API 5L pipeline steel generally refers to the executive standard of
pipeline steel pipe, which is used to transport oil, steam and
water extracted from the ground to oil and natural gas industrial
enterprises. API 5L pipeline steel for pipeline steel pipe includes
seamless steel pipe and welded steel pipe. At present, spiral
submerged arc welded pipe (SSAW), longitudinal submerged arc welded
pipe (LSAW) and resistance welded pipe (ERW) are commonly used in
oil pipeline in China.
When it comes to API 5L pipeline steel, we all know that there are two standards under API 5L pipeline
steel, API 5L PSL1 pipeline steel plate and API 5L PSL2 pipeline steel plate. Although there is only one
word difference between them, the contents of these two standards
are quite different.
1. API 5L pipeline steel is the abbreviation of product
specification level. The product specification level of pipeline
pipe is divided into API 5L PSL1 pipeline steel plate and API 5L PSL2 pipeline steel plate, and the quality grade is divided into API Spec 5L PSL1 and API
Spec 5L PSL2. API Spec 5L PSL2 is higher than API Spec 5L PSL1.
The two specifications are not only different in inspection
requirements, but also in chemical composition and mechanical
properties. Therefore, when ordering according to API 5L, the
contract terms must indicate the product specification level, that
is, API 5L PSL1 pipeline steel plate or API 5L PSL2 pipeline steel
plate, in addition to the usual indicators such as specification
and steel grade. API Spec 5L PSL2 is more strict than API Spec 5L
PSL1 in chemical composition, tensile properties, impact energy and
2. Impact performance is not required for API Spec 5L PSL1. For all
steel grades except X80, the average value of Akv at 0℃ of full size: longitudinal ≥41J, transverse≥27J. X80 steel grade, full size 0℃ average value of Akv: longitudinal ≥101J, transverse≥68J.
3. The API 5L pipeline steel should be hydraulic tested one by one,
and the standard does not stipulate that it is allowed to replace
water pressure undamaged. This is also a big difference between API
5L pipeline steel standard and Chinese standard. API 5L PSL1
pipeline steel plate does not require NDT, API 5L PSL2 pipeline
steel plate should be NDT one by one.