A179 / SA179 HEAT EXCHANGER PIPE

ASTM A179 (also known as ASME SA179) is a standard specification for seamless cold-drawn low-carbon steel heat exchanger and condenser tubes. These tubes are designed for use in heat exchangers, condensers, and other heat transfer applications where the operating temperature ranges from -20°F to 450°F (-29°C to 232°C). ASTM A179/ASME SA179 heat exchanger tubes are widely used in industries such as HVAC, power plants, petrochemical, and chemical processing.

Manufacture:Seamless process ,cold drawn.
Wall thickness(WT): 2.0 mm——12.7 mm.
Outer diameter (OD): 12.7mm——76.2 mm

Some key features of ASTM A179/ASME SA179 heat exchanger tubes include:

Seamless construction: The tubes are cold-drawn and seamless, which ensures uniformity in wall thickness and enhanced mechanical properties.
Low carbon content: The low-carbon steel used in these tubes provides good heat transfer properties and resistance to oxidation at high temperatures.
Dimensional accuracy: The tubes are manufactured with strict dimensional tolerances, ensuring a proper fit in heat exchanger and condenser applications.
Surface finish: The tubes have a smooth internal surface that reduces friction and promotes efficient heat transfer.
Wide range of sizes: ASTM A179/ASME SA179 heat exchanger tubes are available in various outer diameters, wall thicknesses, and lengths to accommodate different heat transfer requirements.

Some common applications of ASTM A179/ASME SA179 heat exchanger tubes are:

Heat exchangers in power plants
Condensers in air conditioning systems
Evaporator tubes in refrigeration systems
Heat transfer equipment in chemical and petrochemical industries

To ensure the quality and performance of ASTM A179/ASME SA179 heat exchanger tubes, they undergo various tests, including hydrostatic testing, flattening testing, flaring testing, and non-destructive testing such as eddy current testing, ultrasonic testing, and radiographic testing. When selecting and installing these tubes in your project, it’s crucial to work with an engineer or a professional who can guide you on the right material selection, installation practices, and adherence to relevant safety standards and regulations.

ASTM A179,ASME SA179 Seamless Tube Specification:

OD (mm)

Wall Thickness(mm)

2.5

3.5

4.5

6.5-7

7.5-8

8.5-9

9.5-10

Φ25-Φ28

●

Φ32

●

Φ34-Φ36

●

Φ38

●

Φ40

●

Φ42

●

Φ45

●

Φ48-Φ60

●

Φ63.5

●

Φ68-Φ73

●

Φ76

●

Manufacture
ASTM A179,ASME SA179 steel tubes are made by the seamless process and shall be cold drawn.

Heat Treatment of ASTM A179,ASME SA179
ASTM A179,ASME SA179 steel tubes are heat treated after the final cold draw pass at a temperature of 1200°F [650°C] or higher.

Chemical Composition of ASTM A179,ASME SA179 Seamless Heat-Exchanger and Condenser Tubes

Material	Chemical Composition(%)
Material	C	Si	Mn	P	S
ASTM A179	0.06-0.18	≤ 0.25	0.27-0.63	≤0.035	≤0.035

Mechanical Propertie of ASTM A179,ASME SA179 Seamless Heat-Exchanger and Condenser Tubes

Grade	ASTM A179
Tensile Strength(MPa)	≥325
Yield Strength(MPa)	≥180
Elongation,%	≥35
Hardness, HRB	≤72

Note —Tubing smaller in outside diameter and having a thinner wall than indicated in this specification is available. Mechanical property requirements do not apply to tubing smaller than 1/8 in. [3.2 mm] in outside diameter or with a wall thickness under 0.015 in. [0.4 mm].

The dimensional tolerances of ASTM A179,ASME SA179 Seamless Heat-Exchanger and Condenser Tubes

Tolerances of Wall Thickness

Outside Diameter, in. [mm]	Wall Thickness, %
	0.095[2.4] and Under		Over 0.095 to 0.150 [2.4 to 3.8], incl		Over 0.150 to 0.180 [3.8 to 4.6], incl		Over 0.180,[4.6]
	Over	Under	Over	Under	Over	Under	Over	Under
Seamless, Cold-Finished Tubes
	Over				Under
1 1 ⁄ 2 [38.1] and under	20				0
Over 1 1 ⁄ 2 [38.1]	22				0

