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Grade 45
Corresponding Standard NB /T 20008.12-2010
other material for pressurized water reactor nuclear power plants-Part 12: Forged or rolled bars for class 1,2,3 bolts and nuts
Classification Carbon Steel
Properties Strength Machinability
Density 7.85 g/cm3
45 Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni Mo More
Minimum Value 0.42 - 0.5 - - - - - Cr+Mo+Ni≤0.63
Maximum Value 0.5 0.4 0.8 0.03 0.035 0.4 0.4 0.1
45 Mechanical Properties
diameter(thickness)
d
mm		 Heat Treatment or Condition
Tensile Strength
σb
Mpa 		Specified Plastic Yield Strength
Rp0.2
Mpa 		Elongation or Extension Rate
δ
% 		Reduction of Area
ψ
% 		Hardness
HBW 		Impact Energy Absorption
KV2
J
d≤16① Austenitizing at 840°C, water quenching, and tempering at ≥600°C." 700~850 ≥490 ≥14 ②
≥35		 201~285
16＜d≤40① Austenitizing at 840°C, water quenching, and tempering at ≥600°C." 650~800 ≥430 ≥16 ②
≥40		 201~285
40＜d≤100① Austenitizing at 840°C, water quenching, and tempering at ≥600°C." 630~780 ≥370 ≥17 ②
≥45		 201~285
Bar③④ 0°C
≥41
45 Corresponding Standards(Same grade name, different standards)
1 GB /T 699-1999
45 U20452 45#
2 GB /T 699-2015
45 U20452 45#
3 GOST 1050-1988
45
4 GB /T 17107-1997
45
5 NB /T 20008.12-2010
45
6 Q/BQB 517-2018
45
7 GB /T 3078-2019
45 45#
8 GB /T 710-2008
45 U20452 45#
9 GB /T 711-2017
45 45#
10 HB /Z 136-2000
45
11 DL /T 439-2018
45
12 GB /T 41157.2-2022
45 45
13 GB /T 13237-2013
45
14 JB /T 6908-2020
45 U20452
15 GB 3522-1983
45

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