HIGH STRENGTH DIP GALVANIZED STEEL PLATE WITH EXCELLENT CHARACTERISTIC OF IMPACT STRENGTH, AND METHOD OF ITS MANUFACTURING, AND HIGH STRENGTH ALLOYED DIP GALVANIZED STEEL PLATE AND METHOD OF ITS MANUFACTURING Russian patent published in 2015 - IPC C22C38/04 C22C38/58 C23C2/02 C23C2/06 

FIELD: metallurgy.

SUBSTANCE: steel plate has dip galvanized layer made on surface of the base steel plate containing in wt %: C from 0.075 to 0.400, Si from 0.01 to 2.00, Mn from 0.80 to 3.50, P from 0.0001 to 0.100, S from 0.0001 to 0.0100, Al from 0.001 to 2.00, O from 0.0001 to 0.0100, N from 0.0001 to 0.0100, and rest is for Fe and inevitable contaminating admixtures. The base steel plate has structure of the steel plate in range from 1/8 of thickness to 3/8 of thickness with centre about 1/4 of thickness through the plate thickness from the surface. Phase volume fraction of the residua austenite is 5% or below, and total volume fraction of the beinite phase, beinite ferrite phase, fresh martensite phase and tempered martensite phase is 40% or over.

EFFECT: production of steel plate with increased characteristic of impact strength at low temperature, and with ultimate tensile strength 900 MPa or over.

12 cl, 28 tbl