Shapes & Profiles

Square&Rectangular pipes

Square and rectangular seamless steel tubes in carbon and alloy grades. Share profile dimensions, wall thickness, tolerances and drawings with Tenjan.

Custom grades & dimensionsFull quality traceabilityGlobal standards support

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Product details

Product Description

These High-Strength Rectangular Pipes demonstrate outstanding resistance to bending and torsion, significantly reducing structural weight while saving substantial steel material. Manufactured through advanced Cold-Drawing Technology, our Surface-Finished Steel Tubes maintain flawless integrity during bending operations without cracking or fracture.

Backed by three decades of technical expertise, we provide comprehensive customization including Standard Square Tubes, Rectangular Hollow Sections, Outer-Square Inner-Round Tubes, and Outer-Rectangular Inner-Oval Pipes. All Customizable Hollow Sections are available in tailored dimensions, materials (including Carbon Steel Pipes and Alloy Steel Tubes), and precision grades to meet specific OEM requirements.

Ideal for Automotive Components, Boiler Systems, and Agricultural Machinery, our tubes offer customizable mechanical properties including tensile strength, elongation, yield strength, hardness, and specialized R-angle configurations. Trust our Galvanizing-Ready Tubes and Custom Mechanical Properties Tubes for your most demanding structural applications.

Precision Shaped Seamless Alloy Steel Tubes for Industrial Applications

Custom Sizes OD10-108mm-ASTM/EN/DIN/JIS/GOST Certified -Small-Batch Friendly

Technical data

Product Specifications

Parameter	Key Features
Outer Diameter	10-108mm (0.39″-4.25″) • Fully customizable
Wall Thickness	1-20mm (0.039″-0.79″) • ±0.1mm precision tolerance
Material	Carbon Steel • Alloy Steel • Special grades available
Process	Cold Drawn Cold Rolled for superior finish

Available materials

Shaped Seamless Steel Tube&Pipe - Steel Grade Availability

Standard	Typical Grades We Supply
GB	DT4,Y15,10#,20#,20G,Q235,25Mn,35#,45#,55# 16Mn,Q345B(Q355B),Q345C(Q355C),Q345D(Q355D),Q345E(Q355E),Q420,Q460,20Cr,40Cr, 15CrMo,20CrMo,30CrMo,35CrMo,42CrMo,20CrNiMo,40CrNiMo,20CrMnTi,20Mn2,40Mn2,40MnB,35MnB, 35Mn15CrMn,20CrMn,20CrMnMo,38CrMoAL,36Mn2V,38Mn2V,40MnMoV,15Mo3,16Mo3,31CrMoV9
ASTM	1215,1008,1010,1020,A105,A106 Gr.B,A36,1026,1035,1045,1055,SA179,SA192 Gr·50,Gr·55,Gr·65,5120,5140,4130,4135,4140,8620,4340,SAE 5120,1524,1340,15B41,SAE5115,SAE 5120,SCM23
EN	DC01,11SMn30,P235TR1,P195GH,P265TR2,E235 E355,ST52,S355JR,S355JO,S355J2,S355NL,S420N,S420NL,S460NL,20Cr4, 41Cr4,13CrMo4-5,20CrMo4,25CrMo4,34CrMo4,42CrMo4,20NiCrMo2,34CrNiMo6,20MnCr5, 22Mn6,42Mn6,42MnB4,34MnB5,37Mn5,16MnCr5,20CrMo5.
JIS	SUM22,S10C,STKM11A,STPT370,STB35,S20C,STKM12,STKM13,STPT410,STB42,SS400,S35C,S45C,S55C SCr22,SCr440,SCM415,SCM420,SCM430,SCM435,SCM440, SNCM220,SNCM439,SMnC420H,SMn420,SMn438, SMnC420H
DIN	DC01,11SMn30,CK10,C10,ST35.8,C20,CK20,ST45.8,St37,S235JR,C26D,CK35,CK45,CK55
GOST	08КП,10,20,Ст3сп,25,35,45,5515Г2, 09Г2C/10Г2C1,15Г2,14Г2С,C355,20Х,40X,15XM,20ХМ,30ХМ,35ХМ,38ХМ,20ХНМ,40ХНМ,20ХГТ,20Г2,40Г2,18ХГ,20ХГМ
Other Speical Grades can be customized

