P195TR2 SSAW Steel Pipe

1. P195 (Grade Designation)

This refers to the grade of the steel, which indicates its minimum yield strength.

P: Stands for "Pipeline".

195: This number represents the Minimum Specified Yield Strength (SMYS) in Megapascals (MPa).

195 MPa is equivalent to approximately 28,300 psi (pounds per square inch).

What it means: This is a relatively low-to-medium strength grade. For comparison, common high-strength pipeline grades are X42 (290 MPa), X52 (360 MPa), X70 (483 MPa), etc. P195 is often used for less demanding applications, such as low-pressure gathering lines or water pipelines, where high strength is not the primary requirement.

2. TR2 (Thermomechanical Treatment)

This indicates the type of processing the steel plate has undergone, which directly affects its mechanical properties.

TR: Stands for "Thermomechanically Rolled". This is a controlled rolling process.

2: The number specifies a particular subset or requirement within the thermomechanical rolling process. According to standards like API 5L, the number indicates the testing and property requirements:

TR2 (Class 2): Pipe supplied in the thermomechanically rolled condition. The pipe is typically tested in the flattened condition for tensile properties and must meet specific notch-toughness requirements (e.g., Charpy V-Notch impact tests).

What it means: The TR process refines the grain structure of the steel, resulting in a good combination of high strength and excellent toughness without requiring a full heat treatment after forming. This makes the pipe more resistant to fracture and cracking, especially in cold environments.

3. SSAW (Manufacturing Process)

This acronym describes how the pipe was manufactured.

SSAW: Stands for "Spiral Submerged Arc Welded" (also known as HSAW - Helical Submerged Arc Welded).

How it's made: A long, continuous strip of steel (skelp) is fed through a series of forming rollers that bend it into a helical (spiral) shape. The pipe is formed at an angle, creating a continuous spiral seam.

Submerged Arc Welding (SAW): The weld is made by an arc struck beneath a blanket of granular fusible flux. This produces extremely high-quality, strong, and smooth welds, both on the inside and outside of the pipe.

Key Advantages of SSAW:

Can produce large diameters from a narrower steel strip.

Offers great flexibility in diameter and wall thickness using the same forming equipment.

The spiral shape can sometimes distribute stress more evenly around the pipe.

Summary: Putting It All Together

A P195TR2 SSAW Steel Pipe is:

A welded steel pipe for pipeline use.

Made from low-to-medium strength steel with a minimum yield strength of 195 MPa.

Processed using thermomechanical rolling to ensure good strength and toughness properties that meet specific class 2 testing requirements.

Manufactured by the spiral submerged arc welding process, making it suitable for large-diameter applications.

Typical Applications:

This type of pipe is commonly used in:

Low-pressure oil and gas gathering lines

Water transmission and distribution pipelines

Piling (foundation support for structures)

Slurry transport

Structural columns and supports (where its large diameter is beneficial)

Relevant Standards:

This designation and its technical requirements are typically governed by international standards, most notably:

API 5L: Specification for Line Pipe (from the American Petroleum Institute) – This is the most common global standard for pipeline tubes.

ISO 3183: Petroleum and natural gas industries - Steel pipe for pipeline transportation systems (International Organization for Standardization).

The "P195TR2" designation is specific to the API 5L standard.