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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

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