GOST 21996 and a number of special technical conditions).
Standards
| Name |
Code |
Standards |
| Tapes |
В34 |
GOST 10234-77 |
| Sheets and stripes |
В23 |
GOST 103-2006 |
| Sectional and shaped rolling |
В22 |
GOST 1133-71, GOST 2590-2006, GOST 2591-2006, GOST 2879-2006 |
| Sectional and shaped rolling |
В32 |
GOST 1435-99, GOST 7417-75, GOST 8559-75, GOST 8560-78, GOST 14955-77, TU 14-11-245-88, TU 14-1-1271-75 |
| Sheets and stripes |
В33 |
GOST 4405-75, TU 14-131-971-2001 |
| Steel wire medium- and high-carbon |
В72 |
GOST 5468-88, GOST 9389-75 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
| GOST 1435-99 |
0.85-0.94 |
≤0.028 |
≤0.03 |
0.17-0.33 |
≤0.2 |
0.17-0.33 |
≤0.025 |
The rest |
≤0.025 |
Fe is the basis.
According to GOST 1435-99, the mass fraction of chromium, nickel and copper is indicated for 1 group of metal products. The mass fraction of sulfur in steel obtained by the electroslag remelting method should not exceed 0.013%. In the metal products of the third group, the mass fraction of Cr ≤ 0.20-0.40%, Ni ≤ 0.25%, Cu ≤0.25%. In metal products of the 1 st and 3 rd groups, made of steel obtained by scrap-process, the mass fractions of nickel, copper and chromium are increased by 0.05% of each element as compared to those in the table. In a metal designed for the manufacture of cold-rolled strip, an increase in the mass fraction of nickel, copper and chromium is not allowed.
Mechanical characteristics
| Section, mm |
σB, MPa |
d4 |
d |
| Tape flatted average strength of 0.1-4.0 mm according to GOST 10234-77 in the state of delivery (indicated delivery) |
| - |
740-1270 |
- |
- |
| - |
≤780 |
- |
≥8 |
| Annealed cold-rolled tape of the highest quality |
| 4 |
≤750 |
≥10 |
- |
| Cold-rolled steel strip sagatovna (specified strength class) |
| 0.1-4 |
750-900 |
- |
- |
| 0.1-4 |
900-1050 |
- |
- |
| 0.1-4 |
1050-1200 |
- |
- |
Description mechanical marks
| Name |
Description |
| Section |
Section |
| σB |
Limit short-term strength |
| d4 |
Elongation after rupture |
| d |
Elongation after rupture |
Physical characteristics
| Temperature |
Е, ГПа |
G, ГПа |
r, кг/м3 |
l, Вт/(м · °С) |
R, НОм · м |
a, 10-6 1/°С |
| 0 |
207 |
79 |
7745 |
- |
- |
- |
| 20 |
207 |
- |
7745 |
- |
- |
- |
| 100 |
- |
- |
7726 |
49 |
253 |
113 |
| 200 |
- |
- |
7717 |
48 |
329 |
121 |
| 300 |
- |
- |
7690 |
46 |
418 |
129 |
| 400 |
- |
- |
7686 |
43 |
525 |
136 |
| 500 |
- |
- |
7655 |
40 |
646 |
142 |
| 600 |
- |
- |
7622 |
37 |
789 |
147 |
| 700 |
- |
- |
7586 |
33 |
943 |
152 |
| 800 |
- |
- |
7568 |
- |
1155 |
152 |
| 900 |
- |
- |
7523 |
- |
1198 |
- |
| 1000 |
- |
- |
- |
- |
- |
14 |
A description of the physical symbols
| Name |
Description |
| Е |
The normal elasticity modulus |
| l |
Coefficient of thermal conductivity |
| a |
The coefficient of linear expansion |
| С |
Specific heat |
Technological properties
| Name |
The value |
| Weldability |
does not apply to welded structures. |
| Propensity to temper brittleness |
tend not |
| Forging temperature |
Start - 1125 °C, the end - 750 °C. |
| Flock-sensitive sensitivity |
not sensitive |
