High Carbon & Alloy Steel | EN8 – EN9 – EN24

EN8 – ’40’ Carbon Steel

Suitable in the hardened and tempered condition for tensile ranges of 40/50, and 45/55 tons/sq. in.

C. Si. Mn. S. P.
min. 0.35% 0.05% 0.60%
max. 0.45% 0.35% 1.00% 0.060% 0.060%

EN9 – ’55’ Carbon Steel

Flat Hexagonal Octagonal Round Square

Suitable in the hardened and tempered condition for tensile ranges of 45/55, 50/60 and 55/65 tons/sq. in.

C. Si. Mn. S. P.
min. 0.50% 0.05% 0.50%
max. 0.60% 0.35% 0.80% 0.060% 0.060%

EN24 – 1.5% Nickel-Chromium-Molybdenum Steel

Flat Hexagonal Round

Suitable for tensile ranges of 50/60, 55/65, 60/70, 65/75, 70/80, 75/85, 80/90 and 100 tons/sq. in.

C. Si. Mn. Ni. Cr. Mo. S. P.
min. 0.35% 0.10% 0.45% 1.30% 0.90% 0.20%
max. 0.45% 0.35% 0.70% 1.80% 1.40% 0.35% 0.050% 0.050%

 

Description

Alloy steel is steel alloyed with other elements in amounts of between 1 and 50% by weight to improve its mechanical properties. Alloy steels are broken down into two groups: low alloy steels and high alloy steels. Low alloy steels are defined as having an alloy contents between 1 and 4% and high alloy steels have 4 to 50% alloying contents. However, most commonly alloy steel refers to low alloy steel.

These steels have greater strength, hardness, hot hardness, wear resistance, hardenability, or toughness compared to carbon steel. However, they may require heat treatment in order to achieve such properties. Common alloying elements are molybdenum, manganese, nickel, chromium, vanadium, silicon and boron.