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JIS G3463 Stainless Steel Boiler and Heat Exchanger Tubes

Dongmeng Group supplies JIS G3463 stainless steel boiler and heat exchanger tubes for boilers, superheaters, condensers, chemical-processing equipment and petroleum-industry heat-transfer systems.

The tubes are available in seamless and welded manufacturing routes, with multiple austenitic, duplex and ferritic stainless steel grades. We support straight tubes, fixed-length tubes, cold-drawn precision tubes and project-specific U-bent heat exchanger tubes.

JIS G3463 is the Japanese Industrial Standard for stainless steel tubes used to transfer heat between the inside and outside of a tube.

Typical products covered by the standard include:

Boiler superheater tubes

Heat exchanger tubes

Condenser tubes

Catalyser tubes

Tubes used in chemical and petroleum industries

The current revision is JIS G 3463:2023. It is generally applicable to tubes with outside diameters from 15.9 mm to 139.8 mm.

JIS G3463 does not apply to steel tubes specifically intended for fired heaters. Fired-heater tubing should be selected according to the applicable equipment design code and material specification.

The standard itself is generally applied to OD 15.9–139.8 mm. Sizes outside this normal scope should only be quoted after confirming the applicable specification, manufacturing route and buyer acceptance. 

The 2023 standard contains 41 grade symbols covering austenitic, austenitic-ferritic and ferritic stainless steels. Commercial availability varies significantly according to grade, dimensions and manufacturing method.

The grade must be selected using the complete process conditions, including temperature, pressure, fluid chemistry, chloride level, expected corrosion mechanism and welding requirements.

The following table covers the most commonly requested austenitic grades.

 SUS321TB includes titanium stabilization, while SUS347TB uses niobium stabilization. Final chemical acceptance must follow the current standard and the material certificate supplied with the order.

For these common austenitic grades, the minimum elongation generally depends on tube diameter:

OD below 10 mm: minimum 27%

OD from 10 mm to below 20 mm: minimum 30%

OD of 20 mm or above: minimum 35%

Different test-piece requirements apply to thin-wall tubes and certain special alloy groups. Final acceptance must therefore follow the applicable test-piece geometry and current JIS requirements.

TB - Standard Tube Grade

The TB suffix identifies tubing manufactured for boiler and heat exchanger applications under JIS G3463.

Examples include SUS304TB, SUS316TB and SUS321TB.

HTB - High-Temperature Grade

The H designation identifies grades with controlled carbon chemistry and other requirements intended for elevated-temperature service.

Examples include:

SUS304HTB

SUS316HTB

SUS321HTB

SUS347HTB

An H grade should not be substituted for a standard or low-carbon grade without reviewing welding, corrosion and design-code requirements.

LTB - Low-Carbon Grade

The L designation limits carbon content and reduces the risk of chromium-carbide precipitation during welding.

Examples include:

SUS304LTB

SUS316LTB

SUS317LTB

Low-carbon grades are commonly considered for welded heat exchanger assemblies where resistance to intergranular corrosion is important.

JIS G3463 covers several manufacturing routes. The production route should be stated in the quotation and material documentation.

The current standard also requires suitable heat treatment. After heat treatment, pickling or an equivalent treatment is normally used to remove scale. This operation may be omitted when bright heat treatment produces a scale-free surface.

 Manufacturing route selection should be based on the equipment code, tube-sheet design, pressure, corrosion conditions and buyer specification-not only on price.

ASTM A213 applies to seamless ferritic and austenitic boiler, superheater and heat exchanger tubes. ASTM A249 applies to welded austenitic boiler, heat exchanger and condenser tubes. Similar grade names do not make the standards automatically interchangeable because chemistry, dimensions, tolerances, manufacturing and testing requirements can differ.

JIS G3463 tubes can be supplied with inspection according to the standard and the agreed inspection and test plan.

Heat number and grade verification

Chemical composition analysis

Tensile testing

Proof-stress and elongation testing

Flattening testing

Flaring testing

Reverse-flattening testing for applicable welded tubes

Outside-diameter measurement

Wall-thickness measurement

Straightness and length inspection

Visual surface inspection

Hydrostatic or nondestructive leak testing

Austenitic grain-size testing when required

The purchaser may specify hydrostatic testing or nondestructive examination. When the purchaser does not specify one, the manufacturer may select the test method.

Available nondestructive methods include:

Ultrasonic testing according to JIS G0582

Eddy-current testing according to JIS G0583

Project-specific equivalent NDT by agreement

The 2023 standard references UT artificial-defect category UD and eddy-current category EY for the standard acceptance arrangement.

JIS G3463 includes a dedicated normative annex for U-bent tubes.

Dongmeng Group can review U-tube requirements based on:

Straight-leg length

Centre-to-centre distance

Bending radius

Tangent length

Tube OD and wall thickness

Required heat treatment after bending

Ovality tolerance

Wall-thinning limit

Hydrostatic or NDT requirements

Packaging frame design

A drawing or tube bundle schedule should be supplied before quotation.

