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JIS G3444 Carbon Steel seamless Tubes For General Structural Purpose

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JIS G3444 Carbon Steel seamless Tubes For General Structural Purpose

MOQ:	1 Ton
Price:	Negotiable
Standard Packaging:	In bundles or in wooden boxes.
Delivery Period:	20-40days
Payment Method:	L/C, D/A, D/P, T/T, Western Union, MoneyGram
Supply Capacity:	60000 Ton/Tons per Year

Details Information

Product Description

Detail Information

Place of Origin

Zhejiang/China

Brand Name

TORICH

Certification

ISO9001 ISO 14001 TS16949

Model Number

JIS G3444

Grade:

STK290 STK400 STK490 STK500 STK540

Thickness:

10 - 200 Mm

Application:

General Structural Purpose

Standard:

ASTM,DIN,GB,API,JIS

Certification:

CE,BV,ISO9001,API,ISO

Alloy Or Not:

Non-alloy,Is Alloy

Technique:

Cold Drawn,Cold Drawn/Cold Rolling/Cold Drawn-honed/Cold Drawn-roll

Secondary Or Not:

Non-secondary

Section Shape:

Round

Outer Diameter(round):

10 - 630 Mm

Special Pipe:

Precision Seamless Steel Tube

Surface:

Customers't Requirement

Shape:

Round Shape

Product Name:

Seamless Steel Pipe

Type:

Seamless Round Steel Pipe

Product Description

JIS G3444 Carbon Steel seamless Tubes For General Structural Purpose 0

JIS G3444 Carbon Steel Seamless Tubes (STK290 / STK400 / STK490 / STK500 / STK540) for General Structural Purpose

Material Overview

These are carbon steel seamless or welded tubes conforming to Japanese Industrial Standard JIS G3444. They are designed for general structural use: civil engineering, architecture, piles, frameworks, etc. The grades STK290, STK400, STK490, STK500, STK540 denote different strength levels.

Specification

Property	Details
Standard	JIS G3444 (e.g. version 2006 / 2021)
Grades	STK290, STK400, STK490, STK500, STK540
Forms	Seamless, Electric Resistance Welded (ERW), Automatic Arc Welded, Butt Welded
Outer Diameter Range	~21.7 mm to 1016.0 mm
Wall Thickness Range	~2.0 mm to ~22 mm (depending on OD etc.)

Chemical Composition

Grade	C (max)	Si (max)	Mn (max) / range	P (max)	S (max)
STK290	–	–	–	0.050 %	0.050 %
STK400	0.25 %	–	–	0.040 %	0.040 %
STK490	0.18 %	0.55 %	1.65 %	0.035 %	0.035 %
STK500	0.24 %	0.35 %	0.30 ‒ 1.30 %	0.040 %	0.040 %
STK540	0.23 %	0.55 %	1.50 %	0.040 %	0.040 %

Mechanical Properties

Here are the mechanical property minima required by the standard for the different grades. This covers tensile strength, yield or proof stress, weld-zone tensile strength, bending & flattening tests. Elongation also specified.

Grade	Tensile Strength, min (Rm) [N/mm²]	Yield Point / Proof Stress, min [N/mm²]	Weld Tensile Strength, min [N/mm²]	Elongation, min %	Flattening / Bend Tests
STK290	290	—	290	30 % (Seamless & Butt welded) / 30 % (ERW etc.) / smaller reductions for larger OD or other methods	Flattening: distance between flat plates = 2/3 D; Bend: 90° bend, inside radius = 6D
STK400	400	235	400	~23 % for most tube manufacturing; lower for certain large diameters or weld types	Flattening: 2⁄3 D; Bend: 90°, 6D
STK490	490	315	490	~23 % or similar; reduced in certain test piece directions or larger ODs	Flattening: 7⁄8 D; Bend: 90°, 6D
STK500	500	355	500	somewhat lower elongation (~15-18 %) for larger tubes or more highly worked materials; see standard	Flattening: 7⁄8 D; Bend: 90°, 8D
STK540	540	390	540	similar to STK500, depending on OD and method; elongation tends to drop somewhat with the higher strength grades	Flattening: 7⁄8 D; Bend: 90°, 8D

Key Features

Graded Strength Levels: Users can select the grade according to structural needs— from basic strength (STK290) to high strength (STK540).
Versatility in Manufacturing: Available seamless or welded, with finishing options. Allows adaptation to application demands and cost/performance trade-offs.
Good Ductility / Toughness especially in lower grades—ensures resistance to brittle failure, suitable for bending, welding, fabrication.
Rigorous Quality Tests: Flattening, bend tests, weld tensile strength etc. help ensure integrity.
Dimensional & Tolerance Standards ensure interchangeability and predictable behavior.

