Steel 15
Description
Steel 15
Steel 15: brand of steels and alloys. Below is a systematized information on the purpose, chemical composition, types of supplies, substitutes, temperature of critical points, physical, mechanical, technological and casting properties for the grade — Steel 15.
General steel 15
| Substitute brand |
| steel: steel 10, 20 |
| Delivery type |
| Long products, including shaped: GOST 1050−74, GOST 2591−71, GOST 2879−69, GOST 8509−86, GOST 8510−86, GOST 8240−72, GOST 8239−72, GOST 2590−71. Calibrated bar GOST 7417−75, GOST 8559−75, GOST 8560−78, GOST 10702−78. Polished path and silver metal GOST 14955−77, GOST 10702−78. Thick sheet GOST 1577−81, GOST 19903−74. Thin sheet GOST 16523−70. Tape GOST 6009−74, GOST 2284−79, GOST 10234−77. Strip GOST 103−76, GOST 82−70. Wire GOST 5663−79, GOST 17305−71. Forgings and forged billets GOST 8479−70. Pipes GOST 10705−80, GOST 10704−91. |
| Application |
| Bolts, screws, hooks and other parts that require high ductility and work at temperatures from -40 to 450 ° C; after HTT — levers, cams, nuts and other parts, which are subject to the requirements of high surface hardness and low core strength. |
Chemical composition of steel 15
| Chemical element |
% |
| Silicon (Si) |
0.17−0.37 |
| Manganese (Mn) |
0.35−0.65 |
| Copper (Cu), no more |
0.25 |
| Arsenic (As), no more |
0.08 |
| Nickel (Ni), no more |
0.25 |
| Sulfur (S), no more |
0.04 |
| Carbon (C) |
0.12−0.19 |
| Phosphorus (P), no more |
0.035 |
| Chromium (Cr), no more |
0.25 |
Mechanical properties of steel 15
| Heat treatment, delivery condition |
σ B, MPa |
δ 5 ,% |
δ 4 ,% |
ψ,% |
HB |
| Hot rolled steel, forged, calibrated and silver grade 2 after normalization. |
375 |
27 |
|
55 |
|
| Calibrated steel grade 5 after annealing or high tempering |
345 |
23 |
|
55 |
|
| Calibrated and calibrated steel with special finishing after annealing or tempering |
365−470 |
|
|
55 |
149 |
| Calibrated and calibrated steel with special finishing after spheroidizing annealing |
325−420 |
|
|
55 |
149 |
| Steel calibrated and calibrated with a special finish, work-hardened without heat treatment |
440 |
8 |
|
45 |
197 |
| Normalized or hot rolled strips |
370 |
27 |
|
55 |
|
| Hot rolled sheet |
330−460 |
|
23 |
|
|
| Cold rolled sheet |
330−460 |
|
24 |
|
|
Mechanical properties of forgings
| Heat treatment, delivery condition |
Section, mm |
σ 0.2, MPa |
σ B, MPa |
δ 5 ,% |
ψ,% |
KCU, J / m 2 |
HB |
| Nominalization |
| KP 175 |
<100 |
175 |
355 |
28 |
55 |
64 |
101−143 |
| KP 175 |
100−300 |
175 |
355 |
24 |
50 |
59 |
101−143 |
| KP 195 |
<100 |
195 |
390 |
26 |
55 |
59 |
111−156 |
Technological properties of steel 15
| Forging temperature |
| Beginning 1300, end 700. Air cooling. |
| Weldability |
| No restrictions, except for XTO parts; welding methods: RDS, ADS submerged arc and gas protection, KTS. |
| Machinability by cutting |
| In the hot-rolled state at HB 143 K υ tv.spl. = 1.8. |
| Tendency to release ability |
| Not inclined. |
| Flock sensitivity |
| Not sensitive. |
Temperature of critical points of steel 15
| Critical point |
° C |
| Ac1 |
735 |
| Ac3 |
860 |
| Ar3 |
840 |
| Ar1 |
685 |
Impact strength of steel 15
Impact strength, KCU, J / cm 2
| Delivery status, heat treatment |
+20 |
-20 |
-40 |
-60 |
| Hot rolled |
73−113 |
75−86 |
14−26 |
sixteen |
| Annealed |
82−84 |
49−57 |
14−35 |
8 |
| Normalized |
120 |
53−80 |
66 |
48−65 |
Hardenability of steel 15
Hardness for hardenability strips, HRB.
| Distance from the end, mm / HRC e |
| 1.5 |
3 |
4.5 |
6 |
12 |
fifteen |
eighteen |
21 |
24 |
| 102−108 |
94−99 |
90−96 |
88−91.5 |
82.5−99 |
79.5−87 |
78−84 |
75.5−81.5 |
74−80 |
Physical properties of steel 15
| Test temperature, ° С |
20 |
100 |
200 |
300 |
400 |
500 |
600 |
700 |
800 |
900 |
| Normal elastic modulus, E, GPa |
201 |
192 |
185 |
176 |
156 |
|
|
|
|
|
| Torsional shear elastic modulus G, GPa |
83 |
78 |
77 |
74 |
71 |
68 |
63 |
|
|
|
| Density of steel, pn, kg / m 3 |
7850 |
7828 |
7794 |
7759 |
7724 |
7687 |
7648 |
7611 |
7599 |
7584 |
| Thermal conductivity coefficient W / (m ° С) |
53 |
53 |
53 |
49 |
46 |
43 |
39 |
36 |
32 |
thirty |
| Ud. electrical resistance (p, Nom. m) |
|
233 |
296 |
387 |
487 |
607 |
753 |
904 |
1092 |
1140 |
| Test temperature, ° С |
20−100 |
20−200 |
20−300 |
20−400 |
20−500 |
20−600 |
20−700 |
20−800 |
20−900 |
20−1000 |
| Linear expansion coefficient (a, 10−6 1 / ° С) |
12.4 |
13.2 |
13.9 |
14.4 |
14.8 |
15.1 |
15.3 |
14.1 |
13.2 |
13.3 |
| Specific heat (C, J / (kg ° C)) |
465 |
486 |
515 |
532 |
565 |
586 |
620 |
691 |
708 |
|
