JIS G3475 STKN400 STKN490 Carbon Steel Seamless Tubes: Thick Wall Steel Pipe for Building Structure
Material
JIS G3475 specifies the requirements for carbon steel seamless tubes used in various structural applications. The STKN400 and STKN490 grades are particularly designed for precision applications, providing excellent mechanical properties and weldability.
Specification
The seamless tubes under JIS G3475 are characterized by their high strength and durability, making them suitable for construction and structural applications. The specifications include dimensions, tolerances, and testing methods to ensure quality and performance.
Key Features
- High Strength: Designed to withstand heavy loads and stresses.
- Seamless Construction: Provides uniformity and reduces the risk of failure.
- Weldability: Suitable for various welding processes.
- Corrosion Resistance: Enhanced resistance to environmental factors.
Chemical Composition
| Element |
STKN400 (%) |
STKN490 (%) |
| Carbon (C) |
0.20 max |
0.25 max |
| Manganese (Mn) |
0.30 - 0.60 |
0.30 - 0.60 |
| Phosphorus (P) |
0.030 max |
0.030 max |
| Sulfur (S) |
0.030 max |
0.030 max |
| Silicon (Si) |
0.10 - 0.40 |
0.10 - 0.40 |
| Chromium (Cr) |
0.25 max |
0.25 max |
| Nickel (Ni) |
0.25 max |
0.25 max |
Mechanical Properties
| Property |
STKN400 |
STKN490 |
| Yield Strength (MPa) |
400 min |
490 min |
| Tensile Strength (MPa) |
490 - 610 |
590 - 720 |
| Elongation (%) |
20 min |
18 min |
| Hardness (HB) |
160 max |
180 max |
Steel Grade
- STKN400: Suitable for applications requiring moderate strength and good weldability.
- STKN490: Designed for applications that demand higher strength and durability.
Application
The STKN400 and STKN490 seamless tubes are widely used in:
- Construction of buildings and structures
- Manufacturing of machinery and equipment
- Automotive and transportation industries
- Oil and gas pipelines
Possible Alternative Grades
- JIS G3445: Similar applications with different mechanical properties.
- ASTM A53: Commonly used for structural steel pipes in various industries.
- EN 10210: European standard for hot-finished structural hollow sections.
These alternative grades may offer similar properties but should be evaluated based on specific application requirements.
TORICH Group, an one-stop service provider of raw materials engaged in raw material production, R&D and
trade, has 30+ years of experience in the market, exported to 56 +countries, and won good reputation and
credibility among domestic and foreign customers.
The company's production plant covers an area of over 10,000 square meters, with an annual production
capacity of 50,000 tons of materials and a comprehensive trading and warehousing capacity of 100,000 tons, which can satisfy customers' personalized needs for raw materials in terms of diversity and timeliness.
The group holds shares in more than ten domestic production entities, whose main products include
seamless steel pipes ( carbon steel and stainless steel), welded pipes ( carbon steel and stainless steel), pipe fittings ( carbon steel and stainless steel), titanium (titanium tubes, titanium rods, titanium cakes, titanium plates, etc.), aluminum (aluminum tubes, aluminum rods, aluminum die casting, aluminum casting, CNC machining), and CNC deep processing of metal materials such as tubes, rods, and casting parts.
Over the past 30 years, the company has been gradually developing new technologies and materials to meet
the growing needs of customers and various diversified needs, exporting to more than 56 countries and still
increasing the number of exporting countries, aiming to help customers to solve the demand for raw materials, and to facilitate one-stop purchasing for customers.
Q: Are you trading company or manufacturer ?
A: manufacturer,also can do trading.
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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.
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A: Yes, we could offer the sample for free charge but need pay the cost of freight.
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A: Payment<=2000USD, 100% in advance. Payment>=2000USD, 30% T/T in advance ,balance before shippment.
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