Applicable Standards

JIS G3444 itself is the primary executing standard.
Related standards for chemical analyses and finished product analysis: JIS G0320 (heat / melt analysis), JIS G0321 (product analysis)
Mechanical test method standards cited or used in conjunction: flattening test, bending test, tensile test etc. (within JIS G3444).

Application Domains

Domain	Specific Uses
Civil Engineering & Construction	Support columns, beams, frameworks, building facades, scaffolding, footings, piles for foundations, retaining structures, structural bracing.
Infrastructure	Piles for bridges, piles for landslide suppression, retaining walls, utility structures.
Architectural Structures	Towers, handrails, perimeter fences, decorative structures where structural load + aesthetic finish needed.
Industrial Buildings / Equipment	Frameworks, supports for equipment, overhead structures, racks, platforms.
Temporary / Modular Structures	Scaffolding systems, temporary shelters, shipping container adaptations.

JIS G3444 Carbon Steel seamless Tubes For General Structural Purpose 1

JIS G3444 Carbon Steel seamless Tubes For General Structural Purpose 2

JIS G3444 Carbon Steel seamless Tubes For General Structural Purpose 4

JIS G3444 Carbon Steel seamless Tubes For General Structural Purpose 6

Q: Are you trading company or manufacturer ?

A: manufacturer,also can do trading.

Q: How long is your delivery time?

A: Generally speaking,it is 10-15 days if the goods are in stock,or it is 30-40 days if the goods are not in stock, it is according to quantity.

Q: Do you provide samples? is it free or extra ?

A: Yes, we could offer the sample for free charge but need pay the cost of freight.

Q: What is your terms of payment ?

A: Payment<=2000USD, 100% in advance. Payment>=2000USD, 30% T/T in advance ,balance before shippment.

If you have another question, pls feel free to contact with me.

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JIS G3444 Carbon Steel seamless Tubes For General Structural Purpose

MOQ:	1 Ton
Price:	Negotiable
Standard Packaging:	In bundles or in wooden boxes.
Delivery Period:	20-40days
Payment Method:	L/C, D/A, D/P, T/T, Western Union, MoneyGram
Supply Capacity:	60000 Ton/Tons per Year

Detail Information

Product Description

Detail Information

Place of Origin

Zhejiang/China

Brand Name

TORICH

Certification

ISO9001 ISO 14001 TS16949

Model Number

JIS G3444

Grade:

STK290 STK400 STK490 STK500 STK540

Thickness:

10 - 200 Mm

Application:

General Structural Purpose

Standard:

ASTM,DIN,GB,API,JIS

Certification:

CE,BV,ISO9001,API,ISO

Alloy Or Not:

Non-alloy,Is Alloy

Technique:

Cold Drawn,Cold Drawn/Cold Rolling/Cold Drawn-honed/Cold Drawn-roll

Secondary Or Not:

Non-secondary

Section Shape:

Round

Outer Diameter(round):

10 - 630 Mm

Special Pipe:

Precision Seamless Steel Tube

Surface:

Customers't Requirement

Shape:

Round Shape

Product Name:

Seamless Steel Pipe

Type:

Seamless Round Steel Pipe

Minimum Order Quantity:

1 Ton

Price:

Negotiable

Packaging Details:

In bundles or in wooden boxes.

Delivery Time:

20-40days

Payment Terms:

L/C, D/A, D/P, T/T, Western Union, MoneyGram

Supply Ability:

60000 Ton/Tons per Year

Product Description

JIS G3444 Carbon Steel seamless Tubes For General Structural Purpose 0

JIS G3444 Carbon Steel Seamless Tubes (STK290 / STK400 / STK490 / STK500 / STK540) for General Structural Purpose

Material Overview

Specification

Property	Details
Standard	JIS G3444 (e.g. version 2006 / 2021)
Grades	STK290, STK400, STK490, STK500, STK540
Forms	Seamless, Electric Resistance Welded (ERW), Automatic Arc Welded, Butt Welded
Outer Diameter Range	~21.7 mm to 1016.0 mm
Wall Thickness Range	~2.0 mm to ~22 mm (depending on OD etc.)

