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Q195 Q215 S235JR S275JR SS330 SPHC Carbon Steel Square Rectangular Pipe Tube

The steel grade of our products have carbon structural steel, carbon tool steel, carbon spring steel, stainless steel, heat-resistant steel, wear-resistant steel, alloy spring steel, alloy structural steel, bearing steel, alloy tool steel, high alloy tool steel, high-speed tool steel, high temperature alloys, electrical alloy, precision alloy, low temperature steel, electrical steel, ductile iron, grey cast iron, etc.We can provide professional steel, such as bridge steel, ship steel, boiler steel, pressure vessel steel, agricultural machinery steel, etc

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  • Square tubes are classified according to their cross-sectional shapes: simple cross-section square tubes: square tubes and rectangular tubes. After the process is processed, it is rolled into strip steel. Generally, the strip steel is unpacked, flattened, crimped, and welded into a round tube, then the round tube is rolled into a square tube, and then cut to the required length. According to the production process, the square tube is divided into: hot-rolled seamless square tube, cold-drawn seamless square tube, extruded seamless square tube, and welded square tube. Rectangular pipes are divided into ultra-thick-walled rectangular pipes, thick-walled rectangular pipes and thin-walled rectangular pipes according to their wall thickness.



  • Product Square and Rectangular Steel Pipe
    Material Carbon Steel
    Grade GB: Q195, Q215, Q235A, Q235B, Q235C, Q235D, Q255A, 255B,  Q275, Q295A, Q295B, Q345B, Q345C, Q345D, Q345E, Q390A, Q390B, Q390C, Q390D, Q390E, Q420, Q420B, Q420C, Q420D, Q420E, Q460D, Q460E, Q500D, Q500E, Q550D, Q550E, Q620D, Q620E, Q690D, Q690E
    EN:  S185, S235JR, S275JR, S355JR, S420NL, S460NL S500Q, S550Q, S620Q, S690Q
    ASTM:  Grade B, Grade C, Grade D, A36, Grade 36, Grade 40, Grade 42, Grade 50, Grade 55, Grade 60, Grade 65, Grade 80
    JIS: SS330, SPHC, SS400, SPFC, SPHD, SPHE
    Standard ASTM, DIN, ISO, EN, JIS, GB, etc.
    Surface Galvanized, 3PE, painting, coating oil, steel stamp, drilling, etc.
    Ends Plain ends
    Specification OD: 20*20-500*500mm ; 10*20-300*500mm, or as required.
    Thickness: 1.0-30.0mm, or as required.
    Length: 2-12m, or as required.
    Pipe ends Plain, Beveled, Threaded, Socket with holes, With PVC clap/ coupling/ clamp
    Application Widely used in machinery manufacturing, construction, metallurgical industry, agricultural vehicles, agricultural greenhouses, automobiles Industry, railway, highway guardrail, container frame, furniture, decoration, steel structure, etc.
    Tolerance ±1%
    MOQ 1 ton
    Supply Ability 5000 tons / month
    Lead Time 7-15 working days after the receipt of 30% deposit
    Payment Terms 30%T/T Advance + 70% Balance
    Price Terms FOB, CFR, CIF, EXW
    Packing Standard sea-worthy package or as required


  • Mechanical character & Chemical element of normal material:
    Material Q195 C Mn Si S P  
    Chemical 0.06-0.12 0.25-0.50 ≤0.30 ≤0.050 ≤0.045  
    Composition Tensile strength: 315-430(Mpa)
    (%) Yield strength:195(Mpa)
      Elongation:33
      Q235 C Mn Si S P  
      0.12-2.0 0.3-0.70 ≤0.30 ≤0.045 ≤0.045  
      Tensile strength: 375-460(Mpa)
      Yield strength:235(Mpa)
      Elongation:26
      Q345 C Mn Si S P V
      ≤0.20 ≤1.70 ≤0.55 ≤0.040 ≤0.040 0.02-0.15
      Tensile strength: 470-630(Mpa)
      Yield strength:345(Mpa)
      Elongation:21

