SOFT BLACK SHEET IRON WITH HARDNESS HR 30T, WHICH IS 51±3, FOR BLANCHING AND METHOD FOR ITS MANUFACTURING Russian patent published in 2010 - IPC C22C38/14 C21D8/02 C21D8/04 C21D9/48 C25D3/30 C23C2/08 

FIELD: metallurgy.

SUBSTANCE: there is molten steel, containing following components, wt %: carbon ≤ 0.005, manganese 0.20 - 0.30, aluminium 0.03 - 0.06, silicon ≤ 0.03, titanium 0.038 - 0.06, phosphorus ≤ 0.012, sulphur ≤ 0.015, nitrogen ≤ 0.003, oxygen ≤ 0.004, iron and unavoidable admixtures are the rest and it is implemented its pouring at yield temperature 1190 - 1250°C with receiving of slab. It is implemented hot rolling of slab into strip at final rolling temperature 880-920°C. It is unwinded strip into reel at temperature 560 - 620°C. It is implemented etching, cold rolling with reduction ratio at a level 82 - 92%, continuous annealing at temperature 730 - 760°C during 25-50 seconds and training with lengthening of strip for 1.2 - 2.2%.

EFFECT: there is provided required hardness of sheet iron.

10 cl, 9 tbl, 6 ex