Seamless Steel Tube
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GB/T8162-2008 Seamless Steel Pipe for Structure

Payment Term:T/T, L/C, Western Union, etc
Design Style:customizable
Delivery Time:7 Days
Transportation:By sea or Land transportation

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Product Description

GB/T8162-2008 Seamless Steel Pipe for Structure

    Seamless steel pipe is a long strip of steel with a hollow cross-section and no seams around its perimeter. Its name accurately describes its core manufacturing process: it is formed in one step from a single solid billet through key technologies such as piercing, hot rolling, or cold drawing, rather than being welded from rolled plates. This gives it inherent advantages in structure and performance compared to welded pipe, making it the preferred choice for demanding industrial applications.

Product Parameters

Product Name

Seamless Steel Tube

Type

Steel Pipe

Outer diameter

Round Tube

4mm-200mm

Square Tube

10*10mm-100*100mm

Rectangular Tube

10*20mm-50*100mm

Wall Thickness

0.6mm-6.0mm

Length

1-6 meters, Length can be customized

Standard

ASTM, AISI, JIS, GB, DIN, EN, etc.

Surface

Black, Bright Polished, Rough Turning, Matt Surface Treatment, No. 4. BA, etc.

Scope of Application

Common applications for stainless steel pipes include food processing,

Textile operations, Breweries, Water treatment plants, Oil and gas processing,

Fertilizers and pesticides, Chemical applications, Construction, Pharmaceuticals, Auto parts, etc.

Certificate

ISO, SGS, BV, etc.

Production Technology

Hot Rolling, Cold Rolling

Edge Processing

Edging, Trimming

Product Display

Yuedong-Space-V5-Luxury-Modern-Container-House-Tiny-Pod-Home-Steel-Structure-Capsule-House-for-Resort-and-Camp_副本

Characteristics of seamless stainless steel pipes

The characteristics of seamless stainless steel pipes are high strength, strong corrosion resistance, resistance to high temperature and high pressure, no welds, good structural integrity, good cross-sectional uniformity, long service life, and are suitable for harsh environments.

1. Uniform Structure and High Strength

* No Welded Weaknesses: Due to its integral molding, the material is uniform throughout the pipe, avoiding the weaknesses of welded pipes such as uneven structure, potential slag inclusions, or cracks.

* Excellent Pressure Bearing Capacity: It can uniformly withstand higher internal and external pressures, making it an ideal choice for high-pressure fluid transportation and core components of high-pressure

equipment.

2. Superior Reliability and Safety

* Under harsh conditions such as high temperature, high pressure, impact, and fluctuating loads, seamless steel pipes exhibit higher safety and longer service life due to their homogeneous structure,

greatly reducing the risk of leakage or rupture due to weld failure.

3. Wide Range of Sizes and Precisions

* Flexible combinations of outer diameter and wall thickness, from extremely thin walls to extremely thick walls, meeting the needs of different structural supports and fluid transportation.

* High-precision dimensions, excellent surface finish, and superior mechanical properties can be obtained through cold rolling/cold drawing processes.

4. Diverse Material Selection

* Various materials such as carbon steel, alloy steel, and stainless steel can be selected according to application requirements to meet special performance requirements such as corrosion resistance,

high temperature resistance, and low temperature resistance.

Application areas of seamless stainless steel pipes

It is precisely because of its excellent performance that seamless stainless steel pipes are used in fields with extremely high requirements for safety and reliability.


Seamless steel pipes, due to their irreplaceable advantages, are hailed as the "blood vessels" of industry and are widely used in:

  • Energy Industry:

Boiler Tubes: Superheaters, reheaters, economizers, and water-cooled walls of power plant boilers.

High-Pressure Pipelines: Oil and natural gas drilling and long-distance transportation.

Hydraulic Supports: Core pressure-bearing components of coal mine hydraulic support systems.

  • Mechanical Engineering:

Structural Tubing:

Components requiring high strength and torsional resistance, such as heavy machinery, automotive drive shafts, and axles.

  • Chemical Equipment:

Reactors, heat exchangers, and pipelines, especially in corrosive media environments, often using seamless stainless steel or alloy steel pipes.

  • Aerospace and Military Industry:

Precision tubing with extremely high requirements for material weight, strength, and reliability.

  • Transportation:

Shipbuilding, high-speed rail braking systems, and chassis structures.

FAQ
1. Q: What is the difference between seamless pipes and welded pipes?
A:
Structure: Seamless pipes have no welds, and welded pipes have longitudinal or spiral welds;
Strength: Seamless pipes have higher overall strength and are suitable for high-pressure scenarios (such as boilers and hydraulic systems);
Cost: The production process of seamless pipes is complex, and the price is 10%-30% higher than that of welded pipes.
2. Q: How to choose the material of seamless pipe?
A:
General environment: choose Q235 or 20# carbon steel (low cost, easy to process);
Corrosive environment: choose 304/316L stainless steel or galvanized seamless pipe;
High temperature and high pressure: choose 15CrMo, 12Cr1MoV and other alloy pipes (specific temperature and pressure parameters must be provided).
3. Q: Can the size of seamless pipe be customized?
A:
Regular specifications (outer diameter 6-630mm, wall thickness 0.5-50mm) can be customized in length (such as fixed length 6m, 9m);
Special caliber or wall thickness requires mold production, the minimum order quantity is higher (usually ≥5 tons), and the delivery time is extended by 2-4 weeks.
4. Q: How to detect the quality of seamless pipes?
Answer:
Appearance: no cracks, folds, or scars on the surface, and uniform wall thickness;
Non-destructive testing: ultrasonic (UT) and eddy current (ET) detection of internal defects;
Pressure test: water pressure test (such as water pressure 10MPa, pressure maintenance for 5 minutes without leakage).
5. Q: How to prevent rust during transportation of seamless pipes?
Answer:
Short-term transportation: can be naked in dry environment, and covered with waterproof cloth in humid environment;
Long-term storage: stored in a dry warehouse, ≥20cm from the ground, regularly check the surface rust, and re-oil if necessary.



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