Hard tinned plate suitable for stamping processing and production process thereof

Abstract

The invention relates to a hard tinned plate which is suitable for stamping processing and is produced from low carbon Al-killed steel. The original plate comprises the chemical components by weight percentage: 0.08 to 0.13 percent of C, less than or equal to 0.025 percent of Si, less than or equal to 0.65 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.020 percent of S, 0.02 to 0.06 percent of solAl, less than or equal to 0.03 percent of Ti, less than or equal to 0.005 percent of N, and Fe and unavoidable impurities accounting for the margin. The production process adopts the steps of steelmaking with molten iron->continuous casting-hot rolling->push-pull mode pickling->HC rolling mill cold rolling->electrolytic degreasing->hydrogen bell furnace annealing(BA)->double-machine leveling->electrolytic tinning, and finally the hard tinned plate can be obtained. The hard tinned plate of the invention has the advantages of low cost, high hardness, favorable stamping processability, and the like, and can be widely used as packing materials for food, drinks, etc.

Description

technical field [0001] The invention relates to a hard tinned plate and a production method thereof, in particular to a hard tinned plate suitable for stamping and a production process thereof produced by bell annealing. Background technique [0002] At present, there are two annealing methods for cold-rolled tin-plated raw plates, namely bell furnace annealing (BA) and continuous annealing (CA). Generally speaking, bell furnace annealing is generally suitable for the production of soft (ie, lower hardness) tinplate (such as TH52, TH55, TH57 grades); while continuous annealing furnaces are generally suitable for producing hard Tin plate (such as TH61, TH65, etc.). [0003] Relevant foreign literature introduces that Kawasaki, Japan, uses an efficient continuous annealing process to produce soft and hard ultra-thin steel plates (tin-plated original plates) with good formability for cans, and to stably produce T5 grade and above steel plates by adding N elements. Hard tin-pl...

AI Technical Summary

Problems solved by technology

[0004] The hard tinned sheet produced by the above-mentioned continuous annealing furnace (CA) is difficult to obtain a tinned sheet suitable for stamping because the heating and cooling are very fast during annealing (the general annealing time is 3 to 5 minutes).

[0005] Regarding the research on cold-rolled TH65 hard tinned plate, the corresponding literature and patents can be found at home and abroad, but all of them are produced by continuous annealing method, and the report of producing TH65 hard tinned plate by bell furnace annealing method haven't seen yet