JIS G3462

JIS G3462 Steel Pipe

JIS G3462 is a renowned Japanese Industrial Standard that outlines the specifications for alloy steel tubes, specifically designed for high-temperature applications. These tubes are pivotal in industries requiring efficient heat transfer, such as boilers, heat exchangers, and fired heaters. Manufactured using a combination of methods, these tubes are available in several grades, including STBA12, STBA13, STBA20, and STBA22. The U-bend tubes, crafted through the cold-bending process, also adhere to this standard, ensuring reliability and efficiency for our clients.

JIS G3462 Specification

Our JIS G3462 alloy steel tubes range in outside diameter from 15.9 mm to 139.8 mm. These tubes are manufactured either through a seamless process or by electric resistance welding. Specific grades, such as STBA 23 to STBA 26, are exclusively produced using the seamless method. All tubes undergo rigorous heat treatment ensuring their durability and resilience. Clients can also expect plain end finishing on the tube ends unless specified otherwise.

Production Standard	JIS G3462
Manufacturing Processes	ERW (Electric Resistance Welding)
	SMLS (Hot Finished Seamless)
	SMLS (Cold Drawn Seamless)
Outside Diameter	15.9mm – 139.8mm (1/4″ – 5″)
Wall Thickness	1.65mm – 25.4mm
Pipe Length	1.5 – 18 meters
Steel Grade	JIS G3462 STBA12	JIS G3462 STBA23
	JIS G3462 STBA13	JIS G3462 STBA24
	JIS G3462 STBA20	JIS G3462 STBA25
	JIS G3462 STBA22	JIS G3462 STBA26
Corrosion Prevention	Lacquer, Varnish, Oiling, Galvanizing
End Processes	Square Cut, Bevelling, Threading, Grooving
Further Processing	Welding, Bending, Hole Drilling, Punching, Swaging, Tapering, Flaring, Expanding

JIS G3462 Dimension Table

The tubes under the JIS G3462 standard are available in a wide range of dimensions, catering to various industrial needs. With an outside diameter ranging from 15.9 mm to 139.8 mm, our tubes are versatile and adaptable. Whether you require U-bend tubes or straight ones, we ensure that each product meets the exacting standards set by JIS G3462.

Outside Diameter mm	Thickness mm
Outside Diameter mm	1.2	1.6	2.0	2.3	2.6	2.9	3.2	3.5	4.0	4.5	5.0	5.5	6.0	6.5	7.0	8.0	9.5	11.0	12.5
15.9	●	●	●	●	●	●
19.0		●	●	●	●	●
21.7			●	●	●	●	●
25.4			●	●	●	●	●	●
27.2			●	●	●	●	●	●	●
31.8				●	●	●	●	●	●	●
34.0					●	●	●	●	●	●	●
38.1					●	●	●	●	●	●	●	●
42.7					●	●	●	●	●	●	●	●	●
45.0					●	●	●	●	●	●	●	●	●	●
48.6					●	●	●	●	●	●	●	●	●	●	●
50.8					●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
54.0					●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
57.1						●	●	●	●	●	●	●	●	●	●	●	●	●	●
60.3						●	●	●	●	●	●	●	●	●	●	●	●	●	●
63.5						●	●	●	●	●	●	●	●	●	●	●	●	●	●
70.0						●	●	●	●	●	●	●	●	●	●	●	●	●	●
76.2							●	●	●	●	●	●	●	●	●	●	●	●	●
82.6							●	●	●	●	●	●	●	●	●	●	●	●	●
88.9							●	●	●	●	●	●	●	●	●	●	●	●	●
101.6								●	●	●	●	●	●	●	●	●	●	●	●
114.3									●	●	●	●	●	●	●	●	●	●	●
127.0									●	●	●	●	●	●	●	●	●	●	●
139.8												●	●	●	●	●	●	●	●

Chemical Requirements of JIS G3462

Our JIS G3462 tubes are manufactured with precise chemical compositions to ensure their robustness and longevity. Each grade, from STBA12 to STBA26, has specific chemical requirements, ensuring the tubes’ resistance to high temperatures and corrosion. Elements like Carbon, Silicon, Manganese, Phosphorus, Sulfur, Chromium, and Molybdenum are meticulously balanced to provide optimal performance.

