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.