SU908931A1 - Structural steel - Google Patents

Description

(5) CONSTRUCTION STEEL

one

The invention relates to metallurgy, in particular to steels used for the manufacture of cast blanks of mechanical engineering parts.

Known steel And containing wt.%:

 Carbon 0.05-0.2 Manganese. 0.5-2 Silicon 0.2-0.6

Nickel0.3-1.5

Niobium 0.03-0.1

Aluminum 0.03-0.1. Nitrogen 0,015-0,03

Vanadium 0.03-0.1 Iron Other

Closest to the proposed is structural steel 12, containing, by weight;:

0.38-0 Carbon

0.8-1.1 Manganese 0, .17-0.37 Silicon

0.08-0.18 Vanadium 0.001-0.005

Bor 0.005-0.025

Nitrogen

Selenium 0.005-0.08

IronErest

After normalization, steel with the following composition has the following mechanical characteristics: dig 78 kg / mm, 65Gk, kg / mm, S 9.0, U 11.0%, and 3.3 kgm / cm.

The ductility and toughness of reduced steel is low. The use of more complex. Heat treatment does not increase the strength and ductility properties, only the classical regularity is observed, when strength increases - ductility decreases, and vice versa.

The purpose of the invention is to increase ductility and toughness at normal and negative temperatures while maintaining high strength.

Claims (1)

The goal is achieved by the HTO steel containing carbon silicon, manganese, vanadium, nitrogen, boron, selenium and iron, additionally 3 but contains zirconium, rare earth metals and calcium, in the following ratio of components, wt.% Carbon 0.15-0.40 Silicon 0.17-0.37. Manganese OiS-l, Vanadium 0.08-0.18 Nitrogen0.005-0.025 Bor0.001-0.005 0.005-0.08 Selenium 0.01-0.08 Zirconium Rare-earth0, 01-0.10 metals 0.03- 0.15 Calcium Rest Iron The chemical composition and properties of finished steels are represented by the face. 7 From the data in the table, it follows that the introduction of 0,010,08% in Zirconium steel, REM-0,01-0,10%, Calcium O ,, 15% leads to an increase in toughness at normal and negative temperatures and ductility due to a change in crystal lophysical characteristics of the metal The economic effect from the introduction of the proposed steel according to preliminary calculations will be more than .250 thousand rubles. per year due to the saving of alloying metals 30-70 kg n 1 t due to an increase in the utilization rate of the metal while reducing the CRI and the weight of the structure by an average of 5. The invention Structural steel containing carbon, silicon, manganese, vanium, nitrogen, boron, selenium and iron, in order to increase plasticity and toughness at normal and negative temperatures, it additionally contains zirconium, rare earth metals and calcium in the following ratio of components, weight D: Carbon 0.15-0-0, Silicon AO 0.17-0.37 M arganets 0, 1 Vanadium 0.08-Q, 18 Nitrogen 0,005-0,025 Bor 0,001-0,005 Selenium 0,005-0,08 Zirconium 0,01-0,08 Rare-earth metals 0, 01-0,10 Calcium 0.03-0, 15 Iron Else Sources of information taken into account during the examination 1. USSR author's certificate No., cl. C, 22 C 38/12, 19692, USSR Copyright Certificate No. it9086V, cl. C 22 C 38/60,.