Hot Rolled Low Alloy Steel with High Strength, Impact Toughness and Abrasion Resistance

Low-cost hot-rolled steel with better abrasion resistance for import substitution

Components experiencing abrasive wear, particularly in the areas of mining, earth-moving, excavation, transportation, agriculture and mineral processing. Some of the examples include buckets of earth-moving machinery, tipper bodies, concrete mixers, etc.

Salient Technical Features: 

• The proposed heat-treatment utilizes the heat remaining with the hot-rolled coil to achieve the desired microstructure and hence, can negate the tempering and/or isothermal partitioning treatment.
• The developed alloys contain low alloying additions and hence, good weldability, and are easy to fabricate.
• Novel multiphase microstructure with optimized fraction, composition, size, and morphology of various microstructural constituents.
• The developed alloys exhibit superior wear resistance and strength, along with comparable impact toughness to the commercial alloy.

• Mechanical Properties	NML Developed alloy	Commercial Grade (Imported)
  Hardness (HV-1)	372-478	415-427
  Yield Strength (MPa)	1063-1201	954-1018
  Ultimate Tensile Strength (MPa)	1139-1415	1192-1257
  Total elongation (%)	6.4-10.1	15-16
  Charpy Impact toughness at Room temperature (J/cm2)	68-84	83-95
  Charpy Impact toughness at -40°C (J/cm2)	44-80	23-34
  Abrasive Wear volume loss (mm3)	106-116	231-269

• Easy to weld and fabricate due to low alloying
• No requirement of tempering and/or isothermal partitioning treatment and hence, reduced cost of the production
• High strength along with better abrasion resistance will improve the service life of components and reduce the downtime associated with maintenance
• Elimination of import of costly steel and possible export in future
• In-house manufacturing of mining component from developed steel, leading to leveraging of the Indian industries from a global perspective