Tenjan delivers fully customizable Cold-Rolled welded tubes in both standard round and specialized profiles. Our engineered solutions adapt to your exact application requirements. Application-Optimized Solutions We tailor: ✓ Material properties - Carbon steel, alloy grades & mechanical performance ✓ Dimensional precision - Tight tolerances to ±0.05mm ✓ Profi
Custom Sizes OD10-108mm – ASTM/EN/DIN/JIS/GOST Certified – Small-Batch Friendly
| Parameter | Key Features |
| Outer Diameter | 10-108mm (0.39″-4.25″) • Fully customizable |
| Wall Thickness | 1-6mm (0.039″-0.24″) • ±0.1mm precision tolerance |
| Materials | Carbon Steel • Alloy Steel • Special grades available |
| Process | Cold Drawn & Cold Rolled for superior finish |
| Standard | Typical Grades We Supply |
| GB | Q195,10#,20#,Q235 |
| ASTM | A366,1010,1020,A105 ,A36,1026 |
| EN | FeP01,C20,E235,S235JR |
| DIN | ST12,CK10,C10,CK20,C20,St37-2 |
| JIS | SPCC,S10C,STKM11A,S20C,STKM12,STKM13,SS400 |
| GOST | 10,20,Ст3сп |
| Standard | Typical Grades We Supply |
| GB | 16Mn,Q345B(Q355B),Q345C(Q355C),Q345D(Q355D),Q345E(Q355E) |
| ASTM | Gr·50,Gr·55 |
| EN | E355 |
| DIN | ST52,S355JR,S355JO,S355J2,S355NL |
| GOST | 15Г2,09Г2C,10Г2C1,C355 |
| Other Speical Grades can be customized | |
| Industry | Key Applications Parts | Relevant Standards | Our Advantages |
| General Manufacturing& Precision Components | Construction scaffolding,Warehouse racks,Motorcycle frames,Seat frames | GB/T 3091-2015 | Good Surface,lightweight,precision dimensions (±0.1mm) |
| Automotive and Motorcycle Component,Agricultural Machinery | Agricultural equipment,Conveyor systems,Brake tubes,Shock absorbers | EN 10305-2:2016 | High fatigue strength,High yield strength,lightweight,precision dimensions (±0.1mm) |
| General Manufacturing& Precision Components | Retail displays,Ventilation ducts,Drive shafts,Sprockets | ASTM A513-18 | ID/OD tolerances of ±0.05mm.Wall thickness uniformity straightness ≤0.5mm/m |
| Machinery,Automotive | Machine frames,Cargo carts,Turbocharger tubes,Engine mounts | DIN 2393-1:2022 | Enhanced material density through cold-drawing/rolling ensures long-term stability Full Compliance with Int’l Standards,Superior Creep & Fatigue Resistance |
| Construction Structures,Automotive | Construction joints,Temporary structures,Fuel rails,Swingarms | JIS G3445:2021 | Good Surface, lightweight,precision dimensions (±0.1mm),Super Surface |
| General Manufacturing& Precision Components | Road barriers,Prefab buildings,Exhaust pipes,Bumpers | GOST 10705:2020 | Arctic grade,GOST certification |
Tailored Features · Designed Exclusively for Your Needs
Cost-Effective Custom Carbon & Alloy Steel Solutions – 10% Procurement Savings Strategic Mill Partnerships:
Working with Baosteel, Xingcheng, and Shagang, we provide:
✓ 100+ Steel Grades – Custom carbon & alloy compositions
✓ Tailored Properties – Yield strength 200-1200 options
✓ Industrial-Grade QC – Full material certification & testing
Fully Automated Normalizing Furnace Precision Heat Treatment for Superior Tube Quality
Tenjan’s fully automated normalizing furnace delivers unmatched consistency in heat treatment, with ±2°C temperature control to optimize:
✓ Tensile & Yield Strength – Meet ASTM/EN/JIS standards
✓ Elongation & Hardness– Precise mechanical properties
✓ Metallurgical Structure– Uniform grain refinement
High-Precision Straightening Systems for Cold-Rolled Welded Tubes/PipesNext-Generation Straightening Technology
Tenjan’s proprietary straightening systems combine advanced equipment with 20+ years of expert craftsmanship to deliver:
Ultra – Precision Straightness ≤0.5mm/m (4X more accurate than conventional machines)
30% Faster Machining – Optimized for CNC lathe processing
Equipment Protection – Reduces machine wear & maintenance costs by 40%
Advanced Dual NDT Inspection for Cold-Rolled Welded Tubes/Pipes Comprehensive Quality Control for Demanding Applications
Our dual NDT inspection system integrates ultrasonic and eddy current testing to ensure:
High-Sensitivity Flaw Detection – Identifies defects as small as 0.02mm
Complete Coverage – 12-probe array for full ID/OD inspection
Dimensional Accuracy – Simultaneously measures OD (±0.05mm) and wall thickness (±3%)
Annealing represents a crucial delivery condition for precision steel tubes, commercially designated as GBK（+A） condition. Annealed Steel Tubes in GBK condition constitute a specialized category of precision steel pipes that have undergone complete annealing treatment after cold forming processes. These stress-relieved seamless tubes are manufactured accordi
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Cold-Drawn Seamless Steel Pipes, also known as precision-drawn tubes or cold-finished seamless pipes, represent our high-precision product line manufactured through advanced cold-drawing technology. These precision cold-drawn tubes are produced by drawing seamless steel billets through precision dies at room temperature, resulting in superior dimensional acc
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Cold Finished and Stress-Relieved Steel Pipes (BKS/+SR Condition) represent a precision delivery state where steel tubes undergo specialized stress relief annealing after cold forming processes. These stress-relieved seamless tubes effectively eliminate residual internal stresses from cold working while preserving the high dimensional accuracy and partial st
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Cold Finished (hard) Steel Pipes (BK/+C) represent a delivery state where steel tubes undergo cold forming processes without subsequent heat treatment. These hard-condition seamless tubes maintain their as-cold-worked properties, featuring high strength and precise dimensional characteristics that make them suitable for applications requiring rigid component
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