DD206165A1 - MANGAN ALUMINUM MULTI-BRAND FOR SHIP PROPELLERS, ESPECIALLY FOR HIGH-LOADING SHIP PROPELLERS - Google Patents

Abstract

The invention relates to a MN-Al-MULTI-FUEL BRONZE FOR SHIP PROPELLERS, ESPECIALLY FOR HIGH-LOADABLE LARGE FIXING AND ADJUSTING PROPELLERS. The goal was to cut the proposed MATERIAL to further develop THAT ER while maintaining the already demonstrated positive effects even for ship propellers ice class and according to the IACS REGULATORY 120 CU-CATEGORY 4 USED AND THAT Accordingly, the new material have a minimum elongation at break of 19 % AVAILABLE. THE TASK WAS TO ACHIEVE THE REQUIRED VALUES BY CHANGING THE CHEMICAL COMPOSITION. IT WAS FOUND THAT BY REDUCING THE WEIGHT OF THE ALLOY COMPONENTS ZN TO 2.0 TO 5.5% BY WEIGHT, AND FOR AL TO 6.0% TO 7.0% OF THE DESIRED EFFECT. AS A PRACTICAL TOLERANCE, A NEW ALLOY FOR THE OPERATION REFERRED TO HEREIN, WITH SUBSEQUENT CHEMICAL COMPOSITION, WAS THEREFORE DETERMINED. MN = 10.0 TO 11.0% by weight, ZN = 2.0 to 5.5, INS. 3.5 to 4.5% by weight, FE = 2.0 to 3.0, NI = 1.5 to 2.5, AL = 6.0 to 7.0, INS. 6.5 to 7.0% by weight, C = 0.03 to 0.15, REST CU.

Description

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Title:

Manganese Al with inium bronze bronze for ship propellers, especially for heavy-duty ship propellers

Field of application of the invention:

The invention relates to a manganese-aluminum multi-substance bronze (hereinafter called Mn-Al multi-substance bronze) for ship propellers to BD-PS 154 548, in particular for heavy-duty ship propellers.

Characteristic of the known technical solution; The Mn-Al multi-fuel bronze to QD-PS 154 548 was developed specifically for marine propeller, which has the good melting and pouring property in its production and can be easily processed without additional heat treatment. Due to the low elongation at break of this material of = 15 % , this material does not meet the classification requirements for ship propellers of the ice class and the international IACS regulations 120 for ship propellers with the highest demands of the Cu category 4 ·

Object of the invention

The aim of the invention is to further develop the material according to BD-PS 154 548 so that while retaining its positive properties, in particular the good corrosion, Ka-vation and erosion resistance and the favorable properties in terms of its production this aosch for large heavy-duty fixed propellers as well as for variable pitch propellers while complying with the requirements of the classification regulations, in particular for ice classes and the lACS regulations, 120

Characteristic of the technical solution:

3ü The object of the invention is based on the material Mn-Al-Mehrstoffbronze for ship propeller according to öD-PS 154 546, this is by changing its chemical composition for ship propellers

- & H9 - ^Q -2 * 'Ü3 £ i0-S ~

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of any diameters and for maximum load, in particular for ship propellers with and without ice class and according to the JACS regulations. To develop 120 for Cu category k · Babel is to ensure an elongation at break of at least 19 ».

It has been found that the task can be solved by a targeted change in the alloy components of the ¥ erkstoffes after SD-PS 15 ^ 548 for zinc and aluminum, in particular by reducing their weight percent. The reduction of the weight proportions was accordingly carried out at Zn to 5j5 to 2.0 weight percent and in Al to 7.0 to 6.0 weight percent. By this targeted modification of the alloying proportion of Zn and Al, it is possible to ship propellers from a Mn-Al multi-material bronze for all applications and sizes including ship propellers with and without sis class and according to the provisions of IACB *

The achievable with the change in the chemical composition positive effect is that at a lower. Al content and Zn content and while retaining the good strength properties at the same time the elongation at break can be increased substantially to = 19,9> bainite, this "value is above the internationally required ¥ erated and thus fulfills the condition of the above classification according to IACS and for ship propeller with ice class · At the same time, a positive economic effect is achieved since, starting from the cheaper starting material used, the new material can be produced more cost-effectively compared with the materials used hitherto *

Afterwards, the chemical composition as well as the achieved mechanical characteristics are to be mentioned again by an example of a ship propeller with ice class.

I ό 1 '/ A L ό

Zn = H, 0 » 5 Fe = 2, 5 " Ni = 2, 0 » Al a 6 7 « C = ο, 07 " rest Cu.

For example, an alloy composition set of the following type was selected

Ma = 10.0 weight tolerance 10.0 - 11.0

Tolerance 3,5- k, 5 »Tolerance 2,0 - 3,0 ^w Tolerance 1,5 - 2,5" Tolerance 6,5 - 7,0 »Tolerance 0,03- 0,15»

The determined mechanical properties of the abovementioned alloy amount

R 02 s 290 MPa

R a. SkQ MPa

A a "19 36

HB a 150 units

The Al alloy content of Al in the stated composition assumes the coarse and the alloy content of zinc the fine adjustment of the desired and achieved mechanical properties. Good properties with regard to its production and processing remain unchanged and are the same as in BÖ-PS 154 54.beta. · Bas same applies to the service properties, in particular the corrosion, cavitation and erosion resistance.

Claims (2)

Experience san s prü ch β 1 · Manganese-Aluminum-Extra-substance bronze for ship sproep ers, especially for heavy-duty large fixed-pitch and variable-pitch propellers with and without ice class as well as according to the IACS regulations 120 of the Cu category k with a minimum estimate of $ 19 » β © is characterized by the fact that the alloying proportions of said alloy at Zn be set to 2.0-5.5 Ge-w ~ ~ $ and for Al to 6.0-7.0, - $. 2 · Mh-Ai multi-material bronze according to Bst · 1 characterized in that the total alloy of the selected tolerance range of Ma s. 10.0 to 11.0 Zn = s 2.0 big 5.5 * especially 3 »5 to 4.5 Fe a 2.0 to 3.0 Hi a 1.5 to 2.5 Al s 6.0 to 7.0, in particular 6.5 to 7.0 C a. 0.03 to 0.15
Rest of Cu includes ·