Product introduction

3A21 aluminum tube is made of 3A21 rust-proof aluminum alloy (old grade LF21), which belongs to the aluminum-manganese alloy system and contains 1.0%-1.6% manganese. It has the corrosion resistance of pure aluminum and higher strength, especially resistant to atmospheric, weak acid and alkali corrosion, and is easy to weld (suitable for argon arc welding) and cold processing. The material has good plasticity and can be cold-bent and expanded, but cannot be heat-treated and strengthened. It is widely used in chemical pipelines, refrigeration pipelines, ship ventilation and food machinery transportation and other fields with high corrosion protection requirements. The common state is soft (O) or semi-hard (H14), with an outer diameter range of 6-200mm.

Product Parameter

Alloy	3A21
Temper	O,H12,H14,H16,H18,H19,H22,H26,H28,H32,H36,H34,H38
Thickness(mm)	0.2-8.0
Width(mm)	100-2650
Length(mm)	C
Standard	JIS,AISI,ASTM,GB,DIN,EN
Surface	Coating, embossing, brushing, polishing, anodizing, etc.
OEM	Punching, cutting to special size
Sample	Free
Package	Strapping, plastic bag, film, wooden pallet standard seaworthy export packaging
Application	Construction, shipbuilding, decoration, industry, manufacturing, machinery, hardware and other fields

Precision size specifications

3A21 aluminum tube provides standard specifications of outer diameter 6-300mm, wall thickness 0.5-15mm, and length can be customized to 12 meters. Made of 3A21 aluminum-manganese alloy (Mn content 1.0-1.6%), strictly implement GB/T 4437.1-2015 standard, outer diameter tolerance ±0.1mm, wall thickness tolerance ±10%. Supports multiple states such as O, H12, H14, special specifications can be customized, and the maximum single length can reach 15 meters (customization requires appointment).

Authoritative certification and patented technology

We hold ISO 9001:2015 quality management system certification, SGS material testing certification and CE certification. We have 5 utility model patents, including a high-precision aluminum tube cold drawing process and corrosion-resistant aluminum tube surface treatment technology. All products comply with RoHS and REACH environmental protection directives, and third-party test reports can be provided.

Professional packaging and global transportation

Three-layer protective packaging: inner layer of anti-rust oil paper, middle layer of bubble film, outer layer of waterproof woven cloth. PVC sheath is added to the pipe end, and the weight of each bundle does not exceed 1 ton, fixed with wooden box or steel frame. Special container bracket is used for sea transportation, equipped with humidity indicator card. Supports various trade terms such as EXW, FOB, CIF, etc., and can be delivered to major ports around the world within 15 days, with an annual transportation volume of more than 5,000 tons.

Advanced processing technology

Supports a variety of professional processing methods:

- Cold rolling process (surface roughness Ra≤0.6μm)

- Online annealing treatment (temperature control ±5℃)

- Precision polishing of inner holes (can achieve mirror effect)

- Special surface treatment (hard anodizing, micro-arc oxidation, etc.)

Equipped with German imported straightening machine, the straightness can reach 0.3mm/m, meeting the aerospace grade precision requirements.

High-end application areas

Widely used in:

- Shipbuilding (seawater corrosion resistant parts)

- Chemical equipment (heat exchanger pipes)

- Rail transit (lightweight structural parts)

- Power engineering (conductive busbar tube)

Its excellent corrosion resistance (40% higher than ordinary aluminum tubes) is particularly suitable for use in marine environments, and is particularly outstanding in LNG storage and transportation systems.

Global market layout

The products are exported to 32 countries and regions, and the key markets include:

- Europe (Germany and the Netherlands account for 35%)

- Southeast Asia (Vietnam and Thailand account for 28%)

- Middle East (UAE and Saudi Arabia account for 20%)

In the past three years, the average annual export growth rate is 23%. We are familiar with international standards such as ASTM B241 and EN754, and can provide customers with technical support in multiple languages such as Russian and Spanish.