Alloy Steel 35C8 Round Bar 35C8 Bars 35C8 Rods

Product Description

35C8 is a medium-carbon steel grade designated under Indian Standards (IS 1570 or IS 5517). It is an unalloyed structural carbon steel engineered to deliver a balanced combination of moderate tensile strength, ductility, and excellent machinability at a highly economical cost compared to fully alloyed steels.

It is universally supplied as hot-rolled, cold-drawn, or turned round bars, rods, and flats for standard engineering applications.

Technical Specifications

1. Chemical Composition

The absence of significant intentional alloying elements (like chromium, nickel, or molybdenum) classifies this strictly as a carbon steel. The manganese content is optimized to provide sufficient hardness depth during manufacturing.

2. Global Material Equivalents

Because it is a straightforward medium-carbon grade, it has precise equivalents across all major international material standards:

• India (IS): 35C8 / C35 Mn

• USA (AISI / SAE / ASTM): 1035 / 1038

• Germany / Europe (DIN, EN): C35 (1.0501) / C35E (1.1181) / En8A

• United Kingdom (BS): 080M36

• Japan (JIS): S35C

• China (GB/T): 35 Steel

Mechanical Properties (Typical Heat-Treated State)

While frequently used in the as-rolled or normalized condition, 38C8/35C8 bars can be oil or water quenched and tempered to elevate their mechanical thresholds:

• Tensile Strength ($R_m$): $550 - 700\text{ MPa}$

• Yield Strength ($R_e$): $\ge 320\text{ MPa}$

• Elongation ($A_5$): $\ge 20\%$

• Brinell Hardness (Annealed/Normalized): $170 - 210\text{ HBW}$

Typical Applications

35C8 round bars are widely utilized in automotive, general engineering, and agricultural equipment manufacturing for light-to-medium stress components:

• Fasteners & Hardware: Grade 8.8 structural bolts, long studs, heavy-duty tie rods, and threaded anchors.

• Shafts & Axles: Lightly loaded transmission shafts, pump shafts, spindles, and steering arms.

• Machined Elements: Standard pins, keys, spacer rings, levers, and brackets.

• Forgings: Forged blanks, connecting arms, and hand tools requiring moderate structural stiffness.

Processing & Fabrication Notes

Machinability Advantage: Thanks to its balanced carbon structure, 35C8 offers excellent chip formation and low tool wear, making it a favorite for high-speed CNC turning, drilling, and milling operations.

• Heat Treatment: To increase surface durability, 35C8 responds exceptionally well to induction hardening or flame hardening, raising the wear-resistant surface shell to approximately $50 - 54\text{ HRC}$ while maintaining a ductile core.

• Welding: It possesses fair weldability. Preheating to $150^\circ\text{C} - 200^\circ\text{C}$ is highly recommended for thick-walled sections (greater than 20mm) to minimize local thermal stresses and prevent hydrogen cracking in the heat-affected zone.