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Steel 15ХФ

Description

Steel 15ХФ

Steel 15HF: a 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 15HF.

General information about steel 15HF

Substitute brand
Steel 20KHF.
Delivery type
Long products, including shaped: GOST 4543−71, GOST 259071, GOST 2591−71, GOST 2879−69, GOST 10702−78. Calibrated bar GOST 7417−75, GOST 8559−75, GOST 8560−78, GOST 10702−78. Polished bar and silver bar GOST 14955−77, GOST 4543−71. Strip GOST 103−76. Forgings and forged billets GOST 1133−71, GOST 4543−71.
Application
For small parts subject to carburizing and low tempering hardening (gear wheels, piston pins, distributor rollers, plungers, copiers).

Chemical composition of steel 15HF

Chemical element %
Vanadium (V) 0.06−0.12
Silicon (Si) 0.17−0.37
Manganese (Mn) 0.40−0.70
Copper (Cu), no more 0.30
Nickel (Ni), no more 0.30
Sulfur (S), no more 0.035
Carbon (C) 0.12−0.18
Phosphorus (P), no more 0.035
Chromium (Cr) 0.80−1.10

Mechanical properties of steel 15HF

Heat treatment, delivery condition Section, mm σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% KCU, J / m 2 HRC e
Bar. Hardening 880 ° C, water or oil. Hardening 760−810 ° C, water or oil. Vacation 180 ° C, air or oil. fifteen 540 730 thirteen 50 78  
Cementation 930 ° C, 12 h. Normalization 875 ° C, air. Hardening 800 ° C, oil. Vacation 200 ° С   350−380 610−690 16−20 43−55 59−98 59−63
Cementation at 930 ° C, 12 h. Quenching at 875 ° C, oil. Hardening 840 ° С, oil, tempering 200 ° С 25 720−760 960−980 9−12 50−58 78−98 59−63

Mechanical properties at elevated temperatures

test t, ° C σ B, MPa δ 10 ,% ψ,%
Sample 10 mm in diameter and 100 mm long. Annealing. The speed of movement of the grips of the testing machine is 0.4−0.5 mm / min.
800 57 23 62
900 47 26 34
1000 32 43 68
1100 24 47 94
1200 19 60 99

Technological properties of steel 15HF

Forging temperature
Beginning 1250, end 800. Forgings with a cross section of more than 60 mm are cooled slowly.
Weldability
KTS is welded without restrictions, RDS — with heating and subsequent heat treatment.
Tendency to release ability
not inclined
Flock sensitivity
insensitive

Temperature of critical points of steel 15HF

Critical point ° C
Ac1 741
Ac3 843
Ar3 788
Ar1 704
Mn 435

Hardenability of steel 15HF

Hardening 900 C. Hardness for strips of hardenability HRCe.

Distance from the end, mm / HRC e
3 6 nine 12
37.5 28 22.5 20
Heat treatment Amount of martensite,% Crit. Diam. in oil, mm
Hardening 50 12

Physical properties of steel 15HF

Test temperature, ° С 20 100 200 300 400 500 600 700 800 900
Normal elastic modulus, E, GPa 206                  
Density of steel, pn, kg / m 3 7760 7730 7710 7670 7640 7600 7570 7530    
Thermal conductivity coefficient W / (m ° С)   43 42 42 40 36 34 thirty    
Ud. electrical resistance (p, Nom. m)   281 345 421 513 606 731 833    
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) 11.9 12.4 13.1 13.7 14.2 14.5 14.9      

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