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Steel 55

Description

Steel 55

Steel 55: 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 55 grade.

General steel 55

Substitute brand
steel: 50, 60, 50G.
Delivery type
Long products, including shaped: GOST 1050−74, GOST 2590−71, GOST 2591−71, GOST 2879−69, GOST 8509−86, GOST 8510−86, GOST 8239−72, GOST 8240−72. Calibrated bar GOST 7414−75, GOST 8559−75, GOST 8560−78. Polished bar and silver bar GOST 14955−77. Thick sheet GOST 1577−81, GOST 19903−74. Tape GOST 1530−78, GOST 2284−79. Strip GOST 1577−81, GOST 103−76, GOST 82−70. Forgings and forged billets GOST 8479−70, GOST 1131−71. Rolls OST 24.013.21−85, GOST 5399−69, OST 24.013.04−83.
Application
after normalization with tempering and quenching with tempering — gear wheels, rolling rolls, rods, heavily loaded shafts, axles, tires, lightly loaded springs and springs, plowshares, track pins, gearbox clutches, nozzle bodies and other parts operating on friction.

Chemical composition of steel 55

Chemical element %
Silicon (Si) 0.17−0.37
Manganese (Mn) 0.50−0.80
Copper (Cu), no more 0.25
Arsenic (As), no more 0.08
Nickel (Ni), no more 0.25
Sulfur (S), no more 0.040
Carbon (C) 0.52−0.60
Phosphorus (P), no more 0.035
Chromium (Cr), no more 0.25

Mechanical properties of steel 55

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
Normalization
KP 315 100−300 315 570 fourteen 35 34 167−207
Hardening. Vacation.
KP 490. <100 490 655 sixteen 45 59 212−248

Mechanical properties depending on the tempering temperature

vacation t, ° С σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% KCU, J / m 2 HRC e
Hardening 840 ° С, oil.
200 1620−2210 1720−2280 2−3 7−12 5−10 64
300 1350−1790 1500−1940 3−4 20−25 5−10 56
400 1100−1380 1260−1590 4−5 31−36 19−49 47
500 820−1000 970−1120 7 41−45 39−78 40
600 600−700 800−890 10−11 51−54 69−108 thirty

Mechanical properties depending on the section

Section, mm σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% KCU, J / m 2 HB
Hardening 840 ° C, water. Vacation 400 ° C, air.
20 870−990 1060−1210 7−8 43−52 54−67 341
40 640−740 900−1000 10−11 43−47 39−53 290
60 590−650 820−930 10−12 42−46 32−49 266
Hardening 840 ° C, water. Vacation 500 ° C, air.
20 710−800 900−1000 10−12 53−59 59−98 285
40 550−610 820−900 12−14 45−52 49−69 264
60 510−570 750−850 13−14 43−52 39−59 239
Normalization 830−860 ° C, air. Vacation 650−800 ° С, oven.
<100 325 650 12 35 29  
101−300 315 630 eleven 28 25 170−229
301−500 305 610 ten 25 25  
Normalization 830−860 ° C, air. Vacation 550−600 ° C, oven or air.
<1200           215−255

Technological properties of steel 55

Forging temperature
Beginning 1240, end 800. Sections up to 400 mm are cooled in air.
Weldability
Not applicable for welded structures. KTS with subsequent heat treatment.
Machinability by cutting
In the normalized state at HB 212−225 K υ tv.spl. = 1, K υ b.st. = 0.65.
Tendency to release ability
Not inclined.
Flock sensitivity
Insensitive.

Temperature of critical points of steel 55

Critical point ° C
Ac1 725
Ac3 755
Ar3 750
Ar1 690
Mn 320

Impact strength of steel 55

Impact strength, KCU, J / cm 2

Delivery status, heat treatment +20 -20 -50
Hot rolled 26 eighteen thirteen

Endurance limit steel 55

σ -1, MPa τ -1, MPa n Heat treatment, steel condition
377 219 1E + 6 Tempering 790 C, water. Vacation 650 С, air.

Hardenability of steel 55

Hardening 850 C. Hardness for hardenability strips HRCe.

Distance from the end, mm / HRC e
1.5 3 4.5 6 7.5 nine 12 fifteen eighteen 24
54−63 41.5−59.5 35−53 32−46.5 30−41 28.5−38.5 27−35.5 26−34 25−33 22.5−32
Amount of martensite,% Crit. Diam. in water, mm Crit. Diam. in oil, mm
50 16−28 9−16

Physical properties of steel 55

Test temperature, ° С 20 100 200 300 400 500 600 700 800 900
Normal elastic modulus, E, GPa 210                  
Density of steel, pn, kg / m 3 7280                  
Thermal conductivity coefficient W / (m ° С)   68 55   36 32        
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) 11.0 11.9 12.7 13.4 14.0 14.5 14.8 12.5 13.5 14.4
Specific heat (C, J / (kg ° C)) 479 487   525 571          

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