Steel plate for hot-rolled double-side enamel and method for producing same

Abstract

The invention provides a kind of hot-rolled double-sided enamel-used nickelclad, the chemical components of which is: C 0.02%-0.06%, Si <=0.50%, Mn 0.15%-0.40, P <=0.15%, S <=0.006%, N<=0.003%, Ti 0.08%-0.20%, Als 0.005%-0.055%, Ti / C 2.2-5,unavoidable impurities and Fe as balance. The architecture of the nickelclad is ferrite with grain diameter = 2 mum-20 mum under hot rolling conditions, and TiC particles (diameter < 20nm is uniformly distinguished in the architecture. V 0.015%-0.060% and / or Cr 0.05%-0.20% can also be added. The production method of the clad is: producing unburnt earthenware with continuous cast method, heating to 1180-1260DEG C, descaling with high-handed water, rough rolling, finish rolling for 5-7 passes at 1100-960 DEG C and finally at 920DEG C-840DEG C, continuously cooling to 450- 630DEG C at a speed of >=30DEG C / S in 0-7S, and coiling. The nickelclad has the advantages of good performance and high strength, and can meet the requirement of large scaled engineering fembers.

Description

technical field [0001] The invention relates to a steel plate for enamelling and a manufacturing method thereof, in particular to a steel plate with a yield strength of 280N / mm after enameling. 2 The above high-strength hot-rolled double-sided enameled steel plate and its manufacturing method. Background technique [0002] Today, with the increasing awareness of environmental protection and cost awareness, some large-scale water treatment facilities, chemical facilities, and environmental protection facilities are showing a trend of using enamel components to assemble. [0003] However, due to the existing hot-rolled steel plate material, good double-sided enamelling performance is not considered, so only one-sided enamelling with ordinary quality requirements can be carried out. However, some special hot-rolled enamelled steel plates only consider the enameling performance of the steel plate unilaterally, and do not have high yield strength after enameling. After enamel, ...

AI Technical Summary

Problems solved by technology

[0003] However, due to the existing hot-rolled steel plate material, good double-sided enamel performance is not considered, so only one-sided enamel with ordinary quality requirements can be carried out

However, some special hot-rolled enamel steel plates only consider the enamel performance of the steel plate unilaterally, and do not have high yield strength after enamel.

After enamel, the yield strength becomes very low (generally lower than 250N / mm 2 ), which cannot meet the strength requirements of large-scale engineering component design, so that the design is limited

The same problem exists in the cold-rolled enamelled steel plate, that is, the strength is insufficient after double-sided enamelling

Moreover, the manufacturing cost is high, and thick-gauge products cannot be produced

[0004] The thickness specifications of existing cold-rolled enamelled steel plates are mostly less than 3 mm, and the yield strength is insufficient. Both the specifications and strength cannot meet the assembly requirements of large-scale enamelled assembled components.

And the C content is low, below 0.008%, Ti / C is all above 5, and the production cost is high (such as Japan's special publication No. 58-1170)

[0005] For hot-rolled enamelled steel sheets alloyed with Ti, in order to ensure the enamel performance, the Ti / C ratio is often increased to more than 4, such as the Japanese patent "JP 10-121141", and the C content is less than 0.005%, and the production cost is high. Without enamel, the yield strength is higher than 280N / mm 2 specialty

Existing technologies such as Japanese patents "JP-A-55-152127" and "JP-8-269540" are not suitable for continuous casting because of high Ti content, high production cost and difficulty, or C content is less than 0.01%. Not enough to guarantee the yield strength after enamel

"Ping 2-305926" and "Zhao 58-1013" proposed to add B, N, Cu alloying, the production is not easy to control, and it is not enough to guarantee the performance requirements of double-sided enamel

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