GB/T 31937 L245J/BJ L290J/X42J L320J/X46J L360J/X52J L390J/X56J SAWL Carbon Welded Steel Pipe For Pipeline Of Coal Slurry
Introduction
The GB/T 31937 standard specifies the requirements for L245J/BJ, L290J/X42J, L320J/X46J, L360J/X52J, and L390J/X56J carbon welded steel pipes used in the construction of pipelines for coal slurry transportation. This article provides an overview of the material, specification, chemical composition, mechanical properties, and application of these steel pipes.
Material
The L245J/BJ, L290J/X42J, L320J/X46J, L360J/X52J, and L390J/X56J steel pipes specified in GB/T 31937 are made from carbon steel. Carbon steel is a widely used material in the construction industry due to its excellent mechanical properties and cost-effectiveness.
Specification
The GB/T 31937 standard outlines the specifications for the L245J/BJ, L290J/X42J, L320J/X46J, L360J/X52J, and L390J/X56J carbon welded steel pipes. These specifications include dimensions, tolerances, and technical requirements to ensure the pipes meet the necessary standards for coal slurry pipeline construction.
Chemical Composition
The following table presents the chemical composition of the L245J/BJ, L290J/X42J, L320J/X46J, L360J/X52J, and L390J/X56J carbon welded steel pipes:
| Grade | Chemical Composition (%) |
| L245J/BJ | C: ≤0.22, Si: ≤0.45, Mn: 0.45-1.40, P: ≤0.025, S: ≤0.015 |
| L290J/X42J | C: ≤0.22, Si: ≤0.45, Mn: 1.30-1.70, P: ≤0.025, S: ≤0.015 |
| L320J/X46J | C: ≤0.22, Si: ≤0.45, Mn: 1.40-1.70, P: ≤0.025, S: ≤0.015 |
| L360J/X52J | C: ≤0.22, Si: ≤0.45, Mn: 1.40-1.70, P: ≤0.025, S: ≤0.015 |
| L390J/X56J | C: ≤0.22, Si: ≤0.45, Mn: 1.40-1.70, P: ≤0.025, S: ≤0.015 |
Mechanical Properties
The mechanical properties of the L245J/BJ, L290J/X42J, L320J/X46J, L360J/X52J, and L390J/X56J carbon welded steel pipes are as follows:
| Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) |
| L245J/BJ | ≥245 | 415-760 | ≥22 |
| L290J/X42J | ≥290 | 415-760 | ≥20 |
| L320J/X46J | ≥320 | 435-760 | ≥18 |
| L360J/X52J | ≥360 | 460-760 | ≥16 |
| L390J/X56J | ≥390 | 490-760 | ≥14 |
Application
The L245J/BJ, L290J/X42J, L320J/X46J, L360J/X52J, and L390J/X56J carbon welded steel pipes specified in GB/T 31937 are primarily used for the construction of pipelines for coal slurry transportation. These pipes are designed to withstand the harsh conditions and high-pressure environments encountered in coal slurry pipelines, ensuring efficient and reliable transportation of coal slurry.
Haiyan Sanxin Steel Pipe Factory is a leading manufacturer of steel pipes in China. Located in a region with excellent geographical advantages, the factory is situated close to the Zhoushan Port and Ningbo Port.
Our factory covers an area of more than 25,000 square meters and has been in the steel pipe manufacturing business for 20 years. Over this period, we have accumulated a wealth of professional experience, which has helped us establish ourselves as a trusted name in the industry.
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