1. Casting Process Requirements

 1. Ingredients 

1.1. NEW MATERIALS: raw material use standard and minimum grade requirement (see table)

1.2. USED MATERIALS: refers to all grades of Alloy Chemical Composition qualified scrap, including processing scrap casting head, milling crumbs, analysis samples, cleaning materials and Strip workshop production of surface waste.

 1.3. CUPRONICKEL AUXILIARY MATERIALS: A DEOXIDIZER: Electrolytic Manganese, metal magnesium or copper-magnesium Alloy; B covering agent: Calcined Charcoal; C slag refining agent. 

1.4. All raw materials used in production should be clean, no oil, water, explosives, toxic organic and other metal or non-metal inclusions, all kinds of qualified intermediate alloy should have a clear mark, and special box storage, to ensure no mixing phenomenon, the purchased intermediate alloy must have the ingredient certificate, the purchased raw material unifies according to the company raw material management system execution. 

1.5. All raw materials must be proportioned according to the instruction sheet issued by the Process Development Department. All raw materials must be accurately weighed according to the instruction sheet, deoxidizer and so on by the melting and casting workers according to the list of ingredients weighed into. Magnesium or manganese is substituted in the form of metal or electrolyte. WHITE COPPER RAW MATERIAL PROPORTIONING: A purchased scrap 60% + new metal 40% ; b factory return 100% . 

2. Smelting process 

2.1. Chemical composition of zinc cupronickel

2.2. FEEDING SEQUENCE: CUPRONICKEL: Electrolytic nickel + ELECTROLYTIC COPPER + recycling (corner material) of our factory + charcoal melting + adding zinc —— melting —— -- heating —— stirring, slag cleaning refining + slag fishing + charcoal —— Sampling analysis —— Temperature rising spray + manganese (the addition of manganese was determined according to the results of chemical analysis) + CU-MG alloy melting

2.3. After melting and stirring, the sample is collected in the melting furnace. After adjusting the composition, the sample must be analyzed again. After the converter in the holding furnace sampling, each roll, the head and tail of a sample, sampling tool with graphite crucible. 2.4. Tapping temperature and actual converter temperature: 1 times firing of Cupronickel, the level of melting furnace is controlled below the bottom edge of the tapping port. Slag fishing: Before slag fishing, add refining slag cleaning agent, smelting furnace 1 times per furnace, holding furnace 2 times per shift. 2.5 degassing of white copper wire with Deoxidizer is carried out in two steps. 30-50 G of manganese is first added before the converter, and 20-40 G of magnesium is added after, a special tool is used to thoroughly deoxidize the deoxidizer into the copper water, and a deoxidizer is added to the holding furnace according to the actual situation.

2.3. After melting and stirring, the sample is collected in the melting furnace. After adjusting the composition, the sample must be analyzed again. After the converter in the holding furnace sampling, each roll, the head and tail of a sample, sampling tool with graphite crucible. 2.4. Tapping temperature and actual converter temperature: 1 times firing of Cupronickel, the level of melting furnace is controlled below the bottom edge of the tapping port. Slag fishing: Before slag fishing, add refining slag cleaning agent, smelting furnace 1 times per furnace, holding furnace 2 times per shift. 2.5 degassing of white copper wire with Deoxidizer is carried out in two steps. 30-50 G of manganese is first added before the converter, and 20-40 G of magnesium is added after, a special tool is used to thoroughly deoxidize the deoxidizer into the copper water, and a deoxidizer is added to the holding furnace according to the actual situation.

Source: Copper Alloy Casting