Steel Bar Usage in the Automotive Industry and 2026 Trends

The Relationship Between the Automotive Industry and Steel Bar

The automotive industry accounts for approximately 12% of global steel consumption, and steel bar represents a significant portion of this demand. Steel bar materials are used across a wide range of applications, from engine components to drivetrain parts, suspension components to fasteners. In 2026, the industry has shifted toward new material demands driven by electric vehicle transition and lightweighting trends.

Most Commonly Used Steel Bar Grades in Automotive

Case Hardening Steels

16MnCr5 (1.7131) is the primary material for automotive gear production:

• Surface hardness: 58-62 HRC (after carburizing)
• Core hardness: 30-40 HRC
• Applications: Transmission gears, differential gears, camshafts
• Superior wear resistance combined with high core toughness

20MnCr5 (1.7147) is preferred for larger cross-section parts:

• Deeper carburizing depth
• Heavy-duty transmission gears
• Truck and heavy equipment applications

Quenched and Tempered Steels

CK45 (C45, 1.0503) is the fundamental material for shaft and axle production:

• Tensile strength after quenching and tempering: 700-850 MPa
• Applications: Crankshafts, transmission shafts, piston rods
• Optimal cost-performance ratio

42CrMo4 (1.7225) for highly stressed components:

• Tensile strength: 900-1100 MPa
• Applications: Racing car components, heavy-duty axles

Free-Cutting Steels

11SMnPb30 and 11SMn30 for high-volume fastener production:

• Bolt, nut, and pin manufacturing
• Continuous serial production on CNC automatic lathes
• Transition to lead-free alternatives accelerating due to ELV Directive

2026 Trends and Future Perspective

Impact of Electric Vehicle (EV) Transition

Electric vehicles create different material demands compared to traditional internal combustion engines:

• Decreasing demand: Crankshaft, camshaft, valve materials
• Increasing demand: EV reducer gears, high-speed shafts, rotor shafts
• New requirements: Tighter tolerances for NVH (noise-vibration-harshness) performance

Lightweighting Trend

• Use of thinner cross-sections with higher strength steels
• Micro-alloyed steels: V, Nb, Ti added carbon steels
• Direct controlled cooling after forging to eliminate heat treatment
• Target: 10-15% weight reduction per component

Sustainability Requirements

• Green steel demand: Low carbon footprint production
• Increasing preference for electric arc furnace (EAF) sourced steel
• Life cycle assessment (LCA) reports becoming mandatory
• Recycled content tracking

Digitalization and Quality

• Traceability via QR code on each bar
• Digital 3.1 certificates
• AI-powered surface inspection systems
• Predictive quality analysis

Quality Requirements

The automotive industry demands additional requirements beyond standard industrial applications:

• IATF 16949 certified supply chain
• Micro-cleanliness requirements (inclusion control)
• Tight tolerance bands (h9 or tighter)
• 100% ultrasonic testing (critical parts)
• Statistical process control (SPC) reporting

For equivalent grades across different standards, visit our Grade Equivalence Tool page.

Aktif Çelik's Contribution to the Automotive Industry

As Aktif Çelik, we supply 16MnCr5, 20MnCr5, CK45, 42CrMo4, and free-cutting steel grades meeting high micro-cleanliness standards for the automotive industry. With our wide stock range in hot-rolled, bright-drawn, and peeled bar forms, we are a reliable supply partner for the automotive sub-industry. Contact our technical team for information about our new material solutions suitable for the EV transition.