EN 10084 is standard Case hardening steels. It specifies the requirements for semi finished products, steel bars, rods, wide flats, hot rolled strip and sheet/plates. All steel materails in EN 10084 are in general intended for the fabrication of case hardening machine parts.
Material in accordance with EN 10084 specification is classified by chemical composition. Common and popular steel grades are like 16MnCr5（1.7131）, 20MnCr5（1.7147）, 16NiCr4(1.5714), 20NicrMo2-2(1.6523), 18CrNiMo7-6(1.6587) etc.
1.6587 Steel: 18CrNiMo7-6 Case hardening Steels to EN 10084
1.6587 steel, sometimes referred to as 17CrNiMo6 steel (the old steel number, while the new steel grade in updated standard version is 18CrNimo7-6), is a case-hardening alloy.
AISI 8620 Steel | 1.6523 | 21NiCrMo2 | SNCM220
AISI 8620 Steel is a low alloy nickel, chromium, molybdenum case hardening steel. We supply Schlumberger good quality sae 8620 round bar.
ASTM 4118 Steel | SCM420 | 18CrMo4 | 1.7243
ASTM A29 4118 steel is one popular alloy steel used as engineering steel. There are steel equivalent of aisi 4118 steel, like JIS SCM420, DIN 18CrMo4 steel or 1.7243 steel.