ASTM A179 Seamless Tube

Description

Product Description ASTM A179 Seamless Tube

ASTM A179 seamless tube are designed for heat exchangers and condensers in various industries, providing efficient heat transfer and thermal conductivity. These tubes are manufactured to ASTM A179 standards, ensuring high-quality performance in low-temperature applications. Known for their excellent corrosion resistance and durability, ASTM A179 seamless tubes are crucial components in applications where precise temperature control and efficiency are paramount.

ASTM A179 Dimensions

OD (mm)	WT (mm)	OD (mm)	WT (mm)	OD (mm)	WT (mm)
6.35	0.91	19.05	3.404	31.75	2.769
9.53	1.22	20	2	31.75	3.7
12.7	1.22	20	2.2	32 X 22	3.404
12.7	1.245	25	2	36 X 14	1.8
12.7	1.65	25	2.77	38	2.77
15.875	1.245	25.4	1.6	38	3.2
15.875	1.65	25.4	1.651	38.1	2.41
15.875	1.651	25.4	2	38.1	2.769
15.875	2.108	25.4	2.108	38.1	2.9
15.875	2.413	25.4	2.11	38.1	3.05
15.88	1.65	25.4	2.41	38.1	3.403
16	1.2	25.4	2.7	40	1.5
16	2	25.4	2.76	44.45	2.1
19.05	1.22	25.4	2.769	50.8	2.413
19.05	1.651	25.4	2.77	50.8	3.05
19.05	2	25.4	3.048	50.8	3.404
19.05	2.1	25.4	3.15	57.15	3.048
19.05	2.108	25.4	3.4	60.3	2
19.05	2.11	31.75	2.108	63.5	3.76
19.05	2.64	31.75	2.11	63.5	8
19.05	2.769	–	–	–	–

Material:

ASTM A179 is a specification for seamless cold-drawn carbon steel tubing that is intended for use in heat exchangers, condensers, and similar applications. The material is typically made from carbon steel with a chemical composition that includes elements like carbon, manganese, phosphorus, and sulfur. This specification is primarily focused on tubes made from low-carbon steel.

Chemical Composition ASTM A179 Seamless Tube

Element	Composition (%)
Carbon (C)	0.06-0.18
Manganese (Mn)	0.27-0.63
Phosphorus (P)	0.035 max
Sulfur (S)	0.035 max

Mechanical Properties ASTM A179 Seamless Tube

Property	Value
Tensile Strength	325 MPa (47,000 psi) min
Yield Strength	180 MPa (26,000 psi) min
Elongation	35% min
Hardness	HRB 72 max

Heat Treatment:

The heat treatment process for ASTM A179 tubes typically involves normalizing or stress relieving to achieve the desired mechanical properties. The tubing is cold-drawn during manufacturing, which strengthens the material and improves its surface finish. Specific heat treatments may include:

• Normalizing: Heating the steel to a temperature above the critical range (usually around 900–950°C) and allowing it to cool in air.
• Annealing: Heating the material to a high temperature and then allowing it to cool slowly to enhance its ductility and lower its hardness.
• Stress Relieving: A process that helps remove internal stresses generated during manufacturing.

The heat treatment process ensures that the tubes achieve the required tensile strength and hardness for their intended use.

Surface Finish:

The surface finish of ASTM A179 tubes is typically smooth, as they are cold drawn to improve both dimensional accuracy and surface quality. After the cold-drawing process, the surface may be further treated or polished to enhance its finish, especially in applications where aesthetic appearance or smoothness is important, such as in condenser tubes.

The typical surface finish of ASTM A179 tubes is:

• Cold drawn: Smooth and consistent surface finish due to the cold-working process.

In some cases, additional surface treatments like pickling (acid cleaning) may be performed to remove scale or other impurities from the surface.

Corrosion Resistance:

ASTM A179 steel, being a low-carbon steel, has limited resistance to corrosion in harsh environments. It is generally more susceptible to rust and corrosion compared to alloys that contain more chromium or other corrosion-resistant elements.

To improve corrosion resistance, ASTM A179 tubes can be treated with coatings such as:

• Hot-dip galvanizing: Coating the tubes with a layer of zinc to protect against rust.
• Protective coatings: Paint or other coatings to prevent exposure to moisture and corrosive environments.

Application:

• Power plants
• Oil refineries
• HVAC systems
• Chemical processing
• Marine systems

Conclusion

ASTM A179 seamless tubes are integral components in heat exchangers and condensers, renowned for their efficient heat transfer capabilities and durability in low-temperature applications. Manufactured to stringent ASTM A179 standards, these tubes offer excellent corrosion resistance and thermal conductivity, making them essential for industries requiring precise temperature control and efficiency.