2026 Version: How to Identify High-Quality Chinese Galvanized Coils Through MTC (Material Test Certificate)?

For the export trade of galvanized coils, the MTC (Material Test Certificate) is the "core document" to determine product quality and avoid procurement risks. It is not only a necessary document for export customs clearance, but also a key basis for customers to verify whether the product meets their own needs and is consistent with the quotation commitments. Especially in 2026, as China's galvanized coil exports face the background of mandatory export license compliance, carbon tariff implementation, and normalized anti-dumping, learning to identify high-quality products through MTC can not only avoid purchasing "low-cost and inferior goods", but also take the initiative in international trade and establish long-term cooperative trust.

This tutorial will deeply dissect the core content of a standard Chinese galvanized coil MTC, focus on the 3 key indicators most concerned by export customers (yield strength, zinc coating weight, and passivation method), teach you to read each parameter step by step, and reveal the "fraud tricks" of low-cost galvanized coils on MTC, helping you establish a clear industry quality judgment standard.

A compliant and effective Chinese galvanized coil MTC is the premise for identifying high-quality products. Especially for export orders, MTC must meet the following basic requirements; any missing item needs to be vigilant (it is likely to be non-compliant or inferior products):

Important Reminder: Since 2026, export galvanized coils (including hot-dip galvanized, electro-galvanized, and zinc-aluminum-magnesium coils) need to be accompanied by an export license. The product specifications and materials on the MTC must be completely consistent with the export license, otherwise customs clearance will be affected.

The core quality of galvanized coils is reflected in three dimensions: "mechanical properties (yield strength), corrosion resistance (zinc coating weight), and corrosion resistance stability (passivation method)". These are also the three most critical parameters on the MTC, which directly determine the product's application scenarios and service life (different scenarios such as construction, home appliances, and automobiles have great differences in parameter requirements).

Yield strength is the core indicator of galvanized coils to resist external forces and avoid deformation, expressed as "σs" in MPa (megapascal). It directly affects the product's processing and forming (such as bending and stamping) and use safety (such as building load-bearing and home appliance casings).

✅ Requirements for marking on high-quality MTC (commonly used export standards):

❌ Tricks of low-cost goods: Deliberately vague yield strength (e.g., only writing "meets standards" without marking specific values); or marking false values (e.g., actual σs=400MPa, but marked as ≤345MPa), leading to easy fracture and deformation of the product during processing, which cannot meet customer needs.

The zinc coating is the "corrosion barrier" of galvanized coils. The zinc coating weight (unit: g/㎡) directly determines the corrosion resistance of the product in different environments. Export customers need to choose the corresponding zinc coating specification according to the climate of the destination (such as coastal high salt spray, high temperature and dry in the Middle East), and the marking on the MTC must be accurate.

✅ Requirements for marking on high-quality MTC (mainstream export specifications):

❌ Tricks of low-cost goods: Falsely mark the zinc coating weight (e.g., actual Z100, marked as Z120); only mark the "single-sided zinc coating" to mislead customers into thinking it is the total double-sided weight; or use "zinc coating thickness (μm)" instead of "weight" to avoid insufficient actual weight (1g/㎡≈1.4μm, which can be converted and verified by yourself).

Passivation treatment is the "secondary corrosion protection" of galvanized coils, aiming to prevent the zinc coating from oxidizing, whitening and peeling, and extend the product's corrosion resistance life. Especially for long-distance export transportation (high-humidity marine environment) and harsh service scenarios, the choice of passivation method is crucial, which must be clearly marked on the MTC.

✅ Requirements for marking on high-quality MTC (mainstream export passivation methods in 2026):

❌ Tricks of low-cost goods: Do not mark the passivation method, or mark "environmental protection passivation" but fail to provide relevant test reports; use "simple oiling" instead of passivation treatment, leading to oxidation and whitening of the zinc coating during marine transportation, and customers cannot use the goods normally after receipt, even leading to claims.

In addition to the above 3 core indicators, export customers also need to verify the authenticity of MTC through the following 4 points to further confirm product quality and avoid pitfalls:

Remember the following rhyme to quickly identify high-quality Chinese galvanized coils through MTC and avoid low-cost traps:

"Complete qualifications without blanks, yield strength marked specifically; zinc coating weight written on both sides, passivation method clear; composition and specifications match the order, ambiguous and altered ones are all abandoned."

For export customers, MTC is not only a "qualification certificate", but also a reflection of the supplier's strength and product quality. In 2026, the compliance requirements for galvanized coil exports will be improved. Choosing a supplier that can provide standardized and authentic MTC can not only avoid trade disputes, but also establish a good brand reputation in the overseas market and achieve long-term and stable cooperation.