ASTM A53 Grade B Sch 80 Pipe

What is ASTM A53 Grade B Sch 80 Pipe?

ASTM A53 Grade B Sch 80 pipe is a high-strength, thick-walled steel pipe produced in accordance with the ASTM A53 standard. It is commonly used for conveying fluids, gases, and industrial pressure systems, and is also widely used in structural engineering. The ASTM A53 standard covers seamless and welded steel pipes, of which Grade B has higher tensile strength and yield strength, and is suitable for scenarios that need to withstand greater pressure and stress. Grade B has a minimum tensile strength of 415 MPa and a minimum yield strength of 240 MPa, which is better than Grade A. Sch 80 means that the wall thickness of the pipe is thicker, and the wall thickness value varies with the pipe diameter. For example, the wall thickness of a 1-inch pipe is 3.73 mm, and the wall thickness of a 2-inch pipe is 5.54 mm. This thicker wall thickness enables the pipe to withstand higher working pressures.

Raw materials of ASTM A53 pipe

The steel for making ASTM A53 pipe (both for seamless and welded) shall be according following processes: open hearth electric furnace, or basic oxygen.

Raw steel material of different grades are independently strand cast identification of resultant transition material is needed. Manufacturer should remove transition material by any established procession that could clearly separate the grades.

The welding seam for ERW welding processes in ASTM A53 Grade B pipe should be done heat treatment after welding to a min of 540℃ 1000℉.

Consequently, there is no untempered martensite remains, or use the other ways of non untempered martensite remains.

In case the pipe is cold expanded, the expansion amount shall not exceed 1 1/2% of the pipe diameter.

ASTM A53 Grade B pipe is the most common used grade in ASTM A53 standard. And it includes three types in pipeline systems:

a. Seamless type
b. Welded type (ERW, EFW, HFW, SAW)
c. Hot Dipped Galvanized type

ASTM A53 (ASME SA53) carbon steel pipe is a specification that covers seamless and welded black and hot-dipped galvanized steel pipe in NPS 1/8″ to NPS 26.

ASTM A53 Grade B Sch 80 Pipe Dimensions in mm

NPS Designator	DN Designator	Outside Diameter	Inside Diameter	Wall Thickness	Nominal Weight (Mass) per unit Length
		(mm)	(mm)	(mm)	Plain End (kg/m)	Threads & Couplings (kg/m)
1/8″	6	10.3	5.5	2.41	0.47	0.46
1/4″	8	13.7	7.7	3.02	0.8	0.8
3/8″	10	17.1	10.7	3.2	1.1	1.1
1/2″	15	21.3	13.9	3.73	1.62	1.62
3/4″	20	26.7	18.8	3.91	2.2	2.21
1″	25	33.4	24.3	4.55	3.24	3.25
1-1/4″	32	42.2	32.5	4.85	4.47	4.49
1-1/2″	40	48.3	38.1	5.08	5.41	5.39
2″	50	60.3	49.3	5.54	7.48	7.55
2-1/2″	65	73	59	7.01	11.41	11.52
3″	80	88.9	73.7	7.62	15.27	15.39
3-1/2″	90	101.6	85.4	8.08	18.63	18.82
4″	100	114.3	97.2	8.56	22.32	22.6
5″	125	141.3	122.3	9.52	30.94	31.42
6″	150	168.3	146.3	10.97	42.56	43.05
8″	200	219.1	193.7	12.7	64.64	65.41

ASTM A53 Grade B Sch 80 pipes are produced in two ways: seamless and welded. Seamless pipes are formed by perforating solid round steel and then rolling. They have higher strength and pressure resistance and are suitable for high temperature and high pressure environments. Welded pipes are manufactured using electric resistance welding (ERW) or continuous welding processes. They are low cost and are mostly used in medium and low pressure applications. This type of pipe is widely used in many fields, especially in industrial transportation systems, for the transportation of media such as water, natural gas, oil and steam; in boilers and heat exchangers, for fluid circulation under high temperature and high pressure conditions; in construction and structural engineering, they are used as pillars and load-bearing structures; in the oil and gas industry, they are suitable for wellhead equipment and transportation systems.

This steel pipe has significant advantages. The thick-wall design allows it to maintain reliability under high pressure, and the excellent mechanical properties provide stability for a variety of industrial applications. In addition, through galvanizing or coating treatment, the corrosion resistance of the pipeline can be improved so that it can still be used for a long time in harsh environments. Although Sch 80's wall thickness increases the difficulty of cutting and welding, its high strength and durability provide an ideal solution for complex projects. Overall, ASTM A53 Grade B Sch 80 pipe is an indispensable and important material in industrial conveying and structural uses. Its strong performance and versatility make it the first choice for many engineering projects.

Chemical composition and mechanical properties of A53

Grade	Carbon	Manganese	Phosphorus	Sulfur	Copper	Nickel	Chromium	Molybdenum	Vanadium
Type S (Seamless Pipe)
Grade A	0.25	0.95	0.05	0.045	0.4	0.4	0.4	0.15	0.08
Grade B	0.3	1.2	0.05	0.045	0.4	0.4	0.4	0.15	0.08
Type E (ERW)
Grade A	0.25	0.95	0.05	0.045	0.4	0.4	0.4	0.15	0.08
Grade B	0.3	1.2	0.05	0.045	0.4	0.4	0.4	0.15	0.08
Type F (Furnace-Welded Pipe)
Grade A	0.3	1.2	0.05	0.045	0.4	0.4	0.4	0.15	0.08

Strength	Grade A	Grade B
Tensile Strength (Min)	48,000 psi (330 MPa)	60,000 psi (415 MPa)
Yield Strength (Min)	30,000 psi (205 MPa)	35,000 psi (240 MPa)
Elongation in 2 in. or 50 mm	e = 625,000 [1940] A^0.2 / U^0.9	e = 625,000 [1940] A^0.2 / U^0.9

There are two methods to specify the elongation in ASTM A53 standard:
Methode A, By equation: e = 625 000 [1940] A^0.2/U^0.9
Explanations:
e = minimum elongation in 2 inch (50mm) in percent rounded to the nearest percent
A = specimen cross-sectional area, rounded to 0.01 in.^2 (1 mm^2), based on the specified outside diameter to the nominal specimen width and wall thickness. If the area calculated is equal or above than 0.75 in.^2 (500 mm^2), then the value 0.75 in.^2 (500 mm^2) shall be applied, and
U = specified tensile strength, psi (Mpa)