Post Annealed High Tensile Strength Coated Steel Sheet having Improved Yield Strength and Hole Expansion
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example 1
[0075]Semi-finished products have been produced from steel castings. The chemical compositions of the semi-finished products, expressed in weight percent, are shown in Table 8 below. The rest of the steel compositions in Table 8 consists in iron and inevitable impurities resulting from the smelting.
TABLE 8CSiMnPSCuAlTiNbNCrNiBMoA0.171.551.810.0170.005—0.65—0.0200.0045———0.15B0.150.72.60.0150.003—0.8—0.0100.0046———0.15C0.211.31.50.0160.003—0.58—0.0210.0042——100.30D0.211.31.50.0160.003—0.58—0.0200.0041———0.30Table 1: Chemical composition (wt %, B in ppm).
[0076]Ingots of composition A to D were initially hot rolled to 20 mm thick plates. Then, the plates were reheated and hot-rolled again down to 3.8 mm. The hot rolled steel plates were then cold rolled and annealed. The process parameters undergone are shown hereunder:[0077]Finishing rolling temperature: 875° C.[0078]Coiling temperature: 580° C.[0079]Cold rolling reduction rate: around 50%[0080]Soaking temperature during annealing: 82...
example 2
[0088]Semi-finished products have been produced from steel castings. The chemical composition of the semi-finished products, expressed in weight percent, is shown in Table 12 below. The rest of the steel composition in Table 5 consists in iron and inevitable impurities resulting from the smelting.
TABLE 12CSiMnPSCuAlTiNbVNCrNiBMoE0.181.521.990.0130.0050.040.620.0050.0070.0070.00650.040.0130.15Table 5: Chemical composition (wt %, B in ppm).
[0089]Ingot of composition 5 was initially hot rolled to 20 mm thick plates. Then, the plates were reheated and hot-rolled again down to 3.8 mm. The hot rolled steel plates were then cold rolled and annealed. The process parameters undergone are shown hereunder:[0090]Finishing rolling temperature: 930° C.[0091]Coiling temperature: 680° C.[0092]Cold rolling reduction rate: around 50%[0093]Soaking temperature during annealing: 825° C.[0094]Soaking duration during annealing: 150 s.
After annealing, coating by hot dip galvanizing in a bath of molten zinc...
example 3
[0099]Semi-finished products have been produced from a steel casting. The chemical composition of the semi-finished products, expressed in weight percent, is shown in Table 14 below. The rest of the steel composition in Table 14 consists in iron and inevitable impurities resulting from the smelting.
TABLE 14CSiMnPSCuAlTiNbNCrNiMoF0.220.111.730.020.0010.041.490.010.010.010.020.020.13Table 7: Chemical composition (wt %).
[0100]Ingots of composition F were initially hot rolled to 4 mm thick plates. The hot rolled steel plates were then cold rolled and annealed. The process parameters undergone are shown hereunder:[0101]Finishing rolling temperature: 900° C.[0102]Coiling temperature: 550° C.[0103]Cold rolling reduction rate: around 50%[0104]Soaking temperature during annealing: 850° C.[0105]Soaking duration during annealing: 100 s
[0106]After annealing, coating by hot dip galvanizing in a bath of molten zinc was performed with an immersion temperature of 455° C., followed by a galvannealin...
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