1350 °C is not a slogan. It is a number we have to be right about.
1350 ℃ 不是一句口号。
这是一个我们必须说准的数。
Say a tube runs to 1350 °C and it must run to 1350 °C — not 1300 on a bad batch. This trade is measured in degrees, minutes, ratios and millimetres, and being a little bit out means scrap. 说这支管能用到 1350 ℃，它就得真能用到 1350 ℃——不能某一窑只到 1300。这门手艺是拿度、分钟、配比和毫米量出来的，差一点，就是废品。
Below 900 °C the nitride bond is not the reason you would choose it. Above 1350 °C we do not claim it. The useful part of any specification is where it stops. 低于 900 ℃，选它就不是为了氮化结合相。高于 1350 ℃，我们不承诺。任何一份参数真正有用的部分，是它在哪里打住。
What you are buying is not the material. It is the certainty of the number.你买的不是材料，是那个数字的确定性。
Every refractory supplier can name a temperature. The trade is in the tolerances behind it — and in whether the tenth batch matches the first. 哪家耐火材料厂都报得出一个温度。真正的门槛在它背后的公差里——以及第十窑和第一窑是不是一样。
※ Indicative values for this design concept — to be verified by Guoshi before launch.※ 本方案演示用示例数据，正式上线前须由郭氏核定。
Five families, each with the window it is good for — and the edges of it.五个系列，各有各的工况区间——以及区间的两头。
Give us the four numbers that decide it.把决定选型的那四个数给我们。
Temperature, atmosphere, cycle, and the failure mode you saw last time. From those we can name a grade and a geometry. 温度、炉内气氛、生产节奏，以及上次的失效形式。有这四项，我们就能给出材质与结构。