ASTM A179 Effective usage in heat exchange and condenser

ASTM A179 / A179M – 90a Standard Specification for Seamless Cold-Drawn Low-Carbon Steel Heat-Exchanger and Condenser Tubes

Scope of ASTM A179

ASTM A179 Tubes shall be made by the seamless process and shall be cold drawn. Heat and product analysis shall be performed wherein steel materials shall conform to required chemical compositions of carbon, manganese, phosphorus, and sulfur. The steel materials shall also undergo hardness test, flattening test, flaring test, flange test, and hydrostatic test.

Because of ASTM A179 grade’s temperature withstanding capabilities, it is applied to steel pipe of tubular heat exchanger, condensers and similar heat transfer equipment. Our ASTM A179 seamless tubes are used in sugar mills & distilleries, pumps and petrochemicals, cement and construction industries and steel plants.

This specification covers minimum-wall thickness, seamless cold-drawn low-carbon steel tubes for tubular heat exchangers, condensers, and similar heat transfer apparatus. Tubes shall be made by the seamless process and shall be cold drawn. Heat and product analysis shall be performed wherein steel materials shall conform to required chemical compositions of carbon, manganese, phosphorus, and sulfur. The steel materials shall also undergo hardness test, flattening test, flaring test, flange test, and hydrostatic test.

Note:

• Mill test certificates will be issued according to EN10204.3
• All tubes shall be supplied as per applicable ASTM Specification.
• The tubes Shall be Seamless and the testing shall be as per A 450 / A450M.

Features of ASTM A179

ASTMA179/ASME SA179 standard is applicable for steel pipes together with outside diameter of 1/8in-3in. (32 mm to 76.2 mm). Our rolling technology has reached the international advanced spot. JST is able to manufacture cold drawn seamless steel tubes with uniform wall depth. Their tolerance is relatively smaller standard your own.

When seamless carbon steel pipes are during the last cold drawing procedure, they will enter micro oxidization and non-oxidation heat treatment furnace for thermal treatment (Temperature is 1200℉ (650℃) if not more.). This makes the surface of cold drawn seamless steel tubes match the no oxide scale standards, and guarantees smooth surface and stable performance.

JST adopts professional hardness testing equipment to find out the hardness of seamless carbon steel pipes. The Rockwell hardness value not able to exceed 72 HRB.

Top rated program customers’ requirements, we can analyze the cold drawn seamless steel tube advertise its chemical composition meet standards. We choose one from 250 pipes or select one in a furnace to investigate. If the product analysis fails, then choose another two seamless carbon steel pipes. All elements of two steel pipes tend to be in accordance with standards, and then these pipes can be delivered.

Application of ASTM A179 tube

Chemical components (%) of ASTM A179

C	Si	Mn	P	S	Mo	Cr	V
0.06-0.18	/	0.27-0.63	≤0.035	≤0.035	/	/	/

Mechanical properties of ASTM A179

Tensile Strength (Mpa)	Yield Strength (Mpa)	Elongation (%)	Hardness (HRB)
≥325	≥180	≥35	≤72

Wall thickness tolerance of ASTM A179 Tube

Outside Diameter	Wall thickness Tolerance %
In. (mm)	Over (+)	Under (-)
1 ½ (38.1) and under	20	0
Over 1½ (38.1)	22	0

Wall thickness tolerance of ASTM A179 Tube

Outside Diameter	Wall thickness Tolerance %
In. (mm)	Over (+)	Under (-)
1 ½ (38.1) and under	20	0
Over 1½ (38.1)	22	0

Cut length tolerance of cold-finished seamless tubes

Outside Diameter	Cut Length, in.(mm)
In.(mm)	Over (+)	Under (-)
All Sizes	3⁄16 [5]	0 [0]
Under 2 [50.8]	1⁄8 [3]	0 [0]
2 [50.8] and over	3⁄16 [5]	0 [0]
Under 2 [50.8]	1⁄8 [3]	0 [0]
2 [50.8] and over	3⁄16 [5]	0 [0]

These permissible variations in length apply to tubes before bending. They apply to cut lengths up to and including 24 ft [7.3 m]. For lengths greater than 24 ft [7.3 m], the above over-tolerances shall be increased by 1⁄8 in. [3 mm] for each 10 ft [3 m] or fraction thereof over 24 ft or 1⁄2 in. [13 mm], whichever is the lesser.

This is an effective way of metal corrosion, the use of the main features are the following:

1. ASTM A179 cold drawn seamless pipe manufacturers with thick dense dense zinc layer covered in the cold drawn seamless tube surface, it can avoid cold drawn seamless tube matrix and any contact with the corrosion solution to protect the steel matrix from corrosion. In the general atmosphere, the surface of the zinc layer to form a layer of thin and dense zinc oxide surface, it is difficult to dissolve in water, so the steel matrix plays a protective role. If zinc oxide and other components of the atmosphere produce insoluble zinc salt, the anti-corrosion effect is more desirable.
2. With iron – zinc alloy layer, combined with dense, and with the unique anti-corrosion in the marine atmosphere and atmospheric atmosphere.
3. ASTM A179 cold drawn seamless pipe with a strong wear resistance due to the combination of solid, zinc – iron miscible.
4. Since zinc has good ductility, its alloy layer and steel base attached to a solid, so hot-rolled parts can be cold, rolling, drawing, bending and other molding without damage to the coating.
5. Hot-dip galvanized structural steel pipe, the equivalent of an annealing treatment, can effectively improve the mechanical properties of steel matrix to eliminate the steel forming welding stress, is conducive to the steel structure for turning.
6. The surface of cold drawn seamless pipe after hot galvanized is bright and beautiful.
7. Pure zinc layer is the most hot galvanized layer of galvanized layer, its nature is basically close to pure zinc, with ductility, so it is full of flexibility.

SA-450/SA-450M tolerance

ASTM A450 covers carbon and low alloy steel tube. Steel samples shall be melt processed and shall either be ingot cast or strand cast. Heat and product analyses shall be performed on the steel materials. Steel specimens shall also undergo tensile tests and shall conform to required values of yield strength and elongation. Flattening test, reverse flattening test, flaring test, flange test, hardness test, hydrostatic test, air underwater pressure test, and nondestructive tests shall be performed on the steel materials.

OD In (mm)	+	-	WT In(mm)	+	-
<1(25.4)	0.1	0.1	≤1.1/2(38.1)	0.2	0
11.1/2(25.438.1)	0.15	0.15	>1.1/2(38.1)	0.22	0
>1.1/2<2(38.150.8)	0.2	0.2
2<2.1/2(50.863.5)	0.25	0.25
2.1/2<3(63.576.2)	0.3	0.3
34(76.2101.6)	0.38	0.38
>47.1/2(101.6190.5)	0.38	0.64
>7.1/29(190.5228.6)	0.38	1.14

Relataed ASTM A179 tubes