SU1289907A1 - Steel - Google Patents

Abstract

The invention relates to the field of metallurgy and can be used for the manufacture of drilling tools and other parts in critical components of machines and mechanisms. The aim of the invention is to increase the contact durability and workability of steel. An increase in these characteristics is achieved by additional alloying of the steel with zirconium and nitrogen. The steel has the following chemical composition, wt.%: From 0.4-0.5; Si 0.17-0.37; MP 0.4-0.7; Cr 0.8-1.5; Ni 1.6-2.8; Mo 0.1-0.3; V 0.08-0.15; Ti 0.01-0.02; REM 0.01-0.03; W 0.05-0.1; Zr 0.01-0.05; N 0.02-0.1; Fe - the rest. 2 tab. (L

Description

The wok was determined after quenching in oil at a temperature of 880 C and tempering at 200 ° C.

Table 1

112899072

The invention relates to metallurgy-rare-earth metals - in the form of master alloys. Gies were obtained and could be used for casting 5 heats of steel (see Table 1). The design of the drilling tool and the manual properties of the resulting parts in the responsible nodes of machines and mechanisms.

The purpose of the invention is to increase the contact durability and workability of steel.

In the proposed composition with

the proposed ratio of components 0 The component nitrogen and zirconium forming zirconium nitrides reduces the number of large inclusions of irregular and acute-angular shape, which leads to an increase in contact durability. The formation of a large number of small inclusions significantly increases the total area occupied by nonmetallic inclusions, which contributes to chip shrink during cutting at lower loads on the cutter, increasing tool life and workability.

In addition, when machining the steel by cutting, zirconium nitrides, which fall directly into the contact area of the tool and parts, serve as a lubricant, replacing the process of dry friction of surfaces while turning with a process of friction with lubricant, which contributes to an increase in surface cleanliness and improved workability.

The investigated steels were smelted in a 40-pound induction furnace with a base lining. Silicon, manganese-35, chromium, molybdenum, and vanadium were introduced in the form of ferroalloys. Titanium was introduced in pure form, nitrogen - in the form. The test results are given in nitrided ferrochrome, zirconium, table. 2

thirty

The wok was determined after quenching in oil from a temperature of 880 C and tempering at 200 ° C.

Table 1

REM - in the form of ligatures. 5 heats of steel were obtained (see Table 1). The design properties of the resulting plan

table 2

Relative wear resistance () was determined under rolling friction with 10% slip according to the disk pattern on a disk in an environment of drilling mud with an abrasive. The test base is 2x10 load cycles. Depreciation was determined by a gravimetric method. The relative wear resistance was calculated by the formula

, - uWjicn

V- "-. L-.

 Uw ,,

 , bW is the weight loss of the test and reference samples, respectively.

The machinability was studied after tempering at a temperature of 650 ° C for 4 hours. The main criterion for evaluating the machinability was chosen to be the functional dependence of temperature on feed, speed and depth of cut during turning.

Analysis of the data obtained shows that the proposed steel has a good combination of contact durability, and machinability, high

Compiled by S. Derkachev Editor N. Kishtulinets Tehred V. Kadar Proofreader A. Zimokosov

Order 7872/26 Circulation 627 Subscription

VNIIPI USSR State Committee

for inventions and discoveries P3035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

values of strength, impact strength and wear resistance.

et e and

Claims (1)

Formula images Steel, containing carbon, silicon, manganese, chromium, nickel, molybdenum, vanadium, titanium in rare earth metals, tungsten and iron, characterized in that, in order to increase contact durability and workability, it additionally contains zirconium and nitrogen in the following ratio components, May.%: five 0 five Carbon Silicon Manganese Chrome Nickel Molybdenum Vanadium Titanium Rare earth metals Tungsten Zirconium Nitrogen Iron 0.4-0.5 0.17-0.37 0.4-0.7 0.8-1.5 1, 6-2,8 0.1-0.3 0.08-0.15 0.01-0.03 0.01-0.03 0.05-0.1 0.01-0.05 0.02-0.1 Rest.