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Quick Details

  • Grade: 400 Series
  • Standard: DIN, EN
  • Thickness: 0.1mm ~
  • Width: 1250mm
  • Length: in coils
  • Place of Origin: Jiangsu, China (Mainland)
  • Brand Name: Changjiang
  • Model Number: 1.4006, 1.4021, 1.4028, 1.4028Mo, 1.4034, 1.4037
  • Technique: Cold Rolled
  • Application: knives, scissors, blades, shears...
  • Certification: ROHS

Packaging & Delivery

Packaging Details seaworthy packaging.
Delivery Time within 25 working days

Martensitic grades 1.4006, 1.4021, 1.4028, 1.4028Mo, 1.4034, 1.4037 stainless steel strips

 

Martensitic stainless steels
The martensitic stainless steels generally
have chromium contents ranging from 11.5
to 18% and carbon levels between 0.15 and
1.2%. A noteworthy application is for cutlery
manufacture. The microstructure of these
materials on delivery usually consists of a
uniform dispersion of carbides in ferrite, although
some thin strip is supplied in the asquenched
condition. Before use, for example
in cutlery, quenching and tempering is therefore
normally necessary to obtain a fully martensitic
structure with no chromium carbides.
In order to develop a completely martensitic
structure, it is necessary to heat the metal
into the single phase austenite field, above
the Ac3 transformation point, generally of the
order of 900 °C, depending on the chromium
and carbon contents. For alloys with between
11.5 and 13.5% Cr and carbon contents less
than 0.15%, the Ac3 point is situated at about
920 °C and austenitizing is performed between
950 and 1100 °C. For carbon contents
between 0.15 and 0.5% and chromium levels
from 12 to 16%, Ac3 lies between 850 and
900 °C and austenitizing is also carried out
in the range from 950 to 1100 °C. For grades
containing 0.6 to 1.2% C and 17 to 18% Cr, Ac3
is between 830 and 860 °C and quenching is
performed from temperatures between 1000
and 1050 °C. Finally, there is a fourth category
of stainless steels, with less than 0.2% C and
from 12 to 18% Cr, and also containing from
1.5 to 5% Ni, whose Ac3 is between 800 and
900 °C and which are austenitized between
950 and 1000 °C.
The holding time at the austenitizing temperature
depends on the thickness, and must be
long enough to allow complete solutioning of
all chromium carbides. Subsequent cooling
down to ambient temperature must be effective
in less than one minute. For thin sections,
natural or forced air cooling is often sufficient,
whereas oil quenching is necessary for thicknesses
greater than about 5 mm. If chromium
carbides are observed after cooling, either
the austenitizing temperature was too low or
the holding time too short. The hardness will
then be too low, since the carbon content of
the martensite is reduced, and the corrosion
resistance may also be impaired.
In high carbon grades, the austenite does
not transform fully to martensite on cooling
to room temperature, and the presence of
residual austenite lowers the overall hardness.
The transformation can be effectively
completed with the aid of a cryogenic treatment
at about -80 °C. The thermal shock induced
during rapid cooling generates internal
stresses which can cause embrittlement.
In order to improve the ductility and toughness,
a stress relieving treatment is therefore
performed, involving heating for a few hours
at 150 to 300 °C. It is absolutely essential to
avoid the temperature range 400-600 °C, in
which chromium carbide precipitation can
occur, accompanied by chromium depleted
zones which can make the alloy sensitive to
intergranular corrosion.

 

Contact Paul, export at ahoneststeel dot com, skype: paul_luhongxiang, whatsapp: 0086 151 9025 7143

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