Stainless Steel Industrial Welded Pipe, Stainless Steel Product Pipe

Q: What is the difference between stainless steel industrial welded pipe and seamless pipe?

Welded pipe is formed by welding a stainless steel strip, offering cost-effectiveness and suitability for low-to-medium pressure applications. Seamless pipe is extruded from a solid billet without a weld seam, providing higher pressure and temperature resistance for demanding environments.

Q: Which stainless steel grade (304 vs 316) should I choose for my project?

304 stainless steel works well for indoor furniture, decorative pipes and general industrial use in non-coastal areas. 316 stainless steel contains molybdenum for better resistance to chlorides and acids, making it ideal for outdoor marine environments, chemical plants and liquid cooling systems.

Q: What surface finishes are available for your architectural and decorative pipes?

Shuangsen offers mirror (No. 8), brushed (No. 4 / HL), satin/matt, titanium coated / PVD colors (gold, black, bronze), and sanded/bead blasted finishes for architectural and decorative pipes.

Q: How do you ensure the quality of your welded pipes?

Shuangsen uses online roundness control system, internal weld leveling technology, bright solid melting heat treatment, 100% eddy current testing, hydrostatic testing up to 1200 psi, and provides material test certificates for every batch.

Q: What is liquid cooling rack manifold pipe and where is it used?

Liquid cooling rack manifold pipe is used in AI data centers, server racks, battery energy storage systems and high-power electronics to distribute coolant evenly. Shuangsen's manifolds are made from 316L stainless steel with precision-drilled ports and laser-welded joints for leak-proof operation.

Q: Can you provide custom sizes and small quantity orders?

Yes, Shuangsen offers custom outer diameters from 6mm to 630mm, wall thickness from 0.5mm to 12mm, any length from 1m to 12m, custom shapes (round, square, rectangular, oval) and small MOQ starting from 500kg or trial orders of 100 pieces.

Q: What certifications do you hold?

Shuangsen holds ISO 9001:2015, ISO 14001, CE (PED 2014/68/EU), and complies with GB/T 12771, ASTM A249, A312, EN 10217-7. Third-party inspection reports from SGS, BV or TÜV are available upon request.

Why Choose Shuangsen?

25+ Years Experience

Founded 1999, 20,000㎡ facility, 133 production lines.

Advanced Tech

Online roundness control, internal weld leveling, bright heat treatment.

Strict Quality

ISO 9001, CE, 100% eddy current + hydrostatic testing (1200 psi).

Full Customization

OD 6–630mm, WT 0.5–12mm, any length, MOQ from 500kg.

Global Shipping

Near Ningbo/Shanghai ports, 30+ countries served.

One‑Stop Supply

Welded, seamless, decorative, liquid cooling, fittings.

Frequently Asked Questions

Q1: What is the difference between stainless steel industrial welded pipe and seamless pipe?

Welded pipe is formed by welding a stainless steel strip or plate. It is more cost‑effective, available in longer continuous lengths, and suitable for low‑to‑medium pressure applications (e.g., water, food processing, structural use).
Seamless pipe is extruded from a solid billet without a weld seam. It offers higher pressure and temperature resistance, making it ideal for high‑pressure steam, chemical reactors, and oil & gas transmission. However, it is more expensive and has stricter size tolerances.
For most industrial conveying and structural needs, Shuangsen’s industrial welded pipe delivers excellent strength and corrosion resistance at a better price point.

Q2: Which stainless steel grade (304 vs 316) should I choose for my project?

304 stainless steel is the most common grade, offering good corrosion resistance, formability, and value. It works well for indoor furniture, decorative pipes, kitchenware, and general industrial use in non‑coastal areas.
316 stainless steel contains molybdenum, which significantly improves resistance to chlorides and acids. It is recommended for outdoor marine environments, chemical plants, pharmaceutical equipment, and liquid cooling systems (like Shuangsen’s liquid cooling rack manifold pipe).
If your application involves salt water, high humidity, or corrosive chemicals, choose 316. For standard dry or indoor conditions, 304 is perfectly suitable.

