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Help CenterSteel Pipe & Tube，Common Grades - Q235B / Q355B - 20# Carbon Steel - S235JR / S355JR - ASTM A53 Gr.B, ASTM A106 Gr.B - ST37, ST44, ST52
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Steel Pipe – Complete Product Detailed Description
1. Product Overview
Steel pipe is a hollow cylindrical steel product divided into seamless steel pipe and welded steel pipe. Featuring high pressure resistance, uniform wall thickness, strong toughness, excellent weldability and stable mechanical performance, steel pipe is widely used in fluid transportation, pipeline engineering, construction structure, mechanical manufacturing and petroleum industrial projects.
Our steel pipes are manufactured in strict accordance with international standards with precise dimension tolerance, smooth inner and outer surface, no cracks and no defects. Stable quality and complete specifications make our products widely exported to Africa, Central Asia, Southeast Asia, Europe and Middle East countries.
2. Main Product Types
2.1 Seamless Steel Pipe
Produced by hot rolling, cold drawing and piercing process with no welding seam.
- Features: High pressure resistance, high strength, high temperature resistance, corrosion resistance
- Usage: Oil and gas pipeline, hydraulic engineering, high-pressure equipment, boiler pipe, chemical industry pipeline
2.2 Welded Steel Pipe (ERW / HFW)
Electric resistance welded pipe with straight seam welding.
- Features: Smooth surface, precise size, low cost, large supply capacity
- Usage: Water supply, drainage, construction structure, fencing, general fluid transportation
2.3 Galvanized Steel Pipe
Hot-dip galvanized anti-rust treatment, with dense zinc coating.
- Features: Anti-corrosion, long service life, suitable for outdoor and humid environment
- Usage: Water pipe, fire pipe, greenhouse pipe, municipal pipeline engineering
2.4 Black Steel Pipe
Black painted or oiled surface for anti-rust during shipping, widely used for structure and general pipeline projects.
3. Material Grades & International Standards
Common Grades
- Q235B / Q355B
- 20# Carbon Steel
- S235JR / S355JR
- ASTM A53 Gr.B, ASTM A106 Gr.B
- ST37, ST44, ST52
Executive Standards
- GB/T 8163, GB/T 3091
- ASTM A53 / A106
- EN 10217 / EN 10219
- JIS G3444 / G3452
We provide Mill Test Certificate, Pressure Test Report, Ultrasonic Inspection Report and full export documents for customs clearance and third-party inspection.
4. Technical Specifications
Outer Diameter Range
21.3mm – 610mm (welded pipe)
10mm – 530mm (seamless pipe)
Wall Thickness
1.5mm – 20mm
Standard Length
- 5.8m / 6m / 12m
- Custom cutting and fixed length available
Product Performance
- High pressure bearing capacity
- Uniform roundness and straightness
- Good bending, threading and welding performance
- No inner burrs, no cracks, no layered defects
5. Core Product Advantages
1. High Pressure & Structural Stability
Uniform wall thickness and compact internal structure ensure safe operation under high pressure and harsh working conditions.
2. Precise Dimension Tolerance
Strict quality control guarantees smooth assembly, threading, cutting and construction installation.
3. Excellent Anti-Corrosion Performance (Galvanized Type)
Uniform zinc coating greatly improves rust resistance and extends pipeline service life.
4. Full Specifications & Stable Supply
Complete sizes and grades in stock, supporting bulk orders, mixed container loading and long-term framework cooperation.
6. Wide Application Fields
- Water supply, drainage and sewage pipeline engineering
- Fire protection pipeline, gas pipeline and fluid transportation
- Oil field, chemical industry and high-pressure boiler equipment
- Steel structure building, support frames, fence and construction engineering
- Mechanical manufacturing, hydraulic system and pipeline accessories
- Municipal engineering, agricultural greenhouse and outdoor piping system
7. Export Packaging & Logistics
- Packing: Standard seaworthy bundle packing with steel strips, plastic cap protection at both ends, waterproof packing
- Loading Port: Qingdao Port
- Container: 20GP / 40GP full container loading
- Delivery Cycle: 5–7 working days for spot goods
- Support customized processing, threading, grooving, cutting and bulk shipment
8. Quality & After-Sales Service
All steel pipes pass hydrostatic pressure test, ultrasonic test, dimension inspection and surface quality inspection before delivery. We ensure zero defective products and stable batch quality.
Professional foreign trade team provides one-stop service including technical guidance, inspection arrangement, document preparation and after-sales support for global buyers.
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