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Steel 35X

Description

Steel 35X

Steel 35X: 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 grade — Steel 35X.

General information about steel 35X

Substitute brand
steel: 40Х, 35ХР.
Delivery type
Circle 35x, rolled sections, including shaped: GOST 4543−71, GOST 2590−71, GOST 2591−71, GOST 2879−69, GOST 10702−78. Calibrated bar GOST 7414−75, GOST 8559−75, GOST 8560−78, GOST 1051−73. Polished bar and silver bar GOST 14955−77. Strip GOST 103−76. Forgings and forged billets GOST 8479−70, GOST 1131−71.
Application
axles, shafts, gears, ring rails and other upgradable parts.

The chemical composition of steel 35X

Chemical element %
Silicon (Si) 0.17−0.37
Manganese (Mn) 0.50−0.80
Copper (Cu), no more 0.30
Nickel (Ni), no more 0.30
Sulfur (S), no more 0.035
Carbon (C) 0.31−0.39
Phosphorus (P), no more 0.035
Chromium (Cr) 0.80−1.10

Mechanical properties of 35X steel

Mechanical properties

Heat treatment, delivery condition Section, mm σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% KCU, J / m 2 HB
Bar. Hardening 860 ° C, oil. Vacation 500 ° C, water or oil. 25 730 910 eleven 45 69  
Forgings. Hardening. Vacation. KP 395 100−300 395 615 fifteen 40 54 187−229
Forgings. Hardening. KP 490 vacation <100 490 655 sixteen 45 59 212−248

Mechanical properties at elevated temperatures

test t, ° C σ 0.2, MPa σ B, MPa δ 5 ,%
Hardening 840 ° С, oil. Vacation 580 ° C.
20 460 690 28
200 390 700 22
300 360 670 22
400 310 540 24

Mechanical properties depending on the tempering temperature

vacation t, ° С σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% KCU, J / m 2
Hardening 850 ° C, water.
500 880 980 fifteen 53 98
600 680 830 19 61 127
700 540 710 24 68 166

Mechanical properties depending on the section

Section, mm σ 0.2, MPa σ B, MPa δ 5 ,% ψ,% KCU, J / m 2 HB
Normalization at 850 ° C. Vacation 660 ° C, air. Hardening 850 ° C, water. Vacation 570 ° C, water or oil
thirty 760 880 fifteen 50 78 262
50 650 820 fifteen 50 78 248
Normalization at 850 ° C. Vacation 660 ° C, air. Hardening 850 ° C, water. Vacation 610 ° C, water or oil
80 550 740 fifteen 50 78 217
120 490 700 fifteen 50 59 207
160 450 670 fifteen 50 59 197
240 390 630 fifteen 50 59 187

Technological properties of steel 35X

Forging temperature
Beginning 1250, end 800.
Weldability
restrictedly weldable. Welding methods: RDS, EShS. Heating and subsequent heat treatment is recommended. KTS — subsequent heat treatment is recommended.
Machinability by cutting
In the hot-rolled state at HB 163 and σ B = 610 MPa K υ b.st. = 0.95.
Tendency to release ability
inclined
Flock sensitivity
insensitive

Temperature of critical points of steel 35X

Critical point ° C
Ac1 743
Ac3 782
Ar3 730
Ar1 693
Mn 390

Impact strength of 35X steel

Impact strength, KCU, J / cm 2

Delivery status, heat treatment +20 -25 -70
Guenching 860 C, oil. Vacation 580 C. 101 69 48

Endurance limit of steel 35X

σ -1, MPa τ -1, MPa n σ B, MPa
362 240 1E + 6 690

Hardenability of steel 35X

Hardness for strips HRCe.

Distance from the end, mm / HRC e
1.5 3 4.5 6 7.5 nine 10.5 12 13.5 eighteen
44.5−55 42.5−54 40.5−53.5 36.5−53 32−51.5 29−48.5 28−45.5 25−43.5 23−43.5 20−36
Heat treatment Amount of martensite,% Crit. Diam. in oil, mm
Hardening 50 15−25

Physical properties of steel 35X

Test temperature, ° С 20 100 200 300 400 500 600 700 800 900
Normal elastic modulus, E, GPa 214     207   176        
Torsional shear elastic modulus G, GPa 83     74   65        
Thermal conductivity coefficient W / (m ° С)   47 43 40 36          
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) 11.3 12.0 12.9 13.7 14.2 14.6        

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