JIS G3462 Steel Tube is a premium alloy steel tube designed for high-temperature applications, such as boilers, heat exchangers, and fired heaters. Conforming to the Japanese Industrial Standard (JIS), this specification ensures exceptional performance in boiler pipeline protection and heat exchanger systems. Available in grades such as STBA12, STBA13, STBA20, STBA22, STBA23, STBA24, STBA25, and STBA26, these tubes are engineered for efficient heat transfer and corrosion resistance in industries like petroleum, chemical engineering, and power generation.

Manufactured using seamless or electric resistance welding (ERW) processes, JIS G3462 Alloy Steel Tubes are available in outer diameters ranging from 15.9 mm to 139.8 mm and wall thicknesses from 2.0 mm to 14 mm. The tubes are typically supplied in lengths up to 19 meters, with customizable options for specific project needs. The seamless construction of grades STBA23 to STBA26 ensures enhanced durability, while ERW options provide cost-effective solutions for less demanding applications. These tubes undergo rigorous heat treatment processes, such as full annealing, isothermal annealing, or normalizing and tempering, to achieve optimal mechanical properties and high-temperature resistance.

The alloy composition, incorporating elements like chromium and molybdenum, enhances the tubes' resistance to oxidation, creep, and corrosion, making them ideal for handling corrosive fluids and gases in petrochemical plants and power stations. For instance, STBA26, a chromium-molybdenum alloy, offers excellent thermal conductivity and stability under ultra-high critical pressure, making it a preferred choice for boiler superheater and reheater pipes. The tubes are tested for tensile strength, flattening, hardness, and hydrostatic properties to ensure compliance with JIS G3462 standards, with a minimum tensile strength of 380 MPa for STBA12 and up to 410 MPa for STBA22.

JIS G3462 Steel Tubes are versatile, supporting applications such as water tubes, smoke tubes, superheater tubes, and air preheater tubes in boilers, as well as condenser and catalyst tubes in chemical and petroleum industries. Their ability to withstand temperatures up to 600°C and resist pipeline wear makes them indispensable for high-pressure and subcritical power station environments. Surface treatments like galvanizing, varnishing, or 3LPE coatings further enhance durability, while plain or beveled ends facilitate easy installation and integration into complex piping systems.

Compared to other standards like ASTM A335 or DIN 17175, JIS G3462 offers similar high-temperature performance with precise dimensional tolerances and customizable fabrication options, such as cutting, welding, or bending, to meet specific project requirements. The standard excludes tubes for low-temperature heat exchangers or heating furnaces, focusing solely on high-temperature applications. With advanced rolling technology, manufacturers like Sunny Steel ensure minimal dimensional deviations, delivering reliable and high-quality industrial piping solutions.

Comparison of JIS G3462 with ASTM A335 and DIN 17175
Feature	JIS G3462	ASTM A335	DIN 17175
Material Type	Alloy Steel	Ferritic Alloy Steel	Seamless Steel
Temperature Range	Up to 600°C	Up to 650°C	Up to 600°C
Tensile Strength (MPa)	≥380 (STBA12), ≥410 (STBA22/STBA26)	≥415 (P11), ≥415 (P22)	≥410 (13CrMo44)
Yield Strength (MPa)	≥205	≥205 (P11), ≥205 (P22)	≥220 (13CrMo44)
Corrosion Resistance	High (Cr-Mo alloys)	High (Cr-Mo alloys)	Moderate to High
Dimensional Tolerances	OD: ±0.5–1%, WT: ±10–12.5%	OD: ±1%, WT: +22% / -12.5%	OD: ±0.75–1%, WT: ±10–15%
Fabrication Options	Cutting, welding, bending	Cutting, welding, bending	Cutting, welding, bending
Applications	Boilers, heat exchangers, petrochemical	Power plants, refineries, petrochemical	Boilers, high-pressure piping
Key Advantage	Tight dimensional tolerances	Wide range of grades	Robust high-temperature performance
Low-Temperature Suitability	Not suitable	Not suitable	Not suitable

Normative References

The following standards contain provisions which, through reference in this text, constitute provisions of this Standard. The most recent editions of the standards (including amendments) indicated below shall be applied.

JIS G 0320: Standard test method for heat analysis of steel products
JIS G 0321: Product analysis and its tolerance for wrought steel
JIS G 0404: Steel and steel products - General technical delivery requirements
JIS G 0415: Steel and steel products - Inspection documents
JIS G 0416: Steel and steel products - Location and preparation of samples and test pieces for mechanical testing
JIS G 0567: Method of elevated temperature tensile test for steels and heat-resisting alloys
JIS G 0582: Automated ultrasonic examination of steel pipes and tubes
JIS G 0583: Automated eddy current examination of steel pipes and tubes
JIS Z 2241: Metallic materials - Tensile testing - Method of test at room temperature
JIS Z 2245: Rockwell hardness test - Test method
JIS Z 8401: Guide to the rounding of numbers

Key Benefits

Corrosion Resistance

Chromium and molybdenum alloys provide superior resistance to corrosion in harsh industrial environments.

High-Temperature Resistance

Withstands temperatures up to 600°C, ideal for boiler and heat exchanger applications.

Efficient Heat Transfer

Optimized design ensures effective heat exchange in superheater and reheater systems.

Versatile Fabrication

Supports cutting, welding, and bending for customized piping solutions.

Cost-Effective Durability

Robust construction reduces maintenance and replacement costs in high-pressure systems.

