Steel U10A

Designation

Name	The value
Designation GOST Cyrillic	У10А
Designation GOST Latin	U10A
Transliteration	U10A
By chemical elements	10

Description

U10A steel is used: for the manufacture of cores; needle wire; tools, working in conditions without heating of cutting edge; the tool for tree processing (manual transverse and carpentry saws, carpentry saws machinery, twist drills); parts dies of cold forming (exhaust, heading, trimming and blanking) of small size and without sharp transitions in cross section; calibers simple form and low accuracy classes; rollers, files, metal scrapers; cold-rolled heat-treated ribbon with a thickness of from 2.5 to 0.02 mm designed for making flat and wire springs and spring-loaded parts of complex configuration (valves, styli, reeds, slats dolnych knives, small constructional details, including hours, etc. (tape is produced according to GOST 2283, GOST 21996 and a number of special technical conditions); heat-treated ribbon with a thickness of 0,35−0,70 mm for making voice reeds for musical instruments; 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; details of the watch industry, subjected to subsequent thermal treatment.

Standards

Name	Code	Standards
Sheets and strips	В23	GOST 103-2006
Bars and shapes	В22	GOST 1133-71, GOST 2590-2006, GOST 2591-2006, GOST 2879-2006
Bars and shapes	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 14-1-2607-78, TU 14-1-3390-82, TU 14-1-505-73, TU 14-1-924-74, TU 14-130-263-94, TU 14-11-245-88, ChMTU-1-424, TU 14-1-1271-75
Tape	В34	GOST 2283-79, GOST 15146-69, GOST 21996-76, GOST 21997-76, TU 3-939-81, TU 14-133-201-99, TU 14-1-2993-80, TU 14-4-303-87, TU 14-4-99-73
Sheets and strips	В33	GOST 4405-75, TU 14-131-971-2001
Steel wire medium and high carbon	В72	GOST 5468-88, GOST 9389-75
Classification, nomenclature and General rules	В20	OST 1 90005-91
Blanks. Of the workpiece. Slabs	В31	TU 14-1-3300-81, TU 14-19-1-85
Tape	В24	TU 14-4-107-72

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	Cu
TU 14-1-2993-80	0.95-1.09	≤0.018	≤0.025	0.17-0.28	≤0.2	0.17-0.33	≤0.25	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 properties

Section, mm	σ_U, MPa	d₅, %	d₄	y, %	HRC	HV, MPa
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
A sample with a diameter of 5 mm and a length of 25 mm deformed and annealed. The rate of deformation of 10 mm/min strain Rate 0,007 1/C
-	≥105	≥50	-	≥87	-	-
Gradation of performance properties of the finished heat-treated parts for OST 1 90005-91
-	-	-	-	-	44-48	-
Cold-rolled steel strip of 0.1-4.0 mm according to GOST 2283-79 on delivery
0.1-4	740-1180	-	-	-	-	-
A sample with a diameter of 5 mm and a length of 25 mm deformed and annealed. The rate of deformation of 10 mm/min strain Rate 0,007 1/C
-	≥90	≥52	-	≥100	-	-
Cold-rolled steel strip of 0.1-4.0 mm according to GOST 2283-79 on delivery
0.1-4	≤740	-	≥10	-	-	-
A sample with a diameter of 5 mm and a length of 25 mm deformed and annealed. The rate of deformation of 10 mm/min strain Rate 0,007 1/C
-	≥55	≥59	-	≥100	-	-
Cold-rolled steel strip of 0.1-4.0 mm according to GOST 2283-79 on delivery
0.1-4	≤680	-	≥10	-	-	-
A sample with a diameter of 5 mm and a length of 25 mm deformed and annealed. The rate of deformation of 10 mm/min strain Rate 0,007 1/C
-	≥29	≥70	-	≥100	-	-
Cold-rolled steel strip sagatovna (specified strength class)
-	750-900	-	-	-	-	-
A sample with a diameter of 5 mm and a length of 25 mm deformed and annealed. The rate of deformation of 10 mm/min strain Rate 0,007 1/C
-	≥18	≥78	-	≥100	-	-
Cold-rolled steel strip sagatovna (specified strength class)
-	900-1050	-	-	-	-	-
A sample with a diameter of 5 mm and a length of 25 mm deformed and annealed. The rate of deformation of 10 mm/min strain Rate 0,007 1/C
-	≥16	≥86	-	≥100	-	-
Cold-rolled steel strip sagatovna (specified strength class)
-	1050-1200	-	-	-	-	-
Bars with special surface finish as supplied on the other 14-1-2607-78
1-4	740-980	-	-	-	-	-
4-6	690-880	-	-	-	-	-
Bars with special surface finish as supplied on the other 14-1-3390-82
1-4	780-930	-	-	-	-	-
4-6	740-880	-	-	-	-	-
6-12	690-830	-	-	-	-	-
The silverfish in the state of delivery on the other 14-1-924-74
0.4-0.95	736-883	-	-	-	-	-

Description mechanical marks

Name	Description
σ_U	Limit short-term strength
d₅	Elongation after rupture
d₄	Elongation after rupture
y	The relative narrowing
HRC	Rockwell hardness (indenter diamond spheroconical)
HV	The Vickers hardness

Physical characteristics

Temperature	r, kg/m³	l, W/(m · °C)	R, Mr. · m	a, 10^-6 1/°C
20	7810	40	420	-
100	-	44	-	115
300	-	41	-	125
600	-	38	-	139
900	-	34	-	-
200	-	-	-	119
400	-	-	-	13
500	-	-	-	134
700	-	-	-	143
800	-	-	-	139
1000	-	-	-	154
1200	-	-	-	133

A description of the physical symbols

Name	Description
Е	The normal elasticity modulus
l	Coefficient of thermal conductivity
R	UD. the resistivity
a	The coefficient of linear expansion

Technological properties

Name	The value
Weldability	Does not apply to welded structures. Method of welding - CCC.
Склонность к отпускной хрупкости	Tend not.
The temperature of forging	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.
Machinability	When HB 197 Kn TV.SPL.=1,1 Kn b.St.=1,0.
Macrostructure and pollution	The pollution of steel bars non-metallic inclusions on the other 14-1-2607-78 shall not exceed the oxides 1 point, sulfides - 1 point. In the steel does not allow for annealing carbon - graphite. The fracture of steel, which is controlled on the bars with diameter 3.0 mm and above shall be homogeneous and fine-grained. The break should be free of voids, supernote, delaminations, cracks, bubbles and inclusions visible to the naked eye. Decarbonisation on the bars is not allowed.
Microstructure	The microstructure is granular pearlite silverfish on the other 14-1-924-74 should correspond to points 2-6 of the scale 2 GOST 8233. Microstructure of steel on the other 14-1-2607-78 should consist of uniformly distributed fine pearlite and must comply with the points 1-3 scale GOST 801. 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.
Particularities of production of goods	Rod on the other 14-1-505-73 comes Beloretsky metallurgical plant. Bars on the other 14-1-2607-78 supplied in cold-worked condition.
Sanding behaviour	Good.