JIS G3429 Seamless Pipe
JIS G3429 seamless pipes are high-quality steel pipes designed for high-pressure environments. These pipes have excellent strength, durability, and corrosion resistance. They are made of high-grade alloy steel to achieve the best performance in high-pressure applications. Seamless design ensures uniform strength and reduces the risk of failure.
Our steel pipes meet JIS G3429 standards. We can pack or paint the steel pipes as per customer requirements. We also have a large stock of various sizes and grades, please contact us for a quote.
If you want to know more about the grades and sizes of steel tubes, please send your requirements to email(sale@gneesteelpipe.com) or WhatsApp.
General Parameters Of JIS G3429 Seamless Steel Tube
| Product | Grade Available |
| Length | Single Random, Double Random & Required Length & Custom Size Available |
| Ends | Beveled End, Plain End, Treaded Protected With Plastic Caps |
| Origin | China |
| Monthly Output | 20 million-30 million pieces per month |
| Grade Availavble | STH11 / STH12 / STH21 / STH22 |
| Value Added Service | Draw & Expansion as per required Size & Length, Polish (Electro & Commercial) Annealed & Pickled Bending, Machining Etc. |
| Applications | Gas cylinders for industrial gases / High-pressure vessel construction / Automotive and aerospace applications |
More information About JIS G3429 sMLS pipe
| Class | C | Si | Mn | P | S | Ni | Cr | Mo |
| STH11 | 0.50 max | 0.10~0.35 | 1.80 max | 0.035max | 0.035max | – | – | – |
| STH12 | 0.30~0.41 | 0.10~0.35 | 1.35~1.70 | 0.030max | 0.030max | – | – | – |
| STH21 | 0.25~0.35 | 0.15~0.35 | 0.40~0.90 | 0.030max | 0.030max | 0.25 max | 0.80~1.20 | 0.15~0.30 |
| STH22 | 0.33~0.38 | 0.15~0.35 | 0.40~0.90 | 0.030max | 0.030max | 0.25 max | 0.80~1.20 | 0.15~0.30 |
| STH31 | 0.35~0.40 | 0.10~0.50 | 1.20~1.50 | 0.030max | 0.030max | 0.50~1.00 | 0.30~0.60 | 0.15~0.25 |
| Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) |
| STH11 | 540 | 415 | 25 |
| STH12 | 620 | 490 | 20 |
| STH22 | 735 | 585 | 18 |
| STH24 | 930 | 785 | 15 |
| Tolerance on outside diameter | Tolerance on wall thickness | Tolerance on wall thickness disparity | Tolerance on length |
| 1% | +30% | Within 20% of the nominal wall thickness | >+30mm |
Features & Advantages of JIS G3429 Seamless Tube
Gnee has been providing high-quality steel pipes with a variety of excellent properties to customers around the world for 15 years.
High Tensile Strength
JIS G3429 steel tubes are engineered for exceptional tensile strength, providing resistance against deformation under high pressure. This strength makes them suitable for critical applications like gas cylinders where stability is paramount.
Seamless Structure
These tubes are manufactured using a seamless process, which reduces the risk of leakage and enhances their performance under high pressure. The seamless design contributes to their reliability in containing gases safely.
Corrosion Resistance
The composition of JIS G3429 steel is designed to resist corrosion. This resistance is crucial for gas storage, as it protects the material from potential damage due to moisture or other environmental factors.
Excellent Weldability
While the seamless design means that these tubes are generally not welded, they offer good weldability when modifications or adjustments are required, giving manufacturers flexibility during installation.
Favorable JIS G3429 Seamless Steel Tubing Prices
We can provide competitive factory prices to global customers.
Volume Discount
We provide gradually decreasing unit prices based on the quantity of steel pipes. For example, when the purchase volume reaches 100 tons, 200 tons, and 500 tons, Gnee Steel Pipe will give different discounts.
Custom Pricing
According to the specific needs (such as steel pipe material, specifications, quantity, delivery time, etc.), we can provide flexible customized quotations to meet the budgets and requirements of different customers.
Project-Based Pricing
Gnee can provide special preferential contract prices for large projects. In the process, we can also formulate flexible price plans based on the payment schedule or delivery time of the project.
What Can Gnee Guarantee For Our Customers?
Quality Assurance
As a supplier with 15 years of experience, we promise to provide high quality steel pipes, which comply with international standards and industry specifications, such as ISO, ASTM, EN, or JIS, etc. Gnee can provide relevant quality certifications, test reports & material certifications.