Reliable Performance

Meets JIS G3462 standards with rigorous testing for tensile strength and durability.

Technical Specifications

Chemical Composition of JIS G3462 Alloy Steel Tubes
Grade	C (%)	Si (%)	Mn (%)	P (% max)	S (% max)	Cr (%)	Mo (%)
STBA12	0.10-0.20	0.10-0.50	0.30-0.80	0.035	0.035	-	0.45-0.65
STBA22	0.15 max	0.50 max	0.30-0.60	0.035	0.035	0.80-1.25	0.45-0.65
STBA26	0.15 max	0.25-1.00	0.30-0.60	0.030	0.030	8.00-10.00	0.90-1.10

Mechanical Properties of JIS G3462 Alloy Steel Tubes
Grade	Tensile Strength (MPa min)	Yield Strength (MPa min)	Elongation (% min)
STBA12	380	205	30
STBA22	410	205	30
STBA26	410	205	22

Cross-Reference of Steel Tube Grades Across International Standards
KS		ASTM		JIS		DIN		BS
Grade number	Grade	Grade number	GRADE	Grade number	Grade	Grade number	Grade	Grade number
D 3572	STHA12	A161	T1	JIS G3462	STBA12	17175	15Mo 3	-
D 3572	STHA12	A209	T1		STBA12	17175	15Mo 3	-
STHA13	A209	T1a	STBA13		-	-	-	-
STHA20	A213	T2	STBA20		-	-	-	-
STHA22	A213	T12	STBA22		17175	13Cr Mo 44	3059	S1 620
								S2 620
								ERW620
								CEW620
STHA23	A199	T11	STBA23		-	-	-	-
	A200	T11
	A213	T11
STHA24	A199	T22	STBA24		17175	10Cr Mo910	3059	S1 622-440
	A200	T22						S2 622-440
	A213	T22						S2 622-440
STHA25	A199	T5	STBA25		-	-	-	-
	A200	T5
	A210	T5
STHA26	A199	T9	STBA26		-	-	-	-
	A200	T9
	A213	T9

JIS G3462 Heat Treatment Requirements by Steel Tube Class
Symbol of Class	JIS G3462 Heat Treatment
STBA 12 STBA 13	Low temperature annealing, isothermal annealing, full annealing, normalizing or normalizing followed by tempering
STBA 20 STBA22	Low temperature annealing, isothermal annealing, full annealing, normalizing or normalizing followed by tempering
STBA23 STBA 24 STBA 25 STBA 26	Isothermal annealing, full annealing or normalizing followed by tempering

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Standards and Specifications

• JIS G3461 carbon steel tubes specifications
• JIS G3461 STB 410 seamless boiler tubes
• JIS G3461 STB 340 heat exchanger standards
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Dimensions and Customization

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Note: JIS G3461 covers seamless and welded carbon steel tubes for boiler and heat exchanger applications up to 350°C. For detailed specifications, refer to the JIS G3461 standard or contact a certified supplier.

JIS G3462 specifies seamless and electric resistance welded alloy steel tubes for boilers and heat exchangers, designed for high-temperature applications up to 600°C in power plants, petrochemical, and chemical industries.

JIS G3462 includes alloy steel grades STBA12, STBA13, STBA20, STBA22, STBA23, STBA24, STBA25, and STBA26, tailored for high-temperature and corrosion-resistant boiler and heat exchanger applications.

- STBA12: C 0.10–0.20%, Si 0.10–0.50%, Mn 0.30–0.80%, P ≤0.035%, S ≤0.035%, Mo 0.45–0.65%
- STBA22: C ≤0.15%, Si ≤0.50%, Mn 0.30–0.60%, P ≤0.035%, S ≤0.035%, Cr 0.80–1.25%, Mo 0.45–0.65%
- STBA26: C ≤0.15%, Si 0.25–1.00%, Mn 0.30–0.60%, P ≤0.030%, S ≤0.030%, Cr 8.00–10.00%, Mo 0.90–1.10%

- STBA12: Tensile 380 MPa min, Yield 205 MPa min, Elongation 30% min
- STBA22: Tensile 410 MPa min, Yield 205 MPa min, Elongation 30% min
- STBA26: Tensile 410 MPa min, Yield 205 MPa min, Elongation 22% min

OD ranges from 15.9–139.8 mm; WT 2.0–14 mm; lengths typically 5–19 m, customizable. Tolerances: OD ±0.5–1%, WT ±10–12.5%.

Produced via hot-rolling, cold-drawing, or electric resistance welding; heat-treated by full annealing, isothermal annealing, or normalizing and tempering for optimal performance.

Includes tensile, flattening, hardness, hydrostatic, and non-destructive tests (e.g., ultrasonic, eddy current) to ensure quality and compliance with JIS G3462 standards.

Used in boilers (water, smoke, superheater, air preheater tubes), heat exchangers (condenser, catalyst tubes), and high-pressure piping in power generation and petrochemical industries.

Marked with standard, grade, OD×WT, heat number, and manufacturer ID. Orders specify standard, grade, dimensions, length, surface treatment, and test certificates.

Common equivalents include:
- STBA22 ≈ ASTM A213 T22
- STBA23 ≈ ASTM A213 T23
- STBA26 ≈ ASTM A213 T91

JIS G3462 Alloy Steel Tubes

JIS G3462 Alloy Steel Tubes

Normative References