info@lefinsteel.com

+8615122229899

Home
About us
Products
Resource
Project
Service Capability
Certificates
Contact Us

中文

Tianjin Lefin Industrial Co.,Ltd

Our main products include 1/2inch to 16 inch ERW PIPE/GI PIPE which has been produced according to BS1387/ASTM A53/EN10219/EN10255/EN10217 Standard

PRODUCT

ABOUT US

Service Capability

Certificates

Project

Tianjin Lefin Industrial Co.,Ltd.

Our main products include 1/2inch to 16 inch ERW PIPE/GI PIPE which has been produced according to BS1387/ASTM A53/EN10219/EN10255/EN10217 Standard

OEM&ODM

Has rich experience in steel pipe processing, can be customized according to customer requirements according to the drawing and sample processing, assist in the development of new products.

PRODUCTS CENTER

zambia HOT DIP GALVANIZED STEEL PIPE

zambia API 5L X70 PSL2 STEEL PIPE

Category:

Product Description

API 5L X70 PSL2 steel pipe is a type of high-strength steel pipe widely used in the field of oil and gas transportation pipelines.

Characteristic category	Specific Indicators/Requirements
Standard level	API SPEC 5L (American Petroleum Institute standard), product specification level 2 (PSL2)
intensity index	Minimum yield strength ≥ 485 MPa (70 ksi); Tensile strength 570 - 760 MPa
Toughness requirements	Generally, the average value of the Shiba impact energy at 0°C should be: longitudinal ≥ 41J, transverse ≥ 27J
Chemical composition:	Low-carbon microalloying design, typical carbon content ≤ 0.24% (PSL2); Commonly added microalloying elements such as Nb, V, Ti, etc.
Typical process	Seamless rolling (SMLS), straight seam submerged arc welding (LSAW), resistance welding (ERW), etc. can be adopted
Quality inspection	Conduct non-destructive tests such as ultrasonic and X-ray inspections on each individual piece; carry out hydrostatic tests.
Main applications	Long-distance oil and gas pipelines on land and at sea, pipelines in acidic environments, pipelines in extremely cold regions, and high-pressure gas networks in cities.

In-depth Understanding of PSL2 Level

PSL (Product Specification Level) is a key concept in the API 5L standard, used to differentiate different quality grades. PSL2 is much more stringent than PSL1, mainly manifested in the following aspects:

• More stringent control of chemical components:

PSL2 imposes stricter upper limits on the contents of elements such as carbon, sulfur, and phosphorus, in order to enhance the weldability and corrosion resistance.

• Higher toughness requirements:

PSL2 mandates the conduct of the Schaeffer V-notch impact test to ensure that the steel pipe can resist brittle fracture under low temperatures or impact conditions, while PSL1 does not have such a requirement.

• Comprehensive non-destructive testing:

PSL2 mandates that a full non-destructive inspection of the entire pipe body (such as ultrasonic or radiographic testing) be conducted for each steel pipe to detect extremely subtle internal defects.

Sizing and Application Suggestions

When selecting and applying API 5L X70 PSL2 steel pipes in actual projects, there are several key points that require special attention:

• Pay attention to additional requirements:

For steel pipes used in acidic environments containing hydrogen sulfide (H₂S), it is necessary to ensure that they meet the additional requirements for resistance to hydrogen-induced cracking (HIC) and/or resistance to sulfide stress cracking (SSC), as specified in standards such as NACE MR0175/ISO 15156.

• Confirm the delivery status:

The performance of steel pipes is closely related to their heat treatment state (delivery status). The common delivery states of X70 PSL2 include "Q" (quenching + tempering) or "M" (thermomechanical controlled rolling). Pipes in the "Q" state (quenching and tempering treatment) typically have better comprehensive mechanical properties, especially toughness and weldability.

• Pay attention to on-site welding:

The X70 steel has high strength, and the on-site circumferential welding requires strict process control. Key measures include: preheating above 100°C to prevent cracks; using low-hydrogen welding materials (such as E6010 electrode for root welding); and strict welding worker training and process assessment.