UNI 1C35 Alloy Steel Bar C35 Round Bars C35C Rods

Product Description

UNI 1C35 / C35 Steel Overview

UNI 1C35 is an Italian standard medium-carbon steel grade (per UNI EN 10083) that provides a robust balance of strength, ductility, and wear resistance. It is often referred to simply as C35 or C35C in its cold-forming or "quality" variations.

This grade is a "through-hardening" steel, meaning it can be heat-treated to achieve uniform mechanical properties throughout the cross-section of the bar, provided the diameter is within a moderate range.

Chemical Composition (%)

The chemical makeup is tightly controlled to ensure consistent performance during machining and heat treatment.

Mechanical Properties (Typical)

Values depend largely on the heat treatment state (Normalized vs. Quenched & Tempered).

International Equivalents

UNI 1C35 is highly interchangeable with major global engineering standards:

Key Characteristics

1. Machinability: In the normalized or annealed state, 1C35 is very easy to process, making it ideal for high-volume production of turned parts.

2. Heat Treatment: It responds well to induction or flame hardening. It is often used to create components with a hard surface for wear resistance and a tough core for impact resistance.

3. Weldability: Moderate. Due to the $0.35\%$ carbon content, pre-heating to 150°C – 200°C is recommended to prevent cold cracking in the weld zone.

4. Toughness: It is significantly tougher and more impact-resistant than higher carbon steels like C45, making it better for parts that encounter sudden loads.

Common Available Formats

• Round Bars: Available as Hot Rolled (black) or Cold Drawn / Peeled (bright). Bright bars are the standard choice for precision CNC machining.

• Rods: Often used as starting material for cold-heading, wire drawing, or for manufacturing high-strength mechanical pins.

• Forged Blocks: Used for heavy-duty structural parts in industrial machinery.

Common Applications

• Automotive: Connecting rods, steering knuckles, and small axles.

• General Engineering: Levers, gears, spindles, and rotating shafts.

• Fasteners: Medium-tensile bolts (Class 8.8) and studs.

• Agriculture: Wear parts and structural links for farm machinery.

Processing Temperatures

• Hot Forming: 850°C – 1100°C.

• Normalizing: 860°C – 890°C.

• Annealing (Soft): 650°C – 700°C.

• Hardening: 840°C – 880°C (Quench in Water or Oil).

• Tempering: 550°C – 660°C.