Steel 4

Designation

Name The value
Designation GOST Cyrillic 4
Designation GOST Latin 4
Transliteration 4
By chemical elements 4

Description

The steel 4 is used: for the manufacture of rough locomotive tires increased hardness and operational stability for freight and shunting locomotives; solid-rolled rings for different purposes.

Note

Steel bandage.

Standards

Name Code Standards
Bandages. Wheels. Axis В41 GOST 398-2010, TU 0941-096-01124323-2007
Bars and shapes В32 OST 1 92049-76

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu V Mo
TU 0941-096-01124323-2007 0.65-0.75 ≤0.02 ≤0.03 0.6-0.9 0.2-0.6 0.22-0.45 - Rest - ≤0.03 -
GOST 398-2010 0.65-0.75 ≤0.02 ≤0.03 0.6-0.9 0.2-0.6 0.22-0.45 ≤0.25 Rest ≤0.3 ≤0.15 ≤0.08
Fe is the basis.
According to TU 0941-096-01124323-2007 the mass fraction of oxygen should not exceed 40 ppm. The mass fraction of hydrogen in liquid steel before casting should not exceed 0.0002% (2.0 ppm).
According to GOST 398-2010 the total share of sulfur and phosphorus in steel should not exceed 0.040%. The total content of chromium and nickel in the steel should be at least 0.30%. In the bandages, the maximum deviations in the chemical composition are permissible: carbon + 0.030 / -0.020, manganese + 0.050 / -0.030, silicon + 0.030 / -0.020, chromium +0.020, vanadium + 0.010%, phosphorus +0.0050% , in the sulfur +0.0050%. The mass fraction of hydrogen in liquid steel should not exceed 0.00020%.

Mechanical properties

Section, mm sT|s0,2, MPa σU, MPa d5, % y, % KCU, kJ/m2 HB, MPa
Bandages according to GOST 398-2010. Quenching with a separate heating + Vacation
- ≥1050 ≥9 ≥12 ≥1960 320-380
Ring forged in OST 1 92049-76. Quenching in warm water (30-60 °C) with 890-920 °C (speed of 2.0-2.5 hours) + Vacation at 580-620 °C (exposure for 2.5-3.0 h), cooling in water
25 ≥660 ≥835 ≥10.5 - ≥882 -
Heat hardened bandages in the state of delivery on the other 0941-096-01124323-2007 (NV bandages at a depth of 20 mm)
- 1050-1270 ≥9 ≥12 ≥2000 320-360

Description mechanical marks

Name Description
sT|s0,2 Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
σU Limit short-term strength
d5 Elongation after rupture
y The relative narrowing
KCU Toughness
HB Brinell hardness number