求翻译：T24钢的下转变点，即AC1温度为820℃，其上转变点的温度，即AC3温度为960～990℃。根据规范案例ASTM A-213标准的规定，T24应在1830°F（980℃）温度下做正火热处理，然后进行空气冷却或加速冷却，在最低1345°F（730℃）温度下做回火处理。是什么意思？

t24 steel transition point, ac1 temperature of 820 ℃, on the temperature of the transition point the ac3 temperature of 960 ~ 990 ℃. In accordance with the provisions of the Code Case astm a-213 standard, t24, the temperature of 1830 ° f (980 ℃) are heat treatment, and then air cooling or accelerate

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The T24 steel under transition point, namely the AC1 temperature is 820℃, above the transition point temperature, namely the AC3 temperature is 960~990℃.According to standard case ASTM the A-213 standard stipulation, T24 should make fiery processing under 1830°F(980℃) temperature, then carries on th

T24 steel transformation point, AC1 temperature as 820 ° c, its temperature changing on points, AC3 temperature is 960~990℃. Under the provisions of ASTM A-213 standard specification case, T24 1830 ° f (980 ° c) temperature normalized heat treatment under, and then make the air or accelerated coolin

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