JIS G3429 Steel Pipe

JIS G3429 is an important standard issued by the Japanese industry specifically for seamless steel pipes. The steel tubes supplied by Pandapipe are specially designed for high-pressure gas cylinders. This seamless steel pipe is known for its high temperature resistance, high strength and excellent creep strength. You can also check whether the pipe meets the standard by three-way inspection.

JIS G3429 Specification

The JIS G3429 standard has a very comprehensive specification. Pandapipe provides JIS G3429 standard steel pipes with excellent durability and strength, and strict control at every step of the manufacturing process ensures high quality and performance of the pipes. pandapipe, on the other hand, offers you different surface coatings, end types and joint methods to ensure a perfect fit for your project.

Standard	JIS G 3429
Procedure	SMLS
Dimensions	21.3mm – 114.3mm
	3/4″ – 4″
	DN20 – DN100
Thickness	2mm – 40mm
	SCH 5S -SCH XXS
Unit Length	5 – 16 mtrs
Steel Grade	JIS G 3429 STH11	JIS G 3429 STH21
	JIS G 3429 STH12	JIS G 3429 STH22
Surface Coating	Varnishing, Black, Oiling, Hot Dip Galvanizing
End Type	Square cut, Bevelled, Threaded, Grooved
Joint Method	Fitting, Flange, Coupling, Clamp, Pipe Shoulder, Welding
Pipe Machining	Welding, Bending, Hole Drilling, Punching, Swaging, Tapering, Flaring, Expanding

Steel Grades in JIS G3429

We offer JIS G3429 Seamless Steel Tubes in various steel grades, including the widely used STH22 grade.
This medium and low carbon chromium-molybdenum type steel is known for its high strength at high temperatures and excellent creep strength.
This makes it an ideal material for high-pressure gas cylinders used in high-load working environments.
With PandaPipe, you have the flexibility to choose the steel grade that best suits your specific application, ensuring you get a product that meets your unique needs.

Steel Grade	Minimum Tensile Strength (MPa)
JIS G3429 STH11	250
JIS G3429 STH12	275
JIS G3429 STH21	320
JIS G3429 STH22	370

JIS G3429 Dimension Table

The dimensions of our JIS G3429 Seamless Steel Tubes are carefully calibrated to ensure optimal performance.
We offer a wide range of tube sizes, allowing you to select the perfect fit for your high-pressure gas cylinders.
Our tubes are available in various outer diameters, wall thicknesses, and lengths, providing you with the flexibility to choose the best fit for your specific application.
With PandaPipe, you can trust that our dimension table has been meticulously crafted to provide you with tubes that deliver superior performance, longevity, and reliability.

Dimensions

Dimensions shall be conform to the agreement between the purchaser and the manufacturer.

Chemical Composition of JIS G3429

Pandapipe’s seamless steel pipes meet the highest standards of JIS G3429. Made of low carbon chromium molybdenum steel, it has the advantages of high strength and high creep strength. This material composition ensures that the pipes produced can withstand high temperatures and pressures, making them ideal for use in high-load working environments.

Chemical Composition Unit:%
Symbol of Grade	C	Si	Mn	P	S	Ni	Cr	Mo
STH11	0.5 max.	0.10 to 0.35	0.18 max.	0.035 max.	0.035 max.	a)	a)	a)
STH12	0.30 to 0.41	0.10 to 0.35	1.35 to 1.70	0.030 max.	0.030 max.	a)	a)	a)
STH21	0.25 to 0.35	0.15 to 0.35	0.40 to 0.90	0.030 max.	0.030 max.	0.25 max.	0.80 to 1.20	0.15 to 0.30
STH22	0.33 to 0.38	0.15 to 0.35	0.40 to 0.90	0.030 max.	0.030 max.	0.25 max.	0.80 to 1.20	0.15 to 0.30
STH31	0.35 to 0.40	0.10 to 0.50	1.20 to 1.50	0.030 max.	0.030 max.	0.50 to 1.00	0.30 to 0.60	0.15 to 0.25
Alloy elements other than those in this table may be added as required. Note a) Ni,Cr or Mo, when added as necessary，shall not be added to such a degree that the specified values of another grade are satisfied，marking the grade no longer discernible.

Mechanical Requirements of JIS G3429

The mechanical properties table of JIS G3429 standard steel pipe covers parameters such as tensile strength, yield strength and elongation. And the hydraulic test, non-destructive testing and other strict testing and verification, to ensure that the pipe can withstand 5 MPa hydraulic pressure without leakage. In line with Japanese industrial standards. Improve your operational efficiency and reliability.

Hydraulic test characteristics：

Tubes shall withstand the applied hydraulic pressure of 5 MPa without leakage.

Nondestructive examination characteristic:

Tubes shall be examined by either of ultrasonic flaw detection or eddy current flaw detection, and there shall be no signal at least equal to that from the artificial defects of the reference test piece of working sensitivity division UD of JIS G 0582 or working sensitivity division EY of JIS G 0583.

Other nondestructive examinations in place of the ultrasonic flaw detection or eddy current flaw detection may be applied upon the agreement between the purchaser and the manufacturer.

JIS G3429 Production Tolerance

JIS G3429 standard production tolerances include outer diameter tolerances, wall thickness tolerances, wall thickness difference tolerances and length tolerances. The tolerance range is strictly controlled to ensure the stability and reliability of the steel pipe in practical applications.

Tolerance on outside diameter	Tolerance on wall thickness	Tolerance on wall thickness disparity	Tolerance on length
1%	+30%	Within 20% of the nominal wall thickness	>+30mm -0

Application of JIS G3429

Boilers and pressure vessels: JIS G3429 Grades STH12, STH21 and STH22 are designed to withstand high temperature and pressure environments in boilers and pressure vessels.
Aerospace: Commonly used in the manufacture of aircraft structural parts, rocket engines and other key components in high-end aerospace equipment.
Automotive industry: With its excellent toughness and strength, it is often used in the manufacture of automotive structural parts, suspension systems and drive shafts.

Chemical Composition Unit:%
Symbol of Grade	C	Si	Mn	P	S	Ni	Cr	Mo
STH11	0.5 max.	0.10 to 0.35	0.18 max.	0.035 max.	0.035 max.	a)	a)	a)
STH12	0.30 to 0.41	0.10 to 0.35	1.35 to 1.70	0.030 max.	0.030 max.	a)	a)	a)
STH21	0.25 to 0.35	0.15 to 0.35	0.40 to 0.90	0.030 max.	0.030 max.	0.25 max.	0.80 to 1.20	0.15 to 0.30
STH22	0.33 to 0.38	0.15 to 0.35	0.40 to 0.90	0.030 max.	0.030 max.	0.25 max.	0.80 to 1.20	0.15 to 0.30
STH31	0.35 to 0.40	0.10 to 0.50	1.20 to 1.50	0.030 max.	0.030 max.	0.50 to 1.00	0.30 to 0.60	0.15 to 0.25
Alloy elements other than those in this table may be added as required. Note a) Ni,Cr or Mo, when added as necessary，shall not be added to such a degree that the specified values of another grade are satisfied，marking the grade no longer discernible.

JIS G3429 Steel Pipe