JIS G3463 stainless steel tubes are commonly specified for:

Boiler superheaters

Heat exchangers

Condensers

Chemical-processing equipment

Petroleum-industry heat exchangers

Catalyser tubes

Steam-generating equipment

Waste-heat recovery equipment

High-temperature process systems

Corrosion-resistant tube bundles

Power-generation auxiliary equipment

Food and pharmaceutical heat exchangers, subject to project requirements

The standard does not cover fired-heater tubes. Material for fired heaters must be specified according to the applicable heater design and pressure-equipment code.

Choose SUS304TB When

The process environment is mildly corrosive and general corrosion resistance, fabrication and cost balance are required.

Choose SUS304HTB When

Elevated-temperature strength is more important and the design specification accepts an H-grade material.

Choose SUS304LTB When

The tube will be extensively welded and low carbon is required to reduce sensitization risk.

Choose SUS316TB or SUS316LTB When

The process fluid contains chlorides or chemicals requiring better pitting resistance than 304. Actual suitability still depends on temperature, concentration, pH and crevice conditions.

Choose SUS321HTB or SUS347HTB When

A stabilized grade is required for welded or elevated-temperature service, subject to the equipment design code.

Choose SUS310 Series When

Higher chromium and nickel content is needed for elevated-temperature oxidation resistance. The allowable temperature must still be confirmed through the applicable design code and operating conditions.

Available documentation can include:

Material Test Certificate

Heat-number list

Chemical composition report

Mechanical test report

Hydrostatic test report

Ultrasonic or eddy-current report

Dimensional inspection report

Heat-treatment record

Surface inspection report

Certificate of Conformity

Packing list

Third-party inspection report

EN 10204 3.1 or project-specific documentation can be arranged when agreed before production.

Typical export packaging includes:

Plastic end caps

Waterproof wrapping

Individual tube sleeves

Steel or wooden support frames

Reinforced wooden cases

Protective separators between tube layers

Heat-number identification

Grade and dimension labels

Customized shipping marks

Heat-number traceability should remain consistent between the tube marking, material certificate, packing list and bundle identification.

Dongmeng Group provides stainless steel tubular-material production, mill coordination, inspection, custom processing and international shipment support.

The company website reports five manufacturing centers, 18 production lines, 10 warehouses and 588 employees. Its manufacturing network includes both seamless and welded steel pipe production capabilities, together with testing and material-inspection support.

Customers can receive:

Seamless and welded JIS tube options

Multiple boiler and heat exchanger grades

Long-length and fixed-length production

U-bending and end processing

Material and heat-number traceability

Hydrostatic and NDT coordination

Third-party inspection support

Customized documentation packages

Export seaworthy packaging

FOB, CFR, CIF and DDP delivery support

Please provide the following information:

JIS grade

Manufacturing route

Outside diameter

Wall thickness

Length

Quantity

Straight or U-bent form

Surface condition

Heat-treatment requirement

Hydrostatic or NDT requirement

Dimensional tolerances

Required documentation

Equipment application

Destination port or delivery address

Company: Dongmeng Group

Email: office@dongmjd.com

Phone / WhatsApp: +86 157 6921 4734

Dongmeng Group currently lists this email and phone number as its official contact details.

What is the latest version of JIS G3463?

The current version is JIS G 3463:2023, revised on December 20, 2023.

Does JIS G3463 cover both seamless and welded tubes?

Yes. It includes seamless, automatic arc-welded, laser-welded and electric-resistance-welded manufacturing methods.

Is JIS G3463 the same as ASTM A213?

No. Both standards cover boiler and heat exchanger tubes, but ASTM A213 applies to seamless tubing and has its own chemistry, heat-treatment, dimensional and testing requirements.

What is the difference between SUS304TB and SUS304HTB?

SUS304HTB has controlled higher carbon content for elevated-temperature performance. SUS304TB is the standard grade for general boiler and heat exchanger service.

What is the difference between SUS316HTB and SUS316LTB?

SUS316HTB contains approximately 0.04–0.10% carbon and is intended for elevated-temperature performance. SUS316LTB limits carbon to 0.030% maximum and is commonly selected for welded corrosion-resistant equipment.

Can JIS G3463 tubes be supplied bright annealed?

Bright heat-treated tubes can be supplied subject to grade, size and manufacturing route. Where bright heat treatment leaves a scale-free surface, pickling may be omitted.

Is every tube hydrostatically tested?

The purchaser may specify hydrostatic testing or nondestructive testing. When no method is specified, the manufacturer may select the applicable option.

Can you provide U-bent tubes?

Yes. U-bent tubes can be reviewed according to the drawing, bend radius, leg length, ovality, wall thinning and testing requirements.

Is JIS G3463 suitable for fired heaters?

No. The standard specifically states that it is not applicable to fired-heater tubes.

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