Cold Rolled Strip｜High Precision for Mold and Fine Mechanical Parts

Common Problems in Precision Mold and Machine Component ManufacturingIn industries that require ultra-precise parts, such as mold making, machinery, and automotive component manufacturing, many factories face issues like uneven surface flatness and inconsistent thickness in their steel sheets. These variations lead to inaccurate mold forming, poor part alignment, and increased polishing or rework costs directly impacting final product quality and production efficiency.

Root Cause: Use of Unfinished Hot Rolled Strip

The primary cause lies in the use of non-finished Hot Rolled Strip, which lacks proper cold finishing processes such as surface refining and structural adjustment. This results in internal residual stress, inconsistent hardness, and rough surface texture all of which reduce precision during fine machining or component assembly.

The Solution: Premium Cold Rolled Strip from Japan

Yamaichi Special Steel (Thailand) offers high-grade Japanese Cold Rolled Strip sheets designed for exceptional surface smoothness, dimensional accuracy (±0.05 mm), and uniform microstructure. Every sheet is manufactured under Japan Quality and certified ISO 9001:2015, making it ideal for precision molds, mechanical components, and hardened automotive parts where stability and consistency are critical.

Key Grades and Technical Features

1. SK85SB – High Carbon Cold Rolled Strip for Punches and Dies

• Carbon content: 0.80–0.90%
• Hardness: HRB 90–105
• Mirror surface finish (Ra ≤ 0.8 µm)
• Excellent for quenching and tempering
• High wear resistance and machining precision
• Applications: Punch plates, die bases, spring plates
  
  

2. S60CSB – Medium Carbon Cold Rolled Strip for Structural and Precision Parts

• Carbon content: 0.55–0.65%
• Hardness: HRB 85–95
• Fine-grained structure with excellent machinability
• Suitable for cutting, turning, and forming
• High surface accuracy and flatness
• Applications: Base plates, spacers, and fine mechanical parts before hardening

Why Choose Yamaichi Cold Rolled Strip

• Manufactured to Japan Quality standards under ISO 9001:2015 certification
• Mirror-smooth surface and micron-level thickness accuracy
• Cut-to-Size Service with precision tolerance of ±0.1 mm
• Heat Treatment Service available to adjust hardness per customer needs
• Ready stock in Thailand for fast delivery, supporting both large and small orders

※ For more details, please download the brochure or contact us.

Glossary

• Cold Rolled Strip: Steel processed at low temperature to achieve superior dimensional accuracy and surface quality.
• Residual Stress: Internal stress remaining in steel after rolling, which can cause warping or distortion during machining.
• Surface Finish (Ra): A measurement of surface smoothness; lower Ra values indicate a finer, mirror-like finish.

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