Hot rolled steel plate with the honed yield strength of 400 MPa for counterenamel and manufacturing method of hot rolled steel plate

Abstract

The invention relates to a hot rolled steel plate with the honed yield strength of 400 MPa for counterenamel. The hot rolled steel plate is prepared from, by mass percent, 0.08% to 0.15% of C, not larger than 0.10% of Si, 1.0% to 2.0% of Mn, 0.060% to 0.10% of P, not larger than 0.006% of S, not larger than 0.008% of N, 0.02% to 0.08% of Ti, 0.010% to 0.045% of Als, 0.020% to 0.055% of V, 0.01% to0.05% of Nb, 0.15% to 0.30% of Mo and the balance Fe and inevitable impurities. When the thickness of the hot rolled steel plate is larger than or equal to 8 mm, 0.0005% to 0.005% of B is added. Thehoned yield strength of the hot rolled steel plate is larger than or equal to 400 MPa. The hot rolled steel plate has good scute burst resisting performance, meanwhile, the honed yield strength can reach 400 MPa or above, and the requirement of a large enamel assembling structure can be met better.

Description

technical field [0001] The invention relates to the technical field of production of low-alloy hot-rolled steel sheets, in particular to a hot-rolled steel sheet for double-sided enamelling and a manufacturing method thereof. Background technique [0002] In large-scale water treatment facilities, chemical facilities, environmental protection facilities, and biomass energy projects, the use of enamel assembly structures has obvious advantages such as low investment costs, short construction periods, and long service life of equipment. [0003] The main material of the enamel assembled structure is a hot-rolled steel plate with good double-sided enamel performance. In order to meet the structural design requirements, the thickness of the hot-rolled steel plate is generally 3.0mm to 16mm, and the yield strength level after enamelling is generally above 200MPa. [0004] Although cold-rolled enamel steel sheets can meet the performance requirements of enamel, due to the thickne...

AI Technical Summary

Problems solved by technology

However, as the volume of enamel-assembled structural parts continues to increase, higher requirements are put forward for the strength of the steel plate after enamel. The yield strength of the hot-rolled steel plate in the above technical solution still cannot meet the needs of large-scale enamel-assembled structural projects.

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