Below we briefly explain the grades and finishes of structural steel that we supply.
WHAT DO JR & J2 MEAN?
JR and J2 refer to the mechanical characteristics of steel, specifically Charpy Impact tests.
The Charpy Impact test, also known as the Charpy V-notch test, is a standardised high strain-rate test that involves striking a horizontally placed notched specimen with a pendulum. The impact test helps measure the amount of energy absorbed by the specimen during fracture.
The J means that the test was conducted with 27 joules of energy. This is followed by either an R for room temperature, or a number referring to the temperature the tests were conducted at. So JR is room temperature (plus 20 degrees) J0 is 0 degrees and J2 is -20 degrees.
WE OFFER PICKLED AND OILED S275JR AND S355JR, WHAT DOES THIS MEAN?
Hot rolled steel products will oxidise through contact with oxygen and water vapour in the atmosphere after the forming process. To prevent this, the metal sheet or coil is passed through a pickling line. This is a bath of hydrochloric acid that removes any oxide scale that might have occurred during processing. Once the metal has passed through the acid bath it is rinsed, dried and then lightly oiled to protect the material from oxidisation. Pickling and oiling creates a clean surface finish, making it a much more user-friendly product for the laser cutting market.
WHAT IS DRY S275JR AND DRY S355JR?
Hot-rolled pickled dry steel sheet and coil is also descaled of oxides in a bath of hydrochloric acid and rinsed, but the material is not oiled afterwards.
If you require laser cut structural steel sheet or plate components, you can find out more about the thicknesses, grades and finishes we supply on our mild steel page. If you know what you need email our sales team for a competitive quote firstname.lastname@example.org.