The Forms We Supply
Four routes cover most of what we quote. Each is a different mill or process route, so the size
window and the lead time differ even where the grade looks similar.
Class 1
Normalized plate for higher strength than A516 with improved toughness, without the cost of quenching.
Pressure vessels, spheres
Class 2
Quenched and tempered plate with the highest strength in the family, for thick-wall low-temperature service.
Heavy reactors, low-temperature vessels
Impact tested plate
Charpy testing at the design temperature, recorded against the heat so the certificate matches the plate.
Cold-service vessels, offshore
Cut and nested heavy plate
Thick plate nested to the shell development, with the weld seams and the grain direction allowed for at the design stage.
Shell courses, heads, heavy nozzles
Size Range and Standard
A537 is quoted by class, thickness and test temperature. The class decides the strength and the price, so it belongs on the enquiry rather than in a note.
Swipe the table sideways for the notes →
| Parameter | Range | What decides it |
|---|
| Classes | Class 1 (normalized), Class 2 (quenched and tempered) | Class 2 gives the higher strength and the tighter toughness. |
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| Yield strength | Around 50 ksi Class 1, around 60 ksi Class 2 | The design calculation uses the value for the class supplied. |
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| Tensile strength | 70 – 90 ksi | The range is defined by the standard for both classes. |
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| Thickness | From 5 mm to 150 mm | Heavy plate is where the heat treatment and the impact testing matter most. |
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| Testing | Tensile and Charpy impact at the specified temperature | The test temperature is stated with the class on the order. |
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| Documentation | Mill certificate showing class, heat treatment and heat number | The certificate is the evidence that the class was applied. |
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Products' Properties and Advantages
A537 is specified for four reasons, and the third is why it exists at all.
Higher strength in a thinner wall
A higher yield at the same thickness means a lighter vessel, or the same pressure in less plate.
Toughness at low temperature
The heat treatment is what delivers impact performance below the range where as-rolled plate is acceptable.
Heat treatment as a specification
Class 2 is quenched and tempered, and that is a property of the delivered plate, not of the chemistry.
Welding with a qualified procedure
Higher strength plate needs a matching procedure and often post-weld heat treatment, which the class and thickness decide.
How We Help Customers
A537 orders are decided by class, thickness and impact temperature. We confirm all three because the class changes both the price and the lead time.
01
Choose the class from the design
Class 1 where normalized plate meets the calculation, Class 2 where the higher yield is needed.
02
Confirm the impact temperature
It decides the test regime and whether the plate can be supplied in that class at that thickness.
03
Set the thickness and the nesting
Heavy plate nesting follows the shell development, and weld seams are minimised at the design stage.
04
Agree the testing and the documents
Tensile, Charpy and any ultrasonic requirement, with the heat treatment recorded on the certificate.
Real Applications
A537 plate is used where a vessel has to be strong and tough at the same time, usually at low temperature.
Low-temperature pressure vessels
Vessels operating below ambient where the impact requirement rules out the standard grades.
Large storage spheres
Spheres and bullets where a thinner wall reduces the weight and the welding on site.
Heavy-wall reactors and columns
Thick plate in Class 2 where the design pressure and the diameter both push the wall up.
Offshore and cold-climate structures
Pressure and structural plate for installations where low temperature is a design condition.
