We Super Steel Manufacturing Co.,Ltd(SMC) are amongst the top manufacturers and suppliers for the seamless steel pipe, welded steel pipe, OCTG products and fittings from China. We have been manufacturing and supplying these products to the industry since 1993, and received repeat orders and appreciation from our valued customers.
High quality piping products from approved manufacturers.
In order to continuously improve our offerings to our clients, we have consistently improved and upgraded our manufacturing facility and can hence offer material with stringent requirements.
Over the years, Super Steel Manufacturing Co.,Ltd(SMC) has developed an enviable reputation for project management for the Oil & Gas, Construction, Power Energy, Marine & Offshore, Water Treatment, Exploration & Drilling Services, Pipeline & Petrochemical and other heavy industries.
The many years of experience that we have means that there is always someone who has the ability to carry a project forward.
Always up to date. In this column you can find the steel pipe related articles, including industry trends, product standards and materials, and some technical guidelines.
Q620 straight seam welded steel pipe is a high-strength, high-toughness welded steel product widely used in oil and gas transportation, chemical processing, power generation, construction, and marine engineering. Known for its superior mechanical properties, corrosion resistance, and weldability, it plays a critical role in supporting modern industrial infrastructure.
Super Steel Manufacturing Co.,Ltd is professional welded steel pipes manufacturer, for more details, please contact:sales@super-steels.com
Key Features of Q620 Straight Seam Welded Steel Pipe
Q620 welded pipe is manufactured from high-strength low-alloy steel (HSLA) with a minimum yield strength of 620 MPa, delivering robust performance in extreme environments. The material incorporates trace elements such as niobium, vanadium, and titanium, and undergoes thermo-mechanical controlled processing (TMCP) for enhanced grain refinement and uniform microstructure.
1. High Strength & Toughness
Yield strength:≥620 MPa
Tensile strength:≥700 MPa
Maintains excellent impact resistance at low temperatures
Suitable for cold-region infrastructure and seismic zones
2. Excellent Weldability
Designed with low carbon equivalent (CE) for improved weldability
Ensures high joint strength and minimal heat-affected zone (HAZ) degradation
Compatible with automated and precision welding techniques
3. Superior Corrosion Resistance
Alloyed with copper, chromium, and nickel for increased resistance
Performs well in marine, chemical, and humid environments
Ideal for long-term service in offshore and coastal projects
Q620 Straight Seam Welded Pipe Manufacturing Process
The production of Q620 welded steel pipes involves precision engineering and strict quality control across all stages, from steel plate selection to final inspection.
1. Steel Plate Preparation
Made from Q620MD-grade plates produced via TMCP
Typical thickness: 6–40 mm, customized to pipe specifications
Raw materials tested for chemical composition and mechanical properties
2. Forming & Welding
Plates are milled, pre-bent, and shaped into cylindrical form
Welding methods:
High-Frequency Resistance Welding (HFW)–for thin-wall, high-efficiency production
Submerged Arc Welding (SAW)–for thick-wall pipes requiring deep penetration and strong seams
3. Heat Treatment & Straightening
Pipes undergo normalizing or tempering to eliminate residual stress
Final straightening ensures dimensional accuracy and roundness
4. Quality Inspection
Each Q620 pipe is subjected to comprehensive non-destructive testing (NDT) including:
Ultrasonic Testing (UT)
X-ray Testing (RT)
Hydrostatic Pressure Testing
Additionally, mechanical, dimensional, and corrosion resistance tests ensure full compliance with industry standards.
Applications of Q620 Straight Seam Welded Steel Pipe
Thanks to its high mechanical performance and excellent durability, Q620 welded pipe is ideal for:
Oil and Gas Pipelines
Used in high-pressure, long-distance pipelines such as the West-East Gas Pipeline and China–Russia East Route
Capable of withstanding complex terrain and harsh operating conditions
Chemical and Power Industries
Applied in boiler tubes, pressure vessels, and nuclear power systems
Handles high temperature and pressure environments with safety and reliability
Construction and Bridge Engineering
Serves as a structural pipe in high-rise buildings and large-span bridges
Reduces overall structural weight and improves earthquake resistance
Marine and Offshore Projects
Excellent performance in subsea pipelines, oil platforms, and coastal installations
Proven seawater corrosion resistance
Market Outlook and Future Development
The global demand for high-performance welded steel pipes continues to rise, driven by energy development, infrastructure upgrades, and green construction goals.
Development Advantages of Q620 Welded Pipe:
1. Policy Support
China's 14th Five-Year Plan promotes the use of high-end steel materials
Q620 aligns with goals of low carbon, energy efficiency, and material innovation
2. Technological Advancements
Modern automated welding lines and intelligent manufacturing systems have enhanced product consistency and cost-efficiency
3. Global Market Potential
With the Belt and Road Initiative, Q620 steel pipe sees increasing demand in overseas pipeline and infrastructure projects
Conclusion
Q620 straight seam welded steel pipe stands as a core material in modern industrial development, thanks to its high strength, toughness, corrosion resistance, and manufacturing reliability. As industries pursue more demanding applications, Q620 welded pipes are poised to meet the challenges of tomorrow—supporting infrastructure that is safer, stronger, and more sustainable.
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