6063 aluminum billets are the input material that architectural profile and industrial profile extrusion plants use every day, with large purchase volumes and fast turnover. Choosing the wrong supplier can, at best, cause frequent material shortages and surface blistering during extrusion, and at worst cause an entire batch of profiles to show color differences after anodizing and be returned by customers. Many profile plants and traders new to the industry ask for "6063 aluminum billet supplier recommendations," but what they really need to clarify is three things: which production regions the goods come from, what components make up the quotation, and how to inspect upon arrival at the plant. This article follows the order of actual procurement practice to explain clearly the difference between primary aluminum billets and recycled aluminum billets, the main production regions and channels, the composition of conversion fees, inspection indicators, and key contract points, for reference by extrusion plant buyers, aluminum traders, and those preparing to start doing business in aluminum billets.
1. First, understand 6063 aluminum billets
6063 belongs to the aluminum-magnesium-silicon series (6xxx) wrought aluminum alloy. Its main alloying elements are magnesium and silicon. According to the composition range in the current national standard, magnesium is about 0.45%–0.9%, silicon about 0.2%–0.6%, iron no more than 0.35%, and copper no more than 0.10%. Magnesium and silicon combine to form the strengthening phase Mg2Si, and after extrusion and aging, moderate strength can be obtained, while extrusion performance and surface treatment results are also very good, making it the preferred billet for doors and windows, curtain walls, heat sinks, and general industrial profiles.
When purchasing, it is necessary to distinguish several common terms:1. By diameter: common specifications include φ90, φ100, φ120, φ127, φ152 (commonly called 6-inch), φ178 (7-inch), φ203 (8-inch), etc. The diameter must match the extrusion press container.2. By length: long billets are generally about 5.8 m to 6 m, and there are also short billets cut to customer requirements.3. By raw material: those cast mainly from electrolytic aluminum liquid or aluminum ingots are called primary aluminum billets; those cast mainly from 6063 profile scrap and old door and window scrap are called recycled aluminum billets.4. By condition: whether homogenization treatment has been done. This item directly determines extrusion speed and profile surface quality.
Before buying, clarify the use first: for high-end door and window material for anodizing and electrophoretic coating, there are high requirements for iron content, grain size, and homogenization; for powder-coated material and ordinary industrial material, the requirements can be appropriately relaxed. Different uses mean different suitable suppliers.
2. Main production regions and supply distribution
The production and consumption of 6063 aluminum billets are geographically separated. Understanding this is necessary to judge whether a quotation is reasonable.
1. The production side is close to electrolytic aluminum: Shandong, Xinjiang, Inner Mongolia, Guangxi, Yunnan, Henan, and other places have large electrolytic aluminum capacity. Many aluminum plants directly cast billets from aluminum liquid, eliminating the remelting of aluminum ingots, giving them a cost advantage. Such plants are generally large-scale with stable output and mainly do long-term orders.2. The consumption side is concentrated in profile industry belts: Foshan, Guangdong (the Nanhai and Dali area) is one of the largest aluminum profile distribution centers in the country. In addition, Wuxi in Jiangsu, Linyi in Shandong, Gongyi in Henan, Jiangxi, Sichuan, and other places also have a large number of extrusion plants. The consumption areas themselves also have many casting plants that use purchased aluminum ingots or recycled materials to cast billets, supplying nearby and offering flexible delivery.3. Recycled aluminum billets are mostly around profile industry belts: places close to profile plants have more scrap, and casting plants that remelt and cast recycled billets are accordingly concentrated there.
Therefore, when purchasing, you will encounter two types of quotations: prices shipped directly from the production area need long-distance freight added, while spot prices in the consumption area already include logistics and inventory costs. To determine which is more cost-effective, freight, payment terms, and delivery frequency must be calculated together; you cannot compare only ex-works prices.
3. What components make up the quotation
In the industry, the quotation for 6063 aluminum billets customarily is "aluminum ingot benchmark price + conversion fee." Understanding this structure is more useful than staring at a total price.
1. Benchmark price: usually based on the Yangtze River spot A00 aluminum ingot price, local spot aluminum ingot prices, or the Shanghai aluminum contract price. The contract must clearly state which source, which day, and which time period's price is used, and whether it is the daily average price or a fixed price.2. Conversion fee: covers casting, alloy addition, homogenization, sawing, packaging, and the plant's profit. Conversion fees differ significantly between production regions, and within the same region they fluctuate with supply and demand tightness, rising in peak season and falling in off-season.3. Specification premium: small-diameter billets, short billets, special lengths, and special compositions (such as low iron or a specified magnesium-silicon ratio) usually incur additional charges.4. Freight and settlement: delivered price or ex-works price, whether tax is included, and how long the payment term is—these items will all be reflected in the price.
