JIS G3458 alloy steel pipes

JIS G3458 Standard is made for heat resistant alloy steel pipes that are used for high temperature conveying fluid pipes for heaters and boiler tubes.

JIS G3458 Grade STPA 22 Carbon Steel Seamless Tubes are also known as mild steel pipes and tubes.

Packing: Bare/bundles/crates/crate protection at the both sides of tubes or as per customers' requirements.

Painting: as requested.

Chemical Composition:

Grade Chemical Composition %
C Si Mn P S Cr Mo
STPA 12 0.10~0.20 0.10~0.50 0.30~0.80 0.035 max. 0.035 max. - 0.45~0.65
STPA 20 0.10~0.20 0.10~0.50 0.30~0.60 0.035 max. 0.035 max. 0.50~0.80 0.45~0.65
STPA 22 0.15max. 0.50 max. 0.30~0.60 0.035 max. 0.035 max. 0.80~1.25 0.45~0.65
STPA 23 0.15max. 0.50~1.00 0.30~0.60 0.030 max. 0.030 max. 1.00~1.50 0.45~0.65
STPA 24 0.15max. 0.50 max. 0.30~0.60 0.030 max. 0.030 max. 1.90~2.60 0.87~1.13
STPA 25 0.15max. 0.50 max. 0.30~0.60 0.030 max. 0.030 max. 4.00~6.00 0.45~0.65
STPA 26 0.15max. 0.25~1.00 0.30~0.60 0.030 max. 0.030 max. 8.00~10.00 0.90~1.10

Mechanical Properties:

Grade Mechanical Properties
Tensile strength Yield point or proof stress Elongation %
kgf/mm2 {N/mm2} kgf/mm2 {N/mm2} No. 11 or No.12 test piece No. 5 test piece No.4 test piece
Longitudinal Transverse Longitudinal Transverse
STPA 12 39{382}min. 21{206} min. 30 min. 25 min. 24 min. 19 min.
STPA 20 42{412}min. 21{206} min. 30 min. 25 min. 24 min. 19 min.
STPA 22 42{412}min. 21{206} min. 30 min. 25 min. 24 min. 19 min.
STPA 23 42{412}min. 21{206} min. 30 min. 25 min. 24 min. 19 min.
STPA 24 42{412}min. 21{206} min. 30 min. 25 min. 24 min. 19 min.
STPA 25 42{412}min. 21{206} min. 30 min. 25 min. 24 min. 19 min.
STPA 26 42{412}min. 21{206} min. 30 min. 25 min. 24 min. 19 min.
JIS G3458 Grade STPA 22 Specification

JIS G3458 Grade STPA 22 Tubes are low-cost Low Carbon Steel Tubes with max 015 % carbon content with combination of 030-060 % manganese easy to form and shape .

These pipes are manufactured as per JIS Specification and commercially referred as cs pipes or ms pipes.

Low Carbon Steel Pipes are not as hard as hig carbon steel pipes,Though carburizing can increase its surface hardness.

The tubes shall be manufactured by seamless process, electric resistance welding process, or butt welding process, and those of other grades shall be manufactured by seamless process or electric resistance welding process. The tube shall be as manufactured or as cold-finished condition, or they shall be subjected to appropriate heat treatment.

The tubes shall be practically straight. and the two ends shall be at right angles to the axis of the tube. The tubes shall be free from defects detrimental to practical use.



Tech & Service of Seamless pipe

Seamless pipes are extensively applied for the nuclear device, gas, petrochemical, ship building and boiler industries. Seamless pipes dominates 65% of market share in Chinese boiler industry.

How to make seamless pipe(seamless pipe process)?
Hot Piercing Workshop
Piercing process
The cross roll piercing and pilger rolling process in the size range from approx. 250 to 660 mm outside diameter.
Precision cold drawn steel tube production process
Pipe weld cracks
often follow different mechanisms can be divided into two types of thermal cracking and cold cracking.
How to calculate a steel pipe and tube theoretic weight
Calculate a steel pipe?
Pipe fittings are necessary to join together pipes, or to change the direction of an existing pipe.
Pipe beveling
Pipe beveling is the process where an angle is formed between the edge of the end of a pipe or tube and a plane perpendicular to the surface.
Steel pipe cutting machine
Pipe cutting
Cutting tools have a grinding wheel piece cutting machine (also known as toothless saw), hand saw, cutter and other hand tools.
Packing the steel pipes
There are probably hundreds of different methods for packing a pipe, and most of them have merit, but there are two principles that are vital for any method.


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