Pre-galvanized steel tubes

are steel pipes that undergo a galvanization process before forming. This method provides a protective zinc coating to prevent corrosion and extends the lifespan of the steel. Pre-galvanized tubes comply with standards like ASTM A53, EN 10219, or BS 1387. Common material grades include Q235, Q195, and S235JR.

Key Comparisons on Q235B, Q355B, ST37, ST52 galvanized steel pipe:

Strength:

Q235B and ST37 have lower yield and tensile strength compared to Q355B and ST52.
Q355B and ST52 are better for heavy-duty applications requiring high strength.

Composition:

Q235B and ST37 are similar in chemical makeup, mainly being mild steels.
Q355B and ST52 include more manganese, contributing to higher strength and toughness.

Standards:

Q235B and Q355B are based on Chinese GB standards.
ST37 and ST52 follow German DIN standards.

Applications:

Q235B/ST37: General structural purposes.
Q355B/ST52: Heavier, more demanding applications like bridges and pressure vessels.

Equivalents:

Q235B ≈ ASTM A36, S235JR.
Q355B ≈ ASTM A572 Gr.50, S355JR.
ST37 ≈ ASTM A283 Grade C.
ST52 ≈ ASTM A572 Grade 50.

Galvanized steel tube GB standard Q195 Q235 Q355 steel grades comparison

  Select appropriate materials for your specific structural or mechanical requirements, Contact us today!