En15 carbon steel

Introduction

we manufacture forging ingots, billets, and blooms in carbon steel specifically for En15, as listed under carbon manganese steel in the ksl steel grades family. En15 is a medium carbon steel known for its good strength, toughness, and excellent machinability. It is widely used in general engineering and automotive applications where moderate mechanical properties, good impact resistance, and cost effectiveness are required. En15 performs well in annealed, normalized, and heat-treated conditions and maintains dimensional stability after heat treatment, making it suitable for forging and precision machining operations. This grade provides a reliable and economical solution for a wide range of engineering applications.

Chemical composition

Element	Content (%)	Function / effect
Carbon (c)	0.30 – 0.40	Provides strength and hardness
Manganese (mn)	0.60 – 0.90	Improves toughness and hardenability
Silicon (si)	0.10 – 0.35	Increases strength and elasticity
Phosphorus (p)	Max 0.035	Impurity; controlled for better toughness
Sulphur (s)	Max 0.035	Impurity; controlled for machinability
Iron (fe)	Balance	Base metal

Mechanical properties (typical, depending on condition & heat treatment)

• Tensile strength: 600 – 750 MPa
• Yield strength: 350 – 450 MPa
• Hardness: 170 – 220 hb (annealed / normalized)
• Impact toughness: good
• Fatigue resistance: moderate

Heat treatment

• Annealing: improves machinability and relieves internal stresses
• Normalizing: improves strength and grain structure
• Quenching & tempering: can be applied to achieve higher strength and hardness

Heat treatment parameters can be tailored based on end-use requirements.

Key features and benefits

• Good balance of strength and toughness
• Excellent machinability
• Cost-effective engineering steel
• Good forgeability
• Dimensional stability after heat treatment
• Suitable for machining and forging applications

Typical applications

• Shafts and axles
• General engineering components
• Forged parts
• Pins, bolts, and mechanical fasteners
• Automotive components

Equivalent steel grades "En15" is commonly referenced as

• Din c40 (approximate)
• Is 1570 gr 40c8 (approximate)
• SAE 1040 (approximate)

Why choose En15 for your application?

En15 offers a practical combination of strength, toughness, and machinability at a competitive cost. Its reliable Mechanical properties and flexibility in heat treatment make it a preferred choice for general engineering and automotive components.

Comparison table for similar grades

Grade	Carbon (%)	Key applications	Heat treatment	Comments
En15	0.30–0.40	General engineering	Normalizing / q&t	Good machinability
27Mn2	0.24–0.30	Forgings, shafts	Normalizing	Higher mn content
En15A	0.30–0.40	Machined parts	Normalizing	Process consistency
SAE 1541	0.36–0.44	Fasteners	Cold heading	High mn steel

Summary

En15 is a trusted medium carbon steel listed in the ksl steel grades family, suitable for a wide range of engineering applications. It delivers consistent performance, good processability, and excellent value.