JIS SS400 & SM490 H-Beams: Japanese Standards for Heavy Construction

Our hot-rolled H-beams (also called wide flange beams) are premium structural steel sections designed for superior load-bearing capacity in construction and industrial applications. Manufactured to ASTM A36/A992, GB/T 11263, JIS G3192, and EN 10025 standards, these beams offer excellent strength-to-weight ratio and durability.

H-beam steel is available in a wide range of sizes and dimensions, allowing for flexibility in design and construction. The specific sizes and dimensions of H-beam steel can vary depending on regional standards and manufacturer specifications. However, here are some common H-beam steel sizes and dimensions:

Height (H): The height of an H-beam steel refers to the vertical distance between the top and bottom flanges. Millimeters (mm) or inches (in) are commonly used measurement units.

Flange Width (B): The flange width of an H-beam steel refers to the horizontal width of each flange. Millimeters (mm) or inches (in) are commonly used measurement units.

Web Thickness (t1): The web thickness of an H-beam steel refers to the thickness of the vertical web connecting the two flanges. Millimeters (mm) or inches (in) are commonly used measurement units.

Flange Thickness (t2): The flange thickness of an H-beam steel refers to the thickness of each flange. Millimeters (mm) or inches (in) are commonly used measurement units.

For example, a common H-beam steel size might be denoted as “H-beam 200x200x8x12,” where:

Height (H) = 200 mm

Flange Width (B) = 200 mm

Web Thickness (t1) = 8 mm

Flange Thickness (t2) = 12 mm

This indicates that the H-beam has a height and flange width of 200 mm, a web thickness of 8 mm, and a flange thickness of 12 mm.

H-beam steel standards

Currently, H-beam steel is a product line that includes various types such as H100, H125, H150, H200, H250, H300, H350, H400, and more, which are widely used. Almost all of these are produced to international standards and are extensively used in industrial and construction sectors.

H-beam steel is imported from countries such as Taiwan, Russia, China, Japan, the UK, and the US.

Standards for H-beam steel include: ATSM, DIN, ANSI, EN, GOST 380-88, JIS G3101, SB410, 3010.

Steel grades for H-beam include: S355JO, S275, S275JR, S275JO, S235, S235JR, S235JO, ASTM A36, JIS G3101 SS400, Q345B, A572 Gr50, S355, S355JR.

Russian steel grades for H-beam include: CT3,.. with the standard GOST 380-88.

Japanese steel grades for H-beam include: SS400,.. with the standard SB410, 3010.

Chinese steel grades for H-beam include: SS400, Q345B,… with the standard JIS G3101, SB410, 3010.

US steel grades for H-beam include: A36,.. with the standard ATSM A36.

Choosing the Right Grade

When selecting a steel H-Beam grade, consider the following factors:

Load requirements: Higher strength grades (e.g., Q345, A572) for heavy loads.

Environmental conditions: Stainless steel or galvanized for corrosive environments.

Budget: Carbon steel grades (e.g., Q235, A36) for cost-effective solutions.

For specific standards, H-beam steel includes the parameters:

H: height of the steel column

B: width of the steel flange

t1: thickness of the steel web

t2: thickness of the steel flange

L: length of the steel column

W: steel weight, calculated in Kg/m

H-beam steel dimensions

According to the gathered information, an H-beam steel typically has a length ranging from 6m to 15m. In reality, the product’s lengths are usually around 6m and 12m, with H-beam steel of 12m being the most commonly chosen and prevalent.

For H-beam steel with special dimensions or outside standard regulations, buyers will often negotiate separately with manufacturers. In cases where domestic production of H-beam steel is not possible, importation becomes the solution.

Building Construction

Steel frames for high-rise buildings

Industrial warehouse structures

Roof trusses and support columns

Infrastructure Projects

Bridge girders and supports

Highway overpasses

Railway platforms

Industrial Uses

Heavy equipment bases

Crane runway beams

Offshore platforms

Energy Sector

Power plant structures

Transmission towers

Standard export packing. The modes of transportation include containerized sea freight, bulk sea freight, air freight, land transportation, and multi-modal transportation.

1. What is an H-beam?

An H-beam (or I-beam) is a structural steel component with an "H"-shaped cross-section, designed to provide superior load-bearing capacity in construction and engineering projects.

2. What are the common grades of H-beams?

Popular grades include:

ASTM A36 (General construction, moderate strength)

ASTM A572 Gr.50 (High-strength for bridges & heavy structures)

Q235B / Q355B (Chinese standards for buildings & infrastructure)

S235JR / S355JR (European standards for industrial use)

JIS SS400 / SM490 (Japanese standards for heavy-duty projects)

3. What are the key applications of H-beams?

High-rise buildings (Steel frames, columns, and beams)

Bridges & highways (Long-span support structures)

Industrial warehouses & factories (Heavy-load roofing and flooring)

Shipbuilding & offshore platforms (High-strength structural support)

Railway & infrastructure (Tunnel supports, crane beams)

4. What’s the difference between H-beam and I-beam?

H-beam: Wider flanges, more load-bearing capacity, used in heavy construction.

I-beam: Thinner flanges, lighter weight, used in residential or light commercial projects.

5. How do I choose the right H-beam size?

Key factors:

Load requirements (Heavier loads need larger beams like 400x400mm)

Span length (Longer spans require higher moment of inertia)

Building codes (Check local standards like ASTM, EN, or GB)

6. Can H-beams be welded or drilled?

Yes, but proper techniques are needed:

Pre-heating may be required for thick beams (e.g., S355JR).

Use low-hydrogen electrodes for welding high-strength grades.