Boost Your Supply Chain: Competitive-Priced Food Grade T3 Ba 0.32X850X775 Tinplate Sheet Sales for Packaging, Electronics & ASTM A623m Mr Cans Factory

Product Description

Product Description

Boost Your Supply Chain: Competitive-Priced Food Grade T3 BA 0.32x850x775 Tinplate Sales for Packaging, Electronics & More Factory
Tinplate is a tin-coated steel sheet (or strip) with a dual-layer structure: a steel substrate (core material) and a tin coating (surface layer). Its chemical composition and mechanical properties are determined by both the substrate and the coating, and they directly dictate its performance in packaging, electronics, construction, and other industries. Below is a detailed breakdown:
1. Chemical Composition of Tinplate
Tinplate's composition is divided into two parts: the steel substrate (the main structural component) and the tin coating (the protective/functional layer). The substrate type varies by application (e.g., food packaging vs. industrial use), while the tin coating follows strict purity standards.
1.1 Chemical Composition of the Steel Substrate
The steel substrate is typically low-carbon steel (or ultra-low-carbon steel) to ensure good formability (e.g., for shaping into cans) and weldability. The most common substrate grades are MR (Mild Steel for Drawing), L (Low Carbon), and D (Drawing Quality), with compositions compliant with international standards (e.g., ASTM A623M, GB/T 2520).

Component (Element)	Content Range (Mass Fraction)	Role & Function
Carbon (C)	≤ 0.12% (MR grade: ~0.05-0.10%)	Improves strength; too high reduces formability. Low carbon ensures the substrate can be deep-drawn (e.g., for can bodies).
Manganese (Mn)	≤ 0.60%	Enhances hardenability and tensile strength without significantly harming formability.
Silicon (Si)	≤ 0.03%	Minimizes surface defects (e.g., oxide scale) and ensures good tin coating adhesion. High Si can cause coating peeling.
Phosphorus (P)	≤ 0.025%	Lowers ductility if excessive; controlled to balance strength and formability.
Sulfur (S)	≤ 0.025%	Reduces hot workability (causes "hot shortness") if too high; strict limits prevent cracking during processing.
Iron (Fe)	Balanced (≥ 99.2%)	The base element of the steel substrate, providing structural rigidity.
Trace Elements	(e.g., Al: ≤ 0.05%, N: ≤ 0.008%)	Aluminum stabilizes nitrogen (prevents "aging" of steel), maintaining consistent mechanical properties over time.

2. Mechanical Properties of Tinplate
Mechanical properties determine tinplate's ability to withstand processing (e.g., bending, deep drawing, stamping) and end-use stress (e.g., pressure in cans, impact in transportation). They are mainly determined by the steel substrate, while the tin coating (thin, ~2-15 g/m² per side) has minimal impact on overall mechanical performance.
Key mechanical indicators and their typical ranges (compliant with ASTM A623M, GB/T 2520) are listed below, categorized by substrate grade (since grades are designed for different processing needs):

Mechanical Property	Testing Standard	MR Grade (General-Purpose)	L Grade (Low-Strength, High Ductility)	D Grade (Deep-Drawing Quality)	Core Function
Tensile Strength (σb)	GB/T 228.1	320-420 MPa	280-360 MPa	300-400 MPa	Resists breaking under tension (e.g., can sealing).
Yield Strength (σs)	GB/T 228.1	180-280 MPa	150-250 MPa	160-260 MPa	Prevents permanent deformation (e.g., during stacking of cans).
Elongation (A)	GB/T 228.1	≥ 28% (A80mm)	≥ 32% (A80mm)	≥ 30% (A80mm)	Measures ductility (critical for deep drawing into can bodies; higher = easier to shape).
Vickers Hardness (HV)	GB/T 4340.1	60-80 HV	50-70 HV	55-75 HV	Indicates surface hardness (affects scratch resistance and stamping precision).
Bending Property	GB/T 232	180° cold bending (d=0, no cracks)	180° cold bending (d=0, no cracks)	180° cold bending (d=0, no cracks)	Ensures no cracking during folding (e.g., can lids, decorative tin edges). d=0 means bending over the same thickness.
** Erichsen Index (IE)**	GB/T 4156	≥ 7.0 mm	≥ 8.0 mm	≥ 7.5 mm	Evaluates deep-drawing ability (higher = more suitable for complex shapes like seamless cans).

3. Industry-Specific Requirements
Mechanical and chemical properties are tailored to end-use scenarios:
Food Packaging: Low carbon (≤0.08%), lead-free tin coating (≤0.005%), high elongation (≥30%) for shaping, and chromate passivation for corrosion resistance.
Electronics (Shielding): Higher tensile strength (≥380 MPa) for structural stability, and thin tin coating (2-5 g/m²) for conductivity.
Construction (Roofing): Thick substrate (0.3-0.5mm), high hardness (HV ≥70) for impact resistance, and heavy tin coating (10-15 g/m²) for weather resistance.
By adhering to these composition and property standards, tinplate balances functionality, safety, and processability across diverse industries.
4.Global Tinplate Grade Standards
Different countries/regions have established authoritative standards. The table below compares the most widely used systems:

