Facebook Youtube Linkedin Reddit Instagram

Welcome to ALLLAND Steel Pipe Co., Ltd.

sales@alllandsteel.com

Русский язык

ALLLAND JIS G3444 STK490 Pipe Supply

JIS G3444 STK490

JIS G3444 STK490 is a high-strength carbon steel pipe grade specified in the Japanese Industrial Standard JIS G3444 – Carbon Steel Tubes for General Structural Purposes. Compared with standard structural steel grades such as STK400, STK490 offers higher tensile strength and load-bearing capacity, making it suitable for demanding structural applications. As a professional steel pipe manufacturer, ALLLAND Steel supplies JIS G3444 STK490 structural steel pipes in various sizes, wall thicknesses, and surface treatments, with strict quality control throughout production to meet international project requirements.

  • O.D. 21.7 mm – 508.0 mm
  • W.T. 2.0 mm – 22.0 mm
  • Length 4 m – 12 m (Custom Length Available)
  • Process: ERW (Electric Resistance Welded), Seamless
REQUEST A QUOTE

Alllandsteel is a steel pipe manufacturer based in China with 25 years of experience. 

The facility spans 22,000 square meters, represents a RMB 700 million investment, and operates four production lines (JCOE, ERW, SMLS, SSAW) alongside five coating lines. 

With an annual production capacity of 250,000 tons, the factory covers specifications ranging from Ø406 to Ø1524 and holds multiple international certifications (API/ASTM/EN/ISO/JIS). Focused on steel pipes, creating value for you!

HOT PRODUCTS

POPULAR ARTICLES

Click for a Quote
adnoc SOUR SERVICE PIPE
JIS G3444 STK490 is a high-strength carbon structural steel pipe primarily designed to withstand structural loads rather than transport fluids. Established under the Japanese Industrial Standards (JIS) system, the standard is titled “Carbon Steel Tubes for General Structural Purposes.” It sets forth unified technical requirements covering the entire process from production to delivery—including chemical composition, mechanical properties, manufacturing processes, dimensions and tolerances, inspection methods, product marking, and delivery specifications—to ensure consistent product quality. STK490 is a widely used high-strength grade within the JIS G3444 standard; featuring a minimum tensile strength of 490 MPa, it offers high load-bearing capacity and excellent overall mechanical properties. It is extensively utilized in large-scale steel construction projects, such as high-rise buildings, bridges, industrial plants, power transmission towers, sports stadiums, and machinery frameworks. JIS G3444 STK490 PDF Download

JIS G3444 STK490 Pipe Specifications

O.D.: 21.7 mm – 508.0 mm
W.T.: 2.0 mm – 22.0 mm

Length:

4 m – 12 m (Custom Length Available)

Process:

ERW (Electric Resistance Welded), Seamless

Tube Ends: Plain End, Beveled End, Threaded End (Upon Request)
Heat Treatment: As Welded / Heat Treatment According to Customer Requirements

JIS G3444 STK490 Features

Compared with conventional structural steel tubes such as STK400 and ASTM A500 Grade B, JIS G3444 STK490 provides approximately 20–40% higher strength, enabling lighter, stronger, and more efficient structural designs.
STK490 has a minimum tensile strength of 490 MPa, which is significantly higher than STK400 (400 MPa) and common structural steel tubes.
Manufactured under JIS G3444 requirements, STK490 provides reliable outside diameter and wall thickness control.
Get a Quote
More Products

Performance of the JIS G3444 STK490 Steel Pipe

JIS G3444 STK490 is a high-strength structural steel tube specifically developed for load-bearing applications. Unlike pipeline standards such as API 5L or ASTM A53, which focus on fluid transportation, STK490 emphasizes structural strength, weldability, dimensional accuracy, and fabrication performance.

Chemical Composition JIS G3444 STK490

ElementTypical Range (%)
Carbon (C)0.16–0.22
Silicon (Si)0.15–0.35
Manganese (Mn)0.60–1.50
Phosphorus (P)≤0.035
Sulfur (S)≤0.035

Typical mill chemistry based on commercially produced JIS G3444 STK490 steel tubes from Japanese and international manufacturers. The JIS G3444 standard specifies compliance with required mechanical properties rather than prescribing a single mandatory chemical composition for STK490.

Mechanical Properties of JIS G3444 STK490

Property Requirement
Tensile Strength ≥490 MPa
Yield Strength* ≥325 MPa
Elongation ≥23%

The key difference of STK490 is its higher strength level compared with conventional structural tubes, making it suitable for heavy-duty steel structures, bridges, towers, and industrial facilities.

Manufacturing Process of JIS G3444 STK490

The JIS G3444 STK490 standard specifies requirements regarding manufacturing methods, weld quality, heat treatment, and surface conditions for steel pipes; these requirements are detailed below.

