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新日本制铁公司生产了一种能提高焊接时预热效率的拉伸强度达800MPa的高强度钢材，目前已向用户销售，用于制作建筑用钢筋。迄今800MPa级的高强度钢为防止低温开裂在焊接时需要进行100℃以上的预热，而新的高强度钢通过增加钢成分而使预热温度降低到约50℃即可。该公司已开发出
Nippon Steel Corporation has produced a high-strength steel with a tensile strength up to 800 MPa, which enhances the preheating efficiency during welding and is currently being sold to users for the production of construction steel. To 800MPa high-strength steel so far to prevent low-temperature cracking in the welding requires more than 100 ℃ preheating, and new high-strength steel by increasing the steel composition and the preheating temperature is reduced to about 50 ℃. The company has developed