Topic : Selection of material from reference tables for professional activity Equipment supply : projector Purpose of work

Copper and its alloys . Brass is an alloy of copper, the main alloying element of which is zinc. According to the amount of alloying elements, brasses are divided into the following types.
- simple brasses;
- multi-component (alloyed) brasses
Common brasses are marked with the letter "L" and numbers, the numbers indicating the average amount of copper in the alloy.
For example: alloy L90 - brass contains 90% copper, the rest consists of zinc. The letters and numbers on the brand of alloyed brass indicate the alloying elements in the alloy and their percentages. For example, the alloy LANKMts75-2-2.5-0.5-0.5 is aluminum-nickel-silicon-manganese brass, which contains 75% copper, 2% aluminum, 0.5% nickel, 0.5% silicon. .5% manganese and the rest zinc.
Depending on the alloying element, there are brasses with aluminum, silicon, manganese, nickel, tin, and lead.
Bronze is an alloy of copper with tin and other elements ( aluminum, silicon, manganese , lead beryllium). According to the amount of the main components, bronze is divided into the following types: tin - the main alloying component is tin; tin (special), does not contain tin.
Bronze is marked with the letters "Br" and the index and composition of the elements included in the composition. Then the numbers determine the average percentage of the elements in the composition (the number indicating the amount of copper in bronze is not put).
For example, an alloy labeled BrOTsS5-5-5 indicates that the composition consists of 5% tin-lead and zinc, and the remaining 85% copper.
Deformable tin bronzes contain up to 8% tin. These bronzes are used to make deformable parts such as springs and membranes.
Cast bronzes contain more than 6% tin and have high anti-friction properties and durability. These alloys are used to make details in friction pairs (sliding bearings).
Special bronzes include aluminum, nickel, silicon, iron, beryllium, chromium, lead and other elements. In most cases, the name of bronze is determined by the name of the main alloying element. The chemical elements used in alloying are defined as follows in the marking of copper alloys.

Table specifying the alloying elements.

Index	Chemical element name
A	Aluminum
Zl	Gold
O	Tin
Wm	Tungsten
K	Cobalt
Cr	Silicon
S	Lead
Sn	Selenium
Sr	Silver
Su	Do not slide
M	Copper
N	Nickel
Ti	Titan
V	Vanadium
J	Iron
Ts	Zinc
Mts	Manganese
F	Phosphorus

Table No. 1

Alloy brand	Alloy classification	Field of application

No. 1
1 LA77-2, D162 AL253 BrSuZNZTsZS204 D185 AK7

OPTION No. 21 LTs40MtsZA2 AK4M43 Br06Ts6S34 Amg65 AL2

OPTION No. 31 LJMts59-1-1,2 AL93 Br0Fb, 5-0, 15;4 D18,5 Amts5

OPTION No. 41 LK80-3,2 AK4M43 BrKMtsZ-14 D125 Amg2

OPTION No. 51 AMg5P2 LANKMts75-2-2,5-0,5-0,53 BrOTsS5-5-54 D185 L67

No. 6
1 L902 AK43 AMg5V4 LJMts59-1-15 BrOF10-1

Control questions:
1. Kak klassifitsiruyutsya brass?
2. Kak klassifitsiruyutsya bronzy?
3. Kak klassifitsiruyutsya alyuminievye splavy?