What's the difference bettween SPCC and MR​

​​Aspect​​

SPCC​​: ​Steel Plate Cold rolled Commercial

​​MR​​: ​Material for Tinplate, Reduced Phosphorus

​​Material Type​​

Plain cold-rolled carbon steel (non-coated),

Composition：Low-carbon steel (C ≤ 0.15%), low silicon and manganese.

Purity：Moderate impurity tolerance for non-corrosive applications.

Base material for tinplate (tin-coated steel)

Composition：Low-carbon steel (C ≤ 0.10%), with strict limits on sulfur (S ≤ 0.025%) and phosphorus (P ≤ 0.025%).

Purity：Highly pure, free of sulfide spots, compliant with food-grade standards (e.g., FDA, EU 10/2011).

​​Primary Use​​

General industrial applications (e.g., machinery parts,appliance casings, stationery) 

Key Requirements:Formability, weldability

Food-grade packaging (e.g., Milk powder cans, three-piece cans, beverage cans, pharmaceutical packaging) 

Key Requirements: Corrosion resistance, solderability, food safety

​​Composition​​

Standard carbon steel, no specific corrosion resistance requirements

Low residual elements (e.g., phosphorus, sulfur), compliant with food safety standards

​​Production​​

No annealing classification

Classified by annealing methods (CA/BA)

​​Standards​​

Japanese JIS standard (JIS G3141,widely adopted globally)

Chinese National Standard (GB/T 2520-2017) or  Baosteel enterprise standards (e.g., Q/BQB450-2009)

Surface

Requires additional tin plating/painting

Pre-tinned and passivated for direct packaging