Faster Delivery Time
Gnee has a large inventory of steel pipes and multiple production lines. We respond to customers’ orders on time and provide customers with reasonable transportation and delivery solutions. We promise to deliver steel pipes according to the time specified in the contract.
Comprehensive Services
Gnee provides comprehensive services for customers. Services include steel pipe customization, technical support & consultation, sample provision, etc. Through the guidance of a professional team, customers can ultimately purchase steel pipe specifications, sizes, and materials that meet project requirements.
Competitive Price
As a supplier, Gnee can promise to provide competitive prices and conduct reasonable negotiations with customers. Gnee has its own factory and production lines. Also, we have established stable cooperative relationships with many reliable raw material suppliers and can provide high-quality steel pipes to the world at factory prices.
Inventory And Delivery Of Steel Pipe
Gnee factory has a large inventory of steel pipes and supports bulk orders. We also offer a variety of logistics solutions. Come and contact us.
Why Choose Gnee As A Steel Pipe Distributor?
In addition, our tubes have been successfully exported to more than 60 countries such as Vietnam, Malaysia, Indonesia, Pakistan, UAE, and South Korea, etc. Many regular customers visit our company and factory and make multiple orders.
What Services Does Gnee Provide?
Gnee can provide the following measurement services for pipe:
1. Dimensional measurement: Measure the dimensional parameters such as length, width, and thickness by measuring instruments to ensure the pipe is qualified and meets the design requirements.
2. Surface measurement: Measure parameters such as flatness, unevenness, and surface roughness of pipe surface to help ensure that the quality and surface state of the pipe meet the requirements.
3. Thickness measurement: Use a thickness measuring instrument to accurately measure the thickness of the pipe to ensure that it meets the design requirements.
4. Material measurement: Use material analysis instruments to measure the chemical composition and mechanical properties of the product to ensure that the quality and performance meet the requirements.
5. Bending and Deformation Measurements: The degree of bending and deformation of the steel pipe is measured and monitored by using tools such as bending measuring instruments and displacement sensors to ensure that it is within the allowable range.
Gnee can customize the size and shape of steel pipes for your project according to specific project needs. The custom design of the pipe is carried out by a professional engineer and design team. Based on the requirements and constraints of the project, they will use calculation and simulation tools, combined with experience and technical knowledge, to optimize the steel pipe design to meet the specific needs of your engineering.
● According to the strength requirements of structural design, adjust the thickness, width, and length of pipes.
● The shape of the steel pipe can be designed according to the characteristics of the project.
● If you consider the convenience of installation and maintenance, we can also add openings and passages for easy access and operation in the design for areas that require frequent maintenance.
Purchasing Gnee steel pipe can provide the following deep processing services. We can customize according to the specific needs of customers to meet the requirements.
Cutting service: Pipe can be custom cut to obtain the desired shape and size according to the needs of customers. For example, flame cutting, plasma cutting, laser cutting, etc., can cut steel pipes into required blocks, special-shaped parts.
Bending and forming: Pipes are bent and formed by stress application and appropriate processes to obtain the desired shape.
Welding service: Pipe can be subjected to various types of welding services, including manual arc welding, gas-shielded welding, laser welding, etc.
Turning and machining of holes: Turning and machining of holes in pipes by using machining equipment. These processes produce smooth surfaces, precise holes and threads to meet specific assembly requirements.
Surface treatment: In order to improve the corrosion resistance and aesthetics of the steel pipe, surface treatment can be carried out. This includes methods such as spraying, hot-dip galvanizing, electroplating, etc. to add a protective layer and provide corrosion resistance.
Gnee can provide the following testing services through third-party testing agencies. These third-party testing services can provide independent, objective verification that pipes comply with relevant standards and regulations.
Material chemical composition analysis: Through chemical composition analysis, determine whether the composition of the steel pipe meets the standard requirements.
Mechanical performance test: Mechanical performance test includes tensile test, impact test, bending test, etc., which are used to determine whether the mechanical properties such as strength, toughness and ductility of products meet the specified requirements.
Metallographic testing: Through metallographic testing, check the structure, grain size, non-metallic inclusions, etc. of pipes to evaluate their quality and performance.
Corrosion performance test: Through the corrosion performance test, evaluate the corrosion resistance of pipes, including salt spray corrosion resistance, chemical corrosion resistance, etc.
Hardness test: Hardness test is used to measure the hardness of pipe, and its strength and wear resistance can be evaluated according to the hardness value.
Ultrasonic flaw detection: Ultrasonic flaw detection is used to detect internal defects of pipes, such as cracks, pores, inclusions, etc.
