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 |
|
|
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|
|
|
|
|
| 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 |
