Product Details

Furnace, Kiln, Stove heat holding Castable

As a ten year old refractory material manufacturer, we have worked with many steel plants, metallurgic plants, cement plants, glass plants, provided them with top notch products and services. Here are the refractory bricks we produce:

Products

1.Magnesia-chrome refractory brick

By sintered magnesia and chrome ore as the main raw material in appropriate proportion, is made of high-grade refractory material. It shows better volume stability, strength at high temperature and sensitivity to the small thermal shock.

Physicochemical Index

1.1 Semi direct combined Mg-Cr

Item	Common Mg-Cr Brick	Semi direct combined Mg-Cr Brick
MgO %	≥60	≥65
Cr₂O₃ %	≥8	≥8
Apparent porosity AP %	≥21	≥20
0.2Mpa Loading softened starting temperature (RUL℃)	≥1530	≥1600
Compression strength under normal temperature CCS Mpa	≥30	≥30
Stability against thermal shock TSR(1100℃ water-cooling )	≥4	≥5

1.2 Direct combined Mg-Cr Brick

Direct combined Mg-Cr Brick
Item	ZNMC-12	ZNMC-9-B	ZNMC-9-A	ZNMC-6	ZNMC-4
MgO %	≥60	≥70	≥70	≥75	≥80
Cr2O₃ %	≥12	≥9	≥9	≥6	≥4
SiO₂ %	≥3.2	≥3.0	≥2.8	≥2.8	≥2.5
Apparent porosity AP %	≥19	≥19	≥19	≥18	≥18
Volume density Kg/cm³	≥3000	2980	2980	2950	2930
0.2MPa Loading softenedstarting temperature RUL℃	≥35	40	40	40	40
Compression strength under normal temperature(℃) CCS Mpa	≥1580	≥1580	≥1600	≥1600	≥1600
Stability against thermal shock TSR(1100℃ water-cooling )times	≥4	≥4	≥4	≥4	≥4

2. Fireclay refractory brick

The main crystal phase is mullite, with good fire resistance and physical and chemical property, and high thermal shock resistance and refractoriness, and certain ability to resist erosion against a variety of slag.

Physicochemical Index

Item		N-1	N-2a	N-2b	N-3a	N-3b	N-4	N-5	N-6
Refractorines (℃) ≥		1750	1730	1730	1710	1710	1690	1670	1580
Apparent porosity AP (%) ≥		22	24	26	24	24	24	26	28
0.2MPa Loading softenedstarting temperature RUL℃ ≥		1400	1350	-	1320	-	1300	-	-
Compression strength under normal temperature CCS Mpa		30.0	25.0	20.0	20.0	20.0	20.0	15.0	15.0
linear change on reheating PLC%	1450℃×2h	+0.1 -0.4	+0.1-0.5	+0.2-0.5
linear change on reheating PLC%	1350℃×2h				+0.2 -0.5

3.Loose castable refractories

By reasonable distribution of the granular and powdered materials and the binder composed of not forming and firing directly for the use of the refractories. This kind of material has no fixed shape, which can be made into slurry, mud paste or loose shape.

Physicochemical Index

3.1New concept, high temperature castable refractories

Item	chemical component %	Volume density g/cm3		Disassembly /compressive strength MPa		Linear rate of change %
Item	AL2O3	110℃×24h	1350℃×3h	110℃×24h	1350℃×3h	1350℃×3h
GY-XGN60	≥50	≤1.7	≤1.65	≥4/20	≥4/25	±0.5
GY-XGN70	≥65	≤1.8	≤1.75	≥4/20	≥5/30	±0.5

3.2 Low cement, high-alumina & argillaceous castable refractories

Item	chemical component %	Volume density g/cm3		Disassembly/compressive strength MPa		Line rate of change %
Item	AL2O3	110℃×24h	1350℃×3h	110℃×24h	1350℃×3h	1350℃×3h
GY-NDSN	≥40-50	≥2.2	≥2.1	≥5-7/35-55	≥6-8/50-60	±0.5
GY-LDSN	≥55-80	≥2.4-3.0	≥2.35-2.7	≥6-8/35-80	≥8-9/50-100	0-0.15

Packing Effect

Why choose Unionsum?

History from 1953;
Most authoritative and comprehensive organization in China mining and metallurgy industry;
2 academicians of China Engineering Academy, 108 professors and 500 senior engineers;
50 Laboratories and Pilots (2 state key Labs);
Decades experiences in research and engineering service.

Key services

Minerals processing;
Metallurgy;
Valuable metal recovery;
Off-gas/waste water/slag control & treatment;
Test and analysis.

Our service approach

Scientific research to find a best solution in our Labs and Pilots;
Feasibility study to answer all potential questions;
Basic design and detailed design;
Equipment innovation, fabrication and delivery; Tailor-Made;
On site instruction for installation, commissioning and ramp up;
Test and analysis to control the process performance and guarantee the product quality;
Continuous after sales service, technical supporting and performance improvements.

Global network