FIELD: metallurgy.
SUBSTANCE: workpiece from hypoeutectoid carbon or low-alloyed steel with sulphur content at upper level of grade constitution is subject to hot rolling with reduction ratio of (δ)≥70%, further cooling at inter-critical temperature interval (ITI), exposure at that temperature interval during the period of time, which provides refining of ferrite due to transition of impurities from α-solid solution to γ-solid solution, and further tempering. Composite with volume ratio of hardening martensitic phase ~ 20-25%, as well as with length of drawn sulphur inclusions (Fe, Mn) S 1≥80 mcm, and with directivity of martensite and ferrite layers, the misorientation of which does not exceed 15 angular degrees, is obtained.
EFFECT: higher characteristics of crack resistance.
1 tbl, 1 ex
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD OF THERMOMECHANICAL TREATMENT OF HYPOEUTECTOID CARBON STEEL BILLETS | 0 |
|
SU767222A1 |
| SHEET STEEL FOR ARMOUR PROTECTION | 2020 |
|
RU2806620C2 |
| STEEL SHEET WITH HIGH MECHANICAL STRENGTH, DUCTILITY AND FORMABILITY PROPERTIES, PRODUCTION METHOD AND USE OF SUCH SHEETS | 2012 |
|
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| COLD-ROLLED STEEL PLATE WITH ZINC OR ZINC ALLOY COATING, METHOD OF ITS PRODUCING AND SUCH STEEL PLATE USE | 2012 |
|
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| COLD-ROLLED AND ANNEALED STEEL SHEET AND PRODUCTION METHOD | 2019 |
|
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| PROCEDURE FOR FABRICATION OF HIGH STRENGTH COLD-ROLLED AND ANNEALED STEEL SHEETS AND SHEETS MANUFACTURED BY THIS PROCEDURE | 2008 |
|
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| STEEL TREATMENT METHOD | 2000 |
|
RU2181776C2 |
| METHOD OF STEEL COMPLEX HEAT TREATMENT | 2011 |
|
RU2503726C2 |
| METHOD OF PRODUCING HIGH-STRENGTH SHEET STEEL, CHARACTERIZED BY HIGH PLASTICITY, DEFORMABILITY AND WELDABILITY, AND PRODUCED SHEET STEEL | 2018 |
|
RU2732261C1 |
| METHOD FOR PRODUCING HIGH-STRENGTH STEEL SHEET | 2023 |
|
RU2813064C1 |