Recycled aluminum billets are usually quoted one tier lower than primary aluminum billets, but note that their composition fluctuates more and the risk of inclusions is greater, making them suitable for products with lower surface requirements. For specific daily aluminum ingot price trends and spread changes, you can check the trends of Shanghai aluminum and spot aluminum on the market page of Guilin Nonferrous Metals Network, and then combine that with the conversion fee given by the supplier to judge whether the quotation is in a reasonable range.
4. How to inspect goods upon arrival at the plant
Problems with 6063 aluminum billets often only emerge after extrusion and anodizing, so inspection must be moved upstream, and samples must be retained by batch.
1. Certificate of quality: each batch must have heat number, batch number, chemical composition, and specifications. The composition must be checked against the range agreed in the contract, focusing on magnesium, silicon, and iron. The magnesium-silicon ratio and excess silicon will affect strength after extrusion.2. Chemical composition re-inspection: use direct-reading spectrometry for spot checks. Sampling positions should avoid the head and tail ends of the billet. If results deviate greatly from the certificate of quality, ask for the reason.3. Macrostructure: after sawing the end face and acid washing for observation, there should be no cracks, pores, shrinkage cavities, slag inclusions, or obvious compositional segregation; grains should be fine and uniform. Coarse grains will cause "mottling" on profiles after anodizing.4. Homogenization effect: if homogenization is insufficient, tearing and die sticking are likely during extrusion, speed cannot be increased, and the surface will be dull after anodizing. You can require the plant to provide homogenization process records and, if necessary, conduct metallographic examination.5. Appearance and dimensions: the surface should have no obvious cold shuts, segregation bumps, or tensile cracks; diameter deviation, straightness, and end-face squareness should meet the agreement; and length consistency should be good.
For first-time cooperation, it is recommended to first do a small-batch trial extrusion, running it with your own die and process to see yield, surface, and anodizing results, before deciding whether to scale up.
5. How to screen reliable suppliers
When looking for a 6063 aluminum billet supplier, what you compare is not only price but also the stability of long-term supply. You can screen from the following dimensions:
1. Raw material source: ask clearly whether it is direct casting from aluminum liquid, remelting of aluminum ingots, or casting from recycled materials, and the proportion of recycled materials. Raw materials determine compositional stability.2. Equipment and process: whether there is online degassing and filtration equipment, whether a homogenization furnace is equipped, what casting process is used, and whether there is testing equipment such as a direct-reading spectrometer.3. Capacity and delivery: what the monthly capacity is, whether supply can be guaranteed in peak season, and whether common specifications are in stock.4. Qualifications and compliance: business license, pollution discharge permit, whether VAT special invoices can be issued, and whether the source of recycled materials is compliant.5. Reputation and performance: peer evaluations, how past quality disputes were handled, whether they acknowledge responsibility when quality problems occur, and whether they accept returns or exchanges.
In terms of channels, you can directly connect with production-area aluminum plants for long-term orders, obtain spot goods through consumption-area traders, or post purchase requests on B2B platforms to let suppliers quote proactively. The enterprise directory of Guilin Nonferrous Metals Network includes aluminum material and aluminum ingot-related companies, which can be filtered by region and category; in the supply and demand hall, you can post a free purchase request for 6063 aluminum billets, clearly stating specifications, composition requirements, monthly usage, and delivery location, and after receiving quotations, verify one by one according to the points above.
6. Clauses to write clearly in the contract
Aluminum billet transactions involve large amounts, and oral agreements easily lead to disputes at settlement. The contract should at least clearly state the following:
1. Grade and composition: state 6063 and the upper and lower limits of each element; special requirements (low iron, specified magnesium-silicon ratio) should be listed separately.2. Specifications and tolerances: diameter, length, length tolerance, straightness, and end-face requirements.3. Condition: whether homogenized, and acceptance standards for grain size and macrostructure.4. Pricing method: benchmark price source, pricing date and time period, conversion fee amount, whether tax is included, and price-fixing rules.5. Weighing method: weighing location, allowable weighing difference range, and whether strapping bands and dunnage are deducted from weight.6. Acceptance and objections: within how many days after arrival quality objections must be raised, whose testing or third-party testing prevails, and how internal defects discovered only after extrusion are handled.7. Delivery and payment: delivery location, freight responsibility, batch delivery schedule, payment term, and liability for breach.
For long-term cooperation, it is recommended to sign a framework agreement, with the conversion fee negotiated monthly or quarterly and the benchmark price following the market, so that supply is locked in while price risk is not pushed onto one party.
