🟦 Product Overview

JIS I Section is manufactured according to JIS G3192, the Japanese standard for hot‑rolled I‑beams. These beams are widely used in Japan, Southeast Asia, and global engineering projects that follow Japanese design specifications.

JIS I‑Beams include standard I‑beam profiles with reliable mechanical performance, excellent weldability, and precise dimensional tolerances. They are commonly used in building structures, industrial frameworks, machinery support systems, and civil engineering applications.

Common material grades include SS400, SM490, and SM520, covering general structural steel and high‑strength welded structural steel.

🟦 Applicable Standards

• JIS G3192 – Dimensions, shape, mass, and permissible variations of hot‑rolled steel sections
• JIS G3101 – Rolled steels for general structure (SS400)
• JIS G3106 – Rolled steels for welded structures (SM490 / SM520)

🟦 Available Grades

• SS400
• SM490A / SM490B / SM490C
• SM520

These grades provide reliable performance for general and high‑strength structural applications.

🟦 Section Types

Standard I‑Beam (I‑Section)

• Traditional Japanese I‑beam
• Balanced structural performance
• Suitable for building and industrial structures

Wide Flange I‑Beam (when applicable)

• Larger flange width
• Improved load distribution
• Used in machinery and equipment structures

🟦 Dimensions Range

Parameter	Range
Height (H)	100–900 mm
Flange Width (B)	55–300 mm
Web Thickness (t1)	4–28 mm
Flange Thickness (t2)	6–50 mm
Length	6 m / 9 m / 12 m / custom
Tolerance	As per JIS G3192

Designation	Unit Weight (kg/m)	H (mm)	B (mm)	t₁ (mm)	t₂ (mm)	r₁ (mm)	r₂ (mm)	Sectional Area (mm² × 10⁻²)
100×75	12.9	100	75	5	8	7	3.5	16.43
125×75	16.1	125	75	5.5	9.5	9	4.5	20.45
150×75	17.1	150	75	5.5	9.5	9	4.5	21.83
150×125	36.2	150	125	8.5	14	13	6.5	46.15
180×100	23.6	180	100	6	10	10	5	33.06
200×100	26.0	200	100	7	10	10	5	33.06
200×150	50.4	200	150	9	16	15	7.5	64.16
250×125	38.3	250	125	7.5	12.5	12	6	48.79
250×125	55.5	250	125	10	19	21	6	70.73
300×150	48.3	300	150	8	13	12	6	61.58
300×150	65.5	300	150	10	18.5	19	9.5	83.47
300×150	76.8	300	150	11.5	22	23	11.5	97.88
300×150	58.5	300	150	9	15	13	6.5	74.58
350×150	87.2	350	150	12	24	25	12.5	111.1
400×150	72.0	400	150	10	18	17	8.5	91.73
400×150	95.8	400	150	12.5	25	27	13.5	122.1
450×175	91.7	450	175	11	20	19	9.5	116.8
450×175	115	450	175	13	26	27	13.5	146.1
600×190	133	600	190	13	25	25	12.5	169.4
600×190	176	600	190	16	35	38	19	224.5

🟦 Mechanical Properties

SS400

Property	Value
Yield Strength	245–275 MPa
Tensile Strength	400–510 MPa
Elongation	≥ 20%

SM490

Property	Value
Yield Strength	≥ 325 MPa
Tensile Strength	490–610 MPa
Elongation	≥ 18%

🟦 Chemical Composition (Typical)

SM490

Element	Max (%)
C	0.20
Mn	1.60
P	0.035
S	0.035
Si	0.55

🟦 Applications

• Building structures
• Industrial steel frameworks
• Machinery and equipment support
• Civil engineering projects
• Infrastructure and plant construction
• Welded structural components

🟦 Why Use JIS I Section

• Standardized Japanese dimensions
• Excellent weldability and fabrication properties
• Reliable mechanical performance
• Suitable for Asian and global EPC projects
• Wide range of sizes and grades

🟦 Why Choose WelSteels

• Full range of JIS G3192 I‑beams
• SS400 / SM490 / SM520 grades available
• CNC cutting, drilling, and fabrication services
• SGS / BV third‑party inspection available
• Export‑grade seaworthy packaging
• Fast delivery from stock and mill production