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Invention Publication
CN108385020A 420MPa级低焊接裂纹敏感性的高强度钢板及其制造方法 有权

420MPa级低焊接裂纹敏感性的高强度钢板及其制造方法
Abstract:
420MPa级低焊接裂纹敏感性高强度钢板及其制造方法，包括，C：0.05-0.1%；Si：0.10-0.3%；Mn：1.40-1.7%；P≤0.02%；S≤0.005%；Nb：0.03-0.06%；V：0.03-0.05%；Ti：0.008-0.02%；Ni：0.15-0.5%；Cu：0.15-0.5%；Mo：0.08-0.3%，且Cr+Mo：0.15-0.35%；Ca≤0.005%；Cu/Ni：≤3；Als：0.015-0.045%；Ca/S：0.5-2；B≤0.0005%；Pcm：0.17-0.21%；其余为Fe。钢板屈服强度≥420Mpa，横向冲击功≥100J。
Abstract(English):

The invention discloses a 420MPa level low welding crack sensitivity high-strength steel plate and a manufacturing method thereof. The 420MPa level low welding crack sensitivity high-strength steel plate comprises 0.05%-0.1% of C, 0.10%-0.3% of Si, 1.40%-1.7% of Mn, smaller than or equal to 0.02% of P, smaller than or equal to 0.005% of S, 0.03%-0.06% of Nb, 0.03%-0.05% of V, 0.008%-0.02% of Ti, 0.15%-0.5% of Ni, 0.15%-0.5% of Cu, 0.08%-0.3% of Mo, 0.15%-0.35% of Cr+Mo, smaller than or equal to 0.005% of Ca, smaller than or equal to 3 of Cu/Ni, 0.015%-0.045% of Als, 0.5-2 of Ca/S, smaller thanor equal to 0.0005% of B, 0.17%-0.21% of Pcm, and the balance Fe. The yield strength of the steel plate is larger than or equal to 420 Mpa, and the transverse ballistic work is larger than or equal to 100 J.

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