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Thick high-strength steel sheet for large heat input welding with low base metal low-temperature toughness variation and excellent heat-affected zone toughness, and method for producing the same
Thick high-strength steel sheet for large heat input welding with low base metal low-temperature toughness variation and excellent heat-affected zone toughness, and method for producing the same
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机译：具有低贱金属低温韧性变化和优异的热影响区韧性的用于大热输入焊接的厚高强度钢板及其制造方法
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摘要
A thick high strength steel sheet for high heat input welding having small deviation of low temperature toughness in a parent material and excellent toughness in a heat affecting zone and manufacturing method therefore are provided to acquire low toughness without deviation by minimizing the maximum grains and prescribing a chemical composition strictly. A thick high strength steel sheet for high heat input contains 0.03~0.08wt.% of carbon, 0.05wt.% and below of silicon, 1.4~1.7wt.% of manganese, 0.01~0.06wt.% of aluminum, 0.05wt.% and below of phosphorus, 0.01wt.% and below of sulfur, 0.20~0.40wt.% copper, 0.20~0.60wt.% of nickel, 0.005~0.015wt.% of niobium, 0.005~0.03wt.% of titanium, 0.0005~0.0030wt.% of boron and 0.0030~0.0090wt.% of nitrogen.
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