Q3: What surface finishes are available for your architectural and decorative pipes?

Shuangsen offers a variety of surface finishes for pipes used in architecture and decoration:
- Mirror (No. 8): Highly reflective, ideal for upscale lobbies, elevators, and showrooms.
- Brushed (No. 4 / HL): Fine linear grain, scratch‑resistant, perfect for handrails and door frames.
- Satin / Matt: Non‑glare, suitable for industrial furniture and outdoor structures.
- Titanium coated / PVD color: Gold, black, bronze, rose gold – for decorative accents.
- Sanded / Bead blasted: Uniform matte texture, hides fingerprints.
All finishes are applied using advanced equipment to ensure consistency and long‑lasting appearance.

Q4: How do you ensure the quality of your welded pipes?

Shuangsen implements a strict quality control system following ISO 9001 standards. Our process includes:
- Online roundness control system to maintain precise outer diameter.
- Online internal weld leveling technology for a smooth inner surface.
- Online bright solid melting heat treatment to eliminate weld stress and restore corrosion resistance.
- 100% eddy current testing, hydrostatic testing (up to 1200 psi), and dimensional checks before packing.
We also provide material test certificates (MTC) for every batch, including chemical composition and mechanical properties.

Q5: What is liquid cooling rack manifold pipe and where is it used?

Liquid cooling rack manifold pipe is a key component in high‑density cooling systems for AI data centers, server racks, battery energy storage systems (BESS), and high‑power electronics. It distributes coolant evenly to each server or battery module.
Shuangsen’s manifolds are made from 316L stainless steel for superior corrosion resistance against coolants (e.g., glycol‑water mixtures). Features include:
- Precision‑drilled ports for uniform flow.
- Laser‑welded joints to prevent leaks.
- Customizable sizes (threaded, flanged, or press‑fit connections).
These pipes are critical for maintaining operating temperatures in modern AI computing centers, where a single leak could damage millions in equipment.

Q6: Can you provide custom sizes and small quantity orders?

Yes. Shuangsen specializes in both standard and customized stainless steel pipes. We can produce:
- Outer diameters from 6mm to 630mm.
- Wall thickness from 0.5mm to 12mm (or thicker for seamless).
- Any length from 1m to 12m (longer upon request).
- Custom shapes (round, square, rectangular, oval, and special profiles).
- Small MOQ: as low as 500kg for standard grades, or trial orders of 100 pieces for common sizes.
Our engineering team will review your drawings and provide a solution within 48 hours.

Q7: What certifications do you hold?

Zhejiang Shuangsen Metal Technology Co., Ltd. is committed to international quality standards. Our certifications include:
- ISO 9001:2015 (Quality Management System)
- ISO 14001 (Environmental Management)
- CE (PED 2014/68/EU) – Pressure Equipment Directive
- GB/T 12771, ASTM A249, A312, EN 10217-7 compliance
- Third‑party inspection reports from SGS, BV, or TÜV available upon request.
We constantly update our certifications to meet global market requirements.

Stainless Steel Industrial Welded Pipe
Stainless Steel Industrial Welded Pipe is formed by welding stainless steel sheets rolled into a tube. It has high strength and corrosion resistance, and is particularly suitable for industries such as chemical, petroleum, and food processing that have high requirements for hygiene and durability. Its advantage is that the cost is lower than that of seamless pipes, but the pressure bearing capacity is good. If the welding process is good, the sealing is also reliable. When choosing industrial welded pipes, you have to look at the material (such as 304 or 316), wall thickness and weld quality. Shuangsen’s industrial welded pipes meet ASTM A249/A312 standards and are available for global shipment. Contact our team for a quote.
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Stainless Steel Product Pipe
Stainless Steel Product Pipe generally refers to stainless steel pipes used to make finished products, such as furniture, equipment, and hardware. They have high requirements for precision, small dimensional deviation, and smooth surface. Many stainless steel stair handrails, shelves, and display racks use this kind of pipe, which is both beautiful and durable.

