By visiting this site, you accept the use of cookies. More about our cookie policy.

U10A steel

U10A steel

U10A Steel: Handbook of steels and alloys. Below is systematized information about the purpose, chemical composition, types of supply, substitutes, critical point temperature, physical, mechanical, technological and foundry properties for the brand — U10A Steel.

General information on steel U10A

Substitute for the grade
Of steel grade: У11, У12, У12А.
Type of delivery
U10a-strip, U10a-sheet, sections, including shaped: GOST 1435−74, GOST 2590−71, GOST 2591−71, GOST 2879−69. Calibrated rod GOST 1435−74, GOST 7417−75, GOST 8559−75, GOST 8560−78. Grinded rod and silversilver GOST 1435−74, GOST 14955−77. Tape GOST 2283−79, GOST 21997−76. Tape GOST 103−76, GOST 4405−75. Forgings and forged blanks GOST 1435−74, GOST 4405−75, GOST 1133−71.
Application
The tool working under conditions that do not cause the cutting edge heat: hand taps, rasp files, files, saws for woodworking, dies for cold forging, smooth gauges, axes.

Chemical composition of steel U10A

Chemical element %
Silicon (Si) 0.17−0.33
Manganese (Mn) 0.17−0.28
Copper (Cu), not more 0.20
Nickel (Ni), not more than 0.20
Sulfur (S), not more than 0.018
Carbon (C) 0.96−1.03
Phosphorus (P), not more than 0.025
Chromium (Cr), not more than 0.20

Mechanical properties of U10A steel

Mechanical properties

Heat treatment, delivery condition σB, MPa δ5, %
Rolled section 0,1−4,0 mm.
Cold rolled annealed strip 750 10
Cold-rolled annealed strip 750−1200  
Cold-rolled flat steel strip, strength class H1 750−900  
Cold-rolled flat steel strip, strength class H2 900−1050  
Cold-rolled flat steel strip, strength class H3 1050−1200  
Strip annealed of the highest quality category. 700 13

Mechanical properties depending on test temperature

t test temperature,°C σB, MPa δ5, % ψ, %
Specimen with diameter of 5 mm and length of 25 mm deformed and annealed. Straining speed 10 mm/minute. Strain rate 0.007 1/s.
700 105 50 87
800 90 52 100
900 55 59 100
1000 29 70 100
1100 18 78 100
1200 16 86 100

Technological properties of U10A steel

Forging temperature
The beginning 1180, the end 800. Cooling of blanks with a cross section of up to 100 mm in the air, 101−300 mm — in the pit.
Weldability
Not applicable for welded structures. The method of welding is CTS.
The machinability by cutting
At NV 197 Kυ tv.spl. = 1.1, Kυ b.st. = 1.0.
Tendency to tempering ability
is not prone to
Flockensitivity
not sensitive
Grindability
good

The temperature of critical points of U10A steel

Critical point °С
Ac1 730
Ac3 800
Ar1 700
Mn 210

Hardness of steel U10A

Delivery condition, heat treatment regime HRCe surface HB
Annealing   207
Tempering 770−800 C, water. St. 63  
Section up to 10−12 mm. Tempering at 800 C, oil or molten salts at 190 C. Tempering at 160−200 С. 57−61  
Section up to 8 mm. Tempering at 800 C, oil or molten salts at 190 C. Tempering 380−480 C. (recommended for springs and spring-type parts) 44−50  
Cross section up to 66mm. Quench 770 C, water or 5−10% NaCl solution. Tempering 170 C. 59−63  
Springs. Isothermal hardening 800 C in molten salts with water. Isothermal temperature 280−360 C. Tempering 280−360 C. 44−52  
Surface hardening with induction heating. Tempering 160−200 C. 59−63  
Hardening at 760−780°C with water. Tempering 160−200 C.    
Hardening 760−780 C, water. Tempering 200−300 C.    
Hardening 760−780 C, water. Tempering 300−400 C.    
Hardening 760−780 C, water. Tempering 400−500 C.    

Hardenability of steel U10A

Distance from the end face, mm / HRCe
1.5 3 6 9 15 35 48
62−67 46,5−54 38−42,5 35−40 31−35,5 22−27,5 22
Heat treatment Crit. dia. in water, mm Crit. dia. in oil, mm Cret. hardness, HRCe
Hardening 15−20 4−6 61
Hardening 800 C. 20   43−66

Physical properties of U10A steel

Test temperature, °С 20 100 200 300 400 500 600 700 800 900
Steel density, pn, kg/m3 7810                  
Thermal conductivity coefficient W/(m — °C) 40 44   41     38     34
Electrical resistivity (p, nominal value — m) 420                  
Test temperature,°C 20−100 20−200 20−300 20−400 20−500 20−600 20−700 20−800 20−900 20−1000
Coefficient of linear expansion (a, 10−6 1/°C) 11.5 11.9 12.5 13.0 13.4 13.9 14.3 13.9 15.4 13.3

Heat resistance, red resistance of steel U10A

Heat resistance

Temperature, °С Time, h Hardness, HRCэ
150−160 1 63
200−250 1 59