Mô tả

1. Differences in Origin & Scope of Application

• JIS (Japan)

→ Widely used in Japan, Southeast Asia, and Japanese factories in Vietnam

→ Very common for steel plates, coils, and structural steel

• ASTM (USA)

→ Globally popular, especially in international projects

→ Very strong in testing and material standards

• BS (UK)

→ Traditional in the UK and Commonwealth countries

→ Many parts have now switched to EN (Europe)

• GB (China)

→ Used for domestic Chinese steel and competitively priced exports

→ Commonly found in imported goods to Vietnam

2. Differences in Steel Grade Naming Conventions

• JIS (easy to read – according to intended use)

Example: SS400

SS = Structural Steel (structural)

400 = minimum tensile strength (MPa)

• ASTM (according to standard code + grade)

Example: A36

A = ferrous metal

36 = yield strength (ksi)

• BS (combination of letters + numbers)

Example: S275

S = Structural

275 = yield strength (MPa)

• GB (more complex – similar to JIS but with variations)

Example: Q235

Q = Yield (yield strength)

235 = MPa

3. Differences in Composition & Mechanical Properties

• JIS → Strict regulations on both chemical composition and mechanical properties

• ASTM → More flexible, focusing on usability and testing

• BS/EN → Very clear on yield strength and quality grading

• GB → May vary more between manufacturer 

4. Differences in Testing Methods

ASTM → Strongest in testing systems (tensile, impact, corrosion...)

JIS → Thorough testing, geared towards industrial production

GB → Sometimes differs from ASTM/JIS → Requires careful inspection when importing goods


5. Easy-to-remember conclusion

JIS = easy to read, widely used in Asia

ASTM = the strongest international standard for testing

BS = predecessor of EN (Europe)

GB = good price, requires careful quality control