Material Procurement

Metal material is a general term of pure metal or alloy in industry. Common pure metal includes gold, silver, copper, iron, aluminum, tin, nickel, lead, zinc, carbon, etc. Combining two or more metal or non-metal is called alloy. Alloys can adjust the properties of pure metals to more industrially demanding characteristics. Common alloy is composed of iron and carbon as ferroalloys, including steel, stainless steel, carbon steel, tool steel and alloy steel, etc. Ferroalloy is also the most broadly used and most important material in engineering technology among metal materials.

Metal materials are vitally important to the economic development of all countries in the world. Metal is a permanent material that can be cycled repeatedly without losing its properties. Metal materials can be recycled, reused and reduced waste, which is the basis for successful circular economy. From transportation, infrastructure, real estate to manufacturing, agriculture and energy industries, high-strength steel products keep expanding and reducing the weight of metal applications, which achieves circular economy.

WKPT not only provides cast iron, stainless steel, carbon steel, but also non-ferrous metal forming technology, such as die-casting and extruding deformed aluminum alloy processing. In addition to above materials, we also accept customers designated materials for processing.

We use cast iron, stainless steel, carbon steel and aluminum alloy as the main processing materials
Total 4

    Cast iron materials refer to iron-carbon alloys with carbon content more than 2.11%. In addition to carbon, there are also elements such as silicon, manganese, and a small amount of sulfur and phosphorus. Cast iron is usually made of pig iron, scrap steel, ferroalloys, etc. in different proportions through smelting. It has good performance in features such as casting, shock absorbing, pressure resistance, wear resistance, cutting processing, etc. Compared with other metal materials, cast iron production equipment and technology are relatively simple and low in price, so it is widely used in machinery manufacturing, petroleum, chemical industry, metallurgy, transportation and military industries, etc. Industrial cast iron generally contains 2.5% to 3.5% carbon. Carbon mostly presents in the form of graphite in cast iron. Based on the form of graphite, it can be roughly divided into white cast iron (steel-making pig iron), gray cast iron, malleable cast iron, ductile iron, etc.

    Aluminum alloy is the general term for aluminum-based alloys. The main alloy elements are copper, silicon, magnesium, zinc, and manganese, and the secondary alloy elements are nickel, iron, titanium, and chromium. The content of aluminum on the earth is only next to oxygen and silicon, and its density is only one-third of iron. It is the fourth most conductive metal after gold, silver, and copper. Aluminum alloy has low density but relatively high strength, which is close to or excessive to high-quality steel. It has good plasticity and can be processed into various profiles, with excellent electrical conductivity and thermal conductivity. It is widely used in industry and its usage is only second to steel.

    Stainless steel, also known as galvanized iron, is the common name for corrosion-resistant steel. More specifically, steel with chromium (Cr) content greater than 12% in molten steel is called stainless steel. Stainless steel is usually made of iron as the basic material and added 12% to 30% chromium and other alloying elements into a high alloy steel. Its chemical composition is based on iron, carbon, chromium, and other alloying elements such as nickel, molybdenum, copper, titanium, niobium, etc. Chromium is the most important alloying element of stainless steel, which can strengthen the corrosion resistance, especially the lower the carbon content, the better the corrosion resistance. Stainless steel can work safely for a long time at a temperature of -196°C to 800°C, without releasing harmful substances, and keep the material performance stable. Therefore, the stainless steel material is safe and non-toxic, free from corrosion and exudation, and meets the requirements of safety and hygiene.

    Carbon steel is an iron alloy with carbon elements, that is, iron-carbon alloy. Carbon steel refers to carbon content higher than 0.02% and lower than 2% (above 2% is called cast iron, and less than 0.02% is called wrought iron). It is the material with the highest production and few other elements mixed. Carbon steel has the characteristic of close-connected carbon bonds, and it is stronger than iron, harder than stainless steel, and cheaper. Carbon steel is divided into high carbon steel, medium carbon steel, and low carbon steel. It is usually used on metal parts that require strength, hardness, and wear resistance. The more content of carbon in steel, the higher its hardness, strength, and wear resistance after heat treatment.

Other Material
  • Free-cutting steel:By adding sulfur, tellurium, or 0.15~0.35% of lead to ordinary carbon steel, to have better machinability.
  • Bearing steel:It’s a high-carbon high-chromium alloy steel with good overall performance. It has evenly high hardness after quenching and tempering, high wear resistance and contact fatigue strength.
  • Carbon structural steel:Carbon structural steel refers to carbon steel with carbon content less than 0.38% and sulfur and phosphorus content more than 0.035%. It is usually rolled into rebar, steel bars, steel plates, steel pipes, etc.
  • Nickel-chromium-molybdenum structural steel:Add less than 1.0% molybdenum into nickel-chromium steel will get a tough steel. It is the best case hardening steel among structural steels.
Machining Features among cast iron, carbon steel and stainless steel
Material Stainless Steel Carbon Steel Cast Iron
Main Element Iron
Carbon Content 0.85~1.0 % 0.0218%~2.11% 2.11%~6.67%
  • 200 series:
    Industrial grade stainless steel
  • 300 series:
    Food grade stainless steel
  • 400 series:
    Food grade stainless steel
Low carbon steel
Medium carbon steel
High carbon steel
Grey cast iron
White cast iron
Malleable cast iron
Ductile iron
Vermicular cast iron
Material Configuration It is a material with a certain shape, size and performance made by pressure machining of steel ingots, billets or steel. It is a material with a certain shape, size and performance made by pressure machining of steel ingots, billets or steel. It is usually made of pig iron, scrap steel, ferroalloys, etc. in different proportions through smelting. After that, it will be directly poured into castings.
Machining Features Nice mechanical property and easy to machining. Keep property in good condition even in high and low temperature environment. The higher the carbon in carbon steel, the greater the hardness, and also the higher strength but lower plasticity.
  • White cast iron:
    High hardness, poor toughness
  • Ductile cast iron:
    High hardness and toughness
Industries Application Metal parts require corrosion resistance, easy cutting, weldability, abrasion resistance and fatigue resistance. Metal parts require strength, hardness, and wear resistance. Metal parts require low cost, good machining, shock absorbing and wear resistance. High hardness, tensile resistance, ductility and deformation resistance.

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