Grade R-26
Corresponding Standard DL /T 439-2018
The Technical Guide for High-Temperature Bolt of Fossil-Fired Power Plant
Classification Nickel and Nickel Alloys
R-26 Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni Mo Ti B Co Al More
Minimum Value - - - - - 16 35 2.5 2.5 0.001 18 - Fe:余量
Maximum Value 0.08 1.5 1 0.03 0.03 20 39 3.5 3 0.01 22 0.25
R-26 Mechanical Properties
condition Test Temperature Tensile Strength
σb
Mpa
Yield Point
σs
Mpa
Elongation or Extension Rate
δ
%
Reduction of Area
ψ
%
Hardness
HBW
Impact Energy Absorption
KV2
J
Bolt Material Room Temperature ≥1000 ≥555 ≥14 ≥20 262~331

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