ASTM A671 & A672 Steel Pipe

Both ASTM A671 and A672 are the standard Specification used for EFW (Electric-Fusion Welded) Carbon Steel Pipe used for atmospheric and lower temperatures applications and high-pressure service at moderate temperatures, which differ only in the testing requirements. ASTM A671/A672 grade 65 is a type of plain carbon, killed, fine grain steel pipe manufactured by ASTM A516 65 steel plate. ASTM A671 CC65 and ASTM A672 C65 Pipes are fabricated from pressure vessel quality plate of numerous analysis and strength levels and appropriate for high-pressure service at an atmospheric and lower temp.

What is ASTM A671 Pipe?

ASTM A671 Pipe specification covers electric-fusion-welded pipe with filler metal added, fabricated from pressure vessel quality plate of several analyses and strength levels, and suitable for high-pressure service at atmospheric and lower temperatures. Heat treatment may or may not be required to attain the desired properties or to comply with applicable code requirements. The ASTM A671 Pipe material includes 0.24% of Carbon, 0.13% to 0.45% Silicon, and 0.79% to 1.30% of Manganese. This carbon-based stainless-steel alloy also contains trace amounts of other minerals. For example, 0.035% of phosphorus and Sulphur can be found in the alloy.

What is ASTM A672 Pipe?

ASTM A672 pipe is the Standard Specification for Electric-Fusion-Welded Pipe for High-Pressure Service at Moderate Temperatures. ASTM A672 LSAW welded steel pipe takes a hot rolling process which can be standardized, quenched, disinfected, and suitable for thermostat and other heat treatment methods, use of LSAW steel pipe is mainly for land, offshore oil, natural gas, liquid coal, and other long-distance transmission pipeline. ASTM A672 piping material’s chemical composition includes 0.25 carbon max, 0.98 Manganese, 0.64 molybdenum, and 0.45 Silicon. It allows certain mechanical properties such as Yield Strength (Mpa) of 37 and Tensile Strength (Mpa) of 65.

Mechanical Properties of ASTM A671/A672 Steel Pipe:

Products	Steel Grade	BASE METAL MECHANICAL COMPOSITION				Welding point tensile strength (N/mm2)	Remarks
		Yield point (N/mm2)	Tensile Stregth (N/mm2)	Test Pieces	Elongation (%)
Pipes for pressure service ASTM A671, A672	-/A45	-/165	-/310~450	-	-/30	-/310~450	A671/ A672
	-/A50	-/185	-/345~485		-/28	-/345~485
	CA55/A55	205	380~515		27	380~515
	-/B55	-/205	-/380~515		-/27	-/380~515
	CB60/B60	220	415~550		25	415~550
	CB65/B65	240	450~585		23	450~585
	CB70/B70	260	485~620		21	485~620
	-/C55	-/205	-/380~515		-/27	-/380~515
	CC60/C60	220	415~550		25	415~550
	CC65/C65	240	450~585		23	450~585
	CC70/C70	260	485~620		21	485~620

Chemical Requirements of ASTM A671/A672 Steel Pipe:

Specification	Steel grade	Chemical composition						Remarks
		C	Si	Mn	P	S	Ti
Pipes for pressure service ASTM A671, A672	-/A45	-/0.17	-	0.98	0.035	0.035	-	A671/ A672
	-/A50	-/0.22	-
	CA55/A55	0.28	-
	-/B55	-/0.20	0.13 ~0.45
	CB60/B60	0.24
	CB65/B65	0.28
	CB70/C70	0.31		1.30
	-/C55	-/0.18		0.55 ~0.98
	CC60/C60	0.21
	CC65/C65	0.24		0.79 ~1.30
	CC70/C70	0.27

Plate feeding → Edge Milling and Beveling → Board Probe → Edge Crimping →molding→Slag→Track Pre-Welding → Tab Welding → Inside Welding → Slag → Outside Welding → Tab Removal → Ultrasonic Inspection → X-ray Inspection → Mechanical Expansion → Flame Flat → Hydro-static Testing → Ultrasonic Inspection for pipe end and welding seam → Weld and Pipe End X-ray Inspection → Tube end weld grinding → End Facing and Beveling → Weighing and measuring → Spray paint Marking → Final Inspection → Storage → Storage and Shipment