What material is used for the idler wheel of the ZAX350 excavator?

What material is used for the idler wheel of the ZAX350 excavator?

English Translation (Professional Machinery Version for Product Description)

Materials of Idler Wheel for Hitachi ZAX350 Excavator

Idler wheels for Hitachi ZAX350-5G (ZX350-5G) fall into two categories: cast type for general working conditions and forged type for heavy mining applications.

1. Mass-Produced Cast Idler Wheel (Economical for General Construction Sites)

Main Material of Wheel Body

Standard grade: ZG50Mn cast steel (50 manganese cast steel), also referred to as 50Mn cast steel or 35Mn cast steel in the industry.Other common cast steel alternatives: ZG310-570, 45# cast steel, 40Mn2 cast steel.

Heat Treatment

Overall quenching and tempering + medium-frequency induction hardening on the tread surface. Surface hardness: HRC50–56; base hardness: HB230–270.

Material of Matching Shaft

Tempered 45# steel / 40Cr alloy steel with high-frequency hardening for superior wear resistance.

Advantages & Disadvantages

Low cost and high production efficiency. Casting products are prone to porosity and shrinkage defects, with lower compactness and toughness compared with forged idlers. Suitable for earthmoving and light-load working conditions.

2. Heavy-Duty Forged Idler Wheel (High-Strength Durable Type for Mining)

Main Material of Wheel Body

Common grades: 40Mn2, 42CrMo, 35MnB forged alloy steel.Original OEM reinforced parts mostly adopt 42CrMo forged steel, featuring dense grain structure without casting defects, excellent impact resistance and crack resistance.

Heat Treatment

Forged normalizing overall + deep hardening on tread surface, with thicker hardened layer, ideal for long-term rock and heavy-load operations.

3. Original Factory Standard Material for Hitachi ZAX350-5G

The wheel body of original Hitachi idler wheel adopts ZG50Mn high-manganese alloy cast steel; the matching shaft is made of tempered 40Cr alloy steel. Customized original parts for mining are upgraded to 42CrMo forged structure.

English Material Labels for Foreign Trade (Directly Applicable to Product Details)

Cast idler: Material ZG50Mn cast manganese steel, surface induction quenched, hardness HRC50-56

Forged heavy-duty idler: 42CrMo forged alloy steel with deep hardening, suitable for mining conditions

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