Martensitic grades 1.4006, 1.4021, 1.4028, 1.4028Mo, 1.4034, 1.4037 stainless steel strip coil

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US $1,000-10,000 / Metric Tons | 1 Metric Ton/Metric Tons 1.4021 stainless steel strip (Min. Order)
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Overview
Quick Details
Grade:
400 Series
Standard:
DIN, EN
Thickness:
0.1mm ~ 3.0mm
Width:
5~350mm
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
product form:
cold rolled precision steel strip, coil
delivery state:
annealed
SupplyAbility
SupplyAbility:
500 Metric Ton/Metric Tons per Month
Packaging & Delivery
Packaging Details
seaworthy packaging.
Port
shanghai, china
Lead Time :
35 days after receipt 30% of value.

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

 

products in forms of hot and cold rolled steel strip, coil, sheet and plate.

GradeCSiMnCrMo
1.40060.08~0.151.00 max1.00 max11.50~13.50-
1.40210.16~0.251.00 max1.50 max12.00~14.00-
1.40280.26~0.351.00 max1.50 max12.00~14.00 
1.4028Mo0.34~0.381.00 max1.00 max13.00~14.000.90~1.10
1.40310.36~0.421.00 max1.00 max12.50~14.50-
1.40340.43~0.501.00 max1.00 max12.50~14.50-
1.40370.58~0.701.00 max1.00 max12.50~14.50-

 

Your contact - we are specialized in the high performance stainless martensitic steels.
Paul 
skype: paul_luhongxiang
cell: 86 15190257143
export @ ahoneststeel.com

 

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.