Refractory materials

Refractory Materials for Steel Plants and High-Temperature Equipment

LONSUN supplies shaped refractory products for furnace, ladle, tundish, coke-oven, kiln and metallurgical maintenance applications. Material and grade are selected from the working position, temperature, slag or atmosphere, mechanical load, lining design and service-life target.

Discuss Your Refractory Material Requirement

Refractory materials protect industrial equipment from high temperature, chemical attack, slag, wear and heat loss. The current product page uses magnesia and other refractory bricks as representative products. A correct specification must identify the exact lining position and working environment before a brick family is selected.

Refractory Product Types and Applications

The appropriate refractory direction changes with contact temperature, slag chemistry, atmosphere, load, thermal cycling and whether the position is a working or backup lining.

PRODUCT DIRECTION	TYPICAL APPLICATION	COMMON REQUIREMENT	DATA TO REVIEW
Fireclay brick	General furnace and backup lining	Practical thermal stability, strength and cost balance	Service temperature, atmosphere, load, lining thickness and heat cycle
High-alumina / mullite brick	Steelmaking furnace, ladle, kiln and high-temperature lining	Higher refractoriness and application-matched slag/wear resistance	Al2O3 requirement, slag, temperature, load, joints and current lining life
Insulating fire brick	Backup insulation and energy-saving lining	Low heat loss with sufficient hot-face support and installation strength	Backup position, bulk density, temperature, compressive load and lining design
Magnesia and special brick	Basic-slag, ladle, tundish, coke-oven and special metallurgical positions	Chemical compatibility and controlled wear under the actual atmosphere	Slag chemistry, temperature, carbon/SiC direction, wear mechanism and service target

Do not select refractory material from maximum temperature alone. Chemical compatibility, load, thermal cycling, joints and installation quality often control service life.

Material and Technical Reference

The current published table provides broad product directions and temperature references. Exact classification temperature, permanent-change limit, hot strength and chemical composition remain grade-specific.

Refractory Brick Reference

Product Type	Main Material Direction	Published Temperature Reference	Common Application
Fireclay Brick	Alumina silicate / fireclay	Approx. 1300-1700°C depending on grade	General furnace lining and backup lining
High Alumina Brick	High alumina / mullite direction	Approx. 1500-1790°C depending on Al2O3 content	Steelmaking furnace, ladle, kiln and high-temperature lining
Insulating Fire Brick	Lightweight alumina silicate direction	Approx. 1100-1500°C depending on grade	Backup insulation and energy-saving lining
Customized Refractory Brick	Magnesia, carbon, SiC or other special direction	According to working condition	Ladle, tundish, furnace, coke oven and special metallurgical service

Published temperature ranges are broad category references, not guaranteed continuous-use limits. Confirm chemical composition, refractoriness, bulk density, apparent porosity, cold crushing strength, thermal behavior and test standards for the selected grade.

$Packaged magnesia refractory bricks for metallurgical applications$

$Shaped refractory bricks for high-temperature industrial lining$

Common Refractory Lining Problems and First Review

A refractory failure should be reviewed by location, material, installation, heat cycle, atmosphere and slag—not by brick appearance alone.

SYMPTOM	POSSIBLE AREAS TO CHECK	INFORMATION NEEDED
Cracking or spalling	Thermal shock, rapid heat-up/cool-down, expansion restraint, joints, material mismatch and mechanical impact	Location map, heat cycle, lining design, installation record and photographs
Slag or chemical corrosion	Material/slag compatibility, basicity, FeO, atmosphere, temperature and penetration	Slag/ash chemistry, brick analysis, temperature, wear profile and service time
Erosion or rapid wear	Gas/metal velocity, abrasion, impact, hot strength, joints and local geometry	Working position, flow direction, thickness loss, material grade and operating cycle
Excessive heat loss	Insulation thickness, joints, anchors, backup lining, moisture and damaged areas	Shell-temperature map, lining drawing, material density/conductivity and inspection
Joint opening or lining movement	Expansion allowance, mortar, anchoring, shell deformation, installation and thermal growth	Joint pattern, lining/anchor drawing, installation data, shell condition and photographs

Safety note: refractory inspection and demolition may involve residual heat, unstable lining, dust, confined spaces and falling material; use site-approved cooling, isolation, access and respiratory-protection procedures.

RFQ and Procurement Checklist

A refractory RFQ should define the exact lining position and operating chemistry before price per piece or ton is compared.

RFQ ITEM	BUYER PROVIDES	LONSUN CONFIRMS
Application position	Furnace/ladle/tundish/coke-oven location, hot face or backup lining and lining drawing	Material family, brick shape and supply boundary
Operating conditions	Normal/peak temperature, atmosphere, heat cycle, slag/metal/ash chemistry, abrasion and load	Grade direction and critical property requirements
Dimensions and installation	Brick drawing, tolerances, joints, mortar, anchors, lining thickness and installation method	Shape, tolerance, packing and installation compatibility
Current performance	Existing grade, supplier data, service life, wear pattern and failure photographs	Comparison baseline and risks to address
Quality documents	Chemistry, density, porosity, strength, refractoriness, thermal tests and third-party inspection	Test standards, sampling, acceptance criteria and certificate list
Commercial requirement	Quantity/tonnage, delivery batches, destination, required date, packaging and Incoterm	Price basis, production scope, pallet/packing and quotation validity