Carbon Steel Square & Rectangular Tube Supplier
Bao Steel supplies carbon steel square tube and rectangular tube for structural frames, machinery fabrication, construction projects, racks, trailers, equipment bases, fencing, platforms and general steel distribution. Send your tube size, wall thickness, length, grade, standard, surface treatment, quantity and destination so we can check stock, production route, cutting, MTC, bundle packing and shipment details before quotation.
Choose Square Tube or Rectangular Tube by Load, Frame Design and Fabrication Use
Square and rectangular tube purchasing should confirm section size, wall thickness, corner condition, straightness, weld seam route, length, surface treatment and packing method. These details directly affect fabrication accuracy and project installation.
Carbon Steel Square Tube
For frames, racks, posts, machinery bases, fencing, supports and general structural fabrication.
Request Square Tube Quote →Carbon Steel Rectangular Tube
For beams, frames, trailers, platforms, equipment structures and applications requiring directional strength.
Request Rectangular Tube Quote →Custom Cut Length Tube
For buyers who need fixed length tubes to reduce local cutting work, waste and fabrication time.
Review Cutting Support →Bundle Export Packing
For export orders requiring steel straps, labels, end protection, shipping marks and loading photos.
Review Packing Details →Square Tube Orders Need Size, Wall Thickness and Fabrication Details
Many square and rectangular tube disputes come from vague size descriptions, wrong wall thickness, unsuitable length, poor bundle packing or surface condition mismatch. A workable quotation should start from the actual frame design and end-use.
Section Size
Confirm square size or rectangular width × height, wall thickness, length and tolerance instead of only sending a general tube name.
Grade and Standard
Confirm ASTM A500, EN 10219, EN 10210, JIS, GB or buyer-specified standard, plus MTC acceptance.
Surface Condition
Black surface, oiled, painted, anti-rust coating or galvanized route should match indoor, outdoor or fabrication use.
Bundle and Loading
Export packing should confirm bundle weight, steel straps, labels, end protection, shipping marks and unloading method.
Common Standards for Carbon Steel Square and Rectangular Tube
Different standards are used for different markets and project requirements. Before quotation, confirm whether the buyer requires a structural tube standard, regional standard, project grade or general commercial tube route.
| Standard / Route | Common Buyer Requirement | Typical Product Form | Quotation Check Point |
|---|---|---|---|
| ASTM A500 | Carbon steel structural tubing for construction and structural applications. | Square tube, rectangular tube and round structural tube. | Confirm grade, section size, wall thickness, length, tolerance and MTC requirement. |
| EN 10219 | Cold formed welded structural hollow sections for steel structures. | Square hollow section, rectangular hollow section and circular hollow section. | Confirm grade such as S235, S275 or S355 route, dimensions, tolerances and project document requirement. |
| EN 10210 | Hot finished structural hollow sections where project documents require hot finished route. | Square, rectangular and round hollow sections. | Confirm whether hot finished tube is mandatory and do not substitute with cold formed tube without approval. |
| JIS G3466 | Japanese standard carbon steel square and rectangular tubes for general structure. | Square and rectangular hollow sections. | Confirm JIS grade, section size, wall thickness, length and certificate requirement. |
| GB / Q235 / Q355 Route | Chinese standard structural tube supply for fabrication, construction and general steel projects. | Square tube and rectangular tube in stock or production route. | Confirm whether buyer accepts GB documents, Q235 or Q355 route, and whether substitution is allowed. |
| Commercial Tube Route | General tube for frames, racks, fences, light structures, equipment supports and resale stock. | Black, oiled, painted or galvanized square and rectangular tube. | Confirm application, size, wall thickness, length, surface, packing and destination before pricing. |
Carbon Steel Square / Rectangular Tube Specification Details
Complete specification details help avoid wrong wall thickness, unsuitable standard, incorrect length, poor fit-up during fabrication and packing damage during export shipment.
Core Tube Specification
- Product TypeCarbon steel square tube, rectangular tube, structural hollow section or commercial tube
- StandardASTM A500, EN 10219, EN 10210, JIS G3466, GB route or buyer-specified project standard
- GradeQ235, Q355, ASTM A500 grades, S235 / S275 / S355 route or project-required grade
- SizeSquare size or rectangular width × height, wall thickness and length
- LengthFixed length, random length, custom cut length or project loading length requirement
- Shape DetailsCorner condition, weld seam route, straightness, end condition and tolerance requirement
Surface, Processing and Export Details
- SurfaceBlack surface, oiled, painted, anti-rust coating or galvanized route by request
- ProcessingCutting, drilling, punching, welding preparation, marking, painting and bundle preparation
- InspectionDimension check, wall thickness check, surface check, straightness check and third-party inspection by request
- DocumentsMTC, heat number, packing list, commercial invoice, certificate of origin and inspection support
- PackingBundle packing, steel straps, end protection, labels, shipping marks and loading photos
- DestinationDestination country or port, trade term, unloading condition and required shipment schedule
Tube Stock, Section Check, Cutting, Surface and Export Packing
Square and rectangular tube photos help buyers review stock condition, tube section, wall thickness, surface condition, cutting support, bundle labels and export readiness before shipment.
