Shandong Baimaoxing Iron and Steel Co., Ltd.
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High-quality C122 seamless copper tubing, conforming to ASTM B280 standard
High-quality C122 seamless copper tubing, conforming to ASTM B280 standard
High conductivity pure copper rod - T1/T2/T3/TU1/TU2 electrical contacts / heat-conducting pipes / general substrate for precision instruments
High conductivity pure copper rod - T1/T2/T3/TU1/TU2 electrical contacts / heat-conducting pipes / general substrate for precision instruments
99.9% Copper Plate C1100 C18200 C70600 T2 C11000 C1221 Thick Copper Sheet/Plate
99.9% Copper Plate C1100 C18200 C70600 T2 C11000 C1221 Thick Copper Sheet/Plate
Multi-model universal brass tubing - H62/H65/H68/HPb59-1/H70 refrigeration/bathroom/HVAC universal base material
Multi-model universal brass tubing - H62/H65/H68/HPb59-1/H70 refrigeration/bathroom/HVAC universal base material
High-quality brass rod supplier - H59/H62/H65/H68/HPb59-1 general-purpose base material for hardware/electronics/mechanical applications
High-quality brass rod supplier - H59/H62/H65/H68/HPb59-1 general-purpose base material for hardware/electronics/mechanical applications
Wear-resistant C28000 C26000 brass plate for decoration and construction
Wear-resistant C28000 C26000 brass plate for decoration and construction
High-quality 4140/4130/4340 carbon alloy steel round bars, hot-rolled/cold-rolled, thickness 6-600mm
High-quality 4140/4130/4340 carbon alloy steel round bars, hot-rolled/cold-rolled, thickness 6-600mm
Hot-rolled Q195/ Q235/ Q235b/ Q345/ A36/ SS400/ SA302 carbon steel coils for the construction industry
Hot-rolled Q195/ Q235/ Q235b/ Q345/ A36/ SS400/ SA302 carbon steel coils for the construction industry
Low-priced ASTM A53 A106 Gr.B low-carbon steel seamless tubes, Sch40 Sch80 hot-rolled MS round tubes, used for manufacturing
Low-priced ASTM A53 A106 Gr.B low-carbon steel seamless tubes, Sch40 Sch80 hot-rolled MS round tubes, used for manufacturing
Factory direct sales of Q235/Q345/SS400/Q355 carbon steel plates, thickness 6mm-12mm, reasonable prices, bending and welding processing services available
Factory direct sales of Q235/Q345/SS400/Q355 carbon steel plates, thickness 6mm-12mm, reasonable prices, bending and welding processing services available
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High-quality 414041304340 carbon alloy steel round bars, hot-rolledcold-rolled, thickness 6-600mm (1).jpg
High-quality 414041304340 carbon alloy steel round bars, hot-rolledcold-rolled, thickness 6-600mm (2).jpg
High-quality 414041304340 carbon alloy steel round bars, hot-rolledcold-rolled, thickness 6-600mm (3).jpg
High-quality 414041304340 carbon alloy steel round bars, hot-rolledcold-rolled, thickness 6-600mm (4).jpg
High-quality 414041304340 carbon alloy steel round bars, hot-rolledcold-rolled, thickness 6-600mm (5).jpg
High-quality 414041304340 carbon alloy steel round bars, hot-rolledcold-rolled, thickness 6-600mm (6).jpg
High-quality 414041304340 carbon alloy steel round bars, hot-rolledcold-rolled, thickness 6-600mm (7).jpg
High-quality 414041304340 carbon alloy steel round bars, hot-rolledcold-rolled, thickness 6-600mm (8).jpg
High-quality 414041304340 carbon alloy steel round bars, hot-rolledcold-rolled, thickness 6-600mm (9).jpg

High-Quality 4140/4130/4340 Carbon Alloy Steel Round Bars from China Supplier Factory, Hot-Rolled/Cold-Rolled, 6-600mm

Discover our premium carbon steel round bars, sourced from reliable China suppliers and manufactured in our state-of-the-art factory. Available in grades Q235B, A36, 1045, and 45#, these bars come in customizable diameters ranging from 5 to 300mm and lengths up to 6m, or they can be cut-to-size to meet your specific requirements. Designed for superior machinability, weldability, and tensile strength, our products undergo precise forging and rolling processes, along with rigorous quality checks. Fully compliant with ASTM and GB standards, our carbon steel round bars are ideal for a wide range of industrial applications, including machinery parts, fasteners, shafts, construction brackets, and automotive components.

