[MW:4405] Re: Heat treatment of materials/flanges

Meaning of MT is Material Treated. The details from SA 20M is as
follows ( ASME Section II-A)

Except as allowed by 13.4, plates shall be legibly marked with the
following information: applicable ASTM designation (see 1.1) (year of
issue not required); "G" or "MT" if applicable (see 13.1.2);
applicable grade, type, and class; heat number; plate identifier; and
name, brand, or trademark of the manufacturer (for plates produced in
discrete cut lenghts of flat product) or the processor (for plates
produced from coil and for subdivided plates (see 13.4)
13.1.2 Plates that are required to be heat treated, but have not been
so heat treated, shall be marked by the manufacturer or processor with
the letter "G" (denoting green) following the required ASTM
designation mark, except that "G" marking is not necessary if such
plates are for shipment, for the purpose of obtaining the required
heat treatment, to an organization under the manufacturer's control.
Such plates shall have been qualified for shipment on the basis of
test specimens that have been so heat treated. Plates that are
required to be heat treated, and have been so heat treated, shall be
marked by the party that performed the heat treatment with the letters
"MT" (denoting material treated) following the required ASTM
designation mark.
NOTE 1 — any stress relief of test specimens intended to simulate post-
weld heat treatment is not included in the above heat treatment.

Jaspal Singh, CWI-AWS, CSWIP-3.1
Assistant Manager – Welding Technology
Process Equipment Division
ISGEC, Yamuna Nagar, Haryana -135001
Phone: 911732307389
Ext: 391 Mb: +91 9996624244

On Mar 2, 9:43 am, qaqcmpm <mamujeeb...@gmail.com> wrote:
> 1. In pressure vessel steel plates-SA 516 Gr70MT here what is the
> meaning of MT, is it any additional heat treatment other than
> normalized? some plate MTCs are showing tensile/Yield values after
> stress relieved/PWHTed? Is it a code requiement- if it so the holding
> temp & time information where I will get (for SA 516Gr 70 material &
> SA105/SA350LF2CL1)? Is it like SPWHT of Cr-Mo steels (ASME Sec VIIID2-
> 3.4 Supplemental Requirements for Cr–Mo Steels). Why SPWHT is required
> for Div 1 construction even though we have PQR/WPS for the welding?
>
> 2. And for hot tensile test what is the prescribed temperature for
> test? Is it a code requirement?

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