Tolerances of Outside Diameter

Outside Diameter,in. [mm]	Permissible Variations, in. [mm]
Outside Diameter,in. [mm]	Over	Under
Under 1 [25.4]	0.004 [0.1]	0.004 [0.1]
1 to 1 1 ⁄ 2 [25.4 to 38.1], incl	0.006 [0.15]	0.006 [0.15]
Over 1 1 ⁄ 2 to 2 [38.1 to 50.8], excl	0.008 [0.2]	0.008 [0.2]
2 to 2 1 ⁄ 2 [50.8 to 63.5], excl	0.010 [0.25]	0.010 [0.25]
2 1 ⁄ 2 to 3 [63.5 to 76.2], excl	0.012 [0.3]	0.012 [0.3]
3 to 4 [76.2 to 101.6], incl	0.015 [0.38]	0.015 [0.38]
Over 4 to 7 1 ⁄ 2 [101.6 to 190.5], incl	0.015 [0.38]	0.025 [0.64]
Over 7 1 ⁄ 2 to 9 [190.5 to 228.6], incl	0.015 [0.38]	0.045 [1.14]

Tolerances of Length

Method of Manufacture	Outside Diameter, in. [mm]	Cut Length,in. [mm]
Method of Manufacture	Outside Diameter, in. [mm]	Over	Under
Seamless, cold-finished	Under 2 [50.8]	1 ⁄ 8 [3]	0 [0]
	2 [50.8] and over	3 ⁄ 16 [5]	0 [0]
	2 [50.8] and over	3 ⁄ 16 [5]	0 [0]

U-Bend Fabrication Tolerances

Item	Condition (when)	Tolercance
	Nominal bend radius ≤ 2 x nominal OD	less than or equal to 12%
Ovality	2 x nominal OD < Nominal bend radius ≤ 4 x nominal OD	less than or equal to 10%
	Nominal bend radius > 4 x nominal OD	less than or equal to 5%
	Nominal bend radius ≤ 2 x nominal OD	0.75 x nominal wall
Mimimum wall thickness	2 x nominal OD < Nominal bend radius ≤ 4 x nominal OD	0.8 x nominal wall
	Nominal bend radius > 4 x nominal OD	0.9 x nominal wall
	Nominal bend radius ≤ 8″ (200mm)	+/-3/64″(1mm)
Bending Radius	8″ (200mm) < Nominal bend radius ≤ 16″ (400mm)	+/-1/16″(1mm)
	Nominal bend radius >16″ (400mm)	+/-5/64″(1mm)
Disrance between legs		Max 1/16″(1.5mm)
Wall thinning of bending area		Max 17%
Difference between leg lengths at the ends	Leg length ≤ 16′ (4.88m)	+1/8″(3mm)
Difference between leg lengths at the ends	Leg length > 16′ (4.88m)	+3/16″(5mm)
Deviation from plane of bend		≤ 3/16″(1.5mm)
Flattening on bend		≤ 10% nominal diameter
Straight leg length	≤5m	+1/8″(3mm)
Straight leg length	>5m	+3/16(5mm)
Total tube length including radius	≤6m	+3/16(5mm)
Total tube length including radius	>6m	+5/16″(8mm)

SA-450/SA-450M

OD In (mm)	+	–	WT In (mm)	+	–
<1(25.4)	0.10	0.10	≤1.1/2(38.1)	20%	0
1∼1.1/2(25.4∼38.1)	0.15	0.15	>1.1/2(38.1)	22%	0
>1.1/2∼<2(38.1∼50.8)	0.20	0.20
2∼<2.1/2(50.8∼63.5)	0.25	0.25
2.1/2∼<3(63.5∼76.2)	0.30	0.30
3∼4(76.2∼101.6)	0.38	0.38
>4∼7.1/2(101.6∼190.5)	0.38	0.64
>7.1/2∼9(190.5∼228.6)	0.38	1.14

