BS 40HS Alloy Steel Bar 40HS Round Bars 40HS Rods

Product Description

BS 40HS (En14) Steel Overview

BS 40HS, better known under the older British Standard designation En14, is a carbon-manganese through-hardening steel. It is characterized by its high manganese content, which improves the depth of hardening and provides superior mechanical properties compared to standard carbon steels like En8 (080M40).

This grade is specifically engineered for parts that require higher tensile strength and better impact resistance, particularly in larger cross-sections where standard carbon steels might fail to harden through the center.

Chemical Composition (%)

The "HS" (High Strength) and "Manganese" focus are evident in the chemical makeup, which balances carbon for strength and manganese for hardenability.

Mechanical Properties (Quenched & Tempered)

In the "T" condition (heat-treated), BS 40HS round bars typically exhibit:

• Tensile Strength ($R_m$): 775 – 925 MPa

• Yield Strength ($R_e$):$\ge$ 525 MPa

• Elongation ($A_5$):$\ge$ 15%

• Impact Strength (Izod):$\ge$ 41 J

• Hardness (Brinell): 223 – 277 HB

International Equivalents

BS 40HS/En14 is a specific British designation, but it aligns with other high-manganese structural steels:

Key Characteristics

1. Improved Hardenability: Thanks to the high manganese content ($1.30\% - 1.70\%$), 40HS hardens more deeply and consistently than standard medium-carbon steels.

2. Toughness: It offers excellent resistance to shock and vibration, making it a reliable choice for moving mechanical parts.

3. Machinability: While slightly more difficult to machine than En8 due to the manganese, it still offers good machinability in the normalized or annealed condition.

4. Weldability:Fair. Pre-heating is strongly recommended ($100°C - 250°C$) because the high manganese and carbon content increase the risk of cracking in the heat-affected zone.

Common Available Formats

• Round Bars: Commonly supplied in the "as rolled" or "T condition" (Quenched and Tempered). Used for high-load shafts and axles.

• Rods: Often used for high-strength pins, studs, and heavy-duty industrial fasteners.

• Forgings: Excellent for drop forging of complex structural components where safety and strength are critical.

Common Applications

• Lifting Equipment: Hooks, shackles, and high-tensile pins.

• Automotive: Axles, steering arms, and suspension components.

• Mechanical Engineering: High-strength bolts, crankshafts, and geared shafts.

• Oil & Gas: Specialized fasteners and structural connectors.

Thermal Processing Data

• Forging: 900°C – 1200°C.

• Normalizing: 840°C – 880°C.

• Annealing: 680°C – 710°C (Slow furnace cool).

• Hardening: 830°C – 860°C (Oil or Water quench).

• Tempering: 550°C – 660°C (Depending on the required tensile range).