Hot-rolled steel plate for enameled high-strength double-face enamel and manufacturing method of steel plate

Abstract

The invention discloses a hot-rolled steel plate for enameled high-strength double-face enamel and a manufacturing method of the steel plate. When the thickness of the steel plate is smaller than or equal to 8 mm, the chemical components in the steel comprise, by weight percent, 0.030% to 0.070% of C, not larger than 0.10% of Si, 0.60% to 1.5% of Mn, 0.05% to 0.11% of P, not larger than 0.006% of S, not larger than 0.008% of N, 0.09% to 0.21% of Ti, 0.03% to 0.07% of Nb, 0.015% to 0.060% of V, 0.005% to 0.055% of Als, 3.0% to 6.0% of Ti/C and the balance is Fe and inevitable impurities, when the thickness of the steel plate is larger than 8 mm, B is added, the content of the B ranges from 0.0005% to 0.005%,. The casting blank with the above component is heated to 1180 DEG C to 1250 DEG C, after soaking, high-pressure water descaling and rough rolling cogging are carried out, the finish rolling cogging temperature ranges from 880 DEG C to 1100 DEG C, the finish rolling temperature ranges from 880 DEG C to 930 DEG C, rapid cooling to the reeling temperature is achieved with the cooling speed larger than or equal to 30 DEG C/S after rolling, and the reeling temperature ranges from 630 DEG C to 700 DEG C.

Description

technical field [0001] The invention belongs to the field of manufacturing low-alloy hot-rolled steel sheets, and particularly relates to a hot-rolled steel sheet for enamelling high-strength double-sided enamel 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 structure has obvious advantages such as low investment cost, short construction period, and long equipment service life. [0003] The main material of the enamel assembly 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 steel plate is generally 3.0 ~ 16mm, and the yield strength level after enamelling is generally above 200MPa. [0004] Although the cold-rolled enamel steel plate can meet the requirements of enamel performance, because the th...

AI Technical Summary

Problems solved by technology

However, as the volume of enamel-assembled structural parts continues to increase, higher requirements are placed on the post-enamelling strength of steel plates. At this time, the yield strength of steel plates in the ZL200510047758.1 patent cannot meet the needs of large-scale enamel-assembled structural projects.

Images