SU652235A1 - Steel - Google Patents

Description

(54) STEEL

one

The invention relates to metallurgy, in particular to iron alloys, to steel for pipelines, such as for the manufacture of gas pipes of large diameter.

Closest to the described invention to the technical essence and the achieved effect is steel containing, wt.%:

Carbon 0.12-0.16

Manganese1,2-1,7

Silicon0,2-0,35

Chrome 0.05-0.8

.Nickel0.05-0.8

Copper 0.05-0.8

AluminumO, 0.1-0, 05

Nitrogen 0,01-0,02

Vanadium 0.02-0.08

Niobium 0.01-0.05 Calcium0.005-0.05

IronErest

Known steel has the following mechanical properties in the hot rolled state:

- Strength limit kg / mm Yield strength, kg / mm Relative elongation, Impact viscosity at, kgm / cm

The disadvantage of this steel is low mechanical properties.

The aim of the invention is to increase the mechanical properties in the hot rolled state.

The goal is achieved by the fact that steel containing carbon, manganese, silicon, vanadium, niobium, molybdenum, aluminum, nickel, chromium, nitrogen, calcium and iron, additionally contains cerium in the following ratio of components, weight,%:

0.05-0.12

Carbon,.

five

1.2 -2.0

Manganese

0.15-0.60

Silicon

0.04-0.12

Vanadium

0.01-0.08

Niobium

0,005-0,13

Molybdenum

0.01-0.06

Aluminum

0.02-0.50

Nickel

0.02-0.50

Chromium

0,008-0,025

Nitrogen

0,001-0,030 Calcium

0,002-0,040 Cerium

The rest of the iron

Steel may contain sulfur up to 0.010% and phosphorus as impurities.

30 to 0.020%.

Experimental melting of steel is smelted in induction furnaces, the chemical composition of KdTOpHx is given in Table 1.

Steel rolled in a controlled mode on a sheet thickness of 12 mm. The mechanical properties of steel are given in table 2.

Claims (1)

When comparing the values of the mechanical properties of the proposed steel with the properties of a known steel, it can be seen that 10.07 2.0 0.3 0.04 0.08 0.070 0.3 20.05 1.8 0.6 0.12 0.02 0.005 0, 5 30.12 1.2 0.15 0.08 0.06 0.13 0.02 Claims of Invention Steel containing carbon, manganese, silicon, vanadium, niobium, molybdenum, aluminum, nickel, chromium, nitrogen, calcium and iron, characterized in that, in order to improve the mechanical properties, it additionally contains cerium in the following ratio of scientific research institute components, wt.%: Carbon 0.05-0.12 Manganese 1.2-2.0 522354 that the strength characteristics increase by 5-6 kg / mm With regard to the values of the shock resistance at negative temperatures, the proposed steel meets the requirements for its operation in the North. Because of the low 5 carbon equivalent sheets of the steel offered is easy to weld. Due to the economy of metal and increase of durability, the sum of the expected economic effect is about 250 thousand rubles. Table T a b l q 0.02 0.025 0.06 0.001 0.040 0.01 0.015 0.20 0.016 0.04 0.0200.002 0.009 0.012 0.50 0.010 0.01 0.030 0.020 0.007 0.037 0.15-0.60 Silicon 0.04-0.12 Vanadium 0.01-0.08 Niobium 0.005-0.13 Molybdenum 0.01-0.06 Aluminum, 0.02-0.50 Nickel 0.02-0.50 0.008-0.025 0.001-0.030 Calcium 0.002-0.040 Iron Rest,