Designation of Grade	C	Si	Mn	P	S	Cr	Mo
STBA 12	0.10 to 0.20	0.10 to 0.50	0.30 to 0.80	0.035 max.	0.035 max.	–	0.45 to 0.65
STBA 13	0.15 to 0.25	0.10 to 0.50	0.30 to 0.80	0.035 max.	0.035 max.	–	0.45 to 0.65
STBA 20	0.10 to 0.20	0.10 to 0.50	0.30 to 0.60	0.035 max.	0.035 max.	0.50 to 0.80	0.40 to 0.65
STBA 22	0.15 max.	0.50 max.	0.30 to 0.60	0.035 max.	0.035 max.	0.80 to 1.25	0.45 to 0.65
STBA 23	0.15 max.	0.50 to 1.00	0.30 to 0.60	0.030 max.	0.030 max.	1.00 to 1.50	0.45 to 0.65
STBA 24	0.15 max.	0.50 max.	0.30 to 0.60	0.030 max.	0.030 max.	1.90 to 2.60	0.87 to 1.13
STBA 25	0.15 max.	0.50 max.	0.30 to 0.60	0.030 max.	0.030 max.	4.00 to 6.00	0.45 to 0.65
STBA 26	0.15 max.	0.25 to 1.00	0.30 to 0.60	0.030 max.	0.030 max.	8.00 to 10.00	0.90 to 1.10

Mechanical Requirements of JIS G3462

Mechanical properties are paramount in ensuring the tubes’ resilience under high-temperature conditions. Our tubes, from grades STBA12 to STBA26, meet the stringent tensile property requirements, yield points, and elongation percentages as outlined by the JIS G3462 standard. This ensures that our tubes can withstand the rigors of high-temperature applications.

Designation of Grade	Tensile Strength N/mm2	Yield Point or Proof Stress N/mm2
STBA 12	380 min.	205 min.
STBA 13	410 min.
STBA 20
STBA 22
STBA 23
STBA 24
STBA 25
STBA 26
NOTE：1 N/mm2=1 MPa

Steel Grades in JIS G3462

We offer a diverse range of steel grades under the JIS G3462 standard, including STBA 12, STBA 13, STBA 20, STBA 22, STBA 23, STBA 24, STBA 25, and STBA 26. Each grade is tailored for specific applications and environments, ensuring that our clients receive the best product for their needs.

Production Tolerance of JIS G3462

Table Tolerances on Outside Diameter
Category of outside diameter	Toleranoes on outside diameter
Category of outside diameter	Hot finished seamless steel tube	Cold finished seammless steel pipe	As electric resistance weldedsteel steel tube a)	Cold finished electric resistance welded steel tube
Under 25	+ 0.4 -0.8	±0.10	±0.15	±0.10
25 or over to and excl. 40		±0.15	±0.20	±0.15
40 or over to and excl. 50		±0.20	±0.25	±0.20
50 or over to and excl. 60		±0.25	±0.3	±0.25
60 or over to and excl. 80		±0.3	±0.4	±0.3
80 or over to and excl. 100		±0.4	+0.4 -0.6	±0.4
100 or over to and excl.120	+ 0.4 -1.2	+ 0.4 -0.6	+ 0.4 -0.8	+ 0.4 -0.6
120 or over to and excl.160	+ 0.4 -1.2	+ 0.4 -0.8	+ 0.4 -1.0	+ 0.4 -0.8
160 or over to and excl.200	+ 0.4 -1.8	+ 0.4 -1.2	+ 0.4 -1.2	+ 0.4 -1.2
200 or over	+ 0.4 -2.4	+ 0.4 -1.6	+ 0.4 -1.6	+ 0.4 -1.6

Table Tolerances on wall thickness and wall thickness deviation a)
Tolerance	Wall thickness	Hot fnished seamless steel tube		Cold fnished seamless steel tube		Electric resistance weldedsteel steel tube a)
		Outside diameter mm
		Under 100	100 or over	Under 40	40 or over	Under 40	40 or over
Tolerance on wal lthickness	Under 2	–	–	+0.4mm 0	+22% 0	+0.3mm 0	+18% 0
	2 or over to and excl.2.4	+40% 0	–	+20% 0		+18% 0
	2.4 or over to and excl.3.8	+35% 0	+35% 0
	3.8 or over to and excl.4.6	+33% 0	+33% 0
	4.6 or over	+28% 0	+28% 0
Tolerance on wal lthickness deviation b	5.6 or over	Within 22.8 % of wall thickness		–		–