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杭钢于1991年先后在1号高炉(342m~3)和3号高炉(302m~3)铁沟中使用了MT系列预制耐火沟槽。该沟槽单件长度1m,断面形状呈“凹”字形,沟面为圆弧浅“U”形,采用Al_2O_3—SiC—C优质耐火材料配制、拌合浇注成型,并经脱水烧结而成,体积密度为2.6～2.65g/cm~3(1450°·Zh),耐压和抗折强度分别为80MPa和15MPa(1450·2h),重烧线变率为—0.15％～—0.10％(1450℃·2h),Al_2O_3含量为40％～72％,
In 1991, Hangzhou Iron and Steel used MT series prefabricated refractory trenches successively in iron trenches of No. 1 blast furnace (342m 3) and No. 3 blast furnace (302m 3). The groove has a length of 1m and a cross-sectional shape of “concave” shape, and the groove surface is a shallow arc of “U” shape, which is prepared by using Al 2 O 3 -SiC-C high-quality refractory material, mixing and pouring and forming through dewatering and sintering, The bulk density ranged from 2.6 to 2.65 g / cm ~ 3 (1450 ° · Zh), and the compressive and flexural strengths were 80 MPa and 15 MPa (1450 · 2 h) respectively. The rate of reheating was -0.15% -0.10% ℃ · 2h), Al 2 O 3 content of 40% ~ 72%