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8/10/2019 TMCP Structural Steels Weldability
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Have you experienced the technical and commercial advantage of choosing TMCP
steel plates ?
The steel plates produced by TMCP have not only High Strength and toughness but
also outstanding weldability.
Conventionally it has been impossible to obtain these characteristics simultaneously
and one had to be chosen at the expense of the other.
But thanks to the development of TMCP, this revolutionary steel plate is now available.
Enjoy the benefits this new steel during fabrication and welding.
We're proud that JFE was the world's first company to develop the process for TMCPand has led TMCP technology ever since.
TMCPTMCP
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Fabrication Benefits by TMCP Steel PlatesFabrication Benefits by TMCP Steel Plates
Fabrication Benefits by TMCP Steel PlatesFabrication Benefits by TMCP Steel Plates
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Adding carbon and/or alloying elements is a well-known
procedure to increase strength, but this also increases Ceq and sodeteriorates weldability. The above figures show that TMCP offers
specific strength with low Ceq which improves weldability.
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Low Ceq obtained by TMCP offers
high toughness at the heat affected
zone of the weld, even when high
heat input welding is used for high
efficiency.
Additional Information
HAZ toughness is further improved
by special chemical treatment.
The treated plates are used in
combination with TMCP under high
heat input welding for low
temperature service. Please inform
us of the toughness requirementunder high heat input welding, and
we'll investigate.
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Characteristics of TMCP and Properties of
the Plates with Minimum Tensile Strength
Grade 550610N/mm2
Characteristics of TMCP and Properties of
the Plates with Minimum Tensile Strength
Grade 550610N/mm2
PartPart
Typical TMCP plates with high weldability, for which applicationsto JIS and other standards have been submitted for bridges.
penstocks, tanks and others, are presented below.
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Features of Chemical CompositionFeatures of Chemical Composition
Examples of Mechanical PropertiesExamples of Mechanical Properties
In order to attain high weldability,carbon and impurity elements are
severely restricted. Notably, a crack sensitivity parameter PCMis
introduced, and phosphorus is also reduced to achieve high toughness
under high heat input welding.
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Bead on plate Maximum HardnessBead on plate Maximum Hardness
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Forming & Heat treatmentForming & Heat treatment
Hot
Forming
Hot forming deteriorates the received
performance, and then is prohibited.
When hot forming is necessary,
please consult with JFE prior to order
Cold forming or warm forming
is available.
Temperature under 580C for
warm forming is recommended.
PWHT, if necessary, is recommended to be
excuted under 580C.
When PWHT is necessary,
please consult with JFE steel prior to order.
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Available Specification for TMCPAvailable Specification for TMCP
When a customer requests TMCP plates instead of conventional ones, please inform
us as we would like to design the chemical composition in line with the customer's
requirements, such as Ceq or PCM, plate thickness, applicable standard, and PWHT ifnecesarry, and we will also meet special toughness requirements other than the
standard, etc, and will inform the customer of our design results.
Many ASTM specifications are in force worldwide, and TMCP meets several of
them as shown above. If a material specification has already been selected in the
detail design and the specification does not allow TMCP, it is recommendable that
the specification be changed, if possible, to allow the use of TMCP.
In this case, there may be small differences in mechanical properties andchemical composition between the changed standard and the original one.
However, the properties can be adjusted in accordance with the original ones.
The specifications shown above are just typical examples ; TMCP is also applicable
in other specifications.
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