Created on 08.21

TBM Cutting Tool Material Introduction

The selection of tool materials for TBM (Tunnel Boring Machine) cutting tools is primarily determined by the wear characteristics of the ground strata (e.g., "high-hardness abrasive wear" versus "impact wear" in hard rock); the key consideration is balancing "high-hardness wear resistance" with "high-toughness fracture resistance." The core cutting tool used in a TBM is the disc cutter, and its materials are mainly categorized into cutter ring material, cutter body material, bearing material, and surface-hardening material, as detailed below:

1. Blade Ring Material (Core Load-Bearing Component)

The cutting ring is subjected directly to high-pressure compression and high-frequency impacts from the rock; therefore, its material must possess extremely high hardness, wear resistance, and impact resistance. Common materials include:

Hot-work die steel: e.g., H13 (4Cr5MoSiV1) and its improved grades (e.g., Cr8Mo2SiV). With a hardness ranging from 55 to 60 HRC, this steel offers good toughness and resistance to both cold and high-temperature wear; it is suitable for applications requiring medium hardness and uniform geological conditions.

Cold-work die steel: e.g., DC53, DJ-1, etc. With a hardness ranging from 59 to 62 HRC and exceptional wear resistance, this steel is suitable for applications involving highly abrasive rocks or soft rock conditions; its impact resistance exceeds that of conventional hot-work die steels.

Powder metallurgy high-speed steel: e.g., SAM23. Compared to conventional high-speed steel, it offers higher strength, hardness, toughness, and wear resistance, making it suitable for complex geological environments characterized by high hardness and severe wear.

Hard alloy (tungsten carbide, WC): e.g., fully sintered tungsten carbide (WC content> 90%) or a "high-strength alloy steel matrix + tungsten carbide reinforcement layer." The hardness can reach HRC 60–65, offering exceptional resistance to abrasive wear; it is suitable for extremely hard rocks (e.g., granite) or highly abrasive geological formations.

Gradient performance/Composite materials: e.g., gradient-hardness cutting rings (high edge hardness combined with excellent core toughness) or centrifugally cast/melted-coated materials (e.g., H13 steel with tungsten carbide particles, or surface laser/plasma-coated tungsten carbide layers); these composite materials enhance overall performance and are suitable for complex or extremely harsh geological conditions.

2. Blade material (main structure)

Low-alloy high-strength steel: e.g., 40CrNiMo, 9Cr2Mo, etc. These steels possess excellent overall toughness (high impact energy) and strength, enabling them to withstand accidental impacts from hard interlayers such as gravel and preventing cracking of the cutting tool body.

3. Bearings and sealing materials (auxiliary components)

Bearing material: High-carbon chromium bearing steel (e.g., GCr15), designed to withstand both radial and axial loads transmitted by the cutter ring; paired with high-temperature lubricant to withstand the high temperatures generated by friction on the cutter disc.

Sealing material: Nitrile rubber, fluororubber, etc., used to prevent rock powder and impurities from entering the bearing, thereby ensuring the bearing's service life.

Note: The TBM tool material should be selected based on specific geological conditions (rock hardness, abrasiveness, and impact loads) to achieve optimal excavation efficiency and tool service life.

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