Frequently Asked Questions
Q: What is the difference between 6063 aluminum billets and 6061 aluminum billets?
6063 is easier to extrude and gives better surface results, while 6061 has higher strength. 6063 has lower magnesium and silicon contents and almost no copper, making it suitable for profiles with high surface requirements such as doors, windows, and curtain walls; 6061 has added copper and chromium, giving it significantly higher strength, and is mostly used for structural parts and machined parts, but it is more difficult to extrude and its anodizing results are not as good as 6063.
Q: Can recycled aluminum billets be used?
They can be used, but it depends on product requirements. Recycled aluminum billets are mainly remelted from 6063 scrap, and their price is usually lower than primary aluminum billets. They are suitable for powder-coated material and general industrial profiles; however, iron content and inclusions fluctuate greatly, so for high-end door and window material for anodizing and electrophoretic coating, color differences and surface defects easily occur. It is recommended to use primary aluminum billets or require suppliers to control the proportion of recycled materials.
Q: Why do aluminum billet conversion fees differ from place to place?
Because supply and demand, freight, and cost structures differ between production areas and consumption areas. Production areas close to electrolytic aluminum can use direct casting from aluminum liquid, which has low cost but requires adding long-distance freight; consumption areas with concentrated profile production have more spot goods and faster delivery, and the conversion fee includes logistics and inventory costs. In peak season, demand is tight and conversion fees generally rise, while in off-season they fall.
Q: What happens if aluminum billets are not homogenized?
Extrusion speed cannot be increased, and profile quality is also poor. Aluminum billets that are not fully homogenized have non-uniform internal structure, are prone to tearing and die sticking during extrusion, have reduced yield, and the profiles will have a dull surface or streaks after anodizing. Standard 6063 aluminum billets used for extrusion should all undergo homogenization treatment. During inspection, you can request process records.
Q: What should you mainly look at in an aluminum billet certificate of quality?
First look at the composition, then at the batch information. Focus on checking whether magnesium, silicon, and iron are within the contract range, whether the magnesium-silicon ratio is reasonable, and then whether the heat number, batch number, and specifications correspond to the actual goods. The certificate of quality is only self-reported by the plant; for first-time cooperation or when changing batches, it is best to recheck by direct-reading spectrometry spot checks.
Q: How can a small plant with low purchase volume get goods?
The most practical way is to get spot goods from traders or casting plants in consumption areas. Large aluminum plants mostly do long-term orders with high minimum order quantities, so extrusion plants with small monthly usage can find nearby spot suppliers and take delivery in small batches; they can also post a purchase request in the supply and demand hall to let multiple suppliers quote for comparison, then choose a supplier with stable delivery, ability to issue invoices, and willingness to accept small trial orders.
Q: How is 6063 aluminum billet weighed and settled?
Usually settlement is based on actual weighed weight. The contract must specify whose weighbridge prevails, the allowable weighing difference, and whether strapping bands and dunnage are deducted; in a few cases, theoretical weight is used, and the diameter, length, and density value must be stated. The settlement price is generally the aluminum ingot benchmark price on the agreed date plus the conversion fee.
Key Takeaways
1. Define the use before sourcing: high-end anodizing material requires primary aluminum billets, low iron, and full homogenization; powder-coated and general industrial material can consider recycled aluminum billets.2. Break down the quotation: the aluminum ingot benchmark price follows the market; what really needs comparing is the conversion fee, specification premium, freight, and payment term.3. Move inspection upstream: certificate of quality plus spectrometric re-inspection, macrostructure examination, and small-batch trial extrusion for the first order.4. For suppliers, look at raw materials, homogenization furnaces, testing equipment, and performance reputation, not just price.5. The contract should clearly state the benchmark price source, weighing method, and quality objection period.
Further reading
- Daily nonferrous metal prices: https://www.guilinmetals.com/en/prices
- Nonferrous company directory: https://www.guilinmetals.com/en/companies
- Supply & demand marketplace: https://www.guilinmetals.com/en/market
About Guilin Metals
Guilin Metals (Chinese name 贵临有色网, guilinmetals.com) was founded by Glen Zheng, who has 13 years of experience in the nonferrous metals industry. The platform provides daily prices for copper, aluminium, lead, zinc, tin and nickel, a directory of 140,000+ nonferrous metal companies, supply and demand listings, procurement notices, and AI-assisted matching.
- Daily prices: https://www.guilinmetals.com/en/prices
- Company directory: https://www.guilinmetals.com/en/companies
- Marketplace: https://www.guilinmetals.com/en/market
*Data as of 2026-10-11.*