ssaw steel-pipe

ssaw steel-pipe

2 year ago

55 0

Hydrogrand Steel Pipe Co.,ltd

 2 year year

Product details

SSAW (spiral submerged arc welded) steel pipe is a type of welded steel pipe that is made by rolling a low carbon structural steel or low alloy structural steel strip into a tube shape, and then welding the seam using submerged arc welding technology.

API X42 SSAW steel pipe refers to a type of steel pipe that meets the specifications of API 5L Grade X42 and is manufactured using the Spiral Submerged Arc Welding (SSAW) process.

API 5L Grade X42 is a commonly used grade specified in API 5L. It has a minimum yield strength of 42,000 psi (290 MPa) and a minimum tensile strength of 60,000 psi (415 MPa). Grade X42 pipes are suitable for applications where medium to high strength and good weldability are required.

API X42 SSAW steel pipes undergo stringent quality control measures during manufacturing to ensure compliance with the specified API 5L requirements. This includes testing for dimensions, mechanical properties, chemical composition, non-destructive testing, and visual inspection.

The process of API 5L X42 SSAW steel pipe:

Steel coils→Ray material test → Delivery straightening → Plate cutting and welding → circle shear edge milling → Forming → inside auto-welding → Outside auto-welding → Online ultrasonic inspection → Fixed length cutting → Visual inspection for outside seam → Visusl inspection for inside seam → X-ray inspection for welding seam → Even end and end bevel → Hydrostatic test → Ultrasonic inspection → Final product inspection → Marking → Store up

STANDARD OF SSAW STEEL PIPE

Standard	Grade	Chemical Composition(%)				Tensile STrength(min)	Yield Strength(min)
Standard	Grade	c Mn P S				Mpa	Mpa
API 5L PSL1	A	0.22	0.90	0.030	0.030	335	210
	B	0.28	1.20	0.030	0.030	415	245
	X42	0.28	1.30	0.030	0.030	415	290
	X46	0.28	1.40	0.030	0.030	435	320
	X52	0.28	1. 40	0.030	0.030	460	360
	X56	0.28	1.40	0.030	0.030	490	390
	X60	0.28	1.40	0.030	0.030	520	415
	X65	0.28	1.40	0.030	0.030	535	450
	X70	0.28	1.40	0.030	0.030	570	485
Standard	Grade	Chemical Composition(%)				Tensile STrength	Yield Strength
Standard	Grade	c Mn P S				Mpa	Mpa
API 5L PSL2	B	0.24	1.20	0.025	0.015	415-655	245-450
	X42	0.24	1.30	0.025	0.015	415-655	290-495
	X46	0.24	1.40	0.025	0.015	435-655	320-525
	X52	0.24	1. 40	0.025	0.015	460-760	360-530
	X56	0.24	1. 40	0.025	0.015	490-760	390-545
	X60	0.24	1. 40	0.025	0.015	520-760	415-565
	X65	0.24	1.40	0.025	0.015	535-760	450-600
	X70	0.24	1.40	0.025	0.015	570-760	485-635
	X80	0.24	1. 40	0.025	0.015	625-825	555-705

PSL 1 VS. PSL 2 SPEC SHEET

	PSL 1	PSL 2
Grade range	A25 through X70	GR B through X80	Table 1
Size range	0.405 through 80	4-2/1 through 80	Table 1
Type of pipe ends	Plain-end, threaded-end, bevelled-end, special coupling pipe	Plain-end	Table 1
Seam welding	All methods continous welding limited to Grade A25	All methods except continous and laser welding	Table 1
Electric welds: welder frequency	No minimum	100 kHz minimum	5.1.3.3.2
Heat treatments of electric welds	Required for grades > X42	Required for all grades (GR B through X80)	5.1.3.3.1; J.3.3.2:6.2.7
Chemistry: max C for seamless pipe	0.28% for grades > Gr B	0.24%	Tables 2A, 2B
Chemistry: max C for welded pipe	0.26% for grades > Gr B	0.22%	Tables 2A, 2B
Chemistry: max P	0.03%	0.03%	Tables 2A, 2B
Chemistry: max S	Only when purchases specifies SR18	0.02%	Tables 2A, 2B
Carbon equivalent	None	Maximum required for each grade	4.2:4.3:6.1.3: SR15.1
Yield strength, maximum	None	Maximum for each grade	Tables 3A, 3B
UTS, maximum	None required	Maximum for each grade	Tables 3A, 3B
Fracture toughness	Only when purchaser specifies SR4	Required for all grades	6.2.6; 9.3.5: 9.8.4; 9.10.7;
Non-destructive inspection of seamless pipes	Permitted	SR4 mandatory	Table 14 9.7.2.6
Repare by welding of pipe body, plate and skelp	Permitted by agreement	Prohibited	5.3.2;9.7.6: B.1;B.2
Certification	Certificates when specified per SR15	Prohibited	4.3;9.7.4.4;9.7.6;B.1.2;B.4
Traceability	Traceable only until all tests are passed unless SR15 is specified	Certificates (SR15.1) mandatory Traceable after completion of tests (SR15.2) mandatory	12.1 5.6

DIMENSION TOLERANCES OF SSAW STEEL PIPE

Standard	Standard
Standard	SY/T5040-2000	Y/T5037-2000	SY/T9711.1-197	ASTM A252	AWWA C200-9	API 5L PSL1
Tube end OD deviation	± 0.5%D	± 0.5%D	-0.79mm～+2.38	<± 0.1%T	<± 0.1%T	± 1.6mm
Wall thickness	± 10.0%T	D<508mm, ±12.5%T	- 8%T～+19.5%T	<- 12.5%T	-8%T～+19.5%T	5.0mm
Wall thickness	± 10.0%T	D>508mm, ±10.0%T	- 8%T～+19.5%T	<- 12.5%T	-8%T～+19.5%T	T≥15.0mm, ±1.5m

Advantages of API 5L X42 SSAW steel pipe

(1) The use of steel strips of the same width enables the production of steel pipes of different diameters, in particular the production of large-diameter steel pipes with narrow strip steel.

(2) Under the same pressure conditions, the spiral welds are subjected to a smaller stress than the straight seams, which is 75% to 90% of the straight seam welded pipes, and can therefore withstand greater pressures. Compared with the straight welded pipe with the same outer diameter, under the same pressure, the wall thickness can be reduced by 10% to 25%.

(3) Accurate size, general diameter tolerance is not more than 0.12%, deflection is less than 1/2000, ellipticity is less than 1%, and sizing and straightening processes are generally omitted.

(4) It can be continuously produced. In theory, it can produce infinitely long steel pipes, and the loss of cutting and cutting tails is small, which can increase the metal utilization rate by 6% to 8%.

(5) Compared with the straight seam welded pipe, its operation is flexible and the adjustment of the replacement type is convenient.

(6) The equipment is light and the initial investment is small. It can be made into a trailer-type flow unit and the welded pipe can be produced directly at the construction site where the pipeline is laid.

(7) It is easy to realize mechanization and automation.