Hardcore板材智造 — Dongfeng Metal Precision Engineering | Explosive‑clad composite plates and precision porous tube sheets empower high‑end equipment manufacturing.

Liaoning Dongfeng Metal specializes in the custom fabrication of various perforated plates, with a primary focus on high‑end precision composite tube sheets for nuclear power and petrochemical applications, as well as standard punched perforated sheets. Utilizing an explosive bonding process, the base material combines Q345R vessel steel with stainless steel or titanium, delivering both superior strength and excellent corrosion resistance. Supported by a segmented, coordinated precision drilling process, we maintain tight tolerances on hole diameter and spacing, ensure flatness to prevent deformation, and perform uniform chamfering on tens of thousands of holes, guaranteeing consistent and reliable accuracy.

We offer a comprehensive range of product specifications, with plate thicknesses from 2 to 300 mm and individual panels up to 4 meters in length. Round, slotted, and square holes can all be custom‑made to your requirements, and we provide one‑stop processing and delivery, including nondestructive testing and heat treatment. Our high‑end perforated tube sheets are ideally suited for nuclear power steam generators, pressure vessels, and large heat exchangers, while our standard punched perforated plates are widely used for equipment protection, screening and filtration, and architectural ventilation and sound absorption. Crafted with precision, our products meet the stringent standards of the energy‑related special‑equipment industry, and we are capable of handling large‑volume custom orders.

Bimetallic explosively welded composite plate CNC deep-hole multi-hole tube sheet Specialized heat-exchange plates for seawater desalination

1. Explosion‑bonded bimetallic plate, offering high strength and excellent resistance to severe corrosion—ideal base material for chemical‑process and nuclear‑power pressure vessels.

Explosive-clad plates (explosively welded composite plates) rely on the high-pressure shock waves generated by explosive detonation to propel two or more dissimilar metals into rapid collision, thereby inducing atomic diffusion at the interface. Metallurgical Fusion Dual‑layer or multi‑layer metal sheets that integrate high‑strength carbon steel with corrosion‑resistant precious metals such as stainless steel, titanium, nickel, and Hastelloy serve as core base materials for pressure vessels, heat exchangers, and marine engineering applications.

Core Product Advantages

1. Extremely high bonding strength   Metal atoms fuse with one another, achieving the required shear strength; it exhibits no delamination or peeling during bending, drilling, tube expansion, or exposure to high‑ and low‑temperature cycling, and complies with national standards for pressure vessels. JB/T 4733 。
2. Significant cost savings   Only the side in contact with the medium is made of expensive corrosion‑resistant metal, while the substrate is low‑cost, high‑strength carbon steel, resulting in cost savings compared to using solid stainless steel or titanium sheets. 40%-70% Material costs.
3. Balancing complementary performance   The base layer is made of carbon steel, offering high strength, excellent pressure resistance, and sufficient toughness; the surface layer is stainless steel. / Titanium is resistant to acids and alkalis, withstands chloride ions, and offers excellent corrosion resistance, while also meeting both structural load-bearing and anti-corrosion requirements.
4. Adapted to demanding operating conditions   It exhibits excellent high-temperature resistance, fatigue resistance, and impact resistance, making it suitable for long-term use in harsh environments such as high temperature and high pressure, seawater, strong acids, and radiation. It is also amenable to extensive machining, supporting deep-hole drilling, roll forming, and welding.
5. Flexible customization of specifications Thickness ratios and panel dimensions can be customized to meet specific requirements, enabling the fabrication of a wide range of finished products, including flat panels, custom-shaped components, perforated tube sheets, and equipment linings.
6. The fabrication of porous plates is highly challenging, as multiple precision constraints—such as hole‑position flatness and coaxiality—are difficult to overcome.

Perforated plates are metal sheets with uniformly distributed, densely spaced holes. They fall into two main categories: standard single‑layer perforated plates and explosively bonded perforated tube sheets. Manufactured via CNC drilling and punching to create precisely arranged hole patterns, these plates serve multiple functions—structural support, fluid flow, heat exchange and distribution, and filtration and gas permeation—making them essential components in heat exchangers, pressure vessels, and environmental‑friendly fluid‑handling systems.

Core Advantages

1. High flow efficiency: Uniform pores ensure even distribution of the working fluid, providing stable heat exchange and air permeability while minimizing clogging.
2. Reliable structural strength: The panels exhibit excellent integrity, and the composite substrate delivers high compressive resistance, making them suitable for high-pressure operating conditions.
3. Corrosion-resistant and durable: The composite‑style surface layer of titanium and stainless steel resists corrosion from seawater, acids, alkalis, and chloride ions, ensuring a long service life.
4. Highly adaptable for fabrication: hole diameter, hole spacing, and panel dimensions are all customizable, and it supports expansion‑tube, welding, and bending processes.
5. Cost control: The composite porous plate uses precious metals only on its surface layer, significantly reducing costs compared to solid corrosion‑resistant metal sheets.

