Why use manganese steel to cast mill liners?

Manganese steel, also called Hadfield steel or mangalloy, is a steel alloy containing 12-14% manganese. Renowned for its high impact strength and resistance to abrasion in its hardened state, the steel is often described as the ultimate work hardening steel.

Manganese steel is used for grid liners and generally smaller mills. Its great advantage is that it works hardens under stress, yet the substrate remains tough and can withstand extreme impact without fracture. Its primary disadvantage is that it spreads with impact, so solid liners begin to squeeze together and become extremely difficult to remove, and can damage a mill shell if the stress is allowed to build up to an extreme level.

 

Manganese mill liners chemical composition and mechanical properties

Based on different working conditions and customer inquiries, Qiming Machinery supplies different grades of manganese steel to cast mill liners. The normal manganese steel grades are:

  • Mn14
  • Mn14Cr2
  • Mn18
  • Mn18Cr2

The chemical composition and mechanical properties are shown in the following table:

Manganese Mill Liners Chemical Composition & Mechanical Properties
Product Name Mn14
Performance
Hardness (HB): 255-285 Impact Value (J / cm²)：≥ 155
C Si Mn S P Ni
0.9 – 1.5 0.4 – 0.5 11 – 14 ＜ 0.05 ＜0.04 0.1 – 0.3
Cu Ti V W
0.06 – 0.12 0.06 – 0.12 0.06 – 0.12 0.06 – 0.12
Product Name Mn14Cr2
Performance
Hardness (HB): 265 – 290 Impact Value (J / cm²)：≥ 150
C Si Mn S P Cr
0.9 – 1.5 0.4 – 0.5 11 – 14 ＜ 0.05 ＜0.04 1.5 – 2.5
Cu Ti V W
0.06 – 0.12 0.06 – 0.12 0.06 – 0.12 0.06 – 0.12
Product Name Mn18
Performance
Hardness (HB): 285-315 Impact Value (J / cm²)：≥ 140
C Si Mn S P Cr
0.9 – 1.3 0.3-0.7 16.5-18.5 ＜ 0.05 ＜0.04
Cu Ti V W
0.06 – 0.12 0.06 – 0.12 0.06 – 0.12 0.06 – 0.12
Product Name Mn18Cr2
Performance
Hardness (HB): 200-260 Impact Value (J / cm²)：≥ 140
C Si Mn S P Cr
0.9 – 1.5 0.4 – 0.5 17-19 ＜ 0.05 ＜0.04 1.5 – 2.5
Cu Ti V W
0.06 – 0.12 0.06 – 0.12 0.06 – 0.12 0.06 – 0.12