Aluminized Steel Pipe

Specifications

Item	Aluminized steel pipe
Material	DX51D / DX53D / DX54D, SPCC/SPCD/SPCE, DC01/DC03/DC04
Origin	Tianjin, China
OD	7.94mm–127mm
WT	0.7mm–3.0mm
Length	300mm~6000mm
Cross-section	Round, Oval, Flattened Oval, Square / Rectangular
Coating	80–240g/㎡, AS80-AS240
Package	Standard seaworthy bundle packing
Standard	ASTM A463
MOQ	10 Tons

Product Types

1. Type 1 Aluminum-Silicon Alloy Coating: A coating consisting of 90% Al and 10% Si, this is the most widely used type. It offers high-temperature resistance and oxidation resistance comparable to stainless steel at approximately one-third the cost.
2. Type 2 Pure Aluminum Coating: Provides general corrosion protection under normal temperature conditions; its high-temperature resistance is inferior to that of Type 1.

Chemical and mechanical properties

	C max	Si max	Mn max	P max	S max
SA1C	0.06	0.02	0.4	0.04	0.04
SA1D	0.06	0.02	0.4	0.04	0.04
SA1E	0.06	0.02	0.4	0.04	0.04

T.S (N/mm²)	E.L (%)	Hardness
275	35	55
275	32	50
275	36	48

Advantages

• High-Temperature Resistance and Oxidation Resistance: These are its key advantages, offering excellent resistance to high-temperature oxidation and withstanding temperatures ranging from 450°C to 927°C.
• Excellent Heat Reflectivity: Aluminum has outstanding heat-reflecting properties; its low heat absorption reduces heat dissipation. It offers outstanding cost-effectiveness in high-temperature operating conditions.
• Good Machinability: We provide machining services for this type of tube, including cutting, flaring, and punching. The coating is resistant to peeling.
• Corrosion Protection: It reacts with air to form a dense layer of aluminum oxide, which passivates the steel tube substrate and provides comprehensive protection against oxidation.

Application Areas

• Automotive Exhaust Systems: Exhaust pipes, mufflers, and heat shields.
• Household Appliances: Tubing for heating equipment such as microwave ovens, air fryers, water heaters, and ovens.
• Industrial Thermal Equipment: Combustion furnaces, heat exchangers, dryers, and furnace components.

• Building Drainage: Drainage pipes for roofs, walls, and prefabricated food trucks.
• Thermal Insulation: Insulation layers for coastal areas or lightweight applications.
• Air Conditioning and Refrigeration: Refrigerant transport. Cooling tower piping components.

Common Standards and Specifications

Project	Type 1	Type 2
Standard	ASTM A463 Type 1	ASTM A463 Type 2 / A929
Coating Composition	91% Al + 5-11% Si	≥99%
Coating Weight	AS80-AS240 (80-240 g/m²)	305 g/m²
Common Substrates	DX51D-DX57D, SA1C/SA1D	—

Classification of Cold-Rolled Base Materials

• General Forming Grade: DX51D, SPCC, DC01; suitable for straight tubes.
• Standard Deep Drawing Grade: DX53D, SPCD, DC03; mainstream grades.
• Ultra-Deep Drawing Grade: DX54D, SPCE, DC04; for processing complex parts.

Production and Processing Procedures

Cold-rolled steel strip slitting → Coiled steel strip formed into open-ended steel tubes → High-frequency welding to form closed-ended steel tubes → Cutting to length → Grinding and deburring of tube ends → Pretreatment (degreasing and acid pickling) → Hot-dip aluminum coating by immersion in high-temperature aluminum-silicon melt → Cooling and straightening → Final inspection of finished products

Coating Structure

• Outer Layer: Al-Si eutectic layer (aluminum-silicon alloy layer).
• Intermediate Transition Layer: Al-Fe-Si alloy layer (iron-aluminum-silicon intermetallic compound layer).
• Substrate: Low-carbon steel tube (cold-rolled steel base).

Why can’t we hot-dip Aluminum before welding?

• If aluminum plating is applied before welding, the high temperatures of the weld will erode and damage the aluminum coating on both sides, making it highly susceptible to rust;
• The slag and oxide layer produced during welding will contaminate the aluminum coating, which cannot be repaired, rendering the finished product unfit for use;
• The globally standardized process involves hot-dip galvanizing the entire pipe after it has been formed.

OD	Inch	NPS	DN	EN/ISO	JIS
Φ42.4	1.66″	NPS 1¼	DN32	42.4mm	42.4mm
Φ48.3	1.90″	NPS 1½	DN40	48.3mm	48.3mm
Φ50.8	2.00″	2-inch solid pipe	DN50	50.8mm	50.8mm
Φ60.3	2.375″	NPS 2	DN50	60.3mm	60.3mm
Φ63.5	2.50″	2.5-inch solid pipe	DN65	63.5mm	63.5mm
Φ76.1	3.00″	NPS 3	DN65	76.1mm	76.1mm
Φ88.9	3.50″	NPS 3½	DN80	88.9mm	88.9mm
Φ101.6	4.00″	4-inch solid pipe	DN100	101.6mm	101.6mm
Φ114.3	4.50″	NPS 4	DN100	114.3mm	114.3mm

Why Choose Our Factory

• Direct Manufacturer: We operate a complete welding production line specializing in the manufacture of ERW and SSAW welded pipes. Our annual production capacity is 100,000 metric tons.
• Quality Assurance: We hold international certifications, manufacture in strict accordance with various standards, conduct full-process online inspections, and support third-party inspections.
• Timely Delivery: We quickly schedule production for in-stock items and deliver custom orders within 10–16 days. With no middlemen marking up prices, our pricing is fair.
• Flexible Customization: We tailor solutions to your specific project needs. We provide standard export packaging and offer free samples.

Glory Steel factory, located in Tianjin, China, is an ISO 9001, ISO 14001, and CE-certified factory with an annual output of 100,000 tons. We specialize in producing hot-dip aluminized and hot-dip galvanized pipes, covering all sizes and providing full machining services. With our high-quality products and services, we export to over 120 countries.