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    Product Details

    Carbon Steel Round Bar

    Precision-machined carbon steel round bars are designed to meet structural load-bearing and precision machining requirements, encompassing a variety of grades: Low-carbon steel (1018, Q235B, A36) offers excellent cold formability, weldability, and ductility, making it ideal for components requiring bending, stamping, or general structural support; Medium-carbon steel (1045, 45#, 20#) balances machinability and heat-treatable strength, achieving a tensile strength of up to 600MPa after quenching and tempering, suitable for load-bearing shafts and mechanical parts; High-carbon steel (40Cr, 45Mn2) incorporates alloying elements, enhancing hardness and wear resistance, making it ideal for gears and tool blanks.

    We offer flexible, project-specific specifications: diameters ranging from 3 mm (micro precision pins) to 500 mm (heavy-duty structural bars), standard lengths up to 6 meters, and custom cutting, chamfering, or threading services are available. Manufacturing processes are matched to steel grades—large-diameter structural bars are hot-rolled (ensuring grain refinement and toughness), while small-diameter precision bars are cold-drawn (achieving tight dimensional tolerances of ±0.03 mm and a smooth surface with Ra≤1.6μm). Optional surface treatments include blackening (black anodizing), phosphating (rust prevention), or polishing (meeting aesthetic and friction reduction requirements).

    These round bars offer both cost-effectiveness and versatility, playing a crucial role in machinery manufacturing (precision shafts, bearings, fasteners), automotive (suspension components, engine connecting rods), construction (reinforcing bars, scaffolding pins), agricultural equipment (plow shafts, gear components), and mold making (mold blanks, drill bits). Products fully comply with GB/T 702, ASTM A108, and ISO 683-1 standards, and each batch undergoes rigorous quality verification, including ultrasonic testing, tensile/impact testing, and hardness (HB/HRC) measurement. We offer bulk supply, just-in-time delivery, and technical consulting services to help global customers balance performance, cost, and processing efficiency in a variety of industrial applications.

    High-quality 414041304340 carbon alloy steel round bars, hot-rolledcold-rolled, thickness 6-600mm

    Product Parameters

    Product Name Aisi 4140 Flat Angle 1060 C45 Ck45 1095 1020 A36 Q235 Sae 1016 1084 Low Round Carbon 1045 1050 1055 Steel Bar
    Standard ASTM A106, ASTM A53, API 5L Gr.B, DIN17175, DIN1629
    Outer Dia: 20mm-610mm
    Wall Thickness 4mm-70mm
    Dia Tolerance Control with in the standard, OD:+-1%, WT:+-10%
    Materials 10#, 20#, 45#, 16Mn, A106(B, C), A53(A, B), API J55, API K55, Q235, Q345, ST35.8, ST37, ST42, ST45, ST52
    Inspection ISO, BV, SGS, MTC
    Packing Waterproof paper, and steel strip packed. Standard Export Seaworthy Package. Suit for all kinds of transport, or as required
    Supply Ability 1000 metric tons/month
    MOQ 5 metric ton, sample order accepted

    Packing And Shipping

    High-quality round metal bars conforming to standard packaging
    High Quality packaging and storage protection

    Frequently Asked Questions (FAQ)

    Q What steel grades and types of carbon steel bars are provided?
    We supply low-carbon steel (such as 1018, Q235B, A36), medium-carbon steel (including 1045, 45#, 20#), and high-carbon/alloy steel (such as 40Cr, 45Mn2, AISI 4140, 1060, 1095), fulfilling diverse structural, mechanical, and wear-resistance needs.
    Q What size ranges and processing customizations are available?
    Diameters range from 3 mm micro precision pins up to 500 mm (or 610 mm outer diameter for structural requirements), with standard lengths up to 6 meters. We also support custom cutting, chamfering, threading, and tight cold-drawn tolerances up to ±0.03 mm.
    Q What manufacturing standards and quality inspections are applied?
    Our products comply with ASTM A108, ASTM A106, ASTM A53, GB/T 702, and ISO 683-1 standards. Each batch undergoes rigorous quality verification, including ultrasonic testing, tensile/impact testing, and hardness tests, backed by ISO, BV, SGS, and MTC certifications.
    Q What are the available surface treatments?
    Available surface finishes include blackening (black anodizing/oxide), phosphating for anti-rust protection, and high-precision polishing (achieving surface roughness Ra≤1.6μm) for aesthetic and reduced-friction requirements.
    Q What is the Minimum Order Quantity (MOQ) and monthly supply capacity?
    Our standard MOQ is 5 metric tons, with sample orders warmly accepted. Our monthly supply capacity reaches up to 1,000 metric tons, supported by just-in-time delivery for global orders.
    Q How are the products packed for international sea freight?
    The bars are bundled and protected with waterproof paper and reinforced steel strip strapping. They are delivered in standard export seaworthy packaging suitable for long-distance container or break-bulk shipping.

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