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CN103555908A 一种调质高强度Q620E特厚钢板的生产方法 有权

一种调质高强度Q620E特厚钢板的生产方法
摘要：
一种调质高强度Q620E特厚钢板的生产方法，工艺步骤为铁水预处理→转炉炼钢→炉外精炼→连铸（动态轻压下+电磁搅拌）→加热→轧制→预矫直→在线淬火→离线淬火→回火→精整→性能检验→超声波探伤。钢的化学组成百分含量为C≤0.16，Si=0.20～0.40，Mn=1.40～1.60，P≤0.015，S≤0.003，Als=0.03～0.06，Nb+Ti≤0.06，Cu+Ni≤1.0，Cr=0.30～0.60，Mo=0.30～0.50，B≤0.0025，余量为Fe和不可避免的杂质。控制CEV≤0.60，CEV按CEV=C＋Mn/6＋（Cr＋Mo＋V）/5＋（Ni＋Cu）/15公式进行计算。生产出的高性能100～120mm调质高强度Q620E特厚钢板满足了矿山、港口等重型机械制造的需要。
摘要（英）：

The invention relates to a production method of a quenched and tempered high-strength Q620E super-thick steel plate. The process steps are as follows: pretreatment of molten iron, steel-making by a converter, secondary refining, continuous casting (dynamic soft reduction and electromagnetic stirring), heating, rolling, pre-straightening, online quenching, offline quenching, tempering, finishing, performance testing and ultrasonic flaw detection. Steel comprises the following chemical components in percentage by weight: not more than 0.16% of C, 0.20-0.40% of Si, 1.40-1.60% of Mn, not more than 0.015% of P, not more than 0.003% of S, 0.03-0.06% of Als, not more than 0.06% of Nb+Ti, not more than 1.0% of Cu+Ni, 0.30-0.60% of Cr, 0.30-0.50% of Mo, not more than 0.0025% of B and the balance of Fe and inevitable impurities. The CEV (carbon equivalent) is controlled to be not more than 0.60, and the CEV is calculated according to the following formula: CEV=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15. The produced high-performance 100-120mm quenched and tempered high-strength Q620E super-thick steel plate can meet the needs for manufacturing heavy machinery in mines, ports and the like.

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