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JIANGSU MITTEL STEEL INDUSTRIAL LIMITED
Jiangsu Mittel Steel Industrial Limited Supply all kinds of Stainless Steel Sheet/Plate/Coil/Round ,Flat ,Angle bar/stainless steel seamless pipe /welded pipe /Elbow/Flange /Galvanized Steel sheet
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Hot Rolled Steel Round Bar Hot Rolled Alloy Bar 18Crnimo7-6 Equivalent Astm

JIANGSU MITTEL STEEL INDUSTRIAL LIMITED
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JIANGSU MITTEL STEEL INDUSTRIAL LIMITED
City: Wuxi
Province/State: Jiangsu
Country/Region: China
Tel: 86-0510-88680060
Contact Person:
Mr Gao Ben

Hot Rolled Steel Round Bar Hot Rolled Alloy Bar 18Crnimo7-6 Equivalent Astm

Brand Name : Mittel
Model Number : 18Crnimo7-6
Certification : SGS MTC ISO
Place of Origin : China
MOQ : 5 Tons
Price : 1290 USD/Ton
Payment Terms : L/C, T/T, Western Union, MoneyGram
Supply Ability : 600 Tons per year
Delivery Time : 7 days
Packaging Details : Export Packing
OD : 6-600MM
Surface : Black and Bright
Type : Hot Rolled and Cold Drawn
Condition : Heat Treatments
Length : 3-12m
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The failure cause of the 18CrNi3Mo steel for drilling bit, including inclusions, prior austenite grain size, carburized layers, and morphology of the fatigue fracture, was investigated by optical microscope, quantitative metallography, and scanning electron microscope. Results show that the failure of the drill bit is not related to interior inclusions or the inhomogeneity of the prior austenite grain size distribution. The failure is related to geometrical discontinuities causing stress concentration along the tooth profiles while under effect of continuous twisting and axial impact. Thus, the crack initiates in these areas, and the microstructures of the carburized layer, the transitive layer, and the matrix are all tempered martensite such that the crack propagation cannot be effectively restrained and the crack propagates quickly, causing premature failure of the drilling bit.

Keywords

18CrNi3Mo steel Failure analysis Fracture Fatigue crack

Grade :18CrNiMo7-6
Number:1.6587
Classification:Alloy special steel
Standard:
EN 10084: 2008 Case hardening steels. Technical delivery conditions
Equivalent grades:Go here


Chemical composition % of steel 18CrNiMo7-6 (1.6587): EN 10084-2008

Elements not quoted in this table shall not be intentionally added to the steel without the agreement of the purchaser, other than for the purpose of finishing the heat.
Steels with improved machinability as a result of the addition of lead or higher sulfur contents, depending on the manufacturing process up to around 0.1 % S, may be supplied on request. In this case, the upper limit of the manganese content may be increased by 0.15 %
CSiMnNiPSCrMo
0.15 - 0.21max 0.40.5 - 0.91.4 - 1.7max 0.025max 0.0351.5 - 1.80.25 - 0.35


Mechanical properties of steel 18CrNiMo7-6 (1.6587)

Nominal thickness (mm):to 16
Rm - Tensile strength (MPa) hardening and tempering at 2001200

Brinell hardness (HBW): (+S)255
Brinell hardness (HBW): (+A)229
Brinell hardness (HBW): (+TH)179 - 229
Brinell hardness (HBW): (+FP)159 - 207


Equivalent grades of steel 18CrNiMo7-6 (1.6587)
Warning! Only for reference

EU
EN
Germany
DIN,WNr
France
AFNOR
England
BS
Italy
UNI
China
GB
Finland
SFS
Inter
ISO
18CrNiMo7-6
17CrNiMo6
17CrNiMo7
18NCD6
820A16
18NiCrMo7
17Cr2Ni2Mo
511
18CrNiMo7


NEW opportunities for buyers!
Post free buying requirement of steel 18CrNiMo7-6 (1.6587)

Mechanical properties

ReHMinimum yield strength / Mindestwert der oberen Streckgrenze / Limite d elasticite minimale
RmTensile strength / Zugfestigkeit / Resistance a la traction
AMinimum elongation / Mindestwert der Bruchdehnung / Allongement minimal
JNotch impact test / Kerbschlagbiegeversuch / Essai de flexion par choc


Heat treatment conditions

+ASoft annealed
+ACAnnealed to achieve spheroidization of the carbides
+ARAs rolled
+ATSolution annealed
+CCold drawn / hard
+CRCold rolled
+FPTreated to ferrite-pearlite structure and hardness range
+IIsothermal annealing
+LCCold drawn / soft
+MThermo mechanical rolling
+NNormalized
+NTNormalized and tempered
+PPrecipitation hardened
+PEPeeled
+QAAir quenched and tempered
+QLLiquid quenched and tempered
+QTQuenched and tempered
+STreated to improve shearability
+SHAs rolled and turned
+SRCold drawn and stress relieved
+TTempered
+THTreated to hardness range
+WWWarm worked
+UUntreated

Alloy special steel
Chemical composition of steel 18CrNiMo7-6 (1.6587), Standards of steel 18CrNiMo7-6 (1.6587)
Mechanical Properties of steel 18CrNiMo7-6 (1.6587) Equivalent grades of steel 18CrNiMo7-6 (1.6587)
Tensile Strength, Elongation, Proof strength, Hardness


























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