Steel 08
Description
Steel 08
Steel 08: a 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 Steel 08 grade.
General steel 08
| Substitute brand |
| steel 10 |
| Delivery type |
| Bar 08, sheet 08, strip 08, strip 08, wire 08, long products, including shaped: GOST 2590−71, GOST 2591−71, GOST 2879−69, GOST 8509−86, GOST 8510−86, GOST 1050 -74, GOST 8240−72, GOST 8239−72, GOST 10702−78. Calibrated bar GOST 7417−75, GOST 8560−79, GOST 8559−75, GOST 10702−78. Polished bar and silver bar GOST 10702−78, GOST 14955−77. Thick sheet GOST 1577−81, GOST 19903−74. Thin sheet GOST 16523−70. Tape GOST 6009−74, GOST 10234−77. Strip GOST 103−76, GOST 82−70, GOST 1577−81. Wire GOST 5663−79, GOST 10702−78. Pipes GOST 10704−91, GOST 1075−80. |
| Application |
| Details that require high plasticity: washers, nozzles, gaskets and other irrelevant parts operating in the temperature range from -40 to 450 ° C. |
Chemical composition of steel 08
| 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) |
0.05−0.12 |
| Phosphorus (P), no more |
0.035 |
| Chromium (Cr), no more |
0.10 |
Mechanical properties of steel 08
| Heat treatment, delivery condition |
σ B, MPa |
δ 5 ,% |
ψ,% |
HB |
| Hot-rolled forged steel, calibrated and silver grade 2 after normalization. |
323 |
33 |
60 |
|
| Calibrated and calibrated steel with special finishing after annealing or tempering. |
315−410 |
|
55 |
131 |
| Calibrated work-hardened steel with special finishing without heat treatment |
370 |
8 |
55 |
179 |
| Normalized and hot rolled sheets |
310 |
32 |
|
|
| Normalized and hot rolled strips |
320 |
33 |
60 |
|
| Annealed crimped tape |
<450 |
20 |
|
|
| Heat-treated sheet of the 1st-2nd category |
275−410 |
32 |
|
109 |
| Hot rolled sheet |
275−390 |
24 |
|
|
Mechanical properties at elevated temperatures
| test t, ° C |
σ 0.2, MPa |
σ B, MPa |
δ 5 ,% |
ψ,% |
KCU, J / m 2 |
| Hot rolled steel |
| 20 |
175 |
315 |
20 |
77 |
63 |
| 200 |
205 |
390 |
sixteen |
65 |
137 |
| 300 |
98 |
370 |
24 |
67 |
127 |
| 400 |
88 |
275 |
31 |
77 |
118 |
| 500 |
78 |
195 |
33 |
78 |
88 |
| 650 |
59 |
140 |
41 |
85 |
78 |
Technological properties of steel 08
| Forging temperature |
| Beginning 1250, end 800. Billets with a cross section of up to 300 mm are cooled in air. b 400 1 / 10,000 = 76MPa, b 400 1/10,000 = 108MPa. |
| Weldability |
| It can be welded without restrictions, except for parts after chemical-heat treatment; welding methods: RDS, ADS submerged arc and gas shielded, KTS. |
| Machinability by cutting |
| In the hot-rolled state at HB 131 and σ B = 315−410 MPa K υ tv.spl. = 2,1, K υ b.st. = 1.65. |
| Tendency to release ability |
| Not inclined. |
| Flock sensitivity |
| Not sensitive. |
Temperature of critical points of steel 08
| Critical point |
° C |
| Ac1 |
735 |
| Ac3 |
874 |
| Ar3 |
854 |
| Ar1 |
680 |
Impact strength of steel 08
Impact strength, KCU, J / cm 2
| Delivery status, heat treatment |
+20 |
-20 |
-40 |
| Pktok with a diameter of 20 mm. Normalization 950 C |
235 |
91 |
ten |
Endurance limit steel 08
| σ -1, MPa |
σ B, MPa |
σ 0.2, MPa |
| 176 |
325 |
195 |
Physical properties of steel 08
| Test temperature, ° С |
20 |
100 |
200 |
300 |
400 |
500 |
600 |
700 |
800 |
900 |
| Normal elastic modulus, E, GPa |
203 |
207 |
182 |
153 |
141 |
|
|
|
|
|
| Density of steel, pn, kg / m 3 |
7871 |
7846 |
7814 |
7781 |
7745 |
7708 |
7668 |
7628 |
7598 |
7602 |
| Thermal conductivity coefficient W / (m ° С) |
|
60 |
56 |
51 |
47 |
41 |
37 |
34 |
thirty |
27 |
| Ud. electrical resistance (p, Nom. m) |
|
178 |
252 |
341 |
448 |
575 |
725 |
898 |
1073 |
1124 |
| 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) |
12.5 |
13.4 |
14.0 |
14.5 |
14.9 |
15.1 |
15.3 |
14.7 |
12.7 |
13.8 |
| Specific heat (C, J / (kg ° C)) |
482 |
498 |
514 |
533 |
555 |
584 |
626 |
695 |
703 |
695 |
