45 U20452 - JB /T 6908-2020 - H2ABC

中文版

Grade	45
	U20452
Corresponding Standard	JB /T 6908-2020 Steel forings for displacement compressors
Classification	Carbon Steel

45 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu
Minimum Value	0.42	0.17	0.5	-	-	-	-	-
Maximum Value	0.5	0.37	0.8	0.035	0.035	0.25	0.3	0.25

45 Mechanical Properties

thickness or diameter mm	Heat Treatment or Condition	Tensile Strength σ_b Mpa	Specified Plastic Yield Strength Rp_0.2 Mpa	Elongation or Extension Rate δ %	Reduction of Area ψ %	Hardness HBW	Impact Energy Absorption KV2 J
≤ 100	Normalizing or Normalizing + Tempering	590~710	≥295	≥15	≥38	170~217	KU2：≥29
＞100~300	Normalizing or Normalizing + Tempering	570~690	≥285	≥15	≥35	170~217	KU2：≥24
＞300~500	Normalizing or Normalizing + Tempering	550~690	≥275	≥14	≥32	170~217	KU2：≥24
＞500~1000	Normalizing or Normalizing + Tempering	530~690	≥265	≥13	≥30	156~217	KU2：≥15
≤ 100	Tempering	630~780	≥370	≥17	≥40	217~302	KU2：≥31; KDVM：≥30
＞100~250	Tempering	590~740	≥345	≥18	≥35	217~286	KU2：≥31; KDVM：≥30
＞250~500	Tempering	590~740	≥345	≥17	≥32	187~255	KU2：≥28; KDVM：≥27

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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