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Steel U7

U16 steel (EI336) U9A steel U9 steel U8GA steel U8G steel U8A steel U8 steel U7A steel U7 steel U12A steel U12 steel U11A steel (U11) U10A steel U10 steel Steel AU10E (ASU10E) A85 steel Steel A75 (U7AB)

Designation

Name The value
Designation GOST Cyrillic У7
Designation GOST Latin U7
Transliteration U7
The chemical elements 7

Description

Steel u7 is used: for the manufacture of tools for working wood (axes, kolunov, chisels, bits); pneumatic tools small size (chisels, swages, dies); forging dies; needle wire; machinist’s tools (hammers, sledge hammers, drifts, screwdrivers, compound pliers, nippers, oblique cutting pliers, etc.).

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 5210-95, 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
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 0.65-0.74 ≤0.028 ≤0.03 0.17-0.33 ≤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 t отпуска, °C sT|s0,2, MPa σB, MPa d5, % d4 d y, % kJ/m2, кДж/м2 Brinell hardness number, MPa
Tape flatted average strength of 0.1-4.0 mm according to GOST 10234-77 in the state of delivery (indicated delivery)
- - - 780-1270 - - - - - -
- - - 780-930 - - - - - -
- - - 930-1080 - - - - - -
- - - 1080-1230 - - - - - -
- - - ≤780 - - ≥10 - - -
- - - ≤570 - - - - - -
Annealed cold-rolled tape of the highest quality
0.1-1.5 - - ≤650 - ≥15 - - - -
Quenching in fine-grained structure with cooling in water + Vacation
- 300 ≥1370 ≥1590 - - - ≥8 ≥310 -
A sample with a diameter of 5 mm and a length of 25 mm deformed and annealed. A strain rate of 10 mm/min strain Rate 0,007 1/C
- - - ≥105 ≥64 - - ≥90 - -
Annealed cold-rolled tape of the highest quality
1.5-4 - - ≤750 - ≥10 - - - -
Quenching in fine-grained structure with cooling in water + Vacation
- 400 ≥1180 ≥1270 - - - ≥11 ≥440 -
A sample with a diameter of 5 mm and a length of 25 mm deformed and annealed. A strain rate of 10 mm/min strain Rate 0,007 1/C
- - - ≥94 ≥65 - - ≥100 - -
Quenching in fine-grained structure with cooling in water + Vacation
- 500 ≥970 ≥1090 - - - ≥13 ≥730 -
A sample with a diameter of 5 mm and a length of 25 mm deformed and annealed. A strain rate of 10 mm/min strain Rate 0,007 1/C
- - - ≥63 ≥60 - - ≥100 - -
Quenching in fine-grained structure with cooling in water + Vacation
- 600 ≥830 ≥980 - - - ≥17 ≥930 -
A sample with a diameter of 5 mm and a length of 25 mm deformed and annealed. A strain rate of 10 mm/min strain Rate 0,007 1/C
- - - ≥36 ≥62 - - ≥100 - -
- - - ≥22 ≥65 - - ≥100 - -
- - - ≥17 ≥92 - - ≥100 - -
Annealing
- - - - ≥26 - - ≥71 - -
- - - - ≥65 - - ≥99 - -
Cold-rolled steel strip sagatovna (specified strength class)
0.1-4 - - 750-900 - - - - - -
Annealing
- - - - ≥58 - - ≥98 - -
Cold-rolled steel strip sagatovna (specified strength class)
0.1-4 - - 900-1050 - - - - - -
Annealing
- - - - ≥59 - - ≥92 - -
Cold-rolled steel strip sagatovna (specified strength class)
0.1-4 - - 1050-1200 - - - - - -
Annealing
- - - - ≥38 - - ≥71 - -
- - - - ≥45 - - ≥88 - -
Annealing or normalizing
- - - ≤690 ≥16 - - ≥30 - ≤200
- - - ≤660 ≥13 - - ≥22 - ≤200
- - - ≤640 ≥18 - - ≥20 - ≤200
- - - ≤620 ≥22 - - ≥26 - ≤180
- - - ≤460 ≥27 - - ≥34 - ≤155
- - - ≤330 ≥33 - - ≥45 - ≤135
- - - ≤205 ≥38 - - ≥60 - ≤110

Description mechanical marks

Name Description
Section Section
sT|s0,2 Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
σB Limit short-term strength
d5 Elongation after rupture
d4 Elongation after rupture
d Elongation after rupture
y The relative narrowing
kJ/m2 Toughness

Physical characteristics

Temperature r, кг/м3 l, Вт/(м · °С) R, НОм · м С, Дж/(кг · °С)
0 7830 46 130 -
20 7830 46 130 -
100 - 46 - -
300 - 41 - 580
600 - 33 - 970
900 - 29 - 706
400 - - - 664
500 - - - 819
700 - - - 710
800 - - - 706
1100 - - - 685

A description of the physical symbols

Name Description
Е The normal elasticity modulus
G Modulus of elasticity shear torsion
r Density
l Coefficient of thermal conductivity
R UD. the resistivity
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 - 1180 °C, the end - of 800 °C. the cooling of the workpiece cross-section up to 100 mm in the air, 101-300 mm in the pit.
Flock-sensitive sensitivity not sensitive
Workability by cutting In the annealed condition with HB 187 and blower SB=620 MPa Kn TV.SPL.=1.2 Kn b.St.=1.1
Grindability good

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