ASTM A500 Grade C Cold-Formed Seamless Square Steel Tubing for Railway Construction
Basic Properties
Place of Origin:
China
Brand Name:
Torich
Certification:
ISO 9001:2008 , TS16949 , ABS , CCS , DNV , GL
Model Number:
Seamless Square and Rectangle
Trading Properties
Minimum Order Quantity:
5MT
Price:
800-1000 USD/Tons
Payment Terms:
L/C,T/T
Supply Ability:
7000MT/Month
Product Summary
Railway Constructions Cold Formed Seamless Steel Square Tubing ASTM A500 Product Overview ASTM A500 cold-formed seamless square steel tubing is designed for load-bearing structural assemblies requiring uniform section geometry, predictable yield strength, and reliable welded or bolted connections. ...
Product Details
Highlight:
structural steel square tubing
,rectangular steel pipe
Product:
Cold-formed Seamless Square Structural Steel Tubing
Primary Standard:
ASTM A500/A500M
Main Grades:
Grade A, Grade B, Grade C, Grade D
Section Shape:
Square; Rectangular Sections Available On Request
Square Outside Dimensions:
20 × 20 Mm To 500 × 500 Mm
Rectangular Outside Dimensions:
20 × 30 Mm To 400 × 600 Mm
Wall Thickness:
1–24 Mm
Length:
1–12 M; Fixed, Random, Or Cut-to-length Supply
Product Description
Railway Constructions Cold Formed Seamless Steel Square Tubing ASTM A500
Product Overview
ASTM A500 cold-formed seamless square steel tubing is designed for load-bearing structural assemblies requiring uniform section geometry, predictable yield strength, and reliable welded or bolted connections. For railway infrastructure, it is primarily used in stationary structures such as railway station canopy support columns, where dimensional consistency, straightness, corner quality, and material traceability directly affect fabrication accuracy and structural performance.
ASTM A500/A500M covers cold-formed welded and seamless carbon steel structural tubing in round, square, rectangular, and special shapes. The specification applies to structural members used in welded, riveted, or bolted construction. ASTM A500 Grade C is generally the preferred grade for square structural tubing because it provides a minimum yield strength of 345 MPa and a minimum tensile strength of 425 MPa.
A500 tubing should not automatically be selected for dynamically loaded railway components. Where fatigue loading, low-temperature notch toughness, or mandatory Charpy impact performance is involved, the project engineer should evaluate ASTM A1085, ASTM A1110/A1110M, or another impact-tested structural specification.
Technical Specifications
| Item | Available Specification |
|---|---|
| Product | Cold-formed seamless square structural steel tubing |
| Primary standard | ASTM A500/A500M |
| Main grades | Grade A, Grade B, Grade C, Grade D |
| Recommended structural grade | ASTM A500 Grade C |
| Manufacturing route | Seamless tube production followed by cold forming and dimensional calibration |
| Section shape | Square; rectangular sections available on request |
| Square outside dimensions | 20 × 20 mm to 500 × 500 mm |
| Rectangular outside dimensions | 20 × 30 mm to 400 × 600 mm |
| Wall thickness | 1-24 mm |
| Length | 1-12 m; fixed, random, or cut-to-length supply |
| ASTM dimensional envelope | Maximum perimeter: 2235 mm; maximum specified wall: 25.4 mm |
| Wall-thickness tolerance | According to ASTM A500; minimum actual wall generally not less than 90% of specified wall |
| Straightness | Maximum deviation approximately 2.1 mm per metre |
| Squareness | Controlled according to ASTM A500 requirements for shaped tubing |
| Corner radius | Outside corner radius generally not more than 3.0 times the specified wall thickness |
| Surface condition | Black, pickled, shot-blasted, oiled, phosphated, primed, or galvanized |
| Heat treatment | Normally supplied as cold formed; Grade D requires heat treatment |
| End condition | Plain, deburred, chamfered, or precision cut |
| Inspection documents | EN 10204 3.1 inspection certificate available |
| Testing | Chemical analysis, tensile test, dimensional inspection, visual examination, and flattening test where applicable |
| Optional inspection | Ultrasonic testing, magnetic-particle testing, impact testing, and third-party inspection |
Main Characteristics
High Section Efficiency: A square hollow section distributes material around the neutral axes more efficiently than many open sections. This provides strong resistance to bending and torsional deformation while maintaining a relatively low structural weight.
Defined Minimum Strength: For square and rectangular tubing, ASTM A500 Grade C specifies minimum yield strength of 345 MPa, minimum tensile strength of 425 MPa, and minimum elongation in 50 mm of 21%.
