SU899703A1 - Steel composition - Google Patents

Description

(54) STEEL

The invention relates to metallurgy, more specifically to the search for structural steels of improved quality, possessing high strength and plastic characteristics, high resistance to atmospheric corrosion and intended for the manufacture of metal structures, such as lining of mine workings from special interchangeable profiles (EHI).

Low alloy steel for special profiles should ensure the safe operation of the shaft support, taking into account its repeated use in the existing technology of manufacturing and restoring elements by bending and straightening in a cold state. The more the steel lasts without breaking the cycles consisting of the deforming and restoring, the more times it can be used in the rebuilt arch support. This allows a significant increase in e (|) (}), the efficiency of the use of lining, and also its safe operation.

Known step ll, containing, wt.%:

0.31-0.40

Carbon 1.4-2.0

Manganese 0.02-O, O9

Silicon 0.05-0.40

Copper 0.05-0.40

Chrome 0.001-0.02

Niobium Rest

Iron is close to the proposed

Most

technically (the essence and the effect achieved is steel 2, containing, by weight,%:

0.15-0.35

Carbon 0.8-1.6

Manganese 0.02-0.15

Silicon O, 08-O, 4O i

Chrome O, 03-O, 40

Copper Oh, O2-O, 15

Vanadium O, OOZ-O, O25

Nitrogen 0.02-0.20

Nickel Else

Iron A disadvantage of the known steel is the low atmospheric corrosion resistance under the conditions of the mines and the insufficient ductility of the profile during repeated bending. ,

The purpose of the invention is to increase the resistance to atmospheric corrosion and improve the ductility of steel when repeatedly bending.

The goal is achieved by the fact that steel containing carbon, margane silicon, chromium, copper, vanadium, nitrogen, nickel and iron, additionally contains a mouse for the following ratio of components, weight. %:

Carbon, 10-O, 25

Manganese, 8-1,6

Silicon O2-OD 5

Chrome, O2-O, 4O

Copper, 02-O, 4O

Vanadium, O5-O, 15

Nitrogen, O1O-0, O25

Nickel, O2-O, 20

Mouse kO, O5-O, 25

IronErest

In the laboratory electric furnaces with a capacity of 1.5 tons were produced, the smelting of the proposed steel.

The metal of the proposed and famous steel is rolled under identical conditions on the special profile SVP-17.

Studies on inclination to atmospheric corrosion were carried out on the same type of samples in air, simulating the atmosphere of coal and ore mines in temperature, composition and humidity. Time comparative tests 51OO h.

In order to study the ability of the SVP-17 special steel from the proposed and well-known steels to withstand multiple edge bending and restoration, two types of tests were carried out:

a) flat standard samples according to GOST 14019-64 were subjected to repeated dense bending at 180 with the diameter of the mandrel equal to three thicknesses of the samples, and subsequent restoration up to the destruction of the metal;

b) the straight lines 1,5 metros from cutting the special profile were subjected to multiple bending and restoration, including the destruction of the metal,

When comparing the capacity for multiple restoration, the special profile of testing beams from the proposed and known stele was carried out according to a tightened Ht 4y mode - BEFORE a deflection of 15 mm.

The chemical composition and results of corrosion and mechanical tests of rolled metal samples of melts in comparison with known steel are given in Table. 1 and 2.

The special steel of the proposed steel was kept in a cold state of 1011 deformations until destruction instead of 7-8 for the known.

Table 2

Claims (1)

Claim Steel containing carbon, manganese, silicon, chromium, copper, vanadium, nitrogen, nickel, iron, characterized in that, in order to increase the resistance to atmospheric corrosion and improve plas- ticity ³⁰ flex, it also comprises arsenic in the following ratio components, weight. %: Carbon 0.10-0.25 Manganese 0.8-1.6 Silicon 0.02-0.15 Chromium 0.02-0.40 Copper 0.02-0.40 Vanadium 0.05-0.15 Nitrogen 0.010-0.025 Nickel 0, 02-0.20 Arsenic 0.05-0.25 Iron Rest