Pressure Temperature Rating

NPS (in)	Outside Diameter (in)	ASTM A106 Grade B Pipe Schedule
		SCH 10	SCH 20	SCH 30	SCH STD	SCH 40	SCH 60	SCH XS	SCH 80	SCH 100	SCH 120	SCH 140	SCH 160	SCH XXS
		Wall Thickness (in)
1/8	0.405				0.068	0.068		0.095	0.095
1/4	0.540				0.088	0.088		0.119	0.119
3/8	0.675				0.091	0.091		0.126	0.126
1/2	0.840				0.109	0.109		0.147	0.147				0.187	0.294
3/4	1.050				0.113	0.113		0.154	0.154				0.219	0.308
1	1.315				0.133	0.133		0.179	0.179				0.250	0.358
1 1/4	1.660				0.140	0.140		0.191	0.191				0.250	0.382
1 1/2	1.900				0.145	0.145		0.200	0.200				0.281	0.400
2	2.375				0.154	0.154		0.218	0.218				0.344	0.436
2 1/2	2.875				0.203	0.203		0.276	0.276				0.375	0.552
3	3.500				0.216	0.216		0.300	0.300				0.438	0.600
3 1/2	4.000				0.226	0.226		0.318	0.318
4	4.500				0.237	0.237		0.337	0.337		0.438		0.531	0.674
5	5.563				0.258	0.258		0.375	0.375		0.500		0.625	0.750
6	6.625				0.280	0.280		0.432	0.432		0.562		0.719	0.864
8	8.625		0.250	0.277	0.322	0.322	0.406	0.500	0.500	0.594	0.719	0.812	0.906	0.875
10	10.750		0.250	0.307	0.365	0.365	0.500	0.500	0.594	0.719	0.844	1.000	1.125	1.000
12	12.750		0.250	0.330	0.375	0.406	0.562	0.500	0.688	0.844	1.000	1.125	1.312	1.000
14	14.000	0.250	0.312	0.375	0.375	0.438	0.594	0.500	0.750	0.938	1.094	1.250	1.406
16	16.000	0.250	0.312	0.375	0.375	0.500	0.656	0.500	0.844	1.031	1.219	1.438	1.594
18	18.000	0.250	0.312	0.438	0.375	0.562	0.750	0.500	0.938	1.156	1.375	1.562	1.781
20	20.000	0.250	0.375	0.500	0.375	0.594	0.812	0.500	1.031	1.281	1.500	1.750	1.969
22	22.000	0.250	0.375	0.500	0.375		0.875	0.500	1.125	1.375	1.625	1.875	2.125
24	24.000	0.250	0.375	0.562	0.375	0.688	0.969	0.500	1.219	1.531	1.812	2.062	2.344
30	30.000	0.312	0.500	0.625	0.375			0.500
32	32.000	0.312	0.500	0.625	0.375	0.688
34	34.000	0.312	0.500	0.625	0.375	0.688
36	36.000	0.312	0.500	0.625	0.375	0.750
42	42.000		0.500	0.625	0.375	0.750

What are the advantages of using ASTM A179/ASME SA179 heat exchanger tubes over other materials?

ASTM A179/ASME SA179 heat exchanger tubes offer several advantages over other materials in heat exchanger and condenser applications. Some of these benefits include:

Excellent heat transfer properties: The low-carbon steel used in ASTM A179/ASME SA179 tubes has good thermal conductivity, which allows for efficient heat transfer between the fluid inside the tube and the surrounding environment.

High corrosion resistance: The low-carbon steel composition of these tubes provides resistance to oxidation and corrosion at high temperatures, making them suitable for various industrial applications where corrosive environments are common.

Seamless construction: ASTM A179/ASME SA179 tubes are cold-drawn and seamless, ensuring uniform wall thickness and improved mechanical properties. This seamless construction reduces the risk of leaks and enhances the tube’s overall strength and durability.

Dimensional accuracy: These tubes are manufactured with strict dimensional tolerances, ensuring a proper fit in heat exchanger and condenser applications. This accuracy helps prevent leakage and ensures efficient heat transfer.

Cost-effective: Low-carbon steel, such as that used in ASTM A179/ASME SA179 tubes, is generally more cost-effective than other materials like stainless steel or high-alloy steels. This makes them an attractive option for projects with budget constraints.

Ease of fabrication: The low-carbon steel used in these tubes is relatively easy to work with, allowing for convenient fabrication processes like bending, welding, and flaring without compromising the material’s properties.

Wide range of sizes: ASTM A179/ASME SA179 heat exchanger tubes are available in various outer diameters, wall thicknesses, and lengths, making them suitable for a wide range of applications and accommodating different heat transfer requirements.

Despite these advantages, it is essential to consult with an engineer or a professional when selecting the appropriate material for your heat exchanger or condenser application. Factors such as operating temperature, pressure, corrosive environment, and specific industry standards should be taken into account when choosing the right material.

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