Controlled Straightness: The ASTM straightness limit is approximately 0.025 in. per foot of total length, equivalent to about 2.1 mm/m. Straightness control is important when several tubes must be aligned in long railway canopy columns or welded frame assemblies.
Cold-Formed Corner Strengthening: Cold forming introduces work hardening around the corners. The corner regions can therefore exhibit higher local yield strength than the flat faces.
Seamless Section Integrity: The seamless route eliminates a longitudinal ERW seam. This provides consistent section continuity around the full perimeter.
Our Technical Advantages
Material Traceability: Each production lot can be linked to its heat number, raw-material record, manufacturing route, and inspection results. The mill test certificate reports actual chemical composition, yield strength, tensile strength, elongation, and dimensional inspection data.
Quality Control: Our inspection plan includes comprehensive dimensional checks, straightness measurement, twist measurement, adjacent-side squareness, corner-radius measurement, and end-squareness inspection to reduce assembly problems.
Specification Guidance: We help select the correct railway specification based on static or cyclic loading, design temperature, Charpy V-notch energy requirements, welding procedures, corrosion category, and applicable railway authority specifications.
Execution Standards
| Standard System | Relevant Standard | Scope |
|---|---|---|
| ASTM | ASTM A500/A500M | Cold-formed welded and seamless carbon steel structural tubing in rounds and shapes |
| ASTM | ASTM A1085/A1085M | Cold-formed welded carbon steel HSS with tighter tolerances and additional performance requirements |
| ASTM | ASTM A1110/A1110M | Structural tubing with 360 MPa minimum yield strength and impact requirements |
| EN | EN 10210-1/-2 | Hot-finished structural hollow sections of non-alloy and fine-grain steels |
| EN | EN 10219-1/-2 | Cold-formed welded structural hollow sections |
| JIS | JIS G 3466 | Carbon steel square and rectangular tubes for general structures |
| GOST | GOST 8639 | Square steel tubes and dimensional requirements |
| GOST | GOST 30245 | Welded square and rectangular closed structural profiles |
| GB | GB/T 3094 | Cold-drawn shaped steel tubes, including square and rectangular sections |
| GB | GB/T 6728 | Cold-formed hollow structural sections |
Primary Application
Railway Station Platform Canopy Support Column: ASTM A500 Grade C seamless square tubing serves as the principal vertical support member in railway station platform canopies. The square section provides flat surfaces for connecting brackets and welded plates, efficient resistance to wind-induced bending, good torsional stability, consistent geometry for modular canopy fabrication, internal space for protected cable routing, and compatibility with hot-dip galvanizing or protective coating systems.
Chemical Composition
| Grade / Specification | C, max. % | Mn, max. % | P, max. % | S, max. % | Cu, min. % when copper steel is specified |
|---|---|---|---|---|---|
| ASTM A500 Grade A | 0.26 | Not specified | 0.035 | 0.035 | 0.20 |
| ASTM A500 Grade B | 0.26 | Not specified | 0.035 | 0.035 | 0.20 |
| ASTM A500 Grade C | 0.23 | 1.35 | 0.035 | 0.035 | 0.20 |
| ASTM A500 Grade D | 0.26 | Not specified | 0.035 | 0.035 | 0.20 |
| ASTM A1085/A1085M | 0.26 | 1.35 | 0.035 | 0.035 | As specified by the ordered revision |
Mechanical Properties
| Grade / Specification | Minimum Tensile Strength | Yield Strength | Minimum Elongation in 50 mm | Heat-Treatment Condition |
|---|---|---|---|---|
| ASTM A500 Grade A | 310 MPa | 270 MPa minimum | 25% | Cold formed |
| ASTM A500 Grade B | 400 MPa | 315 MPa minimum | 23% | Cold formed |
| ASTM A500 Grade C | 425 MPa | 345 MPa minimum | 21% | Cold formed |
| ASTM A500 Grade D | 400 MPa | 250 MPa minimum | 23% | Heat treated |
| ASTM A1085/A1085M | 450 MPa minimum | 345-485 MPa | 21% minimum | Cold formed welded HSS |
Product Gallery
Frequently Asked Questions
Are you trading company or manufacturer?
Manufacturer, also can do trading.
How long is your delivery time?
Generally speaking, it is 10-15 days if the goods are in stock, or it is 30-40 days if the goods are not in stock, according to quantity.
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Yes, we could offer the sample for free charge but need pay the cost of freight.
What is your terms of payment?
Payment ≤ 2000 USD, 100% in advance. Payment ≥ 2000 USD, 30% T/T in advance, balance before shipment. If you have another question, please feel free to contact with me.
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