Steel U7A

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	У7А
Designation GOST Latin	U7A
Transliteration	U7A
The chemical elements	7

Description

Steel U7A 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.); cold-rolled heat-treated ribbon with a thickness of 0.05 to 1.30 mm and rolled heat-treated strip thickness 0.15−2.00 mm for the manufacture of spring details and springs, with the exception of the crown; measuring tapes.

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 5210-95, GOST 7417-75, GOST 8559-75, GOST 8560-78, GOST 14955-77, TU 14-1-1910-76, TU 14-1-505-73, TU 14-11-245-88, TU 14-1-1271-75
Tapes	В34	GOST 2283-79, GOST 10234-77, GOST 21996-76, GOST 21997-76, TU 3-939-81, TU 14-1-2993-80
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	≤0.018	≤0.025	0.17-0.28	≤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 2nd group, the mass fraction of Cr ≤ 0.12%, Ni ≤ 0.12%, Cu ≤0.20% and their total mass fraction ≤ 0.40%. 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.
According to TU 14-1-505-73, by agreement of the parties for special purpose hardware, steel should be supplied with reduced content limits of elements without treatment with synthetic slag and purging with argon.
For the tape according to TU 14-1-2993-80 produced in accordance with GOST 2283, the deviation in chromium content is allowed up to +0,020%.

Mechanical characteristics

Section, mm	t отпуска, °C	s_T\|s_0,2, MPa	σ_B, MPa	d₅, %	d₄	d	y, %	kJ/m², кДж/м²	Brinell hardness number, MPa	HV, 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	-	-	-	-	-	-	-
Tape cold-rolled heat-treated (0,05-1,30 mm) for spring parts and springs according to GOST 21996-76 and flattened strip (0,15-2,00 mm) according to GOST 21997-76 (listed group strength tape)
-	-	-	1270-1570	-	-	-	-	-	-	375-485
-	-	-	1580-1860	-	-	-	-	-	-	486-600
-	-	-	≥1860	-	-	-	-	-	-	≥600
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	-	-	-
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	-	-	-
Rolled steel. Quenching in oil from 860 °C to + Vacation at 450 °C
-	-	≥1760	≥1860	≥10	-	-	≥32	≥240	-	-
Cold-rolled steel strip of 0.1-4.0 mm according to GOST 2283-79 on delivery
-	-	-	740-1180	-	-	-	-	-	-	-
-	-	-	≤640	-	≥15	-	-	-	-	-
Rolled steel. Annealing
-	-	-	-	≥26	-	-	≥71	-	-	-
Cold-rolled steel strip of 0.1-4.0 mm according to GOST 2283-79 on delivery
-	-	-	≤740	-	≥10	-	-	-	-	-
Rolled steel. Annealing
-	-	-	-	≥65	-	-	≥99	-	-	-
Cold-rolled steel strip of 0.1-4.0 mm according to GOST 2283-79 on delivery
-	-	-	≤640	-	≥10	-	-	-	-	-
Rolled steel. Annealing
-	-	-	-	≥58	-	-	≥98	-	-	-
Cold-rolled steel strip sagatovna (specified strength class)
0.1-4	-	-	750-900	-	-	-	-	-	-	-
Rolled steel. Annealing
-	-	-	-	≥59	-	-	≥92	-	-	-
Cold-rolled steel strip sagatovna (specified strength class)
0.1-4	-	-	900-1050	-	-	-	-	-	-	-
Rolled steel. Annealing
-	-	-	-	≥38	-	-	≥71	-	-	-
Cold-rolled steel strip sagatovna (specified strength class)
0.1-4	-	-	1050-1200	-	-	-	-	-	-	-
Rolled steel. Annealing
-	-	-	-	≥45	-	-	≥88	-	-	-
Rolled steel. 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
s_T\|s_0,2	Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
σ_B	Limit short-term strength
d₅	Elongation after rupture
d₄	Elongation after rupture
d	Elongation after rupture
y	The relative narrowing
kJ/m²	Toughness
HV	The Vickers hardness

Physical characteristics

Temperature	r, кг/м3	l, Вт/(м · °С)	R, НОм · м	С, Дж/(кг · °С)
0	7830	46	130	-
100	-	46	-	-
300	-	41	-	580
600	-	33	-	970
900	-	29	-	706
400	-	-	-	664
500	-	-	-	819
700	-	-	-	710
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.
Microstructure	The microstructure of the untreated strips with thickness up to 2.2 mm on the other 14-1-2993-80 must meet: lamellar pearlite is not more than 6 points; tsementita mesh - no more than 3 points.
Features of production	Rod on the other 14-1-505-73 comes Beloretsky metallurgical plant.
Grindability	Good.

Steel U7A

Designation

Description

Standards

Chemical composition

Mechanical characteristics

Description mechanical marks

Physical characteristics

A description of the physical symbols

Technological properties

Our consultant will save your time

Subscription

Steel U7A

Designation

Description

Standards

Chemical composition

Mechanical characteristics

Description mechanical marks

Physical characteristics

A description of the physical symbols

Technological properties

Payment ON-LINE

Our consultant will save your time

Subscription