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Grade 20
U20202
Corresponding Standard JB /T 6908-2020
Steel forings for displacement compressors
Classification Carbon Steel
20 Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni Cu
Minimum Value 0.17 0.17 0.35 - - - - -
Maximum Value 0.23 0.37 0.65 0.035 0.035 0.25 0.3 0.25
20 Mechanical Properties
thickness or diameter
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
≤ 100 Normalizing or Normalizing + Tempering 390~470 ≥215 ≥24 ≥53 105~156 KU2：≥54
＞100~300 Normalizing or Normalizing + Tempering 370~470 ≥205 ≥23 ≥50 105~156 KU2：≥49
＞300~500 Normalizing or Normalizing + Tempering 360~470 ≥195 ≥22 ≥45 105~156 KU2：≥49
＞500~1000 Normalizing or Normalizing + Tempering 350~470 ≥185 ≥20 ≥40 105~156 KU2：≥38
20 Corresponding Standards(Same grade name, different standards)
1 GB /T 699-1999
20 U20202 20#
2 ISO 4955-2005
(20) X8NiCrAlTi32-21
3 GB /T 699-2015
20 U20202 20#
4 GOST 1050-1988
20
5 ISO 683-13-1986
20
6 GB /T 17107-1997
20
7 GB 6479-2013
20 U20202
8 GB /T 8163-2018
20
9 ISO 4955-2016
(20) X8NiCrAlTi32-21 4876-088-00-I
10 GB /T 3078-2019
20 20#
11 GB /T 710-2008
20 U20202 20#
12 GB /T 711-2017
20 20#
13 HB /Z 136-2000
20
14 NB /T 47008-2017
20
15 GB /T 13237-2013
20
16 JB /T 6908-2020
20 U20202
17 GB 3522-1983
20

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