Steel PT70

Designation

Name The value
Designation GOST Cyrillic ПТ70
Designation GOST Latin PT70
Transliteration PT70
By chemical elements PTi70

Description

Steel PT70 is used: for the manufacture of rails type R18 and R24 designed for installation on the Railways narrow gauge.

Note

Steel for the manufacture of rails is made with a degree of deoxidation SP (calm).

Standards

Name Code Standards
Rails. Lining. Lining. Crutches В42 GOST 5876-82, GOST 6368-82

Chemical composition

Standard C S P Mn Si Fe As
GOST 5876-82 0.67-0.82 ≤0.045 ≤0.04 0.5-1.4 ≥0.13 Rest 0.15
Fe is the basis.
According to GOST 5876-82 in the steel smelted on the basis of Kerch ores, a mass fraction of sulfur and phosphorus is allowed up to 0.050%. With a mass fraction of carbon above 80%, the mass fraction of manganese in the PT70 grade steel should not exceed 1.05%.

Mechanical properties

Section, mm σU, MPa HB, MPa
Mechanical properties of steel for rails PT70 type R18 and R24 according to GOST 5876-82 on delivery
≥740 ≥250

Description mechanical marks

Name Description
σU Limit short-term strength
HB Brinell hardness number