Name: JIS G3444 Carbon Steel seamless Tubes For General Structural Purpose
Brand: TORICH
Price: 1 USD

TORICH is an enterprise that has been producing precision steel pipes and steel pipe processing for over 20 years, with a factory area of approximately 20000 square meters

The main products produced are carbon steel and alloy steel grade seamless steel pipes, welded precision steel pipes, DOM steel pipes, seamless and welded stainless steel pipes。And our separate workshop also produce machined cast iron parts and cast steel parts, as well ad customized precision parts and difficult precision parts. Our strength is with in our ability to produce metal parts of higher quality control in an integrated process, from mapping and mould design, to casting, forging, machining, heat treatment, surface treatment, assembly and testing.

TORICH team is familiar with the quality requirements and process standards of precision partssteel tubes of leading industrial companies at home and abroad,and management level, and constantly looks for like-minded excellent suppliers, which enable us to reduce the have a comparative advantage over many of our competitors.

In the field of processing, TORICH has 18 sets 4-axis/3-axis CNC machines and over 30 sets of CNC lathers. The machining center is capable of machining 1100x600x800mm parts and the CNC lathes are capable of processing 550x1500mm parts. We specialize in machining stainless steel, alloy steel and other hard metals, as well as carbon steel, aluminium, and copper, with a dimensional accuracy of 0.01mm.

As of 2023, TORICH has perfectly cooperated with more than 50 countries, including Russia, India, Australia, the United Kingdom, France, the United States, Canada, Brazil, and Egypt. Quality and reputation are always our first concerns, with the aim of well serving every customer who trusts in us. TORICH looks forward to partnering with customers all over the world.

Our steel pipes cover the following ranges:
Seamless Precision Steel Pipes
Welded Precision Steel Pipes, with DOM production
Seamless Heat Exchanger Steel Pipe
Seamless Boiler Steel Pipes
Seamless Structural Steel Pipes
Seamless Mechanical Steel Pipes
Seamless Alloy Steel Tubes & Pipes
Seamless Stainless Steel tubes
Welded Stainless Steel Tubes
Seamless Stainless Steel Tubes & Pipes
Welded Stainless Steel Tubes & Pipes
Seamless Carbon Steel Tubes & Pipes
Nickel Alloy Steel Tubes & Pipes

Products Application:
Oil Cylinders
Air Cylinder,
Automotive Cylinder Liners
Boilers, Pressure Vessels
Shell & Heat Exchangers
Jack Lifting
Telescopic Systems
Pneumatic Cylinders
Agricultural Machineries

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Brand Name :	TORICH
Model Number :	JIS G3444
Certification :	CE,BV,ISO9001,API,ISO
Price :	Negotiable
Payment Terms :	L/C, D/A, D/P, T/T, Western Union, MoneyGram
Supply Ability :	60000 Ton/Tons per Year
Delivery Time :	20-40days

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.)

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 %

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

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.

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JIS G3444 Carbon Steel seamless Tubes For General Structural Purpose

JIS G3444 Carbon Steel seamless Tubes For General Structural Purpose

JIS G3444 Carbon Steel seamless Tubes For General Structural Purpose

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

Material Overview

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Chemical Composition

Mechanical Properties

Key Features

Applicable Standards

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JIS G3444 Carbon Steel seamless Tubes For General Structural Purpose

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