Compared with industrial pipes, product pipes pay more attention to appearance and processing performance, such as whether they can be bent and whether they will deform after welding. For complex bending or hydroforming, grade 304 offers excellent ductility (elongation ≥40%) and is easy to weld without post-weld annealing. In addition, the surface can be brushed, mirrored, or sandblasted, depending on specific needs. For example, shopping mall decoration may use bright surface, and industrial equipment may use matte and scratch-resistant.

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Mechanical Structure Pipe
Mechanical Structure Pipe is mainly used in mechanical equipment, automotive parts, and engineering structures, such as hydraulic cylinders, drive shafts, and support frames. It must withstand high strength and high load, so the material and process are very important. Generally, 304 or higher strength 316L stainless steel is used.

This type of pipe usually requires precise size and good straightness, otherwise it may not fit during assembly. If used in an environment with strong vibration, fatigue resistance must also be considered. Low-quality pipes risk fatigue cracking under cyclic loads. Shuangsen pipes undergo 100% tensile and hardness testing to ensure compliance with GB/T 12771 and ASTM A370.

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Pipe for Architecture and Decoration
Pipe for Architecture and Decoration is a stainless steel pipe used to enhance the appearance, such as shopping mall railings, glass curtain wall brackets, hotel lobby decorations, etc. It must not only be strong, but also beautiful, so the surface treatment is particularly particular, and the common ones are mirror, titanium plating, color spraying, etc.

When choosing this type of pipe, it is recommended to choose 316 material for outdoor use, which is more corrosion-resistant and avoids rusting due to wind and rain. For indoor applications with no salt exposure, 304 provides a cost-effective solution with adequate corrosion resistance. In addition, pay attention to protecting the surface during installation, especially the mirror pipe. Once scratched during transportation, it is difficult to repair, affecting the overall effect.

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Stainless Steel Seamless Pipe
Stainless Steel Seamless Pipe is directly punched out of steel billets without welds, so its pressure bearing capacity is stronger than that of welded pipes, and it is suitable for high-pressure and high-temperature environments, such as boilers, chemical pipelines, and aviation parts. Its inner wall is smoother, the fluid resistance is small, and it is not easy to accumulate scale.
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Liquid Cooling Rack Manifold Pipe
Liquid Cooling Rack Manifold Pipe is mainly used in the liquid cooling system of servers, new energy batteries, and high-power electronic equipment. It is responsible for evenly distributing the coolant to each heat dissipation module. Because it is in contact with the coolant for a long time, it has extremely high requirements for corrosion resistance and sealing. Generally, 316L stainless steel or special coating pipes are used.

When selecting, pay attention to the matching of pipe diameter and flow rate. If it is too thin, it will affect the heat dissipation efficiency, and if it is too thick, it will take up space. In addition, it is best to use laser welding for the joint part to avoid leakage. After all, the most feared thing for electronic equipment is the cooling system problem. A single leak could cause catastrophic damage to expensive electronic equipment.

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About Us

Zhejiang Shuangsen Metal Technology Co., Ltd.

Our factory is located in Wenling city, near Ningbo and Shanghai Port, Zhejiang Province, China which founded in 1999s, occupied the 20,000M2 area. Our factory is a professional enterprise that specializes in the research and development, production, and operation of thin-walled stainless steel pipes, stainless steel double clamp press, groove type, socket welding type, lock expansion type pipe fittings, and other series of products. We have 133 complete sets of industrial stainless steel welded pipe assembly line equipment with foreign level "online roundness control system", "online internal weld leveling technology" and "online bright solid melting heat treatment" equipment.

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Stainless Steel Industrial Welded pipe & Product Pipe Manufacturer

Corrosion Resistance / High Strength / Outstanding Durability

25+ years of rich experience