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When your boiler runs at 650°C and 150 bar, there’s no room for error. The wrong tube doesn’t just cause downtime—it creates safety risks, regulatory nightmares, and multi-million dollar losses. At Shanghai Maxmetal, we supply premium seamless boiler tubes engineered to thrive under extreme conditions, meeting the world’s most stringent standards.

Why Standards Matter: Decoding the Alphabet Soup

Not all boiler tubes are created equal. Different applications demand specific material properties. That’s why we stock four core standards, each a benchmark in its own right:

ASTM A179: The Heat Transfer Champion

Low-carbon seamless steel designed for one job: moving heat efficiently. Perfect for surface condensers and heat exchangers where thermal conductivity is king.

ASTM A192: The High-Pressure Workhorse

When your boiler system demands brute strength, A192 delivers. Engineered for high-pressure carbon steel applications, it’s the backbone of reliable steam generation.

ASME SA213: The Alloy Power Player

Chrome-moly alloys (T11/T12/T22) built for superheaters and reheaters. These tubes laugh at temperatures up to 650°C, resisting creep and oxidation when ordinary steel would fail. For ultra-critical applications, grades like T91 and T92 add vanadium, niobium, and nitrogen for next-level performance.

DIN 17175: The European Standard-Bearer

German-engineered alloy grades like 15Mo3 and 13CrMo44 ensure compliance with European projects while delivering exceptional high-temperature strength.

TU 14-3P-55-2001: The Russian Standard

For projects requiring Russian certification, this standard ensures full compliance with GOST-equivalent quality requirements for high-pressure boilers.

What Makes Our Boiler Tubes Battle-Ready?

Creep Resistance: Up to 650°C continuous operation without deformation

Oxidation Protection: Withstands aggressive flue gas environments

Seamless Reliability: No welds mean no weak points

Global Compliance: One supplier, multiple certifications—simplifying your procurement

Size Flexibility: Outer diameter from 15mm to 630mm, wall thickness 1.5mm to 35mm

Every tube undergoes mandatory hydrostatic testing, eddy current inspection, and ultrasonic testing. We supply EN 10204 3.1/3.2 certification and maintain full traceability from billet to finished product.

From Raw Steel to Precision Tube: Our Manufacturing DNA

Quality isn’t an accident—it’s engineered into every step:

Raw Material Validation: Billets are sampled, analyzed, and inspected before cutting. No surprises.

Hot Forming: Precision heating and piercing creates a flawless hollow shell, followed by annealing to refine grain structure.

Cold Drawing: Multiple drawing passes with phosphating and lubrication achieve exact dimensions and superior surface finish.

Heat Treatment: Controlled processes ensure optimal mechanical properties and microstructure.

Rigorous Inspection: Surface inspection, NDT, and PMI (Positive Material Identification) guarantee chemistry and integrity.

Final Validation: Straightening, cutting, marking, and a final quality review before hexagonal packing and dispatch.

This isn’t just a process—it’s a quality obsession that eliminates risk from your supply chain.

Where Our Tubes Perform

Power Generation: Supercritical and ultra-supercritical boilers, heat recovery steam generators (HRSG)

Petrochemical: Process heaters, reformer tubes, cracking furnaces

Industrial Heat Transfer: High-temperature exchangers and condensers

Global Infrastructure: Projects requiring multi-standard compliance

Simplify Your Procurement, Amplify Your Performance

Juggling multiple suppliers for ASTM, DIN, and ASME tubes? Stop. Our integrated inventory covers all major standards, reducing your vendor list from five to one. With Shanghai Maxmetal, you get:

✅ One point of contact for global specifications

✅ Consistent quality across all standards

✅ Reduced lead times with strategic stock

✅ Technical support when you need it

Our mission is to be the reliable China-based partner that creates value for you—by making complex procurement simple and risky applications safe.

Ready to spec your next boiler project with confidence? Contact our technical team today for detailed datasheets, material recommendations, and a quote tailored to your exact requirements.

Shanghai Maxmetal Co., Ltd. – Your seamless solution for seamless boiler tubes.

In the precast concrete industry, traditional methods of securing formwork are not only time-consuming and labor-intensive but can also damage expensive steel casting beds. Is there an efficient, non-destructive solution? The answer is the shutter magnet. This revolutionary tool is transforming formwork fixation, significantly accelerating production cycles.

Shuttering Magnets

What is a Shutter Magnet?

