In Thailand's metal fabrication and forming industries, whether stamping, casting, or machining, the steel used must comply with industry standards. Commonly recognized standards include:

1. ASTM (American Society for Testing and Materials), a US standard widely accepted globally.

2. JIS (Japanese Industrial Standards), a Japanese standard prevalent in Thai industry (primarily used by Japanese factories and Thai automotive companies).

3. EN (European Standard), a European standard. Factories producing for export to Europe must use steel with EN certification to meet CE Marking regulations.

4. TIS (Thai Industrial Standards Institute), overseen by the Thai Industrial Standards Institute (TISI), which sets guidelines for quality manufacturing.

In addition to the aforementioned industry standards, official material certifications verifying the composition, strength, and mechanical properties of steel products ensure quality assurance for manufacturers, contractors, and engineers, guaranteeing that the materials meet required specifications. Steel quality certification comes in various forms, with the most widely accepted being, Mill Test Reports (MTRs) typically include:

• Chemical Composition: Percentage of carbon, manganese, sulfur, phosphorus, and other elements in the steel.
• Mechanical Properties: Yield strength, tensile strength, elongation, and hardness.
• Material Heat Number: A unique code assigned to each batch of steel during production, enabling complete traceability from raw materials to the finished product.
• Heat Treatment Details: If applicable, the report may include information on heat treatment techniques such as annealing, surface hardening, precipitation strengthening, tempering, carbonization, normalization, and rapid hardening.

To achieve the optimal composition for a workpiece, especially for those prioritizing safety, high purity, and international manufacturing standards, using a certified metal compound as raw material is essential for three reasons:

1.  Traceability: Identifies the batch and allows immediate tracing back to the original
     furnace in case of workpiece problems.
2. Guaranteed Mechanical Behavior: Allows engineers to accurately calculate
   tonnage to prevent problems such as steel being too hard, causing the mold to crack,
   or too soft, unable to withstand the force.
3. Increase confidence with global partners, enhancing competitiveness, especially
   in the automotive (e.g., IATF 16949 standard) or aerospace industries. Using
   uncertified materials is strictly prohibited.

source

https://www.salika.co/2025/04/04/steel-standard-quality/

https://mainlinemetals.com/the-importance-of-material-certification-in-steel-distribution/