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Method for manufacturing high strength steel plate to be precipitating TiN and complex oxide of Mg-Ti by nitriding treatment for welded structure
Method for manufacturing high strength steel plate to be precipitating TiN and complex oxide of Mg-Ti by nitriding treatment for welded structure
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机译：通过氮化处理焊接结构来析出TiN和Mg-Ti复合氧化物的高强度钢板的制造方法
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摘要
PURPOSE: A method of manufacturing high strength steel plate having TiN precipitates and composite oxides of Mg-Ti by nitriding treatment for welded structures is provided to minimize toughness difference between base metal and weld heat affected zone. CONSTITUTION: The method for manufacturing the steel plate for welded structure comprises the processes of casting a steel slab comprising 0.03 to 0.17 wt.% of C, 0.01 to 0.5 wt.% of Si, 0.4 to 2.0 wt.% of Mn, 0.005 to 0.2 wt.% of Ti, 0.0005 to 0.1 wt.% of Al, 0.005 wt.% or less of N, 0.0003 to 0.01 wt.% of B, 0.001 to 0.2 wt.% of W, 0.03 wt.% or less of P, 0.03 wt.% or less of S, 0.002 to 0.03 wt.% of O, 0.001 to 0.005 wt.% of Mg, a balance of Fe and other inevitable impurities wherein the steel plate satisfies the follow inequalities: 0.2=Mg/O=3, 3=(Ti+Mg)/O=12, 4=Ti/O=10; heating the steel slab in the temperature range of 1100 to 1250C for 60-180 minutes so that N content in the steel slab satisfies 1.2=Ti/N=2.5, 10=N/B=40, 2.5=Al/N=7, 6.5=(Ti+2Al+4B)/N= 14 within the nitrogen content range of 0.008 to 0.03%; hot rolling the heated steel slab at a reduction ratio of higher than 40% over austenite recrystallization zone; and cooling the hot rolled steel sheet to a bainite transformation finish temperature10C at a cooling rate of 5 to 20C/sec.
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机译：目的：提供一种通过氮化处理焊接结构来制造具有TiN析出物和Mg-Ti复合氧化物的高强度钢板的方法，以使母材和焊接热影响区之间的韧性差异最小化。组成：一种用于焊接结构的钢板的制造方法，包括以下步骤：铸造包含0.03至0.17重量％的C，0.01至0.5重量％的Si，0.4至2.0重量％的Mn，0.005至0.55重量％的钢板。 Ti的0.2 wt。％，Al的0.0005至0.1 wt。％，N的0.005 wt。％以下，B的0.0003至0.01 wt。％，W的0.001至0.2 wt。％，W的0.03 wt。％以下P，S的0.03重量％以下，O的0.002〜0.03重量％，Mg的0.001〜0.005重量％，Fe和其他不可避免的杂质的余量，钢板满足以下的不等式：0.2≤Mg / O <= 3，3 <=（Ti + Mg）/ O <= 12，4 <= Ti / O <= 10;在1100至1250℃的温度范围内将钢坯加热60-180分钟，以使钢坯中的N含量满足1.2≤Ti/ N≤2.5、10≤N / B≤40、2.5≤Al在氮含量0.008〜0.03％的范围内，/ N≤7、6.5≤（Ti + 2Al + 4B）/N≤14。在奥氏体再结晶区以大于40％的压下率对加热的钢坯进行热轧;将热轧钢板以5〜20℃/秒的冷却速度冷却至贝氏体转变结束温度10℃。
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