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Steel 55KH

Steel 45KhNM (45KhNMA) 4X2NMF steel Steel 55X Steel 60Kh2SMF Steel 60CrNiG 60KhN steel 75XM steel Steel 75KhSMF 7X2SMF steel Steel 90KhMF Steel 9Х2МФ (9Х2МФА)

Designation

Name The value
Designation GOST Cyrillic 55Х
Designation GOST Latin 55X
Transliteration 55H
The chemical elements 55Cr

Description

55KH steel is used: for the manufacture of a compound of the axes of the backup rolls for cold rolling of metals; work rolls Blumenhof, rollable, billet, rail and structural steel, heavy section, medium section and light section mills and work rolls of sheet mills for hot rolling of metals; gear shafts, gears and other stressed parts exposed to abrasion, but working without significant impact.

Standards

Name Code Standards
Metal forming. Forgings В03 GOST 8479-70, TU 108-11-905-87

Chemical composition

Standard C S P Mn Cr Si Ni
0.5-0.6 ≤0.04 ≤0.04 0.35-0.65 1-1.3 0.17-0.37 ≤0.5

Mechanical characteristics

Section, mm sT|s0,2, MPa σB, MPa d5, % y, % kJ/m2, кДж/м2 Brinell hardness number, MPa
Quenching in oil from 820-840 °C + Vacation at 560-630 °C, cooling in furnace or in air
≤100 ≥640 ≥840 ≥12 ≥40 - 255-322
Superheat temperature of 1220 °C, exposure 15 min moving Speed of the grips of the testing machine 150 mm/min.
- - ≥190 ≥52 ≥65 - -
Quenching in oil from 820-840 °C + Vacation at 560-630 °C, cooling in furnace or in air
101-300 ≥540 ≥780 ≥10 ≥35 - 240-302
Superheat temperature of 1220 °C, exposure 15 min moving Speed of the grips of the testing machine 150 mm/min.
- - ≥115 ≥56 ≥80 - -
Quenching in oil from 820-840 °C + Vacation at 560-630 °C, cooling in furnace or in air
301-500 ≥490 ≥730 ≥8 ≥30 - 240-300
Superheat temperature of 1220 °C, exposure 15 min moving Speed of the grips of the testing machine 150 mm/min.
- - ≥78 ≥83 ≥99 - -
Normalization at 840-860 °C, air cooling + Vacation at 580-630 °C, air cooling or pecii
301-500 ≥340 ≥640 ≥8 ≥30 - 210-240
Superheat temperature of 1220 °C, exposure 15 min moving Speed of the grips of the testing machine 150 mm/min.
- - ≥54 ≥89 ≥100 - -
The forging temperature of 1210 °C, exposure time 10 h of Isothermal annealing. Normalization. High vacation.
480 ≥380 ≥780 ≥13 ≥22 ≥210 -
Superheat temperature of 1220 °C, exposure 15 min moving Speed of the grips of the testing machine 150 mm/min.
- - ≥40 ≥99 ≥100 - -
The forging temperature of 1210 °C, exposure time 10 h of Isothermal annealing. Normalization. High vacation.
670 ≥360 ≥760 ≥10 ≥17 ≥200 -
Superheat temperature of 1220 °C, exposure 15 min moving Speed of the grips of the testing machine 150 mm/min.
- - ≥27 - ≥100 - -
The forging temperature of 1210 °C, exposure time 10 h of Isothermal annealing. Normalization. High vacation.
960 ≥340 ≥750 ≥9 ≥15 ≥180 -

Description mechanical marks

Name Description
Section Section
sT|s0,2 Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
σB Limit short-term strength
d5 Elongation after rupture
y The relative narrowing
kJ/m2 Toughness

Technological properties

Name The value
Weldability Steel difficult weldability. Welding methods: SMAW, essential heating and subsequent heat treatment. The CCC, the necessary subsequent heat treatment.
Propensity to temper brittleness Inclined.
Forging temperature Beginning - 1220 °C, the end - of 800 °C. the cross Sections up to 200 mm are cooled in air, 200-350 mm in the pit.
Flock-sensitive sensitivity Sensitive.

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