利索-全球专利检索

  1. 登录
  2. 注册
发明公开
CN104789898A 一种超高强度止裂厚钢板的生产方法 无效 - 驳回

一种超高强度止裂厚钢板的生产方法
摘要：
一种超高强度止裂厚钢板的生产方法，钢的化学组成重量百分比为C≤0.10%，Si=0.10%～0.50%，Mn=1.40%～1.80%，P≤0.015%，S≤0.005%，Nb=0.02%～0.05%，Ti=0.008%～0.02%，Al=0.015%～0.05%，Ni=0.2%0～0.50%，Cu≤0.35%，Gr≤0.25%，Mo≤0.25%，其余为Fe和不可避免的杂质；关键工艺步骤包括：冶炼，连铸，加热，轧制，冷却。本发明采用低碳高锰、Nb-Ti-Ni多元微合金化成分设计体系，结合LF+VD复合精炼和超快速冷却技术，生产屈服强度在400Mpa以上的超厚钢板，最大厚度可达到80mm。钢板心部-40℃冲击韧性能达到250J以上，无塑性转变温度在-80℃以下，具有较高的强韧性、焊接性和止裂性的高强度钢板。
摘要（英）：

The invention relates to a production method of an ultrahigh-strength anti-cracking thick steel plate. The steel comprises the following chemical components in percentage by weight: at most 0.10% of C,0.10%-0.50% of Si, 1.40%-1.80% of Mn, at most 0.015% of P, at most 0.005% of S, 0.02%-0.05% of Nb, 0.008%-0.02% of Ti, 0.015%-0.05% of Al, 0.2%0-0.50% of Ni, at most 0.35% of Cu, at most 0.25% of Gr, at most 0.25% of Mo, and the balance of Fe and inevitable impurities. The production method comprises the following key steps: smelting, continuous casting, heating, rolling and cooling. By adopting the low-carbon high-manganese Nb-Ti-Ni multielement microalloying component design system in combination with LF+VD (ladle furnace+vacuum degasser) compound refining and ultra-fast cooling techniques, the ultra-thick steel plate with the yield strength of 400 MPa above and the maximum thickness of 80mm can be produced. The -40-DEG C impact toughness of the steel plate core can reach 250J above, the nil ductility transition temperature is -80 DEG C below, and the high-strength steel plate has higher toughness, weldability and cracking resistance.

0/0