Steel 08kp
Description
Steel 08kp
Steel 08kp: brand of steels and alloys. Below is the 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 08kp.
General information about steel 08kp
| Substitute brand |
| steel 08 |
| Delivery type |
| Sheet 08kp, tape 08kp, long products, including shaped: GOST 2590−71, GOST 2879−69, GOST 10702−78. Calibrated bar GOST 7417−75, GOST 8560−78, GOST 10702−78. Polished bar and silver bar GOST 14955−77, GOST 10702−78. Thin sheet GOST 16523−70, GOST 19903−74, GOST 19904−74, GOST 9045−80. Tape GOST 503−81, GOST 10234−77. Strip GOST 1577−81, GOST 82−70. Pipes GOST 10705−80, GOST 10704−91. Thick sheet GOST 4041−71, GOST 19903−74, GOST 1577−81. |
| Application |
| For gaskets, washers, forks, pipes, as well as parts subjected to chemical heat treatment — bushings, lugs, rods. |
Chemical composition of 08kp steel
| Chemical element |
% |
| Silicon (Si), no more |
0.03 |
| Manganese (Mn) |
0.25−0.50 |
| 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) |
0.05−0.11 |
| Phosphorus (P), no more |
0.035 |
| Chromium (Cr), no more |
0.10 |
Mechanical properties of 08kp steel
| Heat treatment, delivery condition |
σ B, MPa |
δ 5 ,% |
δ 4 ,% |
ψ,% |
HB |
| Heat-treated sheets of the 3rd category |
<365 |
36 |
|
|
98 |
| Heat-treated cold-rolled sheets |
255−365 |
|
28 |
|
|
| Annealed crimped tape |
<450 |
20 |
|
|
|
| Extra soft cold-rolled strip |
245−390 |
|
23 |
|
|
| Cold rolled soft tape |
315−440 |
|
17 |
|
|
| Cold-rolled semi-rolled strip |
370−510 |
|
7 |
|
|
| Cold-rolled cold-worked strip |
440−590 |
|
4 |
|
|
| Calibrated and calibrated steel with special finishing after annealing or tempering |
310−410 |
|
|
60 |
131 |
| Calibrated and calibrated steel with special finishing after spheroidizing annealing |
290−390 |
|
|
60 |
131 |
| Calibrated and calibrated steel with special finishing after annealing, cold-worked |
370 |
8 |
|
60 |
179 |
Mechanical properties depending on the section
| Heat treatment, delivery condition |
Section, mm |
σ 0.2, MPa |
σ B, MPa |
δ 5 ,% |
δ 4 ,% |
ψ,% |
| Normalized or hot rolled strips |
6−25 |
175 |
295 |
35 |
|
60 |
| Hot rolled sheets |
<2 |
|
275−390 |
|
24 |
|
| Hot rolled sheets |
2−3.9 |
|
275−390 |
|
26 |
|
| Cold rolled sheets |
<2 |
|
275−390 |
|
25 |
|
| Cold rolled sheets |
2−3.9 |
|
275−390 |
|
28 |
|
Technological properties of steel 08kp
| Forging temperature |
| Beginning 1250, end 800. Sections up to 300 mm are cooled in air. |
| 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 08kp
| Critical point |
° C |
| Ac1 |
732 |
| Ac3 |
874 |
| Ar3 |
854 |
| Ar1 |
680 |
Physical properties of steel 08kp
| 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) |
63 |
60 |
56 |
51 |
47 |
41 |
37 |
34 |
thirty |
27 |
| Ud. electrical resistance (p, Nom. m) |
147 |
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 |
