Seamless pipe

Seamless pipe is manufactured by hot-working steel and, if necessary, by subsequently cold finishing the hot-worked tubular product to produce the desired shape, dimensions and properties.

  • carbon steel pipe
  • DIN/EN Steel Pipe
  • JIS seamless pipe
  • pipes by applications

ASTM Seamless pipe —

JIS seamless pipe —

JIS seamless pipe is steel pipe that has been created by JIS and meets certain performance requirements. Manufacturers follow Japan Industrial Standards voluntarily.

JIS seamless pipe

JIS G3429

JIS G3429 standard specifies the seamless steel tubes, hereinafter referred to as the tube used for the manufacture of seamless steel gas cylinders specified in JIS B8230 and JIS B8241.
JIS G3461,G3462
JIS G3461 Standard specifies the carbon steel tubes, hereinafter refered to as the tubes used for exchanger heat
JIS G3454,G3455,G3456
JIS G3454,G3455,G3456 Carbon steel pipes for pressure, high pressure and high temperature service
JIS G3445
JIS G3445 is Japanese Industrial Standard specifies the carbon steel tubes, hereinafter referred to as the “tubes”,
JIS G 3101 SS400
JIS G 3101 SS400 is one of the most commonly used hot rolled general structural steel.

DIN/EN Steel Pipe

German Institute for Standardization (DIN)
DIN 1629 carbon seamless steel pipes

DIN 1629

specifies the Seamless Circular Tubes of Non Alloys Steels with Special Quality Requirements.

EN 10216

for seamless tubes for circular cross section, with specified elevated temperature

EN 10305-1

specifies the technical delivery conditions for seamless cold drawn steel pipe

DIN 17175

mainly produce DIN 17175 ST35.8,DIN 17175 ST45.8, and 10CrMo910 steel pipes.

DIN/EN Steel Pipe


DIN 2391 standard specifies the Seamless steel tubes used forMechanical and Automobile.


suitable for seamless steel tubes for pressure purposes.

Seamless pipes by applications

Boiler tubes

Boiler tubes are tubes used for boiler systems, like boilers for civil use in life, general industrial boilers, locomotive boilers and thermal power boiler.

Heat exchange tubes

Heat exchange tubes are intended for heating or cooling process fluids, they are for example suitable for closed circuit cooling …

Seamless Pipes and Tubes for Pressure Applications

SunnySteel Supply is a leading international supplier of seamless pipes and tubes of all grades and dimensions with more than 10 years of product and business expertise. The EN 10216 Euronorm replaces the old DIN 17175 and DIN 1629standards.

Seamless pipes for high temperature and pressure service

application for heating-pipelines, containers, coal-saving devices superheaters and reheaters of high temperature and high press boiler by the main standard GB5310-2008, GB9948-2006, GB6479-2000, ASTM/ASME A/SA213, ASTM/ASME A/SA335, EN10216-2, ASTM/ASME A/SA312.

Seamless pipes for low and medium pressure service

Seamless steel pipes for low and medium pressure service Appication for heat exchange tubes, streaming tubes. In the main steel grade as GB3087-2008, ASTM A179, ASTM A192.

Seamless steel pipe for ship building usage

Seamless steel tubes for ship-building refer to the ship building steel pipes which are designed and manufactured for boilers,super heaters and pressure systems of ship.

Seamless steel tubes to chemical industry

Low medium tubes are used as the pipes on the heated side of low and medium pressure boilers(normally with operating pressure not higher than 5.88Mpa)

Tubes for Fluid Transportation ServiceTubes for Fluid Transportation Service

Our fluid seamless steel tubes are widely used for fluid transport, water conveying (sewage water discharge, water divert project), oil and natural gas long distance transmission as well as fluids.

Tubes for Heat Exchanger and Condensers

Heat exchange tubes are intended for heating or cooling process fluids, they are for example suitable for closed circuit cooling of electrical equipment using demineralised water and for cooling water soluble oil solutions in quenching tanks.

Tubes for Mechanical and Automobile

Seamless Steel Tubes for Mechanical and Automobile usage for Backbone of Automobile and rear axle tube, manufacturing and processing of precision equipments, instruments and apparatus.