ASTM SA179 Seamless cold-drawn low-carbon steel heat exchanger and condenser tubes

ASTM A179 is a standard established by the American Society for Testing and Materials (ASTM), with the full title "Standard Specification for Seamless Cold-Drawn Low-Carbon Steel Heat-Exchanger and Condenser Tubes." Below is an overview of its key specifications:

1. Scope of Application:

Applies to seamless cold-drawn low-carbon steel tubes with minimum wall thicknesses, intended for heat exchangers, condensers, and similar heat transfer equipment.

Covers outer diameter (OD) sizes from 1/8 inch to 3 inches (3.2 to 76.2 mm), though tubes with smaller OD or wall thickness may also be applicable. However, mechanical performance requirements may not apply to tubes with an OD < 1/8 inch (3.2 mm) or wall thickness < 0.015 inch (0.4 mm).

2. Chemical Composition:

The steel must meet specific chemical composition requirements:

Carbon content: 0.06%–0.18%

Manganese content: 0.27%–0.63%

Maximum phosphorus content: 0.035%

Maximum sulfur content: 0.035%

Alloy steels are exempt from these limits due to additional requirements for special elements.

3. Manufacturing Process:

Tubes must be seamless and cold-drawn.

After the final cold-drawing process, they must undergo heat treatment at 1200°F (650°C) or higher.

4. Surface Condition:

Finished tubes shall be free from scaling, with minor oxide residues not considered scaling.

5. Mechanical Properties & Testing Requirements:

‌Hardness:‌ The Rockwell B hardness shall not exceed 72 HRB.

‌Mechanical testing‌ includes flattening, flaring, flanging (as an alternative to flaring under specific conditions), hardness testing, and hydrostatic testing.

For flattening tests, 2 specimens are taken from each batch (1 per tube).

Hydrostatic testing is required for every tube unless replaced by nondestructive electrical testing per buyer request.

6. Product Marking:

In addition to general marking requirements, tubes must include the buyer's company name and order number.

Specification

Dimension:
OD3.2-76.2mm(1/8in-3in)
Standard:
ASTM A179, SA179
Technique:
Seamless and cold-drawn
Surface treatment:
Varnish or black paint
Application:
Heat-exchanger and Condenser Tubes
Type of Package:
Bundled and Packed in Seaworthy Bags, Plain Ends
Inspection :
EN 10204/3.1 or EN 10204/3.2 Mill Test Certificate, SGS, BV

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