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ASTM A787 Aluminized Steel Tube with Aluminum-Silicon Coating for Automotive

China ASTM A787 Aluminized Steel Tube with Aluminum-Silicon Coating for Automotive

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ASTM A787 Aluminized Steel Tube with Aluminum-Silicon Coating for Automotive

MOQ： 1Ton
Price： 800-1000 USD/Tons
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Supply Ability	60000 Ton/Tons per Year
Product	Aluminized ERW Precision Steel Tube
Wall Thickness	0.70–4.60 mm
Delivery Time	20-40days
Outside Diameter	12.7–380.0 mm
Packaging Details	In bundles or in wooden boxes.
Payment Terms	L/C,D/A,D/P,T/T
Main Standard	ASTM A787/A787M
Shape	Round, Square, Rectangular or Special Shape
ASTM Type	Type 1 – AWAC
Common Grades	MT1010, MT1015, MTX1015, MT1020, MTX1020, 1008, 1010, 1015, 1016, 1017, 1018, 1019, 1021
Length	1–12 m, customizable
Model Number	ASTM A787
Certification	ISO9001, ISO14001, TS16949
Place of Origin	ZheJiang,CHINA
Brand Name	TORICH

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Product Details
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Product Specification


Supply Ability	60000 Ton/Tons per Year	Product	Aluminized ERW Precision Steel Tube
Wall Thickness	0.70–4.60 mm	Delivery Time	20-40days
Outside Diameter	12.7–380.0 mm	Packaging Details	In bundles or in wooden boxes.
Payment Terms	L/C,D/A,D/P,T/T	Main Standard	ASTM A787/A787M
Shape	Round, Square, Rectangular or Special Shape	ASTM Type	Type 1 – AWAC
Common Grades	MT1010, MT1015, MTX1015, MT1020, MTX1020, 1008, 1010, 1015, 1016, 1017, 1018, 1019, 1021	Length	1–12 m, customizable
Model Number	ASTM A787	Certification	ISO9001, ISO14001, TS16949
Place of Origin	ZheJiang,CHINA	Brand Name	TORICH
High Light	ASTM A787 Aluminized Steel Tube ，Automotive Application Precision Steel Tube ，Aluminum-Silicon Coating ERW Steel Tube

ASTM A787 Aluminized Steel Tube Precision Steel Tubes for Automotive

ASTM A787 aluminized steel tube is an electric-resistance-welded carbon steel mechanical tube manufactured from metallic-coated steel strip. For automotive applications, ASTM A787 Type 1, designated AWAC, is the relevant aluminized construction. The tube combines the dimensional control and formability of low-carbon ERW mechanical tubing with an aluminum-based protective coating on the inside and outside surfaces.

The aluminized strip used for Type 1 tubing is manufactured in accordance with ASTM A463/A463M. Aluminum-silicon coated material is particularly suitable for automotive components exposed simultaneously to exhaust heat, condensate, road moisture and atmospheric corrosion.

ASTM A787 is primarily a dimensional, chemical, manufacturing and coating specification. Mechanical-property limits are not assigned to individual A787 carbon-steel grades; where tensile, yield or elongation requirements are critical, they should be specified separately in the purchase order.

Specifications

Item	Specification
Product	Aluminized ERW Precision Steel Tube
Main Standard	ASTM A787/A787M
ASTM Type	Type 1 - AWAC
Material	Carbon Steel
Manufacturing Process	Electric Resistance Welding
Base Material	Hot-rolled or cold-rolled precoated carbon steel strip
Common Grades	MT1010, MT1015, MTX1015, MT1020, MTX1020, 1008, 1010, 1015, 1016, 1017, 1018, 1019, 1021
Coating	Aluminum-coated steel sheet according to ASTM A463/A463M
Shape	Round, Square, Rectangular or Special Shape
Outside Diameter	12.7-380.0 mm
Wall Thickness	0.70-4.60 mm
Length	1-12 m, customizable

Main Characteristics

ASTM A787 Type 1 Aluminized Construction

Type 1 AWAC tubing is manufactured by ERW forming of precoated aluminum-coated carbon steel strip rather than by applying a coating only after the tube has been formed. This provides metallic coating on both the outside and inside surfaces of the tube.

For automotive exhaust-service tubing, aluminum-silicon coated sheet is commonly selected because the Al-Si layer provides oxidation resistance at elevated temperatures while reducing direct exposure of the carbon-steel substrate to exhaust condensate and road contaminants.

Controlled ERW Weld Geometry

ASTM A787 requires the outside weld flash to be removed. The internal weld condition can be ordered according to manufacturing requirements.

Available conditions include:

Flash-In: Internal flash shall not exceed the wall thickness or 2.38 mm, whichever is less.
Flash Controlled: Maximum remaining internal flash of 0.25 mm.
Precision Flash Controlled: Maximum remaining internal flash of 0.13 mm for applicable sizes.

This is important for automotive tube bending, expanding, end forming and insertion into muffler or resonator assemblies.

Defined Dimensional Range

ASTM A787/A787M covers tubing with:

Outside diameter or maximum outside dimension: 12.7-380.0 mm
Wall thickness: 0.70-4.60 mm

The standard also establishes size-dependent OD, wall-thickness, length, straightness and cut tolerances rather than applying one generic tolerance to all tube sizes.

Aluminum-Silicon Surface Protection

When ASTM A463/A463M Type 1 aluminum-silicon coated strip is specified for the starting material, the coating contains an aluminum-rich layer with silicon added to control the steel/coating intermetallic layer.

