Wood Mold Sand Casting — High Manganese Steel Crusher Parts

High manganese steel grades: XT510, XT520, XT610, XT710, XT720, M1, M2, M7, M9, Mn13Cr2, Mn18Cr2, Mn22Cr2, Mn22Cr2Mo.

Material properties

Work hardening — As-cast hardness ~200 HB. Under impact, the surface layer transforms to martensite, reaching 500–550 HB while the core remains ductile. This means the part gets harder the more it works.

Impact toughness — Charpy V-notch typically 100–150 J at room temperature. Resists cracking under sudden shock loads from oversize feed or tramp metal.

Grade comparison — Mn13Cr2, Mn18Cr2, Mn21Cr2, Mn22Cr2Mo

* Relative to Mn13Cr2 baseline. Actual values vary with feed material and crushing conditions.

How to choose the right grade

Mn13Cr2 — Entry-level manganese steel. Use for limestone, dolomite, and soft aggregates where cost per ton is the priority. Adequate for secondary crushing where impact is moderate.

Mn18Cr2 — The workhorse. 30–50% longer wear life than Mn13Cr2 in granite, basalt, and quartzite. Higher manganese content means a deeper work-hardened layer — important on large castings where through-thickness wear is significant. Recommended for most quarry jaw and cone applications.

Mn21Cr2 — For abrasive ores. The extra manganese pushes work-hardened hardness above 520 HB. Use in primary gyratory concaves, iron ore crushing, and high-silica aggregates. The trade-off: slightly lower impact toughness than Mn18Cr2 — avoid in applications with frequent tramp metal.

Mn22Cr2Mo — Maximum wear resistance. Molybdenum addition improves yield strength at elevated temperature and refines grain structure. 80–120% longer life than Mn13Cr2. Best for: gyratory crusher concaves, primary jaw plates in hard rock, hammer mill liners with high impact + high abrasion. Higher cost — justified when changeout downtime is expensive.

Rule of thumb: If you're changing liners more than once a month, move up a grade. The extra material cost is dwarfed by the savings in downtime and labor.

Cast parts

Jaw plates, mantles, bowl liners, concaves — Work-hardening surface handles impact + abrasion. Most common application for manganese steel in crushing.

Hammer heads — For hammer mills and impact crushers. Manganese steel absorbs impact energy without fracturing. Best suited for feed sizes above 150 mm where impact is high.

Liner plates, wear plates, cheek plates — Protect crusher frames, feed chutes, and discharge points from direct material contact. Bolt-on, replaceable.

Wood mold sand casting tolerances: ±1.5 mm for dimensions under 500 mm, ±3 mm for 500–2000 mm. Surface finish Ra 12.5–25 µm as-cast.