6MnDG Low-Temperature Pipe, also known as 16MnDG Seamless Steel Pipe, is a seamless steel pipe specifically designed for low-temperature environments, particularly suitable for low-temperature pressure vessels and pipeline systems. Below is a detailed introduction to the 16MnDG Low-Temperature Pipe:

I. Basic Overview

Product Type: Seamless Steel Pipe.

Standard: GB/T 18984-2016 (China National Standard), ASTM A333 (American Society for Testing and Materials standard).

Section II: Main Applications

Applicable to low-temperature pressure vessel pipelines and heat exchanger pipelines rated for -45℃ to 195℃.

● In the oil industry, pipeline systems for transporting low-temperature oil and natural gas, particularly in cold regions or the development of offshore oil and gas fields.

● In the chemical industry, used for the transportation and storage of low-temperature chemical media, such as liquid oxygen.

For the manufacturing and maintenance of low-temperature energy equipment in the energy industry, such as liquefied natural gas (LNG) tanks and low-temperature refrigeration systems.

III. Chemical Composition and Mechanical Properties

Chemical Composition: The chemical composition of 16MnDG seamless steel pipes must meet specific standards, such as carbon (C) content between 0.12%~0.20%, silicon (Si) content between 0.20%~0.55%, manganese (Mn) content between 1.20%~1.60%, while strictly controlling the phosphorus (P) and sulfur (S) content to ensure the corrosion resistance and mechanical properties of the pipes.

● Mechanical Properties: Tensile strength is 490~665MPa, yield strength ≥325MPa, elongation ≥30% (along the longitudinal direction). These mechanical property parameters may vary depending on the specific grade or production batch; the specific values should be referred to in the product quality certificate.

4. Specifications, Dimensions, and Production Methods

● Specification Dimensions: The outer diameter range of 16MnDG seamless steel pipes is generally 21mm to 762mm (also said to be 484-57mm), and the wall thickness range is generally 3.0mm to 130mm (also said to be 3.5-45mm).

● Production Methods: Hot rolling, cold drawing, hot expansion, etc.

V. Delivery Status and Testing Requirements

● Delivery Status: In the heat treatment process. Steel pipes should undergo liquid pressure tests individually, with a test pressure of 10MPa and a holding time of not less than 5 seconds. No leakage is allowed in the steel pipes.

● Test Requirements: The low impact test temperature for 16MnDG seamless steel tubes is -45°C.

Section 6: Features and Advantages

● Excellent low-temperature toughness: 16MnDG seamless steel tubes maintain material integrity and performance in extreme cold conditions.

● Excellent corrosion resistance: Strict control of chemical composition and production process ensures the corrosion resistance of the steel pipe.

● Wide Application Range: Due to its excellent mechanical properties and corrosion resistance, 16MnDG seamless steel pipes are widely used in low-temperature pipeline systems in the petrochemical, energy, and other industries.