摘要：按氧化铝含量分牌号，抗渣、热震、荷重软化三个指标对应三种工况。讲选型逻辑与进场验收。
Abstract: Grades follow alumina content; slag resistance, thermal shock and refractoriness-under-load map to three duty types. Selection logic plus incoming inspection.
正文： 高铝砖不是越贵越好，是对号入座。看错工况选错砖，再好的牌号也撑不住。
Main text: High alumina brick is not about price, it is about matching the duty. Right grade, wrong duty, same failure.
一、按工况对指标
1. Match metrics to duty
熔渣侵蚀看低气孔牌号，温度波动看热震稳定性，承重部位看荷重软化温度。三个指标别混着看。
Slag attack: low porosity. Thermal cycling: shock resistance. Load-bearing: refractoriness under load. Do not mix the three up.
二、牌号差距在高温
2. Grades diverge when hot
常温耐压都够用，差距体现在荷重软化点，高温部位差一个牌号寿命差一截。
Cold crushing looks the same across grades; the gap shows at temperature. One grade off can halve campaign life.
三、进场先验收
3. Inspect on arrival
核对理化报告、抽查尺寸与缺棱掉角、同批色泽一致。异常发黑和裂纹砖当场剔。
Check the lab report, sample dimensions and chipped edges, watch batch colour uniformity. Black-stained or cracked bricks go back.
- 先定工况再定牌号，顺序不能反。
Define the duty first, then the grade — never reversed. - 高温指标才是牌号的真正差距。
Hot properties are where grades truly differ. - 验收在现场做，报告只代表送检那批。
Inspect on site; reports only cover the sample batch.
选砖如配钥匙，锁是工况，钥匙是指标，配错了开不了门。
Choosing brick is cutting a key: the lock is the duty, the key is the metric.
