Name: China API 5L X56 PSL1 PSL2 ERW Steel Pipe Manufacturers Suppliers Factory - Shenzhoutong Steel Pipe
Brand: Shenzhoutong
SKU: 297734036

Tianjin Shenzhoutong Steel Pipe Co.,LTD

We are API 5L ERW steel pipe manufacturer, keep 20000 tons stock every month, size : 1/2" -24"

Professional team

200+ employees
Senior project managers effectively control all aspects of the project

Technical Support

we have profession team to insepct and follow up from production to after-sale services, visual and dimension test, hardness test,hydro test,UT test.......

2001

Established

25+

Foreign Export Experiences

2 certificate

API & ISO authorized

100000KM

Projects Completed

The Grade: X56 (L390)

The "X" designation indicates the minimum yield strength of the steel.

Strength: The number following the "X" represents the minimum yield strength in kilopounds per square inch (ksi) .

X56 means the pipe has a minimum yield strength of 56 ksi.

Metric Equivalent: In metric terms, X56 is also designated as L390, where 390 stands for the minimum yield strength in Megapascals (MPa) .

Mechanical Properties: For API 5L X56 PSL1, the key mechanical properties are:

Yield Strength (Min): 390 MPa (56,300 psi)

Tensile Strength (Min): 490 MPa (71,100 psi)

Chemical Composition (Max %) :
Grade	Carbon (C)	Manganese (Mn)	Phosphorus (P)	Sulfur (S)
X56	0.26	1.4	0.03	0.03

Key characteristics of PSL1 vs. PSL2:

Testing: PSL1 has less stringent testing requirements. For example, PSL2 mandates Charpy V-Notch (CVN) impact testing (toughness), while PSL1 does not require it unless specified by the buyer .

Chemical Limits: PSL1 allows for slightly higher levels of elements like Carbon and Manganese compared to PSL2.

Strength Limits: PSL1 only specifies a minimum yield and tensile strength. PSL2 specifies both a minimum and a maximum limit to prevent the steel from being too strong (which can lead to cracking in harsh environments) .

Carbon Equivalent (CE): PSL2 has mandatory limits on Carbon Equivalent to ensure better weldability, whereas PSL1 does not

Summary: PSL1 is the "commercial grade" for general use, while PSL2 is a "fracture-critical grade" for sour service, offshore, or arctic environments.

Manufacturing Process: ERW

ERW stands for Electric Resistance Welded. This describes how the pipe is manufactured .

Process: A flat steel strip (skelp) is cold-formed into a cylindrical shape. The edges are then heated using high-frequency electric current and forged together under pressure to form a longitudinal weld seam. No filler metal is used.

Synonyms: You might also see HFW (High-Frequency Welding), which is a more modern and precise type of ERW.

Size Range for X56: While API 5L covers a vast range, ERW X56 pipes are commonly available in outside diameters (OD) ranging from 1/2" (21.3mm) up to 24" (610mm) or even larger depending on the mill .

Wall Thickness: Typically ranges from 2.0mm to 22.2mm.