Technical barriers

1. Overall flatness control is challenging.   Large panel dimensions and dense hole patterns make the panels prone to warping and deformation due to drilling‑induced cutting stresses and clamping forces, while controlling overall surface elevation differences is challenging, thus failing to meet the sealing requirements for equipment assembly.
2. Accumulation of massive hole-positioning accuracy errors   When machining thousands of closely spaced holes in succession, cumulative errors in machine tool travel and datum shifts can easily lead to uneven hole spacing and positional deviations, making it difficult to smoothly assemble the tube bundle.
3. It is difficult to ensure hole perpendicularity and coaxiality.   Deep-hole machining drills are prone to deflection, resulting in wall taper within a single hole; the coaxiality of corresponding holes at both ends of long plates exceeds tolerance, and heat-exchanger tubes experience binding during insertion, significantly increasing the rework rate.
4. Challenges in Plate Deformation and Stress Relief   After drilling, the internal stress within the sheet becomes unbalanced, leading to slow deformation during machining, unstable dimensional tolerances in the finished product, and a high risk of leakage during subsequent use.
5. Machining Consistency and Tool Wear Issues   In high-volume continuous drilling, tool wear is uneven, resulting in inconsistent hole diameters; for extra-long workpieces, poor heat dissipation further exacerbates variations in hole diameter tolerances.
6. It is difficult to control the pass rate of nondestructive testing.   Microcracks and delamination defects are prone to occur around dense holes, making large‑area nondestructive testing challenging, with flaws often concealed and quality‑inspection costs remaining high.

Segmented collaborative operations and end-to-end precision closed-loop control completely eliminate error accumulation.

To address industry‑wide challenges in machining ultra‑long, porous stainless steel tube sheets—namely, wide dimensional tolerances, a large number of hole locations, and the cumulative effect of machining errors—we have implemented a segmented, collaborative machining approach. By rationally breaking down the overall workpiece into distinct processing stages, we assign dedicated personnel and specialized machines to each segment, ensuring standardized operations. Clear task allocation and tight process integration across cutting, face milling, drilling, leveling, and nondestructive testing help eliminate the datum‑shift issues associated with long‑stroke machining on a single machine.

The entire production system has been fully established, featuring a closed-loop precision control framework that covers the entire process—from dimensional verification of incoming raw materials, to real-time in-process measurements of hole spacing, flatness, and hole perpendicularity, to comprehensive final‑product re‑inspection. Each operation is equipped with dedicated gauges and inspection standards, enabling continuous data recording and the correction of machining deviations. Data are seamlessly shared and coordinated across all workstations; any errors detected in upstream processes are promptly communicated to downstream operations, allowing for proactive adjustments to machining parameters and minimizing dimensional variation at the source.

Leveraging dual safeguards—segmented collaborative processing and a closed-loop, end-to-end quality‑inspection system—we effectively eliminate the cumulative errors arising from travel‑distance deviations, clamping stresses, and tool wear during the machining of extra‑long workpieces. This significantly reduces defects such as hole‑position misalignment, panel deformation, and excessive coaxiality deviation, enabling stable, zero‑rework machining of thousands of holes and ensuring that the finished tube sheet meets the stringent precision requirements of high‑end pressure‑vessel applications.

Dedicated to the intelligent manufacturing of high‑performance metal sheets, our premium explosive‑clad plates continue to power a wide range of cutting‑edge equipment industries.

Dedicated to the intelligent manufacturing of high‑performance metal sheets, our premium explosive‑clad plates continuously empower a wide range of cutting‑edge equipment industries. Leveraging the Shenyang Digital Intelligent Manufacturing Industrial Park, Liaoning Dongfeng Metal has partnered with Beijing University of Science and Technology to establish a joint R&D platform for metallic materials, specializing in the custom production of explosive‑clad plates and precision porous tube sheets. Supported by digitally advanced downstream processing lines, we produce titanium–steel and stainless steel–carbon steel metallurgical composite panels that feature robust interfacial bonding, resist delamination during drilling and expansion, and deliver both exceptional strength and long‑term corrosion resistance—effectively reducing material costs for high‑end equipment. Our products serve nuclear power cooling systems, chemical pressure vessels, seawater desalination heat exchangers, and environmental flue‑gas desulfurization units. Backed by an integrated rail‑road logistics supply chain, we offer one‑stop sheet‑metal solutions to manufacturers nationwide, using consistently reliable, precision‑engineered板材 to drive the high‑quality development of the advanced equipment sector.

Custom‑made a wide range of complementary panels, with comprehensive quality inspections; diverse panel options support high‑end equipment manufacturing.

In addition, we offer customized perforated and multi‑hole plates, equipment lining panels, and other complementary products. Thickness ratios and panel dimensions can be tailored to meet specific requirements, and each product is shipped with a comprehensive mechanical test report. Our diversified range of metal sheet products empowers the high‑end equipment manufacturing industry.