A shutter magnet, also known as a magnetic box or box magnet, is a standard tool used to securely fasten formwork, side rails, and other components to steel casting beds in the precast concrete industry. Its core consists of a robust steel housing enclosing a high-performance neodymium magnet array. Unlike older methods requiring welding or drilling, it enables non-destructive, powerful magnetic attachment, protecting the work surface and allowing for rapid adjustment and release.

Understanding the Working Principle: The Key to Success

1. Basic Principle:

Shutter magnets function as an on/off switch for magnetic force. When activated, the internal magnet array engages, creating a powerful pull directly onto the clean steel surface. This pure magnetic hold requires no bolts, welding, or mechanical locks.

2. The Critical Need for Direct Contact:

Maximum holding force is achieved only with complete, direct contact between the magnet's base and the steel bed. Any contaminant—concrete residue, rust, paint, or debris—acts as a gap. Unlike a bolted connection, magnetic force cannot "clamp through" such obstacles; even minor gaps drastically reduce performance.

3. How Air Gaps Defeat the Magnet:

The magnetic force diminishes exponentially with distance. A gap of just 1-2 mm can reduce effective holding force by 50% or more. This is why a magnet rated for 1800 kg may fail in the field. Vibration can worsen these gaps, leading to dangerous "creep" or sudden displacement of the formwork.

Six-Step Installation Guide for Secure Fixation

1. Surface Preparation (Most Critical Step): Thoroughly clean both the magnet base and the steel bed. Remove all dust, oil, grease, and hardened concrete debris. This ensures metal-to-metal contact.

2. Formwork Placement: Position all side rails, stop ends, and other formwork components accurately on the bed according to the shop drawings.

3. Magnet Placement & Adapter Use: Place the shutter magnet against the formwork. If fixing to non-ferrous materials (e.g., timber, aluminum), first attach the appropriate non-magnetic adapter to the magnet's mounting points.

4. Activation & Locking: Firmly press the activation handle or lever. You should hear/feel a solid "clunk," indicating the internal magnets are fully engaged and gaps are eliminated. Always perform a **manual tug-test** to confirm a secure lock.

5. Pouring & Curing: Proceed with concrete placement and vibration. The magnet's design ensures stability against standard construction vibrations.

6. Safe Deactivation & Removal: After the concrete has cured, use the dedicated release tool (lever) to disengage the magnetic field. Never pry the magnet off. Clean the magnet immediately after removal.

Shuttering Magnets

Avoiding Common and Costly Installation Errors

Improper installation can lead to formwork blow-outs, dimensional inaccuracies, and serious safety incidents. The most frequent errors stem from neglecting the core principles above.

Error Categories	Core risks	Key Corrective Actions
Inadequate cleaning	Adsorption capacity is severely insufficient, template displacement occurs.	Thoroughly clean both sides before installation to ensure no particulate oil or dirt remains.
Inefficient layout	Local deformation of template, out-of-tolerance dimensions of components	Based on mechanical calculations, the layout is optimized with increased density at the end corners to ensure sufficient quantity.
Incorrect operation sequence	Equipment damage, difficulty in adjustment, damage during disassembly	Strictly follow the sequence of "placement → fitting → activation" and use a special tool to release.
Neglecting maintenance and inspection	Sudden failure poses significant safety risks.	Regularly inspect the base plate for wear and tear and mechanical parts, and test the magnetic force.
Insufficient safety awareness	Pinching injury, being struck by an object	Wear protective gloves and verify the security of the lock after locking.

Alternative Option	Primary Risk in This Scenario	Conclusion vs. HDPE Geomembrane
LLDPE Geomembrane	Slightly inferior chemical resistance (especially to stress cracking), presenting higher risk in long-term contact with strong acids and metal ions.	Not Suitable. Insufficient long-term chemical safety.
PVC Geomembrane	Plasticizers can migrate in acidic environments, causing material embrittlement and a sharp drop in puncture resistance	Not Suitable. Fundamental chemical compatibility flaw.
Compacted Clay Liner	Acidic leachate alters the clay mineral structure, causing its hydraulic conductivity to increase by several orders of magnitude within years.	Not Suitable. Cannot serve as a sole reliable barrier.
1.0mm HDPE Geomembrane	Weaker resistance to stress concentration from differential settlement and puncture risks during construction	1.5mm thickness is a more robust choice, providing a greater safety margin.