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	σ_U, 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
σ_U	Limit short-term strength
HB	Brinell hardness number