Applications

Industry-Specific Solutions

Industry	Key Applications Parts	Relevant Standards	Our Advantages
General Structural	Square Rectangular Tubes	GB/T 3094,ASTM A500, EN 10210	Good Surface,lightweight,precision dimensions (±0.1mm)
Automotive and Motorcycle Component	Shock Absorbers，Steering Systems，Thrust Rods	EN 10305-1,JIS G3445, DIN 2391,ASTM A519	High fatigue strength,High yield strength,lightweight, precision dimensions (±0.1mm)
Engineering and Mining Support	Anchor Bolts,Support Pipes,Hydraulic Props	ASTM A519,DIN 2391, JIS G3441,EN 10297-1, ISO 10799	High Strength Yield Strength High Elongation Customization Service – Special steel grades, dimensions and surface treatments available according to project requirements
Construction Machinery	Drive shaft sleeves,Gearbox Guide Tubes,Crane Boom Guide Tubes,Excavator Arm Tubes,Loader Frame Tubes,Arctic Low-Temperature Tubes	ASTM A519,DIN 2391, JIS G3445,EN 10210-1, GOST 8733, ASTM A106,ISO 9329	ID/OD tolerances of ±0.05mm. Wall thickness uniformity straightness ≤0.5mm/m
Fluid Transport Systems	Oil/Gas pipelines,chemical systems,Power/Energy	ASTM A106 Gr.B, EN 10216-2,GOST 8734	Eddy Current + Ultrasonic Testing,Hydrostatic Testing
High-Pressure Boilers	Superheaters,Steam lines,Reheaters,Economizers)	ASTM A192,DIN 17175, EN 10216, JIS G3461/G3462	Enhanced material density through cold-drawing/rolling ensures long-term stability Full Compliance with Int’l Standards,Superior Creep Fatigue Resistance
Geological Drilling	Drill Pipe,Tubing	ASTM A519,API 5DP, EN 10208-2	High Strength Wear Resistance precision Dimensions Impact Fatigue Resistance
Agricultural Machinery	Hydraulic cylinders,drive shafts,Lift arms,steering housings,Boom frames	ASTM A519,EN 10210-1, DIN 2391,GOST 8733, JIS G3445	Material Advantages:High Strength Lightweight,Precision Cold-Drawing Technology,Dimensional accuracy ±0.05mm
Petroleum Cracking Units	Reformer Tubes,Heat Exchanger Tubes,Reactor Feed Pipes,Transfer Lines,Quench Oil Pipes	ASTM A335,ASTM A213, EN 10216-2	Optimized Material Purity,Precision Dimensional Control,Customized Solutions

Why choose us

Custom Advantages

Tailored Features · Designed Exclusively for Your Needs

Custom-Shaped Steel Tubes – Precision Hex, Rectangular, D-Shaped & More for Industrial ApplicationsComplex Cross-Section Expertise:

We specialize in precision-engineered steel tubes with custom profiles including:

✔ Standard Shapes: Hexagonal, rectangular, square, oval

✔ Specialty Profiles: D-shaped, lemon-shaped, triangular

✔ Full Customization: Tailored to your exact CAD specifications

Industry Applications: Automotive, Industrial Machinery, Agricultural Machinery, Hydraulic Systems

Special-Shaped Steel Tube Engineering – Custom Solutions for Automotive, Hydraulic and Industrial Applications

Our 11+ member engineering team brings 30+ years of combined expertise in developing precision special-shaped tubes for:

✔ Automotive: Lightweight structural components, exhaust systems

✔ Hydraulics: High-pressure manifolds, precision connectors

✔ Industrial Equipment: Conveyor guides, machinery frames

✔ Energy: Heat exchanger tubing, boiler components

Precision Custom Alloy Steel Tubes – Material, Inspection and Delivery Planning Material Sourcing Review:

Collaborating with Baosteel, Xingcheng, and Shagang, we provide:

✔ 100+ Custom Alloy Grades –Tailored chemistry
(C, Cr, Mo, Ni adjustments)

✔ Engineered Properties – Yield strength 350-1200MPa customization

✔ Industrial-Grade QC – Full-spectrum testing (UT, hardness, dimensional)

Value Proposition:

✔ Project-Specific Cost Review – Compare grade, order quantity and downstream processing requirements

✔ Technical Consultancy– From material selection to application

✔ Consistent Quality – Confirm batch traceability and acceptance requirements

Heating and Normalizing Review for Precision Shapes Steel PipesHeating and Delivery Condition Review:

Review billet heating requirements and the agreed normalizing condition to address:

✓ Cracks ✓ Surface scaling ✓ Wall thickness variation

Normalizing requirements to confirm:

✔ ±2°C temperature control– Confirm the temperature-control requirement

Mechanical Property Review– Specify the required strength and delivery condition

Batch Consistency Checks– Confirm material identification and test records

Industry Applications:

Oil & Gas, Automotive, Energy, Hydraulic Systems