SU529258A1 - Steel - Google Patents

Description

(54) STEEL

The invention relates to the field of ferrous (metallurgy, in particular, to the production of (structural steel) and can be used in the shipbuilding, power generation and other industries of the industry. At present, vessels and other structures of power plants operating under high pressure ( up to 350 ° C) temperatures, made of heat-resistant pearlitic steels. The fabrication of KOHt structures from these steels is associated with the need for high heating during welding and immediate tempering after welding, which is It makes it difficult to continuously and complicates the manufacturing tehiologgiyu structural element 15 with a large sectional thickness, steel grade known 18H2NCHMA which has nizkiemehanicheskie svaroch and s-but-1 processability.

Also known is steel containing, weight%: 20

Carbon0.01-0.25

Silicon, O5-O, 6

Manganese 0.3-3

Chrome 1-8

Nickel0.1-425

L olibden. 0.1-1.5

Copper0,1-1,5

One or more items selected from the | group:

Vanadium Do Oh 3

Niobium Up to 0.7

Aluminum Up to 0.15

Iron Else 2.

However, this steel has low strength, ductility, tempering resistance in thicknesses up to 5OO mm, as well as the dissolution of BOpliTenbHbie welding and technological cBoflk IcTBa.

The purpose of the invention is to increase the strength, ductility and tempering resistance in thicknesses up to 5OO mm, as well as to improve the welding process properties.

This is achieved by the fact that the proposed | Steel additionally contains nitrogen, titanium and yttrium in the following ratio of components, weight. %:

Angle erod0,12-0,18

Silicon, 05-O, 37

Manganese 0.3-1.6

Molybdenum 0.5-2.0

2.0-3.0 0.5-1.5 0.05-0.25 0.001-0, OZ 0.005-0.15 0.001-0.20

77.4

88.1

Known

We offer steel on samples, such as ilV GOST after quenching 90 ° llOOO ° C into water, tempering at 630-680 ° C and after extra technological rycKoB, i in thickness up to 5OO mm has very low properties: 2

 Tensile strength at 350 ° C bocgs / mm

Impact viscosity at –20 ° C 6 kgm / cm

Formula and 3 about Ip Ife n and i

Steel containing carbon, silicon, (Manganese, molybdenum, xpoMj H1shel, vanadium,: aluminum and iron, characterized in that, with the aim of increasing the sturdiness, ductility and tempering resistance | In thicknesses up to 500 mm properties, it) additionally contains; nitrogen, titanium and

Yttrium

0,005-0,20 Else Iron

The mechanical characteristics of the proposed and known steels are given in the table.

8.1

57.2

16,1

.Stitch in the following ratio of components, weight,%.:

Carbon

0.12-0.18

0.05-0.37 Silicon

Manganese

0.3-1.6

0

Molybdenum

oh 5-2

Chromium

2.0-3.0i

0.5-1.5

Nickel

0.05-0.25

Vanadium

Nitrogen 0,001-0,030

5 O, SZ O 5-0.15

Titanium

Aluminum 0,001-0,20 And ttriy O, OO5-0,20

Iron Else

0

Sources of information received in the book .manie during examination:

1. Steel grade 18Х2НЧМА, GOST: 4 5 4 3-48

2. Japanese patent number 7832, M CP

five . 10 J .. 172.1969 .;