Process of Steel Manufacturing

Steel Manufacturing Process as such cannot be mentioned but yes the information regarding 1. Treatment after production, 2. confirmity to the production according to contract document is essential to mention in the certificate.

3. the standards used for production that at end give information of whether the manufactured product complies to the end requirement -

eg1. Cladding

-Cold reduced, hot rolled

BS 1449.1 (production standard)

BS 2989/EN 10142 galvanized formed steel

Grades: Z28 (fy = 280 MPa) Z35 (fy = 350 MPa)

eg2. Plate and Rolled Steel

BS 4360 or EN 10025

{Grade 43 (fy = 275 MPa) {Grade 50 (fy = 335 MPa)

So check whether similar production confirming standards are mentioned in it or not and whether the certificate contains the declaration of the confirmance to production & testing standards.

Grain Size information in Certf depends on: 1.purpose of application i.e end usage eg. structural, static/dynamic application, resistant to rigorous wear/friction

2. Strength of material -whether compressive or elongative strains will be applicable

Mill Test Report has column for grain test, but many times it is kept blank.

The test must be in contract agreement whether to perform Grain Sizing test on every lot or sample lot.

I cant comment the validity of the Mill Report you have, but, you can insist the Manufacturer to disclose the manufacturing process standards & Grain Size, he can give in in form of Declaration on Letter head mentioning the Dispatched Lot reference and confirmity of it w.r.t the Grain size & Processes.

Another thing to be taken care for next time:

Always ask the report format to manuafacturer which he will be delivering along with the product. that will ensure that all the contarct terms agreed reflect in the end Mill report as well as we can derive that product will be incomplience to the requirement stated in contract. After all the Confirming Standards & the Test Report is the only thing that we can believe. I have witness that the the product for marine grade shaft was declared with relavant EN standard & Grain Size but during sample testing in our authorised lab, it failed, so this indicate that the certificate was FAKE or The Lot sent was Wrong or then the sample test size if applicable was not according to required statistical Sample Size requirement.