API 5L pipeline

API 5L is referred to API 5L pipelines. The pipe lines are broadly used to transport the oil, gas, water out of the ground to oil and gas industry enterprises. API 5L pipeline tube includes seamless and welded steel pipes with flat end, treaded end, socket end; the connection ways are welding connection, coupling connection, socket connection, etc.

API 5L Line Pipe for Oil Industry



Dimension Tolerance:

Specifications	OD(mm)		Wall Thickness(mm)
			A25.A.B		X42-X70
API 5L	＜60.3	+0.41/-0.40mm	D＜73.0	-160	D≥73.0	-120
	≥60.3	+0.75/-0.40mm	D≥73.0	-120	D>73	-120

Mechnical Properities:

Standards	Grade	Yield Strength(MPa)		Tensile Strength(MPa)		Elongation Rate
API 5L	P SL1
	A25	172		310
	A	207		331
	B	241		414
	X42	290		414
	X46	317		434
	X52	359		455
	X46	386		490
	X60	414		517
	X65	448		531
	X70	483		565
	P SL2
		Min	Max	Min	Max
	B	241	448	414	758
	X42	290	496	414	758
	X46	317	524	434	758
	X52	359	531	455	758
	X56	386	544	490	758
	X60	414	565	517	758
	X65	448	600	531	758
	X70	483	621	565	758
	X80	552	690	621	827

Chemical Properities

Standard	Grade	C	Mn	P		S
		Max	Max	Min	Max	Max
API 5L	P SL1
	A25	0.21	0.6		0.03	0.03
	A25	0.21	0.6	0.45	0.8	0.03
	A	0.22	0.9		0.03	0.03
	B	0.28	1.2		0.03	0.03
	X42	0.28	1.3		0.03	0.03
	X42,X52,X56	0.28	1.4		0.03	0.03
	X60,X65,X70	0.28	1.4		0.03	0.03
	P SL2
	B	0.24	1.2		0.025	0.015
	X42	0.24	1.3		0.025	0.015
	X42,X52,X56	0.24	1.4		0.025	0.015
	X60,X65,X70,X80	0.24	1.4		0.025	0.015

The Manufacturing Technology of API 5L
With the development and the progress of pipe line steel technology of welded pipe forming technology, the application range of welded pipe for pipe lines is gradually expanding, especially for the large diameters pipe products. Due to the cost factor, welded pipe is in a dominant position in pipeline market, and this has limited the development of stainless seamless pipe line. In 2004 seamless pipe line yield is about 40000 tons, steel grade range X42-70, product varieties include onshore and submarine pipeline.
 
Micro alloying heat treatment technology is adopted in the production of API5L pipe line; the production cost of stainless steel seamless pipe line is significantly higher than welded pipe line. With the increase of steel grade, due to carbon restrictions on steel pipe with steel grade higher than X80, seamless pipe made in conventional method could hardly meet user needs; all 12Cr1moV alloy pipes plants are currently researching on enhancing the corrosion resistance and stable working performance in different temperature levels, and in this aspect, An steel group Chengdu Iron & Steel Co., Ltd has already made some remarkable progress.