Grade X9Ni9 +NT
Corresponding Standard ISO 9328-4-2018
Nickel-Alloy Steels with Specified Low Temperature Properties
Classification Alloy Steel
X9Ni9 +NT Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni Cu Mo Ti V Nb
Minimum Value - - - - - - 8.5 - - - - -
Maximum Value 0.12 0.3 0.9 0.015 0.015 0.3 9.5 0.4 0.12 0.03 0.05 0.02
X9Ni9 +NT Mechanical Properties
Heat Treatment or Condition
Tensile Strength
σb
Mpa
Yield Point
σs
Mpa
Elongation or Extension Rate
δ
%
Normalizing (+N) plus Normalizing and Tempering (+NT) 690~830 ≥520 ≥18
Approximate Comparison Table Pressure-Bearing Flat Steel
Japan United States International Organization for Standardization
JIS ASTM ISO
SL9N520 A353 X9Ni9 +NT

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