Top list of best-selling steel products from Union Steel Industry

Union Steel Industry’s best-selling steel products are driven by global standards compliance, stable supply capacity, and proven performance in oil & gas, energy, and industrial projects. The following product lines represent the highest demand across international markets.

1. API 5CT OCTG Casing & Tubing

Leading Grades & Specifications

Union Steel Industry supplies a full range of API 5CT casing and tubing, including:

J55 / K55 / N80 – Cost-effective grades for standard well depths and pressures

P110 / Q125 – High-strength grades designed for deeper wells and higher collapse resistance

Core Advantages

Seamless construction ensures uniform wall thickness and structural integrity

Precision-threaded connections provide secure, leak-tight joints

Full API 5CT compliance, including testing and certification

Primary Applications

Onshore and offshore oil & gas wells

Water wells and geothermal drilling

Why It’s a Best-Seller

API 5CT OCTG is Union Steel Industry’s most requested product line, supported by strong inventory, consistent quality control, and complete certification packages (MTC, API monogram).

2. Corrosion-Resistant Alloy (CRA) OCTG

Advanced Alloy Coverage

13Cr martensitic stainless steel

22Cr / 25Cr Duplex and Super Duplex alloys

Engineered to resist CO₂, H₂S, chlorides, and high-temperature corrosion.

Key Performance Features

Excellent resistance to pitting, crevice corrosion, and sulfide stress cracking

Maintains high mechanical strength in aggressive downhole environments

Typical Applications

Sour oil and gas fields

Deepwater offshore and HPHT wells

Geothermal and CCUS projects

Why It’s a Top Performer

CRA OCTG enables the development of corrosive and extreme reservoirs, significantly reducing failure risk and total lifecycle cost.

3. Industrial Pipe Flanges (ASME / EN Standards)

Product Range

Types: Weld Neck, Slip-On, Blind, Socket Weld, Threaded, Lap Joint

Standards: ASME B16.5, EN 1092-1

Materials: Carbon steel (A105), stainless steel (A182 F316), duplex alloys

Pressure ratings: Class 150 to 2500

Quality Highlights

Precision machining for reliable sealing and alignment

Optional complete flange kits with gaskets and fasteners

Full material traceability and documentation

Applications

Oil & gas pipelines and offshore structures

Refineries, chemical plants, power generation, shipbuilding

Why It’s a Core Product

Pipe flanges are indispensable components in industrial piping systems, ensuring continuous global demand and repeat procurement.

4. Pipe Spool Fabrication Services

Integrated Fabrication Capability

Union Steel Industry provides end-to-end pipe spool fabrication, including:

Cutting, bending, welding, NDE, pressure testing

Surface treatment and coating

Carbon steel, alloy steel, stainless steel, and CRA materials

Project Advantages

Reduced on-site installation time and labor cost

Improved welding quality and safety under workshop conditions

Supports modular construction strategies

Key Sectors

Petrochemical and LNG plants

Offshore platforms and power plants

Shipbuilding and modular units

Why It Adds Value

Pipe spool fabrication transforms field complexity into predictable shop efficiency, improving project schedules, cost control, and accountability.

Why Global Buyers Choose Union Steel Industry

Multi-standard compliance: API, ASME, EN, and international norms

Complete documentation: MTCs, inspection reports, third-party certifications

Global logistics capability: Reliable delivery to ports and project sites worldwide

Technical collaboration: Engineering support for material selection and application optimization

Union Steel Industry — Your Global Partner in Steel Solutions

Empower your next project with proven, best-selling steel products trusted across oil & gas, energy, and industrial markets worldwide.