September 1, 2025

Gonmo Cold-Rolled Medium & High-Carbon Portfolio: Precision Steels for Today’s Mobility

Tight Tolerances, Clean Steel: 51CrV4 to 65Mn for Tier-1/Tier-2 Programs

From seat-frame stampings to high-torque drivetrains, Gonmo’s stocked portfolio covers the critical components that keep vehicles light, strong, and safe. Produced on LY Steel’s clean-steel route and available globally through Gonmo’s regional service centers, these grades deliver tight, predictable forming and fatigue performance for Tier-1 & Tier-2 programs.

The Six Grades at a Glance

51CrV4 — Fatigue-critical springs
Clutch diaphragm springs, torsion bars, and stabilizer blades—components that flex millions of times without sagging.

42CrMo4 — Strength under shock
Crankshafts, connecting rods, differential pinions, and high-load fasteners where strength and impact resistance must coexist.

16MnCr5 — Case-hardening workhorse
Gear sets, cam lobes, and injector pump parts demanding a “hard skin, tough core” profile.

S20C–S55C — Versatile carbon steels
Seat-track rails (S20C), steering yokes (S35C), parking-brake levers & sprockets (S45C/S55C).

C60 — Safety & suspension
Seat-belt locking pawls, safety buckles, and leaf-spring laminations that must hold shape during sudden loads.

65Mn — Elasticity + wear
Timing-chain links, valve springs, and ABS sensor rings where snap-back and surface wear resistance are both essential.

Why Gonmo + LY Steel

Clean, consistent strip: Cold-rolled 2.0–6.0 mm for tight-tolerance blanking and stable press performance.
Predictable forming: Coil-to-coil hardness fluctuation < 30 MPa for reliable tooling windows.
Global availability: Regional service centers for just-in-time supply and rapid line trials.

Typical Applications

Chassis & Suspension: Stabilizer blades, torsion bars (51CrV4)
Powertrain: Crankshafts, conrods, pinions (42CrMo4); gears & cams (16MnCr5)
Body & Seating Systems: Seat tracks (S20C), steering yokes (S35C)
Safety Hardware: Buckles, pawls, springs (C60, 65Mn)
Engine & Controls: Timing chains, valve springs, ABS rings (65Mn)

Let’s Engineer a Lighter, Stronger Drivetrain—Together

Need datasheets, trial coils, or a joint application study? Get in touch and our engineering team will align grade, thickness, and heat-treat paths to your tooling and performance targets.