Description
Product Overview
Stainless steel pipe is a high-performance piping solution designed for corrosive, hygienic, and high-purity industrial environments. It is widely used in chemical processing, food and beverage production, marine engineering, pharmaceutical systems, heat exchangers, and industrial fluid transport where corrosion resistance and mechanical reliability are critical.
Shenlong Pipe supplies both seamless and welded stainless steel pipe in full compliance with international standards, ensuring stable quality, full traceability, and suitability for global engineering projects.
Product Types and Manufacturing Options
Stainless steel pipes are manufactured in two main forms depending on pressure requirements and application conditions.
Seamless stainless steel pipe is produced through hot extrusion and piercing processes, offering excellent strength for high-pressure and corrosive environments. It is commonly used in critical process systems and heat transfer applications.
Welded stainless steel pipe is formed from precision-rolled steel strips and longitudinally welded using advanced processes. It provides a cost-effective solution for general industrial and structural applications without compromising corrosion resistance.
Key product categories include:
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Seamless stainless steel pipe for high-pressure service
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Welded stainless steel pipe for general industrial systems
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Large diameter welded stainless steel pipe for infrastructure and plant construction
International Standards Compliance
Shenlong stainless steel pipes are manufactured under multiple globally recognized standards to ensure compatibility across engineering specifications.
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ASTM A312 for seamless and welded austenitic stainless steel pipe
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ASTM A213 for heat exchanger and boiler tubes
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ASTM A358 for electric-fusion welded heavy-wall pipe
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EN 10216-2 for seamless pressure applications in Europe
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EN 10217-7 for welded stainless steel pressure pipe
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JIS G3459 for Japanese industrial standards
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AWWA C220 for water system applications
These standards define mechanical performance, corrosion resistance, and dimensional tolerances required for demanding industrial environments.
Stainless Steel Grades and Performance Characteristics
Different stainless steel grades are selected based on corrosion environment, temperature, and mechanical requirements.
Common grades include:
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304/L: General-purpose grade for food, water, and architectural systems
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316/L: Enhanced resistance to chloride corrosion, ideal for marine and chemical environments
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321: Titanium-stabilized grade for high-temperature applications
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347: Columbium-stabilized grade for improved creep resistance
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Duplex 2205 / 2507: High-strength duplex grades for offshore and aggressive chemical conditions
Each grade is produced under controlled metallurgical conditions to ensure consistent corrosion resistance and mechanical integrity.
Dimensional Range and Supply Capability
Shenlong Pipe provides a comprehensive size range covering both seamless and welded stainless steel pipe requirements.
| Type | Outside Diameter | Wall Thickness | Length |
|---|---|---|---|
| Seamless | 10.3–610 mm (⅛"–24") | SCH 5S–160 | 6–12 m |
| Welded | 21.3–1219 mm (½"–48") | SCH 5S–80S | 6–18 m |
| Large Diameter Welded | 355–1219 mm | Up to 30 mm | 6–12 m |
This flexibility allows engineers to select suitable pipe dimensions for both compact systems and large-scale industrial installations.
Heat Treatment and Material Condition
Austenitic stainless steel pipes such as 304L, 316L, 321, and 347 are supplied in a fully solution-annealed condition to restore corrosion resistance and mechanical stability.
Typical process parameters include:
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Heating range between 1040–1120°C
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Rapid cooling via water quenching or controlled air cooling
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Dissolution of carbides to prevent intergranular corrosion
This treatment ensures optimal performance in aggressive chemical and thermal environments.
Applications Across Industrial Sectors
Stainless steel pipe systems are widely used in industries requiring high cleanliness and corrosion resistance.
Typical applications include:
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Chemical processing and transport systems
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Food and beverage production lines
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Pharmaceutical and biotech facilities
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Marine and offshore engineering systems
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Heat exchangers and thermal systems
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Water treatment and desalination plants
These applications demand consistent surface quality and long-term resistance to chemical degradation.
Quality Assurance and Inspection System
Each stainless steel pipe undergoes strict quality control procedures to ensure compliance with international engineering standards.
Testing and inspection include:
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Chemical composition verification per heat
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Hydrostatic pressure testing for all pipes
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Positive Material Identification (PMI) for critical grades
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Ultrasonic or eddy current non-destructive testing
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Dimensional inspection for diameter, wall thickness, and length
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Solution annealing verification with mill certificates
Third-party inspection services such as SGS, BV, DNV, and TÜV are available upon request to ensure independent verification.
Key Advantages of Shenlong Stainless Steel Pipe
Shenlong Pipe provides a fully integrated supply system covering multiple standards, grades, and manufacturing types.
Main advantages include:
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Full range of austenitic and duplex stainless steel grades
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Seamless and welded production capability under one supply chain
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Strict EN 10204 Type 3.1 traceability for every shipment
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Wide dimensional coverage from small bore to large diameter pipe
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Consistent PMI testing for critical applications
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Global inspection support for international projects
Frequently Asked Questions
What is the difference between seamless and welded stainless steel pipe?
Seamless pipe has no weld seam and is preferred for high-pressure and critical applications, while welded pipe is more economical and suitable for general industrial use.
Which grade is best for marine environments?
316L stainless steel is commonly used due to its superior resistance to chloride-induced corrosion.
Can stainless steel pipe be used in food processing systems?
Yes, grades like 304L and 316L are widely used in hygienic applications due to their clean surface finish and corrosion resistance.
What is solution annealing in stainless steel pipe production?
It is a heat treatment process that restores corrosion resistance by dissolving carbides and improving microstructure stability.
Is third-party inspection available?
Yes, inspections by SGS, BV, DNV, and TÜV can be arranged upon request.
Company Information
Shenlong Pipe specializes in the manufacturing and supply of stainless steel piping systems for global industrial applications. With strict adherence to international standards and advanced production capabilities, the company delivers reliable piping solutions for corrosive and high-performance environments worldwide.
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