This coating system is widely selected for components exposed to repeated heating and cooling cycles, particularly automotive exhaust tubing.

Our Advantages

1. Weld-Seam Corrosion Protection Can Be Controlled at the Ordering Stage

A frequent procurement concern with tubing made from precoated strip is the weld seam. ERW welding locally disturbs the original metallic coating at the weld and heat-affected zone.

For this reason, ASTM A787 allows recoating of the outside-diameter weld and heat-affected area to be specified. For automotive exhaust orders, the purchase specification can therefore define OD weld-seam recoating requirements, coating system, maximum allowable uncoated weld width, and surface inspection method.

2. Internal Weld Flash Can Be Matched to the Automotive Forming Process

Automotive tubes are frequently expanded, reduced, bent, swaged or assembled over another tube. Excessive internal flash can interfere with mandrels, insertion depth and end-forming tools.

ASTM A787 provides defined flash conditions rather than treating the ID weld bead as an uncontrolled feature. For demanding forming operations, flash can be controlled to a maximum of 0.25 mm or, for applicable sizes, 0.13 mm.

3. Coating and Tube Dimensions Are Specified as One Finished System

ASTM A787 specifies that the ordered wall thickness includes both the steel substrate and the metallic coating. This point is important when automotive engineers calculate tube mass, bending clearance, slip-fit dimensions, end expansion, assembly tolerances, and tooling dimensions.

Execution Standards

Standard	Scope
ASTM A787/A787M	ERW metallic-coated carbon steel mechanical tubing; primary standard for this product
ASTM A463/A463M	Aluminum-coated steel sheet used as starting material for ASTM A787 Type 1 tubing
EN 10305-3	Welded cold-sized precision steel tubes; useful for European precision dimensional requirements
JIS G3445	Carbon steel tubes for machine structural purposes, including automotive and machinery applications

Application

Automotive Exhaust Muffler Inlet Tube

One specific application is the inlet tube used in an automotive exhaust muffler assembly. The tube carries hot exhaust gas from the upstream exhaust section into the muffler body and is exposed to repeated thermal cycling, internal acidic condensate and external road moisture.

ASTM A787 Type 1 aluminized tubing is suitable for this component because the carbon-steel substrate provides the required tube-forming capability while the aluminum-based coating protects the tube surfaces against oxidation and corrosion.

For muffler inlet-tube production, the most important procurement parameters are normally: outside diameter, wall thickness, tube ovality, internal flash height, aluminized coating designation, weld-seam recoating, cut length, end-expansion dimensions, bending radius, and surface defects at the bend area.

Chemical Composition

ASTM A787 Grade	Carbon C (%)	Manganese Mn (%)	Phosphorus P (%) Max.	Sulfur S (%) Max.
MT1010	0.05-0.15	0.30-0.60	0.035	0.035
MT1015	0.10-0.20	0.30-0.60	0.035	0.035
MTX1015	0.10-0.20	0.60-0.90	0.035	0.035
MT1020	0.15-0.25	0.30-0.60	0.035	0.035
MTX1020	0.15-0.25	0.70-1.00	0.035	0.035

Mechanical Properties

ASTM A787 Grade	Tensile Strength	Yield Strength	Elongation	Hardness
MT1010	Not individually specified by ASTM A787	Not individually specified by ASTM A787	Not individually specified by ASTM A787	Not individually specified by ASTM A787
MT1015	Not individually specified by ASTM A787	Not individually specified by ASTM A787	Not individually specified by ASTM A787	Not individually specified by ASTM A787
MTX1015	Not individually specified by ASTM A787	Not individually specified by ASTM A787	Not individually specified by ASTM A787	Not individually specified by ASTM A787
MT1020	Not individually specified by ASTM A787	Not individually specified by ASTM A787	Not individually specified by ASTM A787	Not individually specified by ASTM A787
MTX1020	Not individually specified by ASTM A787	Not individually specified by ASTM A787	Not individually specified by ASTM A787	Not individually specified by ASTM A787

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Frequently Asked Questions

Are you trading company or manufacturer?

Manufacturer, also can do trading.

How long is your delivery time?

Generally speaking, it is 10-15 days if the goods are in stock, or it is 30-40 days if the goods are not in stock, according to quantity.

Do you provide samples? Is it free or extra?

Yes, we could offer the sample for free charge but need pay the cost of freight.

What is your terms of payment?

Payment <= 2000 USD, 100% in advance. Payment >= 2000 USD, 30% T/T in advance, balance before shipment. If you have another question, please feel free to contact with me.

Company Details

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Business Type:

Manufacturer,Distributor/Wholesaler,Importer,Exporter,Trading Company,Seller 
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Year Established:

1997 
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Total Annual:

25000000-30000000
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Employee Number:

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Company Overview A Professional Steel Tube Manufacturer and Solution Provider TORICH INTERNATIONAL LIMITED integrates steel tube manufacturing, international trade, warehousing, technical support and customized processing. Our manufacturing operations cover cold drawing, cold rolling, heat treat... Company Overview A Professional Steel Tube Manufacturer and Solution Provider TORICH INTERNATIONAL LIMITED integrates steel tube manufacturing, international trade, warehousing, technical support and customized processing. Our manufacturing operations cover cold drawing, cold rolling, heat treat...

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TORICH INTERNATIONAL LIMITED
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https://www.precision-steeltube.com/

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