Chemical Composition

Grade	C (max)	Si (max)	Mn (max) / range	P (max)	S (max)
STK290	–	–	–	0.050 %	0.050 %
STK400	0.25 %	–	–	0.040 %	0.040 %
STK490	0.18 %	0.55 %	1.65 %	0.035 %	0.035 %
STK500	0.24 %	0.35 %	0.30 ‒ 1.30 %	0.040 %	0.040 %
STK540	0.23 %	0.55 %	1.50 %	0.040 %	0.040 %

Mechanical Properties

Grade	Tensile Strength, min (Rm) [N/mm²]	Yield Point / Proof Stress, min [N/mm²]	Weld Tensile Strength, min [N/mm²]	Elongation, min %	Flattening / Bend Tests
STK290	290	—	290	30 % (Seamless & Butt welded) / 30 % (ERW etc.) / smaller reductions for larger OD or other methods	Flattening: distance between flat plates = 2/3 D; Bend: 90° bend, inside radius = 6D
STK400	400	235	400	~23 % for most tube manufacturing; lower for certain large diameters or weld types	Flattening: 2⁄3 D; Bend: 90°, 6D
STK490	490	315	490	~23 % or similar; reduced in certain test piece directions or larger ODs	Flattening: 7⁄8 D; Bend: 90°, 6D
STK500	500	355	500	somewhat lower elongation (~15-18 %) for larger tubes or more highly worked materials; see standard	Flattening: 7⁄8 D; Bend: 90°, 8D
STK540	540	390	540	similar to STK500, depending on OD and method; elongation tends to drop somewhat with the higher strength grades	Flattening: 7⁄8 D; Bend: 90°, 8D

Key Features

Graded Strength Levels: Users can select the grade according to structural needs— from basic strength (STK290) to high strength (STK540).
Versatility in Manufacturing: Available seamless or welded, with finishing options. Allows adaptation to application demands and cost/performance trade-offs.
Good Ductility / Toughness especially in lower grades—ensures resistance to brittle failure, suitable for bending, welding, fabrication.
Rigorous Quality Tests: Flattening, bend tests, weld tensile strength etc. help ensure integrity.
Dimensional & Tolerance Standards ensure interchangeability and predictable behavior.

Applicable Standards

JIS G3444 itself is the primary executing standard.
Related standards for chemical analyses and finished product analysis: JIS G0320 (heat / melt analysis), JIS G0321 (product analysis)
Mechanical test method standards cited or used in conjunction: flattening test, bending test, tensile test etc. (within JIS G3444).

Application Domains

Domain	Specific Uses
Civil Engineering & Construction	Support columns, beams, frameworks, building facades, scaffolding, footings, piles for foundations, retaining structures, structural bracing.
Infrastructure	Piles for bridges, piles for landslide suppression, retaining walls, utility structures.
Architectural Structures	Towers, handrails, perimeter fences, decorative structures where structural load + aesthetic finish needed.
Industrial Buildings / Equipment	Frameworks, supports for equipment, overhead structures, racks, platforms.
Temporary / Modular Structures	Scaffolding systems, temporary shelters, shipping container adaptations.

JIS G3444 Carbon Steel seamless Tubes For General Structural Purpose 1

JIS G3444 Carbon Steel seamless Tubes For General Structural Purpose 2

JIS G3444 Carbon Steel seamless Tubes For General Structural Purpose 4

JIS G3444 Carbon Steel seamless Tubes For General Structural Purpose 6

Q: Are you trading company or manufacturer ?

A: manufacturer,also can do trading.

Q: How long is your delivery time?

A: Generally speaking,it is 10-15 days if the goods are in stock,or it is 30-40 days if the goods are not in stock, it is according to quantity.

Q: Do you provide samples? is it free or extra ?

A: Yes, we could offer the sample for free charge but need pay the cost of freight.

Q: What is your terms of payment ?

A: Payment<=2000USD, 100% in advance. Payment>=2000USD, 30% T/T in advance ,balance before shippment.

If you have another question, pls feel free to contact with me.

Tags: