合金结构钢在锻造加热时容易产生过热。在调质状态下检验断口时,则表现有石状断口的缺陷。石状断口曾被认为采用一般的热处理工艺不易消除,因而在冶金部部颁标准[YB486-64]中被规定为“不允许有的断口缺陷”。钢材因过热而导致报废,在经济上带来很大的损失。今后,随着低硫洁净钢的广泛使用,钢的过热倾向随之增大,因此,对于钢的过热问题,不能不给予高度的重视。 Alloy steel is prone to overheating during forging heating. In the quenched and tempered state test fracture, the performance of the stone-like fracture defects. Stone fracture has been considered as a general heat treatment process is not easy to eliminate, and therefore Ministry of Metallurgical ministerial standards [YB486-64] is defined as “not allowed to have fracture defects.” Steel scrapped due to overheating, resulting in great economic losses. In the future, with the widespread use of low-sulfur clean steel, steel overheating tend to increase, therefore, for steel overheating, can not but give high priority.