Coarse Grains

Silicon Carbide Lump

Functional Coarse Particles for Industrial Structure

Crushed and screened from qualified SiC lumps, these 1–5mm angular grains serve structural roles in refractory castables, metallurgical processing, and advanced ceramics—not surface finishing like grit or powder.

1–5 mm Particle Size

86–99% SiC Purity Range

Mohs 9.2 Hardness

3 Grades Available Options

Request Free Sample → Explore Products ↓

Form 01

SiC Lump

Raw furnace blocks

≥50 mm

Form 02

SiC Grain

Crushed coarse grains

1–5 mm

Form 03

SiC Grit

FEPA-graded abrasive

0.1–1 mm

Form 04

SiC Powder

Micro-powders

F8–F1500

Grade Options

Choose the Right Grade for Your Application

FerrumX offers three distinct SiC grain grades, each optimized for its target industry’s chemistry and performance requirements.

86–90% SiC

Metallurgical

Deoxidation & Slag Conditioning

Higher free carbon and Fe₂O₃ tolerance. Optimized for simultaneous Si and C recovery in induction furnaces, ladle furnaces, and BOF converters.

SiC Content 86–90%

F.C. Max ≤3–6%

Fe₂O₃ Max ≤3.5%

Size Range 1–5 mm

Color Color

Best for:

· Steel deoxidation · Slag conditioning · Si/C alloying · BOF exothermic agent

90–97% SiC

Refractory

Castables & Ramming Mixes

Balanced purity for refractory formulations requiring controlled chemistry and high thermal stability. Ideal for shaped and unshaped refractory products.

SiC Content 90–97%

F.C. Max ≤1–2.5%

Fe₂O₃ Max ≤1.2–3.5%

Size Range 1–3mm, 1–5mm

Color Black

Best for:

· SiC bricks · Castables · Si/C alloying · Ramming mixes · Tap hole clay · Kiln furniture

97–99% SiC

Abrasive

Deoxidation & Slag Conditioning

Higher free carbon and Fe₂O₃ tolerance. Optimized for simultaneous Si and C recovery in induction furnaces, ladle furnaces, and BOF converters.

SiC Content 97–99%

F.C. Max ≤0.3–1%

Fe₂O₃ Max ≤0.8-1.2%

Size Range 1–3 mm, 1–5 mm

Color Black / Green

Best for:

· Bonded grinding wheels · SiC ceramic plates · Thin plates · Custom-shaped components

Size Range Options

Three primary size ranges for different functional requirements. Coarser grains for structural roles; finer grains for castable formulations.

1–3 mm Fine Grains

Castable formulations · Ceramic thin plates · Functional filler

1–5 mm Standard Grains

Refractory castables · Metallurgical additives · SiC bricks

3–5 mm Coarse Grains

Structural refractory · Wear-resistant components · SiC-based shapes

Technical Specifications

Parameter	Specification	Industrial Significance
Product Type	SiC Grains / Coarse Grains / Granules	Intermediate form between lumps and grit
Particle Size	1–5 mm (1–3mm, 3–5mm available)	Coarser than grit—for structural roles, not surface finishing
Available Grades	Metallurgical / Refractory / Abrasive	Three grade options match different purity needs
SiC Content	86–99% (depending on grade)	Higher purity = better refractory performance; lower = cost-effective for metallurgy
Grain Shape	Angular, sharp-edged	Shell-like fracture creates continuous new cutting edges
Mohs Hardness	9.2	Excellent wear resistance in refractory and ceramic matrices
Thermal Conductivity	High (50–100 W/m·K)	Critical for refractory heat transfer efficiency
Thermal Expansion	Low	Resists thermal shock in furnace environments
Chemical Stability	Excellent	Resists corrosive slag and gas attack at high temperature
Production Process	Crushed & screened from SiC lumps	Preserves angular morphology through controlled crushing
Applicable Standards	GB / FEPA / JIS (available upon request)	Flexible standard compliance for global customers

Why Angular Grains Matter

Angular

Self-Sharpening Fracture

Shell-like fracture behavior generates new sharp cutting edges under stress. Angular SiC grains maintain aggressive cutting action over extended use, unlike rounded grains that dull quickly.

High

Thermal & Chemical Stability

High thermal conductivity, low expansion, and outstanding chemical inertness. SiC grains perform reliably under corrosive, high-temperature conditions in refractory and metallurgical environments.

