SU985131A1 - Steel composition - Google Patents

Description

The invention relates to ferrous metallurgy, in particular to the search for the steels used to make cast dies.

Known use for cast dies steel 5HNM, 5H2NMF, ZOH2NMF and 27H2NMVF 1.

Closest to the proposed technical essence and the achieved effect is steel C2 composition, weight .:

Carbon 0.1 - 1.2

Manganese 0.2 - 2.0

Silicon 0.005 - 2.0

at least one item

from the group:

3.0

0.03

Chromium

0.03

1.0

Molybdenum 3.0

0.03

Nickel 0.3

0,005

Vanadium 0.2

0.03

Aluminum

0,0005- 0,003

Bor 0.03 - 1.0

Copper

(St) STEEL

Titan or

Zirconium 0.01 - 0.035 Iron Rest A disadvantage of the known steel is the relatively low mechanical properties, especially impact strength and tensile strength, at elevated temperatures.

The purpose of the invention is to increase thermal stability and toughness.

This goal is achieved by the fact that steel containing carbon, silicon, manganese, chromium, molybdenum, nickel, vanadium, aluminum, iron, is additionally 15 (contains nitrogen, calcium, magnesium in the following ratio of components, wt.%:

Carbon0, - 0.80

Silicon0.15 - 0.50

2C

Manganese 0-, - 0,90

Chrome 0.50-1.0

Molybdenum 0.15 - 0.30

Nickel 1.0 - 2.0 985 0.25 Vanadium 0.03 Aluminum 0.009 - 0.03 0.009 - 0.0V Calcium 0.005 - 0.05 0.003 - 0.008 Magnesium Iron Else The ratio of the vanadium content to nitrogen retention is 3-6. Table 1 shows the chemical compositions of the proposed and known steels. Table 2 presents the mechanical properties of the proposed and known steels at elevated temperatures. and toughness at room temperature (heat treatment - hardening 920 ° С, tempering 580С /. From table. 2, it can be seen that the proposed steel has a higher level of toughness and strength values than is known. Higher heat resistance and toughness it allows to increase the durability of cast dies by 2-3 times. The expected economic effect from the implementation of the invention is 200 thousand rubles.

table 2

Offered

Claims (2)

1. Steel containing carbon, silicon, manganese, chromium, molybdenum, nickel, vanadium, aluminum, iron, characterized in that, in order to improve heat resistance and toughness, it additionally contains nitrogen, calcium, magnesium in the following ratio of components , weight.%: Carbon 0.40 - 0.80 Silicon 0.15 O, 50 Manganese 0.40 - 0.90 Chrome 0.50 - 1.0 Molybdenum 0.15 - 0.30 I, 0 - 2.0 Nickel 0.03 - 0.25 Vanadium 0.009 - 0.03 Aluminum 0,009 - 0, Nitrogen 0,005 - 0,05 Calcium 0.003 - 0.008 Magnesium Else Iron 2. Steel according to claim 1, characterized in that the ratio of vanadium to nitrogen is 3-6. Sources of information taken into account in the examination 1. GOST 5950-73. 2. Patent of England No. 1098952, cl. S7A, 1969.