PN 35 Alloy Steel Bar PN35 Round Bars PN35 Rods

Product Description

PN 35 (Steel Grade) Overview

PN 35 refers to a medium-carbon steel grade primarily defined under the Polish National Standards (Polska Norma). It is a non-alloy quality steel that provides higher mechanical strength and hardness than standard mild steels (like PN 20) while maintaining reasonable ductility.

It is most commonly compared to the European C35 or the American AISI 1035 grades and is widely used for components requiring moderate stress resistance.

Technical Specifications (Typical)

Chemical Composition (%)

International Equivalents

The PN 35 grade aligns with these global standards for medium-carbon steel:

Key Characteristics

1. Mechanical Balance: PN 35 is an "intermediate" steel. It is stronger than low-carbon "soft" steels but easier to process and tougher than high-carbon steels like C45 or C60.

2. Heat Treatment: It responds well to normalization and quenching/tempering. While it has limited through-hardenability for very thick sections, it is excellent for surface hardening smaller components.

3. Machinability: In its normalized or annealed state, it offers very good machinability, allowing for high-quality surface finishes on turned parts.

4. Weldability: Moderate. Due to the carbon content ($0.35\%$), it is more prone to cracking than mild steel. Pre-heating to 150°C–200°C is generally advised for critical structural welds.

Common Available Formats

• Round Bars: Usually supplied in hot-rolled or cold-drawn finishes. These are the primary stock for manufacturing axles and rotating shafts.

• Rods: Used for wire drawing, high-strength nails, and forged mechanical links.

• Forgings: Frequently used as the base material for drop-forged levers, connecting rods, and crankshafts in light machinery.

Common Applications

• Automotive: Steering arms, levers, and small crankshafts.

• General Engineering: Medium-stress shafts, gears, pins, and spacers.

• Construction: Tie rods, high-strength bolts, and load-bearing pins.

• Agriculture: Components for plows and structural frames of farm equipment.

Processing Temperatures

• Hot Forming: 850°C – 1100°C.

• Normalizing: 860°C – 890°C.

• Annealing: 650°C – 700°C.

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

• Tempering: 550°C – 660°C.