In the past few decades, tens of thousands of tons of brass have been put into people's production and life, especially in Marine engineering, ship manufacturing, brass has played an extremely important role. During the development of brass, the effect of different alloying elements on the microstructure of brass was studied by adding a small amount of alloying elements to the simple brass. The effect of heat treatment on microstructure of brass was studied by changing the temperature and cooling rate of heat treatment. The mechanism of dezincification corrosion, pitting corrosion, galvanic corrosion and other common corrosion of brass were studied by electrochemical equipment. The composition and structure of the film were studied by XRD, EDS, XPS, SEM and TEM. The distribution of special grain boundary in brass was studied by grain boundary engineering. This series of research has made brass become an increasingly mature material, widely used in people's production and life. Common grades of brass used in Marine engineering are HSN70-1, HNI65-5, HNI56-3, HA177-2, HMN58-2, ZCuZn40Mn3Fe1, ZCuZn40Mn2, HFE59-1-1 and HFE58-1-1.
Hsn70-1 tin brass has been widely used in shipbuilding industry. Naval brass. The reputation. The brass is the alpha of the Cu, Zn, Sn ternary series, which usually contains trace amounts of arsenic. Single-phase brass, hSN70-1 is classified as arsenic-added brass in the Chinese National standard (GB5232-85) classification. We classify this brass as tin brass according to the number of main added elements (less than Cu and Zn).It is well known that simple brass has medium strength, hardness and moderate corrosion resistance. However, by adding 0.5%-1.5% Sn to simple brass, the strength and hardness of the alloy and its resistance to corrosion in seawater can be improved, as well as the cutting performance of the brass. It should be noted that HSN70-1 has the tendency of stress corrosion cracking, so low temperature annealing of stress relief must be carried out for cold-worked pipes. At the same time, HSN70-1 is easy to crack during hot pressing, so the content of impurities should be strictly controlled.
Hni65-5 and HNI56-3 are common nickel brass. By adding the right amount of Ni to the simple brass, you can enlarge α Phase zone, change duplex brass to single-phase brass, improve corrosion resistance and workability of brass. Nickel brass also has good friction reduction and good mechanical properties, in cold and hot state pressure processing performance is very good, dezincing and ldquo; Season crack & throughout; Relatively stable, low thermal conductivity, often used in the manufacture of Marine industry pressure gauge and condensing pipe. However, due to the high price of nickel, hNI65-5 and HNI56-3 are not widely used.
Ha177-2 is a typical aluminum brass. When corroded by corrosive medium, a dense Al2O3 oxide film is formed on the surface of brass, which is closely bound to the matrix. This film can protect the internal structure from erosion. In addition to good corrosion resistance, HA177-2 aluminum brass also has high strength and hardness, good plasticity, can be in the cold state, hot state pressure processing, but also resistant to impact corrosion, often used in the ship's condensing pipe and other corrosion resistant parts. It should be noted that HA177-2 brass has a tendency to dezincification and corrosion cracking, so this should be taken into account in the selection of materials. In addition to HA177-2, ZCuZn25Al6Fe3Mn3, ZCuZn26Al4Fe3Mn3, ZCuZn31Al2 and other cast aluminum brass have also been widely used in Marine engineering.</div>
Hmn58-2 is a common manganese brass. The addition of Mn element refines the grain and improves the strength, hardness and corrosion resistance of brass in sea water and hot steam. Therefore, HMN58-2 has higher corrosion resistance in sea water, superheated steam and chloride. In addition, HMN58-2 has good mechanical properties and is easy to be processed under pressure in hot state and pressure in cold state. It should be noted that HMN58-2 has corrosion cracking tendency, which should be taken into account when selecting materials and designing parts. Manganese brass often appears in the form of casting in Marine engineering. For example, ZCuZn40Mn3Fe1 can be used to make large castings such as parts resistant to seawater corrosion, pipe fittings working below 300℃, and Marine propellers;ZCuZn40Mn2 can be used to manufacture parts, body and joints for work in air, fresh water, sea water, steam (below 300℃) and various liquid fuels.
Hfe59-1-1 and HFE58-1-1 are two of the most common types of iron brass. The iron is precipitated in brass by the iron-rich particles. Crystal nucleus & throughout; By refining the casting structure of brass and preventing the recrystallization grain from growing, the mechanical and technological properties of brass can be improved. The iron content in iron brass usually does not exceed 1.5%. The iron content is too high and the fe-rich phase increases, which will reduce the corrosion resistance of the alloy due to the segregation of the fe-rich phase. In order to avoid the harm caused by the precipitation of Fe from the solid solution, Fe is often used in combination with Mn to improve the corrosion resistance.
Hfe59-1-1 and HFE58-1-1 have high strength, toughness, good anti-friction, high corrosion resistance in atmosphere and sea water (but with the tendency of corrosion cracking), good plasticity in hot state, and are often used to make structural parts working in friction and under the condition of seawater corrosion.
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