Large-thickness quenched and tempered Q690E/F high-strength steel and manufacturing method thereof
A technology of Q690E, manufacturing method, applied in the field of metallurgy, to achieve the effect of good application prospects, good strength and toughness, and excellent atmospheric corrosion resistance
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[0028] Example 1
[0029] A large thickness tension Q690E / F high strength steel plate thickness is 100 mm, and the composition of the chemical composition of the steel sheet and the mass content of the mass: C: 0.1%, Si: 0.4%, Mn: 1.4%, P: 0.009%, S : 0.003%, Al: 0.015%, Nb: 0.035%, Ni: 0.5%, B: 0.0008%, Ti: 0.008%, Cr: 0.4%, MO: 0.5%, Cu: 0.25%, N: 0.002%, H : 0.0015%, the margin is Fe and inevitable impurities, CEV = 0.57%.
[0030] The production steps and process parameters of the steel sheet are:
[0031] 1, smelting: LF refining time is 40min, RH vacuum processing time is 15 min;
[0032] 2, continuous casting: overheating 10 ° C, the thickness of the casting is 328 mm, the puller is 0.7m / min, the center segregation C: None;
[0033] 3, heating: heating section maximum heating temperature 1230 ° C, warm segment temperature 1220 ° C, total heating time of the slab in the heating furnace 280min;
[0034] 4, rolling and cooling: two-stage controlled rolling process in the r...
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[0037] Example 2
[0038] A large thickness tension Q690E / F high strength steel plate thickness is 110 mm, the chemical composition composition of steel sheets and the percentage of the mass: C: 0.12%, Si: 0.38%, MN: 1.45%, P: 0.010%, S : 0.002%, Al: 0.020%, Nb: 0.025%, Ni: 0.45%, B: 0.0008%, Ti: 0.02%, Cr: 0.45%, MO: 0.4%, Cu: 0.35%, N: 0.001%, H : 0.0014%, the margin is Fe and inevitable impurities, CEV = 0.58.
[0039] The production steps and process parameters of the steel sheet are:
[0040] 1, smelting: LF refining time 45min, RH vacuum processing time is 12 minutes;
[0041] 2, continuous casting: overheating 12 ° C, the thickness of the mold is 328 mm, the puller is 0.7 m / min, the center segregation C: 0.5;
[0042] 3, heating: heating section maximum heating temperature 1240 ° C, warm segment temperature 1210 ° C, the total heating time of the slab in the heating furnace is 300 min;
[0043] 4, rolling and cooling: two-stage controlled rolling process in the recrystall...
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[0046] Example 3
[0047] A large thickness tension Q690E / F high strength steel plate thickness is 120 mm, and the composition of the chemical composition of steel sheets and the mass content of: C: 0.13%, Si: 0.35%, Mn: 1.5%, P: 0.008%, S 0.002%, Al: 0.025%, Nb: 0.028%, Ni: 0.42%, B: 0.0025%, Ti: 0.01%, Cr: 0.42%, MO: 0.42%, Cu: 0.28%, N: 0.002%, H : 0.0012%, margin is Fe and inevitable impurities, CEV = 0.59.
[0048] The production steps and process parameters of the steel sheet are:
[0049] 1, smelting: LF refining time 48min, RH vacuum processing time is 15 min;
[0050] 2, continuous casting: overheating 18 ° C, the thickness of the mold is 328 mm, the puller is 0.7 m / min, the center segregation C class: 1.0;
[0051] 3, heating: heating section maximum heating temperature 1240 ° C, warm section temperature 1230 ° C, total heating time of the slab in the heating furnace is 310min;
[0052] 4, rolling and cooling: two-stage controlled rolling process by re-crystallizatio...
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