Editorial Technical Reference

High-Purity Ferromolybdenum Master Alloy

This page explains how High-Purity Ferromolybdenum Master Alloy is classified within Other Basic Metal Production. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

High-purity ferromolybdenum is a master alloy consisting primarily of iron and molybdenum, produced through aluminothermic reduction or electric furnace processes.

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High-Purity Ferromolybdenum Master Alloy in a manufacturing environment
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Product Specifications

Technical details and manufacturing context for High-Purity Ferromolybdenum Master Alloy

Definition
High-purity ferromolybdenum is a master alloy consisting primarily of iron and molybdenum, produced through aluminothermic reduction or electric furnace processes. It serves as a crucial additive in steelmaking to introduce molybdenum, which enhances hardenability, strength at high temperatures, and corrosion resistance. This material is essential for producing alloy steels, stainless steels, and tool steels where precise molybdenum content control is required. Its high purity ensures minimal introduction of unwanted impurities like phosphorus or sulfur into the final steel product. The alloy is available in a molybdenum content range of 60–75% by weight, with maximum impurity limits for silicon (≤1.5%), carbon (≤0.10%), sulfur (≤0.05%), and phosphorus (≤0.05%) as per GB/T 3649. Particle size distribution is 10–100 mm for controlled dissolution. Density ranges from 9.0–9.5 g/cm³, bulk density from 4.5–5.5 g/cm³, and melting point is 1900–2000°C. Moisture content is limited to ≤0.5%. Packaging options include steel drums or woven bags with inner liner, with weights from 25 to 1000 kg. Supply capacity is 500–2000 t/month, with a minimum order quantity of 1 ton. These values are reference ranges and must be confirmed for the specific product model and application. Always verify compliance with the relevant standard and actual specifications with the legal manufacturer or supplier before procurement.
Working Principle
The alloy acts as a carrier that dissolves in molten steel, efficiently and uniformly distributing molybdenum atoms throughout the steel matrix during the alloying process. When added to the melt, the master alloy melts and releases molybdenum, which then integrates into the steel's crystal structure, improving hardenability, high-temperature strength, and corrosion resistance. The high purity of the alloy minimizes the introduction of impurities, ensuring consistent steel quality. The particle size distribution (10–100 mm) is designed to provide controlled dissolution rates, allowing for precise molybdenum content adjustment in the final steel product.
Common Materials
Molybdenum trioxide (MoO3), Iron oxide (Fe2O3), Aluminum powder (reductant)
Technical Parameters
ParameterTypical rangeNotes & selection driver
Molybdenum ContentRequired60–75 %Percentage of molybdenum by weight in the alloyGB/T 3649
Silicon ContentRequired≤1.5 %Maximum silicon impurity levelGB/T 3649
Carbon ContentRequired≤0.10 %Maximum carbon impurity levelGB/T 3649
Sulfur ContentRequired≤0.05 %Maximum sulfur impurity levelGB/T 3649
Phosphorus ContentRequired≤0.05 %Maximum phosphorus impurity levelGB/T 3649
Particle Size Distribution10–100 mmSize range of alloy pieces for controlled dissolutionGB/T 3649
Density9.0–9.5 g/cm³Affects packing and melting behavior.
Melting Point1900–2000 °CHigh melting point requires high furnace temperatures.
Bulk Density4.5–5.5 g/cm³Important for charging calculations.
Moisture Content≤0.5 %High moisture can cause spattering.
Packaging25–1000 kgSteel drums or woven bags with inner liner.
Supply Capacity500–2000 t/monthMinimum order quantity 1 ton.

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM
  • Molybdenum Matrix Part
    Primary alloying element providing enhanced properties
    Material: Molybdenum atoms in iron lattice
  • Iron Carrier Part
    Base metal facilitating dissolution in molten steel
    Material: Pure iron
  • Reduction Byproducts Optional Part
    Slag residues from production process
    Material: Aluminum oxide and other oxides

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for High-Purity Ferromolybdenum Master Alloy.

FeMo master alloy Molybdenum ferroalloy Ferro-molybdenum additive Steel alloying FeMo

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Atmospheric to 1 bar (standard ladle addition)
flow rate: Batch addition - not applicable
temperature: Ambient to 1600°C (melting point dependent on steel grade)
slurry concentration: Solid alloy addition - not applicable
Media Compatibility
✓ Basic oxygen furnace (BOF) steelmaking ✓ Electric arc furnace (EAF) steel production ✓ Secondary ladle metallurgy processes
Unsuitable: Acidic environments or chloride-containing molten metals
Sizing Data Required
  • Target molybdenum content in final steel (%)
  • Batch size of molten steel (tons)
  • Required molybdenum recovery rate (%)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Oxidation-induced embrittlement
Cause: Exposure to oxygen at high temperatures during processing or storage, leading to formation of brittle oxide phases that reduce ductility and cause cracking under thermal or mechanical stress.
Thermal fatigue cracking
Cause: Repeated thermal cycling during alloying processes (e.g., in electric arc furnaces) creates stress concentrations at grain boundaries and inclusions, propagating microcracks that compromise structural integrity.
Maintenance Indicators
  • Visible surface discoloration or powdery white/gray oxide layer formation on alloy surfaces
  • Audible popping or cracking sounds during heating/cooling cycles indicating internal stress relief or crack propagation
Engineering Tips
  • Implement controlled atmosphere storage (argon/nitrogen blanketing) and processing to minimize oxygen exposure, maintaining oxygen levels below 50 ppm during critical operations.
  • Optimize thermal profiles during alloy production to reduce thermal gradients, incorporating gradual heating/cooling rates (max 100°C/hour) and intermediate temperature holds to relieve residual stresses.

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
ASTM A132 - Standard Specification for Ferromolybdenum ISO 5452 - Ferromolybdenum - Specification and conditions of delivery DIN 17561 - Ferromolybdenum - Chemical composition and delivery conditions

Quoted from the published standard.

Manufacturing Precision
  • Molybdenum content: +/- 0.5%
  • Particle size distribution: +/- 5% of specified mesh range
Quality Inspection
  • Spectrographic Analysis for chemical composition verification
  • X-ray Fluorescence (XRF) for elemental purity confirmation

Manufacturers of High-Purity Ferromolybdenum Master Alloy

Manufacturer profiles associated with High-Purity Ferromolybdenum Master Alloy.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review · Page last updated 6 September 2026

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Frequently Asked Questions

What is the typical molybdenum content in this ferromolybdenum master alloy?

The molybdenum content is typically in the range of 60–75% by weight, as specified in the reference data. However, the exact value for a specific product should be confirmed with the supplier.

What are the maximum impurity levels for silicon, carbon, sulfur, and phosphorus?

According to the reference data, maximum impurity levels are: silicon ≤1.5%, carbon ≤0.10%, sulfur ≤0.05%, and phosphorus ≤0.05%. These are based on GB/T 3649 and should be verified for the specific product.

What is the particle size distribution of the alloy?

The particle size distribution is 10–100 mm, which is designed for controlled dissolution in molten steel. Confirm the exact size range with the supplier for your application.

How is the alloy packaged and what is the supply capacity?

Packaging options include steel drums or woven bags with inner liner, with weights from 25 to 1000 kg. Supply capacity is 500–2000 t/month, with a minimum order quantity of 1 ton. These details should be confirmed with the supplier.

Data basis: editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification
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