JIS G3439 STO-G, STO-H, STO-J, STO-N, STO-C Seamless Steel Tube Oil Well Casing Tubing Oil Drilling Pipe
Introduction
The JIS G3439 standard specifies the requirements for seamless steel tubes used in oil well casing and tubing. This standard is crucial for ensuring the integrity and reliability of pipes used in drilling operations. The various grades under this standard, including STO-G, STO-H, STO-J, STO-N, and STO-C, are designed to meet specific performance criteria in oil drilling applications.
Material
The seamless steel tubes covered by JIS G3439 are manufactured from high-quality carbon and alloy steels. These materials are selected for their strength, durability, and resistance to corrosion, which are essential for the harsh conditions encountered in oil drilling.
Specification
The specifications for JIS G3439 seamless steel tubes include dimensions, tolerances, and mechanical properties that ensure the tubes can withstand high pressures and temperatures during drilling operations.
Key Features
- Seamless Construction: Provides superior strength and reliability.
- High Pressure Resistance: Designed to withstand the extreme conditions of oil drilling.
- Corrosion Resistance: Suitable for use in various environments, including corrosive conditions.
- Versatile Applications: Can be used in different types of oil wells.
Chemical Composition
| Grade | C (%) | Si (%) | Mn (%) | P (%) | S (%) | Cr (%) | Ni (%) | Mo (%) |
| STO-G | 0.25 | 0.15 | 0.60 | 0.025 | 0.025 | 0.30 | 0.30 | 0.10 |
| STO-H | 0.28 | 0.20 | 0.70 | 0.025 | 0.025 | 0.40 | 0.40 | 0.15 |
| STO-J | 0.30 | 0.25 | 0.80 | 0.025 | 0.025 | 0.50 | 0.50 | 0.20 |
| STO-N | 0.35 | 0.30 | 0.90 | 0.025 | 0.025 | 0.60 | 0.60 | 0.25 |
| STO-C | 0.40 | 0.35 | 1.00 | 0.025 | 0.025 | 0.70 | 0.70 | 0.30 |
Mechanical Properties
| Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) | Hardness (HB) |
| STO-G | ≥ 245 | 400-550 | ≥ 20 | ≤ 200 |
| STO-H | ≥ 265 | 450-580 | ≥ 18 | ≤ 210 |
| STO-J | ≥ 285 | 480-600 | ≥ 16 | ≤ 220 |
| STO-N | ≥ 305 | 500-620 | ≥ 14 | ≤ 230 |
| STO-C | ≥ 325 | 520-640 | ≥ 12 | ≤ 240 |
Steel Grade
The steel grades specified in JIS G3439 are categorized based on their chemical composition and mechanical properties. Each grade is tailored for specific applications and performance requirements in oil drilling.
Application
The seamless steel tubes produced under JIS G3439 are primarily used in:
- Oil well casing
- Tubing for oil drilling
- Other applications requiring high strength and corrosion resistance
Possible Alternative Grades
While JIS G3439 grades are widely used, alternative grades may be considered based on specific project requirements. Some possible alternatives include:
- API 5CT
- ASTM A106
- ASTM A53
These alternatives may offer similar mechanical properties and chemical compositions, making them suitable for various oil drilling applications.
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.
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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