Description JST is a famous manufacturer of steel pipes. All our products own certifications from world’s three major classification societies including DNV (NORWAY), ABS (U.S.A), and BV (FRANCE). JST line pipes have also passed certification of LR (UK), who is the oldest classification society in the world.


1. DNV ABS LR API line pipes manufactured by JST have reached international standard level.
2. JST has various advanced testing equipment in its professional physical and chemical testing center, such as Germany full spectrum direct reading spectrometer, Japan metallographic microscope, impact testing machine, tensile testing machine, microcomputer control electro-hydraulic servo universal testing machine as well as all kinds of machine tools.
3. The finished products (DNV ABS LR API line pipes) feature smooth surface and no oxide layer, which helps to extend their service life. Micro-oxidation or non-oxidation heat treatment furnace is adopted. After heat treatment in it, no oxide layer is formed on surface of line pipe. This assures high quality steel pipe surface and stable pipe performance.

Authoritative Classification Societies

Det Norske Veritas (DNV), Bureau Veritas (BV) and American Bureau of Shipping (ABS) are three major important classification societies in the world.
1. Founded in 1864, DNV is an authoritative, professional and independent non-profit organization.
2. ABS is a non-government organization who is founded in 1862. ABS devotes itself to serving public interest and customer need. It develops and tests standards for designing, constructing and operating ocean related facilities, which mean to protect human life, possession and nature from being harmed. The outstanding characteristic of ABS is that it launched test business for small and medium-sized combat and auxiliary US navy ships.
3. Lloyd’s Register of Shipping (LR) is the oldest classification society in the world. It is acknowledged as an authoritative organization in global shipping industry. LR also shares reputation in other industries, such as military, engineering, etc.

Established in 1984, Jiangyin Changjiang Steel Tube Making Factory has been engaged in manufacturing tubing and casing for about 30 years. We mainly supply structure pipe, fluid pipe, high pressure boiler pipe, API line pipe, marine pipe, alloy pipe, line pipe, etc. Our DNV ABS LR API line pipes are extensively used in metallurgy, port, ship-breaking, manufacturing, real estate, chemical engineering, transportation and other industries. JST steel pipes are well appreciated for their advanced design, sophisticated manufacturing, excellent quality and full service.

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