1. Introduction to Low Carbon Martensitic Steel Jaw Plates
Low carbon martensitic steel jaw plates are the core wear-resistant components of jaw crushers. By optimizing material composition and heat treatment processes, they achieve a breakthrough balance between high hardness, high toughness, and weldability, becoming a revolutionary material in the crushing field of medium to high hardness ores (compressive strength ≤ 250MPa).
Performance Dimensions |
High Manganese Steel Jaw Plates (Mn13) |
Low Carbon Martensitic Steel Jaw Plates |
Core Advantages |
Initial Hardness |
HB180-220 (Unhardened) |
HB400-480 (Hardened at factory) |
No need for impact hardening, no failure under low working conditions |
Wear Resistance Mechanism |
Relies on impact surface hardening (HB500+) |
Uniform high hardness throughout the cross-section |
Service life increased by 1.5-3 times |
Impact Toughness |
≥100J (Extremely high) |
40-80J (Scientifically matched to requirements) |
Meets crack resistance requirements, avoids over-design |
Weldability |
Very poor (carbon equivalent > 1.8%) |
Excellent (carbon equivalent 0.4-0.6%) |
Supports on-site overlay welding repair |
Comprehensive Cost |
Low unit price, short service life |
High unit price, but ore cost per ton reduced by 30% |
Significant long-term benefits |
2. Performance Characteristics
The core performance advantages stem from a unique microstructure. The martensitic structure is formed by quenching from high-temperature austenite, featuring a highly oriented crystal structure that combines high strength, hardness, and good toughness. Compared with traditional high-carbon martensite, low carbon martensitic steel achieves a balance of strength and plasticity by optimizing carbon content and quenching processes, while also offering corrosion resistance, wear resistance, and lightweight properties, meeting stringent comprehensive material performance requirements across multiple fields.
3. Key Points of Production Process
1. Smelting and Casting
Purity control: Electric furnace + LF refining to reduce S and P content (S ≤ 0.015%, P ≤ 0.025%).
Riser optimization: Computer simulation of solidification process to prevent shrinkage porosity (jaw plate stress concentration areas must be dense).
2. Heat Treatment Process
Quenching cooling rate: Must avoid bainite transformation (which affects toughness); accelerated cooling required for thick sections.
Tempering control: Maintain martensitic strength while relieving stress, avoid excessive tempering softening.
4. Typical Application Fields of Low Carbon Martensitic Steel
Automotive Industry: Used for manufacturing wheels, chassis, body structures, and high-strength bolts, reducing vehicle weight, improving fuel economy, and lowering carbon emissions, while meeting impact and wear resistance requirements.
Construction and Bridge Engineering: With high strength and weather resistance, suitable for load-bearing structures and bridge construction; lightweight properties reduce structural weight.
Shipbuilding: Its high strength, toughness, and corrosion resistance meet ship pressure, impact resistance, and extended service life requirements.
Aerospace: Due to high strength, light weight, high temperature resistance, and corrosion resistance, it is a key material for aerospace structures.
Mold Manufacturing: Such as ultra-low carbon cold extrusion plastic mold steel (e.g., domestic 06 steel), which can shorten mold manufacturing cycles, reduce costs, and improve service life.
Keywords
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Low-carbon martensitic steel jaw plate
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