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3. The backfire heating temperature of the 20MnMoB steel is changed from “2000℃” to “200℃” in the serial 19 of Table 3. 4. The “sampling number” of the “ultrasonic detection” is changed from “gradual radix” to “2” in the 13 item of Table 7. shape.
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Institute of Metallurgical Ministry, ShangHai Five Steel (group) limited company. The main draftsmen of this standard are Fangjun, Liuwende, Luanyan, Hanguoliang, and Chenchangxi. The backfire heating temperature of the 20MnMoB steel is changed from “2000℃” to “200℃” in the serial
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