Manufacturing Methods

Electric Resistance Welding (ERW): This is a common process in which hot-rolled steel strip is formed and then joined via high-frequency electric resistance welding to create a longitudinal seam. Seamless Pipe: Generally used for specialized structural engineering projects, this type is manufactured through processes such as piercing and rolling, resulting in a structure without welded seams. Although both manufacturing methods are permitted under the standard, ERW is the dominant process in the market. ERW offers high production efficiency, excellent raw material utilization, and consistent quality, making it highly suitable for structural piping.

Weld Quality Requirements

Ideally, the weld seam should match the properties of the base metal. The standard mandates that the weld must not compromise the pipe’s overall quality or performance; the weld zone should possess mechanical properties comparable to the base metal and meet the requirements for structural piping. The standard prohibits the following defects in the weld seam: · Cracks · Lack of Fusion · Burn-through · Significant Porosity · Harmful Slag Inclusions · Other welding defects that compromise structural strength Finally, the pipe must undergo mechanical testing—specifically tensile tests and flattening tests—to be certified as compliant. The JIS G3444 STK490 standard does not mandate Ultrasonic Testing (UT) or Eddy Current Testing (ECT); these requirements are determined by the procurement contract.

Heat Treatment

The JIS G3444 STK490 standard does not explicitly mandate heat treatment for the pipes. However, in practice, ERW pipes are typically supplied in the as-welded condition, whereas seamless pipes undergo heat treatment as part of the manufacturing process. Customers may request specific heat treatments—such as stress-relief annealing, normalizing, or full annealing—to enhance the pipe’s stability.

Surface Requirements

JIS G3444 STK490 explicitly states that the pipe surface must be smooth and uniform, and free from defects that would impair its functional performance. The surface of the steel pipe must be free from:
  • Cracks
  • Folds
  • Laminations
  • Deep scratches
  • Surface defects that compromise structural integrity
Minor rolling marks or oxidation are acceptable, provided they do not affect the pipe’s intended use.

JIS G3444 STK490 Steel Pipe Dimension

There are no mandatory size specifications; however, the table below lists commonly used sizes for your reference.

Outside Diameter (OD) mm Wall Thickness (WT) mm Approx. Weight (kg/m)
21.7 2.0 1.00
21.7 2.3 1.14
27.2 2.3 1.47
27.2 2.8 1.76
34.0 2.3 1.86
34.0 3.2 2.54
42.7 2.3 2.29
42.7 3.2 3.09
48.6 2.3 2.63
48.6 3.2 3.56
60.5 2.8 4.02
60.5 3.8 5.36
60.5 5.0 6.93
76.3 3.2 5.67
76.3 4.5 7.91
76.3 6.0 10.35
89.1 3.2 6.64
89.1 4.5 9.14
89.1 6.0 12.04
101.6 3.2 7.62
101.6 4.5 10.89
114.3 3.2 8.59
114.3 4.5 11.93
114.3 6.0 16.00
139.8 4.0 13.40
139.8 6.0 20.10
139.8 8.0 26.70
165.2 4.5 17.80
165.2 6.0 23.90
165.2 8.0 31.50
216.3 6.0 31.50
216.3 8.0 41.70
216.3 10.0 51.70
267.4 6.0 39.00
267.4 8.0 51.50
267.4 10.0 63.80
318.5 8.0 62.10
318.5 10.0 77.20
318.5 12.0 92.00
355.6 8.0 69.50
355.6 10.0 86.70
355.6 12.0 103.60
406.4 8.0 79.80
406.4 10.0 99.30
406.4 12.0 118.70
457.2 10.0 112.00
457.2 12.0 134.00
508.0 10.0 125.00
508.0 12.0 150.00
508.0 16.0 198.00
Get a Quote

Outside Diameter Tolerance

Nominal Outside Diameter (OD) Permissible Deviation
≤48.6 mm ±0.5 mm
＞48.6 mm ±1% × OD
Nominal wall thickness Permissible deviation
All specifications ±12.5% × WT

FAQ

1.STK490 VS ASTM A500 Grade C

Item STK490 ASTM A500 Gr.C
Country Japan USA
Standard JIS ASTM
Yield 325 317
Tensile 490 427
Shape Round Round/Square
Common Market Asia North America

2. Why is STK490 widely used in Japan?

Key reasons: ① High frequency of earthquakes in Japan Requires high ductility High strength ② Increasing structural spans High-rise buildings Large stadiums Airports ③ Japanese design standards for steel structures Encourage the use of high-strength steel. ④ Reducing the building’s self-weight Lowers seismic loads.
16050449f3dc8c5d1273f66dd2aedb3b
167747803494 (1)
0d1eea937d701b8dcc7fc39c9c9e75c4
d5404a4d-03e8-4fc1-8dd8-e62240e0fb9b

Related Products

LSAW PIPE

LSAW Pipe

API 5L Grade B

ERW Pipe

SMLS PIPE

SMLS Pipe

ssaw pipe

SSAW Pipe

OCTG

OCTG

HOLLOW SECTIONS

Hollow Section

Tell us more about your project or the product you’re interested in.

Get A Quote Now

Fill in the form below and our team will be happy to assist you