PN 15HG Alloy Steel Bar 15HG Round Bars 15HG Rods

Product Description

PN 15HG is a Polish standard (PN - Polska Norma) structural alloy steel intended for case hardening (carburizing). It offers an excellent balance of core toughness and superficial hardness after surface treatment, preventing surface fatigue and fracturing under high dynamic loads.

Global Cross-Reference & Equivalents

If you are procuring or substituting PN 15HG alloy steel bars, you will find it directly correlates to standard chromium-manganese case-hardening steels globally:

Chemical Composition (Typical wt.%)

The chemistry of 15HG relies on manganese to guarantee deep hardenability and chromium to secure high surface hardness and wear resistance after carburization.

• Carbon (C): 0.12% – 0.18%

• Manganese (Mn): 1.10% – 1.40%

• Chromium (Cr): 0.70% – 1.00%

• Silicon (Si): 0.17% – 0.37%

• Phosphorus (P): $\le$ 0.035%

• Sulfur (S): $\le$ 0.035%

Standard Supply States & Mechanical Properties

15HG round bars and rods are typically processed and supplied in specific conditions optimized for your subsequent manufacturing steps:

1. Delivery Conditions

• Annealed (+A): Maximum hardness around 207 HBW, tailored for high-yield machining or cold shearing.

• Normalized (+N): Standardizes grain matrix, optimizing dimensional stability prior to heat-treatment cycles.

2. Core Properties (Typical Post-Quench & Temper)

• Tensile Strength ($R_m$): 780 – 1080 MPa

• Yield Strength ($R_e$): $\ge$ 440 MPa

• Elongation ($A$): $\ge$ 10%

• Impact Toughness ($KV$): 32 J to 45 J minimum

Dominant Industrial Applications

Due to its composition, 15HG is excellent for medium-stressed engineering components up to approximately 35 mm in cross-section that face severe abrasive wear but must resist brittle failure:

• Gear Transmission: Light-to-medium load spur gears, bevel gears, synchronous rings, and pinions.

• Shafts & Axles: Spline shafts, universal joint journals, steering linkages, and drive shafts.

• Machinery Hardware: High-wear components like cam tracks, bushings, clamping pins, and heavy-duty tool holders.