Square Tube Stock
Square tube stock can be reviewed by section size, wall thickness, surface condition, bundle labels and available quantity.
Rectangular Tube Stock
Rectangular tube is commonly selected for frames, beams, supports and applications requiring directional strength.
Tube Bundle Stock
Bundle photos help confirm storage condition, label details, bundle weight and handling readiness before shipment.
Section and Wall Thickness
Section photos help buyers check tube shape, wall thickness, corner condition and weld route before order confirmation.
Size and Thickness Check
Dimension inspection helps confirm width, height, wall thickness, tolerance and length consistency before dispatch.
Cut-to-Length Support
Custom cutting can reduce local fabrication work when buyers need fixed lengths for frames or assembly parts.
Common Uses of Carbon Steel Square and Rectangular Tube
The final application decides the tube grade, wall thickness, length, surface treatment and packing method. Send the application with your RFQ so the quotation can match the real fabrication requirement.
Structural Frames
For steel frames, columns, beams, trusses, roof supports, platforms and general structural fabrication.
Machinery and Equipment
For machine bases, equipment frames, guards, supports, transport frames and welded assemblies.
Racks, Fencing and Posts
For warehouse racks, fences, posts, gates, railings, display frames and commercial tube structures.
Trailers and Fabrication Parts
For trailer frames, vehicle-related structures, brackets, cross members and cut-to-length fabrication parts.
Surface Treatment, Bundle Packing and Loading for Export Orders
Square and rectangular tube export orders should protect tube ends, surface condition, bundle stability and labels. Long-length bundles also need loading plan review before shipment.
Surface Treatment
Black surface, oiled, painted, anti-rust coating or galvanized route can be reviewed by project environment.
Structural Frame Use
Application photos help confirm tube size, wall thickness, grade and fabrication route before quotation.
Bundle Export Packing
Bundle packing, steel straps, labels, end protection and shipping marks can be confirmed before dispatch.
Loading and Shipment
Loading photos help confirm bundle condition, tube marks, handling method and container or truck loading readiness.
What You Can Confirm Before Placing a Square Tube Order
The right tube should match the section size, wall thickness, grade, standard, length, surface treatment, fabrication use and export packing method. These details help reduce wrong material selection and installation problems.
Size Route Review
You can send square or rectangular size, wall thickness and length so we can review stock or production route.
Fabrication Fit Check
You can confirm straightness, end condition, corner condition, drilling, cutting and welding preparation needs.
Quality Documents
You can request MTC, heat number, tube labels, inspection record, packing list and loading photos.
Export Packing
You can confirm bundle packing, steel straps, labels, end protection, shipping marks and loading method.
Common Questions from Carbon Steel Square Tube Buyers
What information should I send for a square or rectangular tube quotation?
Send tube shape, size, wall thickness, length, grade, standard, surface treatment, quantity, packing requirement, destination port and required delivery schedule.
What is the difference between square tube and rectangular tube?
Square tube has equal width and height, which is often used for posts, frames and general structures. Rectangular tube has different width and height, which is often selected when directional strength or frame design requires a specific section.
Can you cut square tube to fixed length?
Cut-to-length service can be reviewed according to size, wall thickness, length tolerance, quantity and packing requirement.
Can the tube be painted, oiled or galvanized?
Black surface, oiled surface, painted surface, anti-rust coating and galvanized route can be reviewed according to application, storage condition and project environment.
Can you provide MTC and loading photos?
MTC, heat number, tube labels, packing list, commercial invoice, certificate of origin, loading photos and shipping marks can be discussed according to order requirements.
Related Steel Pipe, Tube and Export Support Pages
You can review related pipe categories, coating options, structural steel pages and export support pages before sending your RFQ.
Send Your Carbon Steel Square / Rectangular Tube Inquiry
Send tube shape, size, wall thickness, length, grade, standard, surface treatment, processing request, quantity, packing requirement and destination details. We will check stock, production route, processing feasibility, MTC, export packing and quotation details.
Direct Contact
For Faster Quotation, Please Include
- ✓Tube shape: square tube, rectangular tube or structural hollow section.
- ✓Standard, grade, width × height, wall thickness, length and tolerance.
- ✓Surface treatment, cutting request, bundle packing and inspection requirement.
- ✓Quantity, destination port, trade term and required delivery schedule.
Document Support
- MTC
- Heat Number
- Tube Labels
- Packing List
- Commercial Invoice
- Certificate of Origin
- Loading Photos
- Shipping Marks
Steel Inquiry Form
Use this form for carbon steel square tube, rectangular tube, structural hollow section, carbon steel pipe and other steel product inquiries.
