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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

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