Thermal shock resistant low creep high-aluminum series for hot blast furnaces

The series of products represent the improvement of low creep brick products, in addition to a low creep rate, more notable features include high thermal shock stability, in 2003, it passed the results appraisal organized by Henan Metallurgy Department, and successively supplied over 5,000 tons of hot blast furnace for Baosteel and TISCO, and the indexes have reached or even exceeded the level of the similar products introduced by Baosteel from Japan. In 2004, it was awarded the Metallurgical Science and Technology Award by the China Iron and Steel Association.

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Series for Hot Blast Furnaces

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Index Item	WH21	WH 22	WH 23	WH 231	WH 24	WH 25	WHIMF	WML-72
Al2O3 %	≥75	≥80	≥65	≥65	≥65	≥65	≥70	≥72
Fe2O3 %	≤1.0	≤1.0	≤1.2	≤1.2	≤1.5	≤1.8	≤1.5	≤1.0
Apparent porosity %	≤21	≤21	≤21	≤20	≤22	≤22	≤22	≤24
Bulk density BD ,g/cm3	≥2.70	≥2.75	≥2.60	≥2.60	≥2.50	≥2.45	≥2.5	≥2.70
Normal temperature compressive strength CSS, MPa	≥70	≥70	≥65	≥65	≥60	≥60	≥60	≥50
Softening onset temperature at 0.2 MPa load RUL，℃	≥1700	≥1700	≥1650	≥1650	≥1600	≥1550	≥1600	≥1550
Reburning line change rate PLC（%）	1500℃×4h ± 0.2	1500℃×4h ± 0.2	1500℃×4h ± 0.2	1450℃×3h ± 0.2	1450℃×3h ± 0.2	1450℃×3h ± 0.2	1500℃×4h ± 0.2	1500℃×4h ± 0.2
Creep rate(0.2MPa),%	1550℃×50h≤0.8	1500℃×50h≤0.8	1450℃×50h≤0.8	1450℃×50h≤0.8	1400℃×50h≤0.8	1350℃×50h≤0.8	/	1500℃×50h≤0.8
TSR ，（1100℃water cooling）次Cycle	≥15	≥15	≥15	≥30	≥15	≥15	≥25	≥40
Note: Thermal shock stability index is adjustable as per the requirements of customers