News & Updates

New Stainless Steel 316L Inventory Arrived

We are pleased to announce the arrival of a significant new shipment of 316L stainless steel products at our Shanghai warehouse. The inventory includes large-diameter seamless pipes (up to 24" OD) and heavy-gauge plates (up to 50mm thickness), all compliant with ASTM A312 and ASTM A240 specifications.

This restock is in direct response to growing demand from the chemical processing, marine, and oil & gas sectors. All materials are in stock and available for immediate delivery, with full MTC 3.1 certification included. Contact our sales team for pricing and availability on specific dimensions and quantities.

ISO 9001:2015 Certification Renewed

Jiangsu Ranboyu Metal Products Co.,Ltd has successfully completed its annual quality management system audit and renewed its ISO 9001:2015 certification. The rigorous audit was conducted by an independent third-party certification body and covered all aspects of our operations — from raw material procurement and manufacturing processes to final inspection, documentation, and customer service.

This renewal confirms that our quality management processes continue to meet the most stringent international standards, giving our customers confidence in the consistency and reliability of every Jiangsu Ranboyu Metal Products Co.,Ltd product.

Copper & Carbon Steel Lines Expanded

We have significantly expanded our copper and carbon steel product lines, adding over 25 new carbon steel grades and substantially broadening our copper product range. New carbon steel additions include high-strength alloy steels (4130, 4140, 4340), pressure vessel grades (A516 Gr.70), and structural grades (S355JR, S355J2).

On the copper side, we've added C11000 electrolytic tough pitch copper in additional forms and sizes, expanded our brass offerings (H62, H65, H68), and introduced new bronze grades for marine and industrial bearing applications.

New Export Markets: Middle East & Southeast Asia

Jiangsu Ranboyu Metal Products Co.,Ltd is proud to announce the expansion of our export network into the Middle East and Southeast Asia. We have established new logistics partnerships and warehousing arrangements in key regional hubs including Dubai (UAE), Dammam (Saudi Arabia), Bangkok (Thailand), and Jakarta (Indonesia).

These new routes enable faster delivery times, reduced freight costs, and improved local support for customers in these rapidly growing industrial markets. Initial shipments of stainless steel, carbon steel, and copper products are already in transit.

Guide: Choosing the Right Stainless Steel Grade

Selecting the optimal stainless steel grade for your application requires balancing corrosion resistance, mechanical properties, fabrication requirements, and cost. Our engineering team has published a comprehensive technical guide covering the key factors in grade selection.

Topics covered include: understanding the role of chromium, nickel, and molybdenum in corrosion resistance; comparing 304 vs 316 for different environments; when to choose duplex grades over austenitic; and guidelines for welding, forming, and heat treatment of common stainless grades.

Key takeaways:

• 304/304L: Best all-around choice for general applications with mild corrosive exposure
• 316/316L: Superior pitting resistance for marine, chemical, and coastal environments
• 2205 Duplex: Twice the strength of 304/316 with excellent chloride SCC resistance — ideal for offshore
• 904L: Premium choice for sulfuric acid and severe chemical service
• 17-4PH: High strength + good corrosion resistance for aerospace and pump shafts