Carbon steel rods are rod-shaped materials made of carbon steel.
Low carbon steel (≤0.25%): With an elongation exceeding 25%, it is suitable for stamping applications such as construction rebar and automotive panels.
Medium carbon steel (0.25%-0.6%): High strength. After quenching and tempering, it is suitable for mechanical parts such as shafts and rods.
High carbon steel (>0.6%): High hardness, commonly used in applications such as knives and springs that require high wear resistance and elasticity.
Processing properties: Low carbon steel has excellent weldability, while medium and high carbon steels require preheat treatment (such as quenching) to improve processing properties.
Typical applications:
Construction industry: Low carbon steels such as Q235 are used for rebar.
Mechanical manufacturing: Medium carbon steels are used for shafts and rods.

AISI 4140 is a chromium‑molybdenum low‑alloy steel (equivalent to 42CrMo4, SCM440, EN19) offering high tensile strength, good toughness, and excellent fatigue resistance.

Typical composition: C 0.38–0.43%, Cr 0.80–1.10%, Mo 0.15–0.25%, Mn 0.75–1.00%, P/S ≤0.035%.

Mechanical properties (quenched & tempered): tensile strength ≥850 MPa (often 1000–1200 MPa), yield strength ≥650 MPa, elongation ≥12%, hardness 240–300 HB.

Applications: heavy‑duty shafts, gears, connecting rods, axles, bolts, studs, and machine tool components.

Heat treatment: normally supplied in quenched and tempered condition; can be induction or flame hardened. Weldability is fair but requires preheating (150–250°C) and post‑weld stress relief to avoid cracking.

Available in hot‑rolled, peeled, turned, or cold‑drawn round bars in various diameters and lengths.

A36 is a low-carbon structural steel grade defined by ASTM A36/A36M. As a mild steel, it offers a balanced combination of strength, ductility, and weldability at a low cost.

Chemical Composition (typical): C ≤0.26%, Mn ≤1.35%, P ≤0.04%, S ≤0.05%, Si ≤0.40% (by agreement).

Mechanical Properties: Yield strength ≥250 MPa (36 ksi) for thickness ≤200 mm; tensile strength 400–550 MPa; elongation ≥20% (in 200 mm).

Form & Finish: Supplied hot-rolled with square cross-sections (typical sizes from 10×10 mm up to 300×300 mm), in standard lengths of 6 m or 12 m. Black (mill) surface, but can be further processed to bright or pickled condition.

42CrMo4 (Material No. 1.7225) is a chromium-molybdenum low-alloy steel, known for its high strength, excellent toughness, good torsional strength, and outstanding fatigue resistance. It is commonly referred to as the European equivalent to AISI 4140. Manufactured according to EN 10083-3 standard

Hot rolled carbon steel round bar is a solid, long steel product with a circular cross-section. It is produced by heating steel billets above their recrystallization temperature and then rolling them into cylindrical shapes. This process results in a product with a rough, blue-grey surface finish and slightly less precise dimensional tolerances compared to cold drawn bars.

As a general-purpose steel product, hot rolled round bar offers an excellent combination of formability, weldability, and strength. It is available in a wide range of carbon steel grades, from mild low-carbon steels to higher-carbon and alloy grades, making it suitable for diverse industrial applications

S275JR is a non-alloy structural steel grade defined by the European standard EN 10025-2. The designation “S” stands for Structural Steel, “275” indicates a minimum yield strength of 275 MPa, and “JR” denotes that the material has been impact tested at room temperature (+20°C). The steel is also known by its material number 1.0044. In the former German standard (DIN 17100), the equivalent grade was St 44-2.

S275JR carbon steel round bars are solid cylindrical bars produced from low-carbon manganese steel. They are widely used in structural and general engineering applications where a combination of strength, good weldability, and excellent formability is required