Which grades to which standard
A purchase order needs two things: the grade and the product standard. This table shows, for the standards we certify to most often, which grades appear under each one and in which product form.
Built from the same grade data as the specification pages, so it cannot drift from what is on the certificates we issue.
Grade plus standard, always
Three sentences on why the second half of that sentence matters as much as the first.
The grade fixes the chemistry
N07718 is a composition window. On its own it says nothing about mechanical properties, test direction or delivery condition.
The standard fixes the rest
ASTM B637 adds the mechanical requirements, the test methods and the marking rules for bar and forgings in that grade. A different form means a different standard.
The certificate is what settles it
At goods-in, the document that decides acceptance is the EN 10204 3.1 or 3.2 certificate — chemistry, mechanical results and the heat number traced to the marking.
Standards: questions buyers ask
The three questions that come up most often about ASTM, ASME and EN designations.
What is the difference between ASTM and ASME designations?
ASTM and ASME publish parallel specifications and the numbers usually track each other — ASTM B163 and ASME SB-163 cover the same seamless tube, for example. The “S” prefix marks the ASME edition. Which one applies is decided by the code your equipment is built to, not by the mill.
Which standard applies to my product form?
The form decides it. Bar, tube, plate and forgings for the same grade sit under different product standards, and the table above shows which form each standard covers in our data.
Do you supply to EN and DIN as well as ASTM?
Yes. Roughly half the table above is European: EN 10088, EN 10216-5, EN 10222-5 and the DIN Werkstoff numbers on the cross-reference page. Name the edition on your order.
Send the grade and the standard.
We will quote against the edition you name, with the documentation that goes with it.