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Home Material GB /T 3098.24-2020
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Performance Level 718
Other Names
Corresponding Standard GB /T 3098.24-2020
Mechanical properties of fasteners-Stainless steel and nickel alloys bolts, screws, studs and nuts for high temperature applications
Classification Nickel and Nickel Alloys
Properties Corrosion Resistance
718 Chemical Element Composition Content (%)
Component C ② Si Mn P S Cr Ni Cu Mo Ti Nb B Co Al More
Minimum Value 0.02 - - - - 17 50 - 2.8 0.6 4.75 0.002 - 0.3 Fe:余量
Maximum Value 0.08 0.35 0.35 0.015 0.015 21 55 0.3 3.3 1.2 5.5 0.006 1 0.7
718 Mechanical Properties
condition Heat Treatment or Condition
Tensile Strength
σb
Mpa 		Yield Point
σs
Mpa 		Elongation or Extension Rate
δ
% 		Hardness
HBW
Bolts, screws, studs; all sizes Solution Heat Treatment (+AT) + Precipitation Hardening (+P) ≥1230 ≥1030 ≥0.2d HRC
36~48
Nuts; all sizes Solution Heat Treatment (+AT) + Precipitation Hardening (+P) ≥1230 36~48
718 Corresponding Standards(Same grade name, different standards)
1 YJT
718 3Cr2MoNi
2 GB /T 3098.24-2020
718 NiCr19NbMo UNS N07718 合金 718
3 Q/BQB 135-2009
718

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