Why does the BLM60 bushing achieve the dual performance of wear resistance and corrosion resistance

In high-load plastic extrusion production environments, equipment components face more than just wear and tear—they also withstand constant erosion from corrosive media day in and day out. That’s why we have devoted ourselves to developing the BLM60 nickel-based liner, addressing the industry pain point of being unable to balance wear resistance and corrosion resistance at the root of the alloy composition, and providing a reliable foundation for the long-term stable operation of equipment.

Component Decryption: Every Element of the BLM60 Alloy Has Its Exclusive Core Mission

No redundant components, no compromised ratios—every element in our alloy formula performs its own duty, fully ensuring the implementation of dual protection performance:

The BLM60 breaks the dilemma of "wear-resistant but not corrosion-resistant, or corrosion-resistant but not wear-resistant", achieving both performances.

Most wear-resistant alloys on the market are prone to failure when exposed to corrosive additives; however, the formula design of the BLM60 never requires a choice between wear resistance and corrosion resistance.

1. Nickel Matrix: A Naturally Stable Corrosion-Resistant Base

Nickel itself has excellent acid and alkali corrosion resistance, and extremely strong chemical stability in high-humidity environments, with performance far exceeding that of ordinary iron-based alloys. Its corrosion resistance advantage is particularly prominent in the following working conditions:

PA6/PA66 glass fiber reinforced modified materials

Flame-retardant modified materials (including halogen-containing systems)

Carbon black masterbatches and highly hygroscopic formula materials

High-temperature and high-humidity continuous extrusion production environments

2. High Chromium Content (18.5%): Building a Nanoscale Dense Passive Protective Film

High chromium content is the core key to achieving long-term corrosion resistance.

When the alloy comes into contact with oxygen, chromium will spontaneously form a dense, continuous Cr₂O₃ oxide passive film on the liner surface. This nanoscale protective film can:

Isolate corrosive media from penetrating the matrix and block the corrosion path

Resist pitting and crevice corrosion caused by highly corrosive additives

Withstand high-temperature oxidation during continuous production and maintain stable long-term performance

High-Strength Wear Resistance: Resisting Highly Abrasive Fillers and Extending Equipment Life

The actual service life of the liner depends on its ability to resist abrasive fillers. The BLM60 easily copes with various high-abrasion working conditions through multiple hard phase strengthening mechanisms.

1. Chromium + Carbon Combination: Generating Wear-Resistant Carbide "Micro-Armor"

The precisely proportioned chromium and carbon elements will form high-hardness chromium-based carbides such as Cr₇C₃ and Cr₂₃C₆ inside the alloy. These hard phases, like micro-armor embedded in the matrix, effectively resist the erosion and scratching of various fillers, providing long-term wear protection for:

Glass fiber (GF), carbon fiber

Calcium carbonate (CaCO₃), talc

Magnetic powder, high-mineral filled engineering plastics

It can significantly reduce the wear rate of components.

2. Boron Element (3.2%): Forging the Core of HRC 58-62 High Hardness

Boron is the "secret weapon" for the BLM60 to achieve high hardness. It reacts with chromium and nickel to generate ultra-high hardness borides such as CrB and Ni₃B, whose microhardness is much higher than that of the ordinary matrix. The functions of such hard phases are as follows:

Significantly improve abrasive wear resistance to cope with high-erosion working conditions

Prevent material adhesion and galling damage under high-pressure working conditions

Maintain hardness without attenuation in high-temperature extrusion environments and ensure stable performance

3. Silicon Element: An Easily Overlooked Key to Densification

Although the role of silicon seems low-key, it is crucial to the overall performance:

Reduces the melting point of the alloy and improves the fluidity of the cladding process

Reduces internal porosity and makes the structure denser and more uniform

Reduces the generation of microcracks and eliminates weak breakthroughs for wear and corrosion

The denser the structure, the harder it is for corrosive media to penetrate, and the stronger the wear resistance stability. Silicon also safeguards both wear resistance and corrosion resistance.

Suitable for the Extrusion Industry: BLM60 Liner, Born for Severe Working Conditions

This balanced Ni-Cr-B-Si-C alloy system is fully suitable for the severe working conditions of twin-screw extruders, making it the preferred accessory for high-demand production scenarios:

Superior Wear Resistance: Suitable for glass fiber reinforced, high-mineral filled, and fiber modified plastics

Strong Corrosion Resistance: Suitable for flame-retardant, halogen-containing, and highly hygroscopic corrosive materials

High-Temperature Stability: No softening or performance attenuation during continuous extrusion production.

It is not just an ordinary liner, but a targeted solution—it effectively reduces the frequency of equipment shutdown and replacement, extends the service life of core components, and ensures continuous and stable production under high-corrosion and high-abrasion working conditions.

If you are still struggling with choosing a wear-resistant liner that cannot withstand corrosion, or a corrosion-resistant accessory that wears out frequently, feel free to talk to us. The BLM60 liner balances both wear resistance and corrosion resistance, truly adapting to the severe needs of the extrusion industry.

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