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Tianjin Sanon Steel Pipe Co., Ltd. is a stockist. Our stock factory is in Cangzhou City, Hebei Province. Our main sources of goods are boiler pipes, and the representative materials are ASTM A335 P5/P11/P91/P92, ASME SA-106/SA-106M GR.B, GB/T 3087-2008 10#/20#. The representative materials of pipeline pipes are API 5L, API 5CT, the representative materials of petroleum cracking pipes GB/T 9948 are 15MoG/12CrMoVG. GB/T 6479-2013 represents the material 10#/20#, heat exchanger tubes SA179/SA210/SA192, etc., mechanical tubes GB/T 8162 represent the material 10#/20#/Q345/42CrMo, EN10210 represents the material S355JOH/S355J2H, gas cylinder tubes GB1 8248, represent the material 34CrMo4/30CrMo.
The European market for precision steel tubes continues to grow, while EU import policies and the Carbon Border Adjustment Mechanism (CBAM) are evolving rapidly. Below is our market update on EN 10305-3 welded cold sized steel tubes, for the reference of European customers.
1. Market Overview & Applications
EN 10305-3 is a core European standard for precision steel tubes. The latest version is EN 10305-3:2023. This standard applies to welded cold sized circular, square and rectangular steel tubes with outside diameter ≤ 193.7mm, characterized by strict dimensional tolerances and specified maximum surface roughness.
Key Features:
OD tolerance as tight as ±0.12mm (includes out-of-roundness)
Wall thickness tolerance: ±0.15mm for T≤1.5mm; ±10% or ±0.35mm (whichever is smaller) for T>1.5mm
Surface roughness Ra ≤ 4μm
Straightness ≤ 0.002 × L
Typical Applications:
Automotive Components: Steering columns, drive shafts, airbag systems, chassis parts
Mechanical Engineering: Hydraulic cylinders, conveyor rollers, precision parts
Furniture Manufacturing: Telescopic profiles, office furniture structural parts
HVAC Systems: Central heating pipes, greenhouse heating systems
Agricultural Machinery: Agricultural equipment parts
Material Grades & Delivery Conditions: The standard covers multiple steel grades from E155 to E700. Higher strength grades are available for demanding applications. Delivery conditions include:
+CR1 (Cold sized, may be annealed)
+CR2 (Cold sized, not intended for heat treatment)
+A (Annealed in controlled atmosphere)
+N (Normalized in controlled atmosphere)
2. European Import Policies & CBAM
The EU is reshaping the steel supply chain through multiple policies:
CBAM (Carbon Border Adjustment Mechanism): Entered substantive implementation phase in 2026. Importers must purchase CBAM certificates for embedded emissions
Safeguard Measures: Steel import quotas continue to tighten
Low-Carbon Trend: EU requirements for imported steel carbon footprint are becoming increasingly strict
3. Supplier Landscape Analysis
Production Status in China:
EN 10305-3 production capacity is concentrated in Tianjin, Hebei, Jiangsu and other regions
The core technical requirement is the cold sizing process – ordinary welded pipe mills without this process cannot meet standard precision requirements
Certification requirements: Automotive customers typically require IATF 16949 certification; EN 10204 3.1 certificates are required for precision tubes
Domestic Supplier Types:
Large precision tube manufacturers: Clear production capability and stable export experience
Medium-sized professional mills: Can produce EN 10305-3 standard products with annual capacity ranging from thousands to tens of thousands of tons
Small precision tube mills: Focus on niche markets with high flexibility but limited capacity
European Local Suppliers:
Major Western European steel groups with complete precision tube product lines and advanced online galvanizing technology
European specialist precision tube manufacturers covering circular, square and rectangular tube specifications
Emerging Eastern European manufacturers with cost advantages gradually entering Western European markets
Major European stocking distributors maintaining large EN 10305-3 inventory for fast delivery
4.Technical Requirements of EN 10305-3 Precision Tubes
Why is EN 10305-3 considered "precision" rather than standard structural tubes? The key differences are:
Key Production Control Points:
Raw material must be fully killed steel for uniform composition
External weld must be ground flush with the parent metal surface
+A/+N conditions require heat treatment in controlled atmosphere
+CR2 condition prohibits any subsequent heat treatment
Our Supply Capability
We have extensive export experience to the European market and can provide:
EN 10204 3.1 Inspection Certificates (available with every batch)
Carbon Footprint Data (to support CBAM compliance)
Stable Logistics Routes (Antwerp port and other major European ports)
Close Cooperation with IATF 16949 Certified Mills
Supply Range:
Round tube OD: 10mm - 193.7mm
: as per customer requirements
Wall thickness: 0.6mm - 6mm
Materials: DX51D+Z / E235 / E355 / etc.
Zinc coating: Z275 (275g/m² both sides)
European customers with EN 10305-3 precision steel tube requirements are welcome to connect. We can provide complete technical documentation, quality plans, and carbon footprint data support.
Post time: May-28-2026
