SU1388455A1 - Steel - Google Patents

Description

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This invention relates to metallurgy, in particular, to the composition of steel for the manufacture of cold rolled steel rolls.

The purpose of the invention is to increase the bending strength, hardenability and service resistance of steel,

The alloyed steels were cast into an alloy. The proposed steel is 1.4–1.8 times less contaminated with non-metallic inclusions, with almost identical hardness it has a 13–25% higher bending strength, 1.2–1.9 times more high hardenability and 12.8-31.5% higher operational durability in rolls

ki weighing 40 kg. The chemical composition of cold rolling as compared with that of gfiveden in the table1.

The ingots were forged on rods with a cross section of 70X70 mm, from which templates were cut out to control the macrostructure,. Slices for determining the content of 15 non-metallic inclusions and the preparation of samples for mechanical testing and hardenability using the face hardening method

The total content of non-metallic inclusions was determined as the sum of sulfides and oxides, oxysulfides, and nitrides using method P in accordance with GOST 1778-70, After thermal equilibrium steel.

Claims (1)

Invention Formula cove Steel predominantly for carbon-containing shaft-silicon. processing of the sample blanks according to the mode of 25 wt.%; manganese, chromium, molybdenum, vanadium, rare earth metals, iron, o and l so that, in order to increase the flexural strength, hardenability and service resistance, it additionally contains calcium, niobium, tantalum and boron in the following ratio of components For cold rolling rolls consisting of thermal improvement (quenching from 880 ° C and tempering at 700 ° C) and hardening from 920 ° C and tempering at 180 ° C, the hardness and bending strength were determined. The results of determining the content of nonmetallic inclusions,. ,, mechanical properties and hardenability are given in Table 2c. Also, a series of industrial heats of the proposed and known steel was produced, the steel was cast into ingots of mass “From the ingots cold rolls for mill 1700s were made. The test results of the operational durability of the rolls in tons of rolled steel sheet are given in Table 2. famous steel. Invention Formula cove Steel predominantly for carbon-containing shaft-silicon. manganese, chromium, molybdenum, vanadium, rare earth metals, iron, o and l so that, in order to increase bending strength, hardenability and operational durability, it additionally contains calcium, niobium, tantalum and boron in the following ratio of components 0 five Carbon Silicon Manganese Chromium Molybdenum Vanadium Rare-earth metals Calcium Niobium Tantalum Bor Iron 0.50 - 0.80 0.40 - 1.60 0.20 - 0.70 0.80 - 3.20 0.20 - 0.90 0.05 - 0.30 0 0.005-0.060 0.002-0.010 0.02 - 0.20 0.001-0.050 0.001-0.005, the Rest, provided that the total content of vanadium, niobium and tantalum is 0.25-0.37, the ratio of the total calcium and rare earth metals to sulfur 0.5-5, t a b l a n a t 6lit2