2026-10-09

There Is No Best Material, Only a Matching One

A wear part does not have a best material. It has a material that fits the job. High manganese steel and high-chromium cast iron are both used in crushers, and the choice between them is not a ranking. It is a match: the material has to suit the crushing stage, the feed, and the impact the part will actually take. The sections below set out what each material does well, where each one fits, and the questions to answer before you order.

There is no best material for wear parts, only a material that matches the application.

High Manganese Steel: Work Hardening Under Impact

The property that defines high manganese steel is work hardening. The surface hardens as it is hit. The greater the impact, the harder the surface becomes, while the core stays tough.

That is why high manganese steel suits coarse crushing: large feed lumps and high impact. Jaw plates, cone crusher liners and hammer crusher hammers can all be made in high manganese steel. These are positions where the part is struck hard, which is what brings the hardened surface up.

High-Chromium Cast Iron: Hardness, With a Limit on Impact

High-chromium cast iron takes the opposite approach. Hardness is high: HRC 56–58. Wear resistance is outstanding. What the material does not handle is large impact. Put it where the feed is controlled — medium and fine crushing — and it performs. Put it where oversized lumps are hitting it, and the impact side of the application becomes the problem.

Where the application fits, the gain in wear life is significant. High-chromium alloy blow bars last 3–5 times longer than conventional materials.

The Casting Process Is Part of the Material

Two parts can carry the same material name and still deliver very different service life. The casting process is a large part of the reason. Our lost foam casting process is patented. It makes castings denser inside. Internal density has a direct effect on how long a wear part actually lasts.

So when a quotation names high chromium, that is the start of the question, not the end of it. The casting process behind the part is part of what you are buying.

Three Questions to Answer Before You Select

Before choosing between high manganese steel and high chromium, answer three questions about the application:

  • How hard is the material? The rock type tells you.
  • What is the feed size?
  • Is there any uncrushable material in the feed?

The answers point to the material. A hard, controlled, medium-to-fine feed lines up with high chromium. A coarse feed with large lumps and heavy impact lines up with high manganese steel. If the feed cannot be controlled, deal with that first. The material choice comes after.

Service Life Reference

One reference point, for jaw plates. On soft rock, a jaw plate runs about 2 years. On hard rock, the same jaw plate runs 6 months to 1 year. The working condition drives the difference.

Conclusion

Coarse crushing: high manganese steel. Medium and fine crushing: high chromium. If the feed cannot be controlled, solve the feed first, and only then discuss material.