27Mn2 carbon manganese steel

Introduction

We manufacture forging ingots, billets, and blooms in carbon manganese steel specifically for 27Mn2, as listed under carbon manganese steel in the ksl steel grades family. 27Mn2 is a medium carbon, high-manganese steel known for its good strength, excellent toughness, and improved hardenability compared to plain carbon steels. It is suitable for automotive, general engineering, and forged components subjected to moderate to high mechanical loads. The high manganese content enhances hardenability, impact strength, and wear resistance. 27Mn2 exhibits good machinability in the annealed or normalized condition and maintains dimensional stability after heat treatment, making it ideal for forging and machining applications. This grade provides a cost-effective balance of mechanical performance, durability, and processability.

Chemical composition

Element Content (%) Function / effect
Carbon (c) 0.24 – 0.30 Provides strength and moderate hardness
Manganese (mn) 1.40 – 1.80 Improves hardenability, toughness, and wear resistance
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: 650 – 850 MPa
  • Yield strength: 400 – 550 MPa
  • Hardness: 180 – 240 HB (as rolled / normalized)
  • Impact toughness: Good
  • Fatigue resistance: Good

Heat treatment

  • Annealing: improves machinability and reduces internal stresses
  • Normalizing: refines grain structure and improves mechanical properties
  • Quenching & tempering: optional, for applications requiring higher strength and hardness

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

Key features and benefits

  • Higher strength than standard carbon steels
  • Excellent toughness and impact resistance
  • Improved hardenability due to high manganese content
  • Good machinability in annealed / normalized condition
  • Dimensional stability after heat treatment
  • Suitable for forging and machining processes
  • Cost-effective engineering steel

Typical applications

  • Shafts and axles
  • Automotive components
  • Forged engineering parts
  • Pins, bolts, and mechanical fasteners
  • General structural and load-bearing components

Equivalent steel grades

27Mn2 is commonly referenced as:

  • En 10083 – 27Mn2
  • Din 1.1173 (approximate)
  • No direct SAE / aisi equivalent (used as high-manganese carbon steel)

Why choose 27Mn2 for your application?

27Mn2 offers a practical combination of strength, toughness, and cost efficiency. Its high manganese content enhances hardenability and impact performance, making it suitable for dynamic and moderately heavy-duty applications. Good machinability and forgeability help reduce manufacturing costs while ensuring reliable performance.

Comparison table for similar grades

Grade Carbon (%) Key applications Heat treatment Comments
27Mn2 0.24–0.30 Shafts, forgings, engineering parts Normalizing / q&t Good strength & toughness
En15 0.30–0.40 General engineering Normalizing Lower mn content
37Mn2 0.34–0.40 Heavy-duty parts Q&t Higher strength
SAE 1541 0.36–0.44 Fasteners, bolts Cold heading High-mn fastener steel

Summary

27Mn2 is a versatile carbon manganese steel listed in the ksl steel grades family, suitable for a wide range of engineering and automotive applications. It provides consistent mechanical performance, easy processability, and excellent value.