    Rectangular Hollow Section Square Hollow Section
    Size Thickness Size Thickness Size Thickness
    mm mm mm mm mm mm
    50 X 25 2 120 X 40 3 20 x 20 2
    50 X 25 2.5 120 X 40 3.6 20 x 20 2.5
    50 X 25 3 120 X 40 4 25 x 25 2
    50 X 30 2.5 120 X 40 5 25 x 25 2.5
    50 X 30 3 120 X 40 6 25 x 25 3
    50 X 30 3.2 120 X 40 6.3 30 x 30 2.5
    50 X 30 4 120 X 60 3 30 x 30 3
    60 X 40 2.5 120 X 60 3.6 40 x 40 2
    60 X 40 3 120 X 60 4 40 x 40 2.5
    60 X 40 3.2 120 X 60 5 40 x 40 3
    60 X 40 4 120 X 60 6 40 x 40 4
    80 X 40 3 120 X 60 6.3 50 x 50 2
    80 X 40 3.2 120 X 80 3 50 x 50 2.5
    80 X 40 4 120 X 80 4 50 x 50 3
    80 X 60 2.5 120 X 80 5 50 x 50 4
    80 X 60 3 120 X 80 6 50 x 50 5
    80 X 60 3.6 120 X 80 6.3 60 x 60 3
    80 X 60 4 150 X100 3 60 x 60 4
    80 X 60 5 150 X100 4 60 x 60 5
    90 X 50 2.5 150 X100 5 70 x 70 3
    90 X 50 3 150 X100 6 70 x 70 3.6
    90 X 50 3.6 150 X100 6.3 70 x 70 5
    90 X 50 4 160 X 80 3 80 x 80 3
    90 X 50 5 160 X 80 4 80 x 80 3.6
    100 X 40 3 160 X 80 5 80 x 80 5
    100 X 40 3.6 160 X 80 6 80 x 80 6
    100 X 40 4 160 X 80 6.3 90 x 90 3
    100 X 40 5 200 X 100 4 90 x 90 3.6
    100 X 50 3 200 X 100 5 90 x 90 5
    100 X 50 3.6 200 X 100 6 90 x 90 6
    100 X 50 4 200 X 100 6.3 100 x 100 4
    100 X 50 5 200 X 100 8 100 x 100 5
    100 X 50 6 200 X 100 10 100 x 100 6
    100 X 50 6.3 200 X 100 12.5 100 x 100 8
    100 X 60 3 200 X 100 16 100 x 100 10
    100 X 60 3.6 250 X 150 6.3 120 x 120 5
    100 X 60 4 250 X 150 8 120 x 120 6
    100 X 60 5 250 X 150 10 120 x 120 8
    100 X 60 6 250 X 150 12.5 120 x 120 10
    100 X 60 6.3 250 X 150 16 150 x 150 5
    100 X 80 3 300 X 200 6.3 150 x 150 6
    100 X 80 3.6 300 X 200 8 150 x 150 8
    100 X 80 4 300 X 200 10 150 x 150 10
    100 X 80 5 300 X 200 12.5 180 x 180 6
    100 X 80 6 300 X 200 16 180 x 180 8
    100 X 80 6.3 400 X 200 10 180 x 180 10
        400 X 200 12.5 180 x 180 12.5
        400 X 200 16 200 x 200 6
        450 X 250 10 200 x 200 8
        450 X 250 12.5 200 x 200 10
        450 X 250 16 200 x 200 12.5
            250 x 250 8
            250 x 250 10
            250 x 250 12.5
            300 x 300 8
            300 x 300 10
            300 x 300 12.5


    Chemical & Mechanical Properties of Carbon Steel Square Pipes
    Standard Grade Chemical Components (%) Mechanical Properties
    C Si Mn P S Tensile Strength (Mpa) Yield Strength(Mpa)
    ASTM AS3 A ≤0.25 - ≤0.95 ≤0.05 ≤0.06 ≥330 ≥205
    B ≤0.30 - ≤1.2 ≤0.05 ≤0.06 ≥415 ≥240
    ASTM A106 A ≤0.30 ≥0.10 0.29-1.06 ≤0.035 ≤0.035 ≥415 ≥240
    B ≤0.35 ≥0.10 0.29-1.06 ≤0.035 ≤0.035 ≥485 ≥275
    ASTM A179 A179 0.06-0.18 - 0.27-0.63 ≤0.035 ≤0.035 ≥325 ≥180
    ASTM A192 A192 0.06-0.18 ≤0.25 0.27-0.63 ≤0.035 ≤0.035 ≥325 ≥180
    API  5L PSL1 A 0.22 - 0.9 0.03 0.03 ≥331 ≥207
    B 0.28 - 1.2 0.03 0.03 ≥414 ≥241
    X42 0.28 - 1.3 0.03 0.03 ≥414 ≥290
    X46 0.28 - 1.4 0.03 0.03 ≥434 ≥317
    X52 0.28 - 1.4 0.03 0.03 ≥455 ≥359
    X56 0.28 - 1.4 0.03 0.03 ≥490 ≥386
    X60 0.28 - 1.4 0.03 0.03 ≥517 ≥448
    X65 0.28 - 1.4 0.03 0.03 ≥531 ≥448
    X70 0.28 - 1.4 0.03 0.03 ≥565 ≥483
    API  5L PSL2 B 0.24 - 1.2 0.025 0.015 ≥414 ≥241
    X42 0.24 - 1.3 0.025 0.015 ≥414 ≥290
    X46 0.24 - 1.4 0.025 0.015 ≥434 ≥317
    X52 0.24 - 1.4 0.025 0.015 ≥455 ≥359
    X56 0.24 - 1.4 0.025 0.015 ≥490 ≥386
    X60 0.24 - 1.4 0.025 0.015 ≥517 ≥414
    X65 0.24 - 1.4 0.025 0.015 ≥531 ≥448
    X70 0.24 - 1.4 0.025 0.015 ≥565 ≥483
    X80 0.24 - 1.4 0.025 0.015 ≥621 ≥552


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