SK91993A3 - High-alloy manganese abrasion resistant steel - Google Patents

Abstract

This high-alloy abrasion-resistant manganese steel for parts exposed during the working process to abrasive wear with the co-action of pressure and shocks contains a percentage by weight as the basic components 1.10 to 1.50 % of carbon, 15.00 to 20.00 % of manganese, 0.30 to 1.00% of silicon, 0.30 to 2.50 % of chromium, 0.020 to 0.10% of aluminium, the rest is iron, and it also contains in percent by weight permissible harmless components: traces up to 1.50% of nickel, traces up to 2.50% of molybdenum, and traces up to 0.80% of copper, and harmful components: phosphorus with an upper permissible limit of content by weight of 0.080%, and sulphur with the upper permissible limit of content by weight of 0.015%.

Description

High-alloy manganese wear-resistant steel

Technical field

The invention relates to highly alloyed manganese (Mn) steel applicable to wear-resistant parts subjected to abrasive wear in the working process under the influence of high pressures and impacts, preferably used for thick-walled parts.

I

BACKGROUND OF THE INVENTION

It is known that steels containing more than 1% C and 10% Mn after a suitable heat treatment have a high toughness and a surface, impact and compression strength. It is preferred to use steels containing 15-25% Mn, optionally alloyed with another carbide forming element e.g. Cr, Mo and others.

Along with the increase in% Mn, however, the tendency of these steels to develop a dendritic structure increases, and this is associated with a decrease in mechanical values and wear resistance. This metallurgical phenomenon is substantially amplified by increasing component thickness. The resulting dendritic structure cannot be removed by heat treatment and represents a significant risk of fracture of abrasion-resistant parts.

SUMMARY OF THE INVENTION

According to PV, the method of solving this problem is metallurgical in nature. chemical composition of steel. In this sense, it has been tried to influence the elements V, Zr, Ti, Nb, Ca to refine the structure.

According to the invention, it is suitable to use for the basic composition of Mn steel the cross-over elements V, Ti, B in a certain amount by weight so that all elements are contained in the steel in a total weight percentage up to 0.25%, the rest Fe.

DETAILED DESCRIPTION OF THE INVENTION

The exemplary embodiment of the invention has been verified on the following four test melts:

weight%

elements Pr. Č.L no. 2 no. 3 no. 4 C 1.23 1.38 1.4 1.32 LLN 18, 60 17, 40 17, 2 17, 05 Are you 0, 75 0, 80 0, 65 0, 70 P 0, 042 0, 048 0, 051 0, 080 with 0,008 0, 006 0, 008 0,005 Cr 0, 69 2, 05 2, 50 1.85 in 0, 16 0.10 0, 18 0, 03 you 0, 04 0, 08 0, 05 tracks ^B 0, 005 0, 003 0.002 tracks

The deoxydation of the steel was carried out in the Al furnace both before the addition of FeMn, FeCr, FeV and in the Al pan simultaneously with the addition of FeTi and FeB. The pouring temperature is as low as possible, i. 1490 - 1530 ° C, but it must correspond to the casting thickness and weight. The quality of the deoxydation as well as the control of the casting temperature make it possible to use lower doses of micro-alloying elements and allow them to have a significant influence on the steel structure.

Structure tests were performed on 100 x 100 x 1500 mm cast prisms. In the steel of Example 4, a dendritic structure occurred up to the middle of the casting. For the test castings / 40 x 40 x 100 mm, also in Example no. 4 significantly less pronounced dendritic structure.

In heat treatment annealing to a temperature of 1050 by cooling in water, Bond abrasion resistance was obtained. standard material is steel ČSN consisting of austenizer - 1130 ° C followed by quick samples for detection The abrasive served as the abrasive, 12050.

Results of relative abrasion resistance:

steel according to pr.1 abr. - 5.06 abr. - 5.38 abr. - 5,70 abr. - 4,65

The highly alloyed Mn abrasion-resistant steel according to the invention is advantageous for wear-resistant parts such as e.g.

Reflective crushing bars crushed.

for jaw, cone and hammers

Furthermore, for all purposes of the use of the 1st stage shredder, the workpieces are resistant to high impact equipment, e.g. crushing construction demolition roads and airfields and the like.

Claims (3)

PATENT 1. High-alloy Mn oteruvzdoruj úca steel on the wear - resistant parts exposed to abrasive wear in the working process. pressures and impacts indicated by including the main elements in the range C 1.10 to 1.50% - Mn 15.00 to 20.00 % Are you 0.30 to 1.00% J Cr 0.30 to 2.50% A1 0.020 to 0.10% permissible, harmless elements in the range of: Ni max. 50 % Mo max. 0 10 Cu max. 0 30 and harmful in limited quantities P max. 0.080% S max.0.015%. High-alloy Mn abrasion-resistant steel according to claim 1, characterized in that it also comprises cross-limiting elements in the range of = V 0, 10 to 0, 20% Ti 0.020 to 0.10 = B 0.001 to 0.005. High-alloy Mn abrasion-resistant Qcel according to claims 1 and 2, characterized in that in the sum of% V +% Ti +% B it contains max. 0.25%, other Fe.