SU1008273A1 - Steel - Google Patents

Abstract

STEEL containing carbon, silicon, manganese, chromium, nickel, alkali, tigan, calcium, rare earth metals, and iron, which, in order to increase machinability, heat resistance, long-term durability and foundry properties, it also contains copper , selenium and nibbium in the following ratio of components, wt.%: O, 35 - 0.50 Carbon 2.0 - 3.0 Silicon 0.30 - O, 70 Manganese Chromium 8.0 - 1O, O Nickel 0.10 - 0.50 Aluminum 0.01 - 0.05 0, O1 - O, 10 Titanium Calcium 0.005 - 0, O5 Rare-earth 0.005 - 0.08 metals 0.10 - 0.30 Copper 0.05 - 0.20 Selenium (L Niobium 0.005 - 0.05 Iron Ostal th

Description

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This invention relates to metallurgy casting production, in particular to the search for foundry heat-resistant steels with improved properties and good cutting ability.

Known casting martensitic steel ll, containing, wt.%:

O carbon 35 - 0.50

Silicon2.0 - 3.0

ManganeseO.ZO - O, 70

Chrome 8, O - 10.0

NickelNo more than 50

CopperNot more than 0.30

IronErest

This steel is mainly used in the manufacture of castings, operating for a long time under load at temperatures up to 700 ° C, naprtamer, valves, olosnikov, fixing castings, etc.

In this case, heat treatment is not subjected to casting.

Closest to the proposed technical essence and the achieved effect is steel 2J, containing wt.%:

Carbon 0.16 - 0.45

Silicon, 17 - 0.7

Manganese 0.3-0.6

Hrsz 12-14,

Nickel, 1 - 1, O

AluminumOZ, OZ - O, O8

Titan O, O1 - O, 1

Calcium OO5 - 0.08

Magnesium, O05 - O, 05

Rare-earth metals 0, O05 - O, 1

IronErest

Significant disadvantages of this steel are unsatisfactory machinability and relatively low heat resistance, long-lasting hardness and casting properties.

The purpose of the invention is to increase the machinability of self-absorption, heat resistance, long-term strength and casting properties.

In order to achieve this goal, martensitic cast steel, containing carbon, silicon, manganese, chromium, nickel, aluminum, titanium, calcium, rare earth metals and iron, also contains copper, selenium and niobium in the following ratio of components, wt.%:

Carbon 0.35 - 0.50

Silicon2.0 - 3.0

. Manganese, ZOR - 0,70

Chrome 8, O - 10.0.

Nickel0,1O - 0,5O

AluminumO1 - O, 05

Titanium .O, O1 - 0.10

Calcium OO5 - 0.08

Rare-earth metals 0, ОО5 - 0.08

Copper0,1O - O.ZO

Selenium 0.05 - O, 2O

Niobium 0.05-0.20

IronErest

Experienced steels were smelted in a 160 kilogram induction furnace by remelting.

The chemical composition of the experimental steels is given in table. one.

The smelted compounds were examined 5 for machinability, heat resistance at 9OO ° C, long-term strength. at 700 C and casting properties.

The machinability is determined by the flow of cylindrical specimens with a diameter of 30 mm and a length of 250 mm using high-speed steel cuts.

The result is determined by the weight loss of the incisors, as well as the quality of the machined surface.

5 The test results on machinability are given in table. 2

From tab. 2 it can be concluded that the proposed steel exceeds the known steel 0 in machinability. This is indicated, in particular, by approximately equal wear of the high-speed steel cutter when machining samples of the proposed steel at a speed of 16 m / min, while the cutting speed of specimens from the known steel is 19.5-21.5 m / min. At the same time, the surface finish of samples from the proposed steel after turning is increased by grade .1-2.

The test results on heat resistance and casting properties are given in table. 3.,

Long-term strength is determined on standard specimens with a diameter of 10 mm.

Heat resistance is estimated by the weight loss of the cast samples at 90 ° С | after soaking them for 2OO and 5OO h.

Fluid fluidity determined by the length of the filling of the liquid steel with the experimental results of the conventional spiral sample.

The test results are shown in Table. 3

The smelting technology of the proposed foundry martensitic steel does not practically differ from the known one.

Thus, the proposed steel has a more EYLSOKY level of investigated properties compared with the known steel, which makes it an effective substitute for itpK manufacturing casting parts of the steel bars, valves, fasteners and other working for a long time under load at elevated temperatures.

For example, for the life of a cat. Guyam steel surpasses the known steel by -33-4О%, by heat resistance (reduced weight loss) by 25% and long-term strength by 40%. As a result, “this provides an improvement in the quality of casting, and the economic effect according to preliminary calculations is about 8.5 thousand rubles. in year.

iT a l and c a 1.

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T a.b l and c a 3

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Offered

Claims (1)

STEEL containing carbon, silicon, manganese, chromium, nickel, aluminum, titanium, calcium, rare earth metals, and iron, characterized by with the fact that, in order to improve cutting resistance, heat resistance, long durability and casting properties it additionally contains copper, selenium and niobium in the following relation components, wt.%: Carbon 0.35 - 0.50 Silicon 2.0 - 3.0 Manganese 0.30 - 0.70 Chromium 8.0 - u oh Nickel 0.10 - 0.50 Aluminum 0.01 - 0.05 Titanium 0.01 - 0.10 Calcium 0.005 - 0.05 Rare earth metals 0.005 - 0.08 Copper 0.10 - 0.30 Selenium 0.05 - 0.20 Niobium 0.005 -  0.05 Iron Rest SU a »lflfl & 273> '2 0.01 - 0.10 0.005 - 0.08 0.35 - 0.50 2.0 - 3.0 0.30 - 0.70 8.0 - 10.0 No more than 0.50 Not more than 0.30 Remaining steel [_2j containing 14, 1,0 0.16 - 0.45 0.17 - 0.7 0.3 - 0.6 12 0.1 0.03 - 0.08 0.01 - 0.1 0.005 - 0.08 0.005-0.05 1 1008273