Famous JIS G 3461 (Latest Version) – Carbon Steel Tubes for Boiler and Heat Exchanger Suppliers, Factory

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Famous JIS G 3461 (Latest Version) – Carbon Steel Tubes for Boiler and Heat Exchanger Suppliers, Factory

Scope Â
JIS G 3461 specifies the requirements for carbon steel tubes used in boilers, heat exchangers, and pressure vessels. These tubes are suitable for high-temperature service.

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Product Description

Ordering Information

When ordering, the following must be specified:

Standard number (JIS G 3461)

Steel grade (e.g., STB340, STB410, STB510)

Dimensions (outer diameter, wall thickness, length)

Test requirements (if additional tests are needed)

Delivery condition (e.g., annealed, normalized)

Special requirements (if any, such as hydrostatic testing or non-destructive testing)

Material Requirements

3.1 Steel Grades and Chemical Composition

STB340, STB410, STB510, etc.

Specifies carbon (C), manganese (Mn), phosphorus (P), sulfur (S), and silicon (Si) content limits.

3.2 Mechanical Properties

Tensile strength, yield strength, and elongation requirements for each grade.

Hardness limits (if applicable).

Manufacturing Process

Tubes are manufactured by seamless or welded processes.

Heat treatment (annealing or normalizing) is required unless otherwise specified.

Test Requirements

5.1 Mandatory Tests

Tensile test (one test per batch)

Flattening test or bend test (for welded tubes)

Hydrostatic test or non-destructive test (NDT) (eddy current, ultrasonic, etc.)

5.2 Optional Tests (upon agreement)

Impact test (for low-temperature applications)

Hardness test

Grain size test

Inspection & Acceptance Criteria

Tubes must meet dimensional tolerances (outer diameter, wall thickness, length).

Surface defects must be within acceptable limits.

Re-testing is allowed if initial tests fail under specified conditions.

Marking & Packaging

Each tube must be marked with:

Manufacturer’s name or trademark

Steel grade

Size

Heat number or lot identification

Packaging must prevent damage during transportation.

Additional Notes

Compliance with JIS G 3461 ensures suitability for high-temperature and pressure applications.

Latest revisions may include updates to testing methods, chemical composition, or mechanical property requirements.

Frequently Asked Questions (FAQ)

What is the primary application of JIS G 3461 tubes?

JIS G 3461 carbon steel tubes are specifically designed for use in boilers and heat exchangers, making them ideal for high-temperature and high-pressure environments.

What are the common steel grades covered under this standard?

The most common grades include STB340, STB410, and STB510, each offering different levels of tensile strength and mechanical properties to suit specific engineering needs.

Are these tubes available in both seamless and welded forms?

Yes, according to JIS G 3461, the tubes can be manufactured using either seamless or electric resistance welded processes.

What kind of heat treatment is required for these tubes?

Tubes are typically required to undergo heat treatment such as annealing or normalizing to ensure they meet the necessary mechanical property standards.

What mandatory tests must the tubes pass?

Every batch must pass tensile tests, flattening or bend tests, and either a hydrostatic test or a non-destructive test (such as ultrasonic or eddy current testing).

Can I request additional testing for my order?

Yes, optional tests such as impact tests for low-temperature use, hardness tests, or grain size tests can be performed upon agreement between the purchaser and the manufacturer.

Product Detail

Famous JIS G 3461 (Latest Version) – Carbon Steel Tubes for Boiler and Heat Exchanger Suppliers, Factory

Product Description

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Famous JIS G 3461 (Latest Version) – Carbon Steel Tubes for Boiler and Heat Exchanger Suppliers, Factory

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