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JIS G3444 Carbon Steel seamless Tubes For General Structural Purpose

JIS G3444 Carbon Steel seamless Tubes For General Structural Purpose

МОК: 1 тонна
цена: Подлежит обсуждению
Стандартная упаковка: В пучках или в деревянных коробках.
Срок доставки: 20-40 дней
способ оплаты: L/C, D/A, D/P, T/T, Western Union, Moneygram
Пропускная способность: 60000 тонн/тонны в год
Подробная информация
Место происхождения
Чжэцзян/Китай
Фирменное наименование
TORICH
Сертификация
ISO9001 ISO 14001 TS16949
Номер модели
JIS G3444
Оценка:
STK290 STK400 STK490 STK500 STK540
Толщина:
10 - 200 mm
Приложение:
Общая структурная цель
Стандартный:
ASTM,DIN,GB,API,JIS
Сертификация:
CE,BV,ISO9001,API,ISO
Сплав или нет:
Не сплав, это сплав.
Техника:
Холодный, холодный/холодный прокатывание/холодный рисунок/холодный рисунок
Вторичное или нет:
Не вторичные
Форма секции:
Круглый
Внешний диаметр (круглый):
10 - 630 мм
Специальная труба:
Точная цепная стальная трубка
Поверхность:
Требования клиентов
Форма:
Круглая форма
Название продукта:
трубы из стальной стали
Тип:
Безшовная круглая стальная труба
Описание продукта

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 3

 

JIS G3444 Carbon Steel seamless Tubes For General Structural Purpose 4     JIS G3444 Carbon Steel seamless Tubes For General Structural Purpose 5

 

JIS G3444 Carbon Steel seamless Tubes For General Structural Purpose 6

JIS G3444 Carbon Steel seamless Tubes For General Structural Purpose 7

 

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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Подробная информация о продукции
JIS G3444 Carbon Steel seamless Tubes For General Structural Purpose
МОК: 1 тонна
цена: Подлежит обсуждению
Стандартная упаковка: В пучках или в деревянных коробках.
Срок доставки: 20-40 дней
способ оплаты: L/C, D/A, D/P, T/T, Western Union, Moneygram
Пропускная способность: 60000 тонн/тонны в год
Подробная информация
Место происхождения
Чжэцзян/Китай
Фирменное наименование
TORICH
Сертификация
ISO9001 ISO 14001 TS16949
Номер модели
JIS G3444
Оценка:
STK290 STK400 STK490 STK500 STK540
Толщина:
10 - 200 mm
Приложение:
Общая структурная цель
Стандартный:
ASTM,DIN,GB,API,JIS
Сертификация:
CE,BV,ISO9001,API,ISO
Сплав или нет:
Не сплав, это сплав.
Техника:
Холодный, холодный/холодный прокатывание/холодный рисунок/холодный рисунок
Вторичное или нет:
Не вторичные
Форма секции:
Круглый
Внешний диаметр (круглый):
10 - 630 мм
Специальная труба:
Точная цепная стальная трубка
Поверхность:
Требования клиентов
Форма:
Круглая форма
Название продукта:
трубы из стальной стали
Тип:
Безшовная круглая стальная труба
Количество мин заказа:
1 тонна
Цена:
Подлежит обсуждению
Упаковывая детали:
В пучках или в деревянных коробках.
Время доставки:
20-40 дней
Условия оплаты:
L/C, D/A, D/P, T/T, Western Union, Moneygram
Поставка способности:
60000 тонн/тонны в год
Описание продукта

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 3

 

JIS G3444 Carbon Steel seamless Tubes For General Structural Purpose 4     JIS G3444 Carbon Steel seamless Tubes For General Structural Purpose 5

 

JIS G3444 Carbon Steel seamless Tubes For General Structural Purpose 6

JIS G3444 Carbon Steel seamless Tubes For General Structural Purpose 7

 

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.