Stable PSD

Controlled Size Distribution

Multi-stage crushing and calibrated sieving ensure consistent particle size distribution across 1–5mm ranges. Oversized and undersized particles are removed for predictable batch-to-batch performance.

Primary Applications

Refractory

SiC Bricks, Plates & Castables

Silicon carbide grains are widely used in shaped and unshaped refractory products—SiC bricks, plates, special-shaped components, castables, and ramming mixes—due to high thermal conductivity and thermal shock resistance.

SiC for Refractories

Metallurgical

Deoxidation & Slag Conditioning

In metallurgical processes, SiC grains serve as functional additives for simultaneous Si and C recovery, slag conditioning, and high-temperature performance enhancement in steelmaking.

Metallurgical SiC

Ceramics

Advanced Ceramic Components

Coarse SiC grains are applied in production of high-end silicon carbide ceramic products—including thin plates and custom-shaped components requiring controlled grain size and consistent chemistry.

Black SiC

Why Choose FerrumX SiC Grains

⬡

Angular Morphology

Shell-like fracture produces sharp-edged grains that self-sharpen during use—maintaining cutting efficiency over extended service life.

📊

Three Grade Options

Metallurgical (86–90%), Refractory (90–97%), and Abrasive (97–99%)—each grade engineered for its target application’s requirements.

📐

Consistent PSD

Multi-stage crushing + calibrated sieving = stable particle size distribution. Oversized and undersized particles are removed for batch consistency.

🔥

Thermal Stability

High thermal conductivity and low expansion make SiC grains reliable in furnace, refractory, and metallurgical environments up to 1,900°C.

🏭

Integrated Supply Chain

Lump → Grain → Grit → Powder, all under FerrumX control. Traceability from furnace to delivery, with COA per shipment.

FAQ

Frequently Asked Questions

Q1: What are silicon carbide grains and how are they made?

Silicon carbide grains are coarse, angular SiC particles in the 1–5mm size range, produced by crushing and screening pre-qualified silicon carbide lumps from the Acheson furnace. Multi-stage crushing preserves the sharp angular grain structure while controlled sieving separates grains into defined size ranges (1–3mm, 1–5mm, 3–5mm). Unlike SiC grit (0.1–1mm, FEPA graded), grains are designed for structural and functional roles rather than surface finishing.

Q2: What grade options are available for SiC grains?

FerrumX offers three grade options: Metallurgical Grade (86–90% SiC, higher free carbon and Fe₂O₃ tolerance, for deoxidation and slag conditioning in steelmaking), Refractory Grade (90–97% SiC, balanced purity for castables, ramming mixes, and SiC bricks), and Abrasive Grade (97–99% SiC, highest purity for bonded abrasive products and advanced ceramics). Each grade is optimized for its target application’s chemistry and performance requirements.

Q3: What size ranges do SiC grains come in?

FerrumX supplies SiC grains in three primary size ranges: 1–3mm (finer grains for castable formulations and ceramic components), 1–5mm (the standard range for refractory and metallurgical applications), and 3–5mm (coarser grains for structural refractory products and SiC bricks). Custom size distributions are available on request.

Q4: How do SiC grains differ from SiC grit and powder?

SiC grains (1–5mm) are coarser than grit (0.1–1mm) and much coarser than powder (sub-100μm). Grains serve structural and functional roles—refractory aggregate, metallurgical additive, ceramic component feedstock—while grit is designed for surface treatment (grinding, blasting) and powder for precision finishing. The SiC product chain flows: Lump (≥50mm) → Grain (1–5mm) → Grit (0.1–1mm) → Powder (micron-level).

Q5: What are the self-sharpening properties of SiC grains?

Silicon carbide grains exhibit shell-like fracture behavior—when mechanical stress exceeds the fracture threshold, grains break along conchoidal fracture planes, creating new sharp cutting edges. This self-sharpening mechanism means angular SiC grains maintain aggressive cutting action over extended use periods, unlike rounded or blocky grain shapes that lose cutting efficiency as edges dull.

Q6: What standards and quality controls apply to SiC grains?

FerrumX SiC grains are available per GB (China National Standards), FEPA (European), and JIS (Japanese Industrial Standards) upon request. Quality control includes routine sampling for particle size distribution verification, chemical composition analysis, and bulk density measurement. Only material meeting internal technical specifications proceeds to final packaging. Batch traceability and COA are provided per shipment.