Hi Prasant,
Thermo-Mechanical Control Process (TMCP), is a controlled rolling processes. TMCP produces fine-grained steel by a combination of chemical composition and integrated controls of manufacturing processes from slab reheating to post-rolling cooling. There are 2 variations:-
- Thermo-Mechanical Rolling (TMR):- fine grain size are produced by rolling in the recrystallization and the non-recrystallization regions of austenite, and sometimes in the dual-phase temperature region of austenite and ferrite.
- Accelerated Cooling (AC):- steels meeting the specified requirements are produced by promoting grain refinement and increasing the pearlite and/or bainite volume fraction through controlled cooling (accelerated cooling and air cooling) immediately after the final controlled rolling (CR) or TMR operation.
AR- stands for as rolled condition.Plate are heated above the AC3 temperature range and rolled in continuation ( either in a single operation or multiple rolling cycles as required).Plates usually requires normalizing following rolling.
Pleas see the schematics below, which clearly outlines different processes. TMCP steels may be produced either by TMR or AC process, both producing the similar steels with extremely high integrity
Pradip Goswami,P.Eng.IWE
Welding & Metallurgical Specialist & Consultant
Ontario,Canada.
Email-pgoswami@sympatico.ca,
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of prashant pansare
Sent: Thursday, September 01, 2011 10:59 AM
To: mat wel
Subject: [MW:12330] process of AR-N & TMCP steel plates
| Dear All, What is the difference bet'n manufactring process of AR-N & TMCP steel plates? Thanx & Regds, PSP |
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