T3 Temper Electrolytic Tinplate Stone Finish MR Type Sheet for Round Food Can Closure Lid 0.17mm-0.24mm Thickness

T3 Temper Stone Finish Electrolytic Tinplate for Round Food Can Closures

This T3 temper electrolytic tinplate with stone finish surface texture and MR type base steel is engineered for high-volume round food can closure lid production. The distinctive stone finish surface morphology delivers measurable advantages in stamping lubricant retention and reduced tool wear, making it the preferred choice for manufacturers producing millions of lids per month.

Stone Finish Benefits for Lid Stamping

• Enhanced Lubricant Retention: The controlled micro-texture of the stone finish (Ra 0.30-0.50 μm) creates minute oil reservoirs on the sheet surface, ensuring consistent lubrication throughout the blanking, drawing, and curling stages even at line speeds exceeding 400 SPM.
• Reduced Galling & Tool Wear: The textured surface minimizes direct metal-to-metal contact between the sheet and tooling surfaces, significantly reducing galling tendency and extending punch and die service intervals by up to 30% compared to bright-finish alternatives.
• Improved Blank Stacking: The stone finish provides superior inter-sheet friction characteristics, enabling stable blank stacking in magazine feeders without double-sheet pickup issues that plague smoother surface finishes.
• Consistent Coating Adhesion: Despite the textured surface, the stone finish maintains excellent lacquer adhesion properties, with cross-cut test results consistently achieving ISO Class 0 ratings.

T3 Temper with MR Type Steel

The combination of T3 temper (HR30T 55-61) and MR-type steel chemistry delivers the ideal mechanical property window for closure lid stamping: adequate yield strength to prevent panel buckling under vacuum, sufficient elongation for curl formation without edge cracking, and consistent earing behavior (Δr ≤ 0.2) for uniform flange geometry after drawing.

Typical Closure Lid Sizes Supported

Quality Documentation

Every shipment includes comprehensive quality documentation: chemical composition analysis per heat number, mechanical property certification including yield strength, tensile strength, and elongation, surface roughness profilometer reports, coating mass distribution verification, and EN 10204 Type 3.1 inspection certificates.

Get in touch with our technical sales team to discuss your closure lid specification requirements, request material samples, or receive a competitive price quotation for your planned order volumes.