Steel U8G
Designation
| Name |
The value |
| Designation GOST Cyrillic |
У8Г |
| Designation GOST Latin |
U8G |
| Transliteration |
U8G |
| The chemical elements |
8Mn |
Description
U8G steel 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); cold strip 0,95х327 mm, intended for the production of saws cotton ginning machines.
Standards
| Name |
Code |
Standards |
| 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 |
| Sheets and stripes |
В33 |
GOST 4405-75, GOST 5497-80 |
| 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 |
0.8-0.9 |
≤0.028 |
≤0.03 |
0.33-0.58 |
≤0.2 |
0.17-0.33 |
≤0.25 |
The rest |
≤0.25 |
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 |
HRB |
| Annealed cold-rolled tape of the highest quality |
| 0.08-3 |
≤750 |
≥10 |
- |
| Cold-rolled steel strip 5 in group 0,95х327 mm in the delivery state (quenching + tempering) according to GOST 5497-80 (specified hardness HRА) |
| 0.95 |
≥1150 |
≥6 |
67-70 |
Description mechanical marks
| Name |
Description |
| Section |
Section |
| σB |
Limit short-term strength |
| d4 |
Elongation after rupture |
| HRB |
Rockwell hardness (indenter steel, spherical) |
