A537 Class 1 normalized steel plates

1.What chemical components are contained in ASTM A537 Class 1 normalized steel plates？

2.What is the difference between A 537 Class 1 and  A 537 Class 2?

Heat Treatment

• Class 1:
• As-rolled or normalized(no quench & tempering).
• Less intensive heat treatment, resulting in lower strength but better weldability.

• Class 2:
• Quenched and tempered (Q&T).
• Higher strength due to controlled heating and rapid cooling.

Applications

• Class 1:
• Used in moderate-pressure environments(e.g., storage tanks, low-stress structural components).
• Preferred where weldabilityis critical (e.g., field-welded constructions).

• Class 2:
• Designed for high-pressure/high-stressapplications (e.g., pressure vessels, offshore platforms, nuclear containment).
• Common in critical infrastructurerequiring superior strength-to-weight ratios.

Cost & Availability

• Class 1: Generally lower cost(simpler manufacturing process).
• Class 2: More expensive due to Q&T process but offers better performancein demanding conditions.

3.What are the typical industrial uses of ASTM A537 Class 1 steel plates?

Manufacturing of Pressure Vessels

• Petrochemical Industry Applications
• Storage tanks & reaction vessels
• Cryogenic storage equipment for LPG/LNG (maintains toughness at -45°C)

• Construction & Infrastructure
• Large-scale bridge support structures
• Power plant boiler shells & mid-temperature pressure components (service temperature ≤370°C)

• General Industrial Equipment
• Digesters for papermaking machinery
• Large sterilization vessels for food industry (benefits from superior weldability)

Key Features Highlighted:

• Welding-friendly– No complex post-weld heat treatment (PWHT) required
• Cryogenic reliability– Charpy impact tested at -45°C (typical value ≥27J)
• Cost-effective– Optimal solution for medium/low-pressure applications