High-precision cast iron parts
High-precision cast iron parts
High-precision cast iron parts
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  • High-precision cast iron parts
  • High-precision cast iron parts
  • High-precision cast iron parts

I. Introduction to High-Forged Cast Iron Parts

High-chromium cast iron is a wear-resistant alloy cast iron characterized primarily by its high chromium content (typically ≥11%). With its ultra-high hardness, excellent wear resistance, and moderate corrosion resistance, it has become the material of choice for industries such as mining, cement, and power generation—fields that face extremely demanding wear conditions.

Ingredients and Organization

Element

Typical Content

Core Role

Chromium (Cr)

11–30%

Forming M₇C₃-type carbides (hardness HV1500-1800), which create a wear-resistant skeleton and enhance the corrosion resistance of the matrix.

Carbon (C)

2.0–3.5%

When combined with chromium to form carbides, the higher the content, the greater the wear resistance (though brittleness also increases).

Molybdenum (Mo)

0.5–3.0%

Refine grain size, suppress high-temperature pearlite transformation, and enhance hardenability (essential for thick-walled components).

Copper (Cu)

0.5–1.5%

Replace molybdenum to reduce costs and enhance corrosion resistance (especially in acidic conditions).

Nickel (Ni)

0.5–1.5%

Stabilizes austenite and enhances toughness (in synergy with molybdenum)

Manganese/Silicon

≤1.5%

Deoxygenation and flow control—excess can reduce toughness.

II. Advantages

Wear Resistance Benchmark: Under abrasive wear conditions, its service life is 3 to 5 times longer than that of high-manganese steel and more than twice as long as ordinary white cast iron. The M₇C₃ carbide boasts a hardness nearly equivalent to corundum abrasive (Al₂O₃), making it highly resistant to quartz abrasion (hardness HV1000–1200).

Corrosion and wear resistance: When the Cr content is ≥20%, the material exhibits significantly superior corrosion resistance compared to low-alloy steel in pulp with pH values ranging from 3 to 12.

High-temperature stability: Hardness remains virtually unchanged below 600°C (outperforming most wear-resistant steels)

III. Key Control Points in Manufacturing Processes

1. Casting Process

Melting: Medium-Frequency Induction Furnace + Argon Deoxidization (reduces slag inclusion)

Pouring: Use low-temperature, rapid pouring (1380–1420°C) to prevent chromium oxidation.

Chill design: Must use insulated chills combined with a heating agent to compensate for the high-chromium iron's shrinkage rate (≈2.1%).

2. Heat Treatment Core

Phase

Process parameters

Purpose

Equipment Requirements

Softening Annealing

950℃ × 4h → Furnace cool to 700℃

Eliminate casting stress—preparing for machining

Controllable Atmosphere Furnace

Quenching

980-1050℃ × 2-4h → Air cooling/Oil cooling

The matrix transforms into martensite, achieving high hardness.

Precise temperature control (±10℃)

Tempering

200–450°C × 4–8 hours

Eliminate quenching stress and adjust toughness.

Avoid the 450-550℃ brittle zone

Warning: Thick-walled components (>100mm) must undergo stepwise heating (300°C/h); otherwise, cracking is inevitable!

IV. Typical Application Scenarios and Failure Analysis

Major application areas: High-chromium cast iron components are widely used in mining, cement production, power generation, road construction machinery, and refractory materials. Since the 1980s, they have also been increasingly employed in manufacturing the chambers of shot blasting machines, as well as in producing shot blaster blades and lining plates—effectively preventing high-speed, densely packed shot streams from penetrating the steel shell. Meanwhile, these materials find extensive applications in fields such as construction, power generation, and mining as well.

Typical application example: As a highly wear-resistant material, it has been effectively used in mechanical and metallurgical equipment such as crushers, grinders, and material-handling systems. It is particularly widely applied to components subjected to abrasive and impact wear, including crusher rollers, hopper liners, blast-furnace charging chutes,料斗 (hoppers), coal-conveying trough linings, roller casings for coal mills, rolling rolls, and flow-path components of slurry pumps. For instance, the high-chromium grooved liners installed at Henan Xiangshan Group (formerly Henan Yanshi Cement Plant) in early 1988 have operated successfully for 12 years, significantly reducing the plant’s costs and minimizing the frequency of liner replacements.

Keywords

Previous: High-manganese steel product series

Next： Low-carbon martensitic steel jaw plate

High-precision cast iron parts
High-precision cast iron parts
High-precision cast iron parts
+
  • High-precision cast iron parts
  • High-precision cast iron parts
  • High-precision cast iron parts

High-precision cast iron parts

Our company specializes in the production of wear-resistant castings for crushing and grinding equipment, as well as main bearing shells and thrust blocks for mills of various specifications.

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