1. Original crack of die steel;

2、氧化皮（黑皮）去除不完全，微裂纹扩展导致开裂；

2. Incomplete removal of oxide scale (black scale) and microcrack propagation lead to cracking;

3、热处理淬火裂纹（含微裂纹，使用过程中扩展开裂）；

3. Heat treatment quenching cracks (including microcracks and propagation cracks during use);

4、重复淬火，表面脱碳产生开裂或者微裂纹；

4. Repeated quenching, surface decarburization, cracking or microcracks;

5、淬火温度过高，或者奥氏体化时间过长导致获得组织粗大，韧性降低，后期在诱因下产生的开裂；

5. The quenching temperature is too high or the austenitizing time is too long, resulting in coarse microstructure, reduced toughness and cracking caused by inducement in the later stage;

6、热处理硬度选择不当，回火工艺选择不当，热处理后组织获得的韧性不足，结合其他诱因产生的开裂；

6. Improper selection of heat treatment hardness, tempering process, insufficient toughness of microstructure after heat treatment, combined with cracking caused by other inducements;

7、热处理过程回火不充分，内部应力释放不完全，结合诱因导致早期开裂；

7. Insufficient tempering during heat treatment, incomplete internal stress release and early cracking caused by combined inducement;

8、设计强度不足，或局部加工过切，沿薄弱处的撕裂或者开裂；

8. Insufficient design strength, or local processing overcut, tearing or cracking along the weak part;

9、设计未规避尖角应力集中现象，应力诱因下沿直角或者拐角处的开裂；

9. The design does not avoid the phenomenon of stress concentration at sharp corners, and the cracking at right angles or corners under stress inducement;

10、线割、加工白层过厚，白层内微裂纹的扩展引起的开裂；

10. Cracking caused by the propagation of microcracks in the white layer due to excessive thickness of white layer during wire cutting and processing;

11、磨削过热，产生磨削裂纹，沿裂纹扩展形成的开裂；

11. Grinding overheat, resulting in grinding cracks, cracks formed along the crack propagation;

12、烧焊处理不当，焊接层内部裂纹扩展导致的开裂；

12. Cracking caused by crack propagation in the welding layer due to improper welding treatment;

13、应力腐蚀开裂（通常沿内孔处，冷却水腐蚀为诱因，从加工粗糙处通过应力撕开）；

13. Stress corrosion cracking (usually along the inner hole, caused by cooling water corrosion, torn through stress from the rough processing);

14、外力造成的非正常开裂；

14. Abnormal cracking caused by external force;

15、疲劳极限后的正常损坏形成的开裂；

15. Cracking caused by normal damage after fatigue limit;

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