Standard System	Issuing Body	Key Grade Terminology	Typical Application Scope
ASTM A623M	ASTM International (U.S.)	MR, L, D (substrate grades); T1-T5 (tempers)	North America, global export markets (food packaging, electronics)
ISO 11950	International Organization for Standardization	DC01, DC03, DC04 (substrate grades, aligned with EN standards)	Europe, Asia, and global industrial use
GB/T 2520	Standardization Administration of China (SAC)	SPCC, SPCD, SPCE (substrate grades); T1-T5 (tempers)	China and Southeast Asia (packaging, construction, crafts)
JIS G3303	Japanese Industrial Standards Committee	SPCC, SPCD, SPCE (substrate grades); T1-T5 (tempers)	Japan, South Korea, and East Asia (automotive electronics, high-end pac

5.General-Purpose Grades (MR/L Grade)
These grades use low-carbon steel substrates with balanced strength and ductility, suitable for non-complex forming processes (e.g., shallow drawing, stamping).

Standard	Grade	Substrate Steel	Key Mechanical Properties	Typical Applications
ASTM A623M	MR (Mild Steel for Drawing)	C ≤ 0.10%, Mn ≤ 0.60%	Tensile strength: 320-420 MPa; Elongation ≥ 28%	Food cans (e.g., fruit/vegetable cans), paint tins, general packaging
GB/T 2520	SPCC (Cold-Rolled Carbon Steel Sheet)	C ≤ 0.15%, Mn ≤ 0.60%	Tensile strength: 310-410 MPa; Elongation ≥ 27%	Hardware containers, decorative tins, non-food packaging
ASTM A623M	L (Low Carbon)	C ≤ 0.08%, Mn ≤ 0.40%	Tensile strength: 280-360 MPa; Elongation ≥ 32%	Shallow-drawn parts (e.g., can lids, small cosmetic tins)

6.Deep-Drawing Grades (D/SPCE Grade)
These grades use ultra-low-carbon steel substrates with high ductility, designed for complex forming (e.g., seamless can bodies, deep cylindrical containers). They resist cracking during deep drawing.

Standard	Grade	Substrate Steel	Key Mechanical Properties	Typical Applications
ASTM A623M	D (Drawing Quality)	C ≤ 0.06%, Mn ≤ 0.40%	Tensile strength: 300-400 MPa; Elongation ≥ 30%; Erichsen Index ≥ 7.5 mm	Seamless beverage cans (e.g., soda cans), deep food cans (e.g., tuna cans)
GB/T 2520	SPCE (Deep-Drawing Cold-Rolled Steel)	C ≤ 0.08%, Mn ≤ 0.40%	Tensile strength: 270-370 MPa; Elongation ≥ 34%; Erichsen Index ≥ 8.0 mm	High-end cosmetic jars, aerosol can bodies, precision electronic shielding cases
JIS G3303	SPCE	Same as GB/T 2520	Identical mechanical properties	Japanese automotive electronic components (e.g., sensor shielding)

7. Hard-Temper Grades (T4/T5 Grade)
These grades have higher surface hardness and lower ductility, achieved via additional cold rolling of the substrate. They are used for applications requiring rigidity and scratch resistance.

Standard	Temper Grade	Base Substrate	Key Mechanical Properties	Typical Applications
ASTM/GB/T	T4	MR or SPCC	Vickers Hardness: 70-85 HV; Elongation ≥ 20%	Can lids (requires rigidity for sealing), battery casings, metal signs
ASTM/GB/T	T5	MR or SPCC	Vickers Hardness: 85-100 HV; Elongation ≥ 15%	High-rigidity parts (e.g., aerosol can tops, industrial fastener covers)

9.Special-Purpose Grades
These grades are customized for niche needs (e.g., corrosion resistance, conductivity) by adjusting substrate steel or coating.

Grade Type	Key Features	Standards	Applications
Food-Grade Tinplate	Lead-free tin coating (Pb ≤ 0.005%), BPA-free lacquer compatibility, chromate passivation	ASTM A623M Type R; GB/T 2520 Class 1	All food/beverage packaging (canned meat, baby food, soda)
Electrical Tinplate	Thin tin coating (2-5 g/m² for high conductivity), low carbon substrate	ISO 11950 Class E	Automotive electronic shielding (ECUs, sensors), circuit board components
Weather-Resistant Tinplate	Thick tin coating (10-15 g/m²), enhanced chromate passivation	GB/T 2520 Class 3	Construction roofing sheets, outdoor signboards, marine equipment casings
Lacquer-Compatible Tinplate	Smooth surface (Ra ≤ 0.5 μm), oil-free or low-oil coating	ASTM A623M Type S	High-print cosmetic tins, gift packaging, promotional tins

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FAQ

Q1:What product information do I need to provide?
A:You need to provide the grade, width, thickness and the number of tons you need to purchase.

Q2:What are the shipping ports?
A:You can choose other ports according to your needs.

Q3:About product prices?
A:Prices vary from period to period due to cyclical changes in the price of raw materials.

Q4:What are the certifications for your products?
A:We have ISO 9001, SGS, EWC and other certifications.

Q5:How long does your delivery time take?
A:In general, our delivery time is within 7 - 45 days, and may be delayed if the demand is extremely large or special circumstances occur.