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  • JIANGSU MITTEL STEEL INDUSTRIAL LIMITED
    Raian Ionescu
    Material quality very good. we have cooperate more than 10 Years. They trade lots kinds of steel material. All material quality good. They duty for all material quality. We are planing continue cooperate with them in the future
Contact Person : Gao Ben
Phone Number : 18068357371
Whatsapp : +8618068357371

Factory Supply S235JR S355JR Square Tube with Black Surface Treatment Size 40*40 - 500*500

  • Factory Supply S235JR S355JR Square Tube with Black Surface Treatment Size 40*40 - 500*500
  • Factory Supply S235JR S355JR Square Tube with Black Surface Treatment Size 40*40 - 500*500
  • Factory Supply S235JR S355JR Square Tube with Black Surface Treatment Size 40*40 - 500*500
  • Factory Supply S235JR S355JR Square Tube with Black Surface Treatment Size 40*40 - 500*500
  • Factory Supply S235JR S355JR Square Tube with Black Surface Treatment Size 40*40 - 500*500
  • Factory Supply S235JR S355JR Square Tube with Black Surface Treatment Size 40*40 - 500*500
Minimum Order Quantity 50 Tons
Price US $650-1,250 / Ton
Product Details
Section Shape Square Size Range 40*40 - 500*500
Thickness Range 1.2mm - 30.0mm Material Grades SS400, S235JR, S275JR, S355JR, 1020, 1045, 4140
Surface Treatment Black, Galvanized Or Painted Yield Strength 355 N/mm² (≤16mm)
Tensile Strength 510-680 N/mm² (d<3mm) Elongation 22% (3≤d≤40mm)
Carbon Content ≤0.24% (S355JR) Silicon Content ≤0.55% (S355JR)
Manganese Content ≤1.60% (S355JR) Phosphorus Content ≤0.035% (S355JR)
Sulfur Content ≤0.035% (S355JR) Copper Content ≤0.55% (S355JR)
Production Capacity 10,000MT/month
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S235JR S355JR Square Tube

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Black Surface Treatment Square Tube

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40*40 - 500*500 Square Steel Tube
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Product Description
Factory Supply S235JR S355JR Square Tubes

Available in stock sizes ranging from 40×40mm to 500×500mm with comprehensive material options and surface treatments.

Product Specifications
Product Type Size Range Thickness Length
Round Pipe OD 10mm - 1000mm 4mm - 30mm Custom lengths available
Square Pipe 10×10mm - 1000×1000mm 1.2mm - 30.0mm Standard and custom
Rectangle Pipe 20×40mm - 400×700mm 1.2mm - 30.0mm Standard and custom
L/T/Z Window Section 28mm/38mm 0.5mm - 1.5mm Standard profiles
Product Details
Material Grades

SS400, S235JR, S275JR, S355JR, 1020, 1045, 4140, and equivalent standards

Surface Treatment

Black, galvanized, or painted finishes available

Packaging

Export standard packing with bundles, seaworthy packaging, container shipment

Delivery & Logistics

Port: Shanghai, China
Lead Time: Within 30 days after deposit/L/C

Minimum Order Quantity: 10 Tons per size
Production Capacity: 10,000 MT per month
Main Markets: Europe, America, Africa, Southeast Asia
EN 10025 S355 Steel Technical Information

S355 structural steel offers superior mechanical properties compared to S235 and S275 grades, with enhanced yield strength and tensile strength characteristics.

S355 Steel Grade Designation
  • S - Structural steel designation
  • 355 - Minimum yield strength (N/mm²) for thickness ≤16mm
  • JR - 27J impact energy at 20°C
  • J0 - 27J impact energy at 0°C
  • J2 - 27J impact energy at -20°C
  • K2 - 40J impact energy at -20°C
Chemical Composition
Steel Grade C (%) Si (%) Mn (%) P (%) S (%) Cu (%) Deoxidation
S355JR ≤0.24 ≤0.55 ≤1.60 ≤0.035 ≤0.035 ≤0.55 Rimmed steel not allowed
S355J0 ≤0.20 ≤0.55 ≤1.60 ≤0.030 ≤0.030 ≤0.55 -
S355J2 ≤0.20 ≤0.55 ≤1.60 ≤0.025 ≤0.025 ≤0.55 Fully killed
S355K2 ≤0.20 ≤0.55 ≤1.60 ≤0.025 ≤0.025 ≤0.55 Fully killed
Mechanical Properties
Yield Strength (≥ N/mm²)
Thickness (mm) d≤16 16< d ≤40 40< d ≤63 63< d ≤80 80< d ≤100 100< d ≤150 150< d ≤200 200< d ≤250
S355 Grades 355 345 335 325 315 295 285 275
Tensile Strength (N/mm²)
Thickness (mm) d<3 3 ≤ d ≤ 100 100 < d ≤ 250
S355JR 510-680 470-630 450-600
Elongation (≥%)
Thickness (mm) 3≤d≤40 40< d ≤63 63< d ≤100 100< d ≤150 150< d ≤250
S355JR 22 21 20 18 17
S355K2 20 19 18 18 17
Product Applications

Our square tubes are widely used in structural applications across multiple industries:

Construction & Infrastructure

Steel structures, large venues, exhibition centers, bridge supports, airport construction

Industrial Equipment

Lifting machinery, storage shelves, mining support, three-dimensional garages

Transportation

Shipbuilding, railway vehicles, vehicle manufacturing, transportation facilities

Specialized Applications

Wind power equipment, medical equipment, sport equipment, home furniture, ornamental uses

Company Advantages
Competitive Pricing

Strategic partnerships with steel manufacturers ensure lowest market prices while maintaining strong financial stability and diversified operations.

Quality Assurance

Professional quality control from procurement to sales with comprehensive auditing and reliable steel mill quality tracking.

Sincere Service

24-hour distribution services via multiple transport methods with simplified ordering processes and comprehensive product range.

Factory Supply S235JR S355JR Square Tube with Black Surface Treatment Size 40*40 - 500*500 0 Factory Supply S235JR S355JR Square Tube with Black Surface Treatment Size 40*40 - 500*500 1 Factory Supply S235JR S355JR Square Tube with Black Surface Treatment Size 40*40 - 500*500 2 Factory Supply S235JR S355JR Square Tube with Black Surface Treatment Size 40*40 - 500*500 3 Factory Supply S235JR S355JR Square Tube with Black Surface Treatment Size 40*40 - 500*500 4 Factory Supply S235JR S355JR Square Tube with Black Surface Treatment Size 40*40 - 500*500 5
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ASTM A-500 Square Tube

100 X 50 X T3.0mm Square Pipe

Black Surface Treatment Steel Tube