Steel 55KH20G9AN4 (ЭП303)

Designation

Name The value
Designation GOST Cyrillic 55Х20Г9АН4
Designation GOST Latin 55X20G9AH4
Transliteration 55H20G9AN4
By chemical elements 55Cr20Mn9NН4
Name The value
Designation GOST Cyrillic ЭП303
Designation GOST Latin EP303
Transliteration EhP303
By chemical elements -

Description

55KH20G9AN4 steel is used: for the manufacture of valves of automobile engines.

Note

Heat-resistant steel and heat resistant austenitic class.
The recommended maximum operating temperature for a very long time +600 °C.
The temperature of beginning of intensive scaling in air +750 °C.

Standards

Name Code Standards
Classification, nomenclature and General rules В30 GOST 5632-72
Blanks. Of the workpiece. Slabs В31 OST 3-1686-90
Bars and shapes В32 TU 14-1-1049-74, TU 14-1-2115-77, TU 14-1-3241-81, TU 14-11-245-88

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu N Ti Mo
GOST 5632-72 0.5-0.6 ≤0.03 ≤0.04 8-10 20-22 ≤0.45 3.5-4.5 Rest ≤0.3 0.3-0.6 ≤0.2 ≤0.3
Fe is the basis.