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Home Material GB 6479-2000
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Grade 20
China ISC U20202
Corresponding Standard GB 6479-2000
Seamless Steel Tubes for High-Pressure Chemical Fertilizer Equipments
Classification Carbon Steel
20 Chemical Element Composition Content (%)
Component C Si Mn P S Cr ① Ni ① Cu ① Mo ① V ①
Minimum Value 0.17 0.17 0.35 - - - - - - -
Maximum Value 0.24 0.37 0.65 0.03 0.03 0.25 0.25 0.2 0.15 0.08
20 Mechanical Properties
Heat Treatment or Condition
Tensile Strength
σb
Mpa 		Yield Point
σs
Mpa 		Elongation or Extension Rate
δ
% 		Impact Energy Absorption
KV2
J
normalizing 410~550 ≥245 ≥24 KU2
≥39
• When the final rolling temperature of hot-rolled pipes meets the normalizing temperature, normalizing can be used as a substitute.
• Steel pipes with an outer diameter d≥57mm and a wall thickness T≥14mm shall undergo U-notch impact tests as standard specimens. The evaluation of impact test results shall be in accordance with the provisions of GB/T 17505.
• Except for 12Cr2Mo, for other grades, when the wall thickness T is greater than 16 to 40mm, the yield point is allowed to decrease by 10MPa.
1 Approximate Comparison Table High-Quality Carbon Structural Steel
China Taiwan, China Japan South Korea United States Germany France Russia Sweden United Kingdom
GB ISC CNS JIS KS ASTM/AISI UNS DIN EN/DIN W-Nr. NF EN/NF GOST SS BS EN/BS
20 U20202 S20C S20C SM20C 1020 G10200 C22E
Ck22 		1.1151 C22E
XC18 		20 1435 C22E
070M20
2 Approximate Comparison Table Non-Alloy Steel for Quenching and Tempering
International Organization for Standardization Germany France European Standard
ISO DIN EN/DIN NF EN/NF EN Numerical Grade
C25R Cm22 XC18u C22R
C22R 		1.1149
3 Approximate Comparison Table High-Quality Carbon Structural Steel
China European Standard
GB EN Numerical Grade
20 P235TR1 1.0254
4 Approximate Comparison Table High-Quality Carbon Structural Steel
China Japan United States International Organization for Standardization Germany France European Standard Russia Sweden United Kingdom
GB JIS ASTM ISO DIN EN/DIN W-Nr. NF EN/NF EN Numerical Grade GOST SS BS EN/BS
20 SB410
SGV410
SPV235
SPV24 		A285
A285Gr.C 		P3 ASt35
HI
StE255 		1.0345 A37AP
A37CP 		P235GH 1.0345 12k 1330
1330-01 		141-360
161Gr.360
5 Approximate Comparison Table High-Quality Carbon Structural Steel
China Japan United States International Organization for Standardization Germany European Standard Russia Sweden United Kingdom
GB JIS SAE ISO DIN EN/DIN W-Nr. EN Numerical Grade GOST SS BS EN/BS
20 S20C
S22C 		1020 C25 C22 1.0402 C22 1.0402 20 1450 070M20
6 Approximate Comparison Table High-Quality Carbon Structural Steel
China Japan United States International Organization for Standardization Germany France European Standard Russia Sweden United Kingdom
GB JIS ASTM ISO DIN EN/DIN NF EN/NF EN Numerical Grade GOST SS BS EN/BS
20 SM490B A537CL1 E355 StE355 A510AP
E355R 		P355N 1.0562 15GF 2106 223Gr.490
50DD
7 Approximate Comparison Table High-Quality Carbon Structural Steel
China Japan United States France Russia United Kingdom
GB JIS ASTM/AISI NF EN/NF GOST BS EN/BS
20 S20C 1020 C20
XC18 		20 040A20
050A20
060A20
20 Corresponding Standards(Same grade name, different standards)
1 GB /T 699-1999
20 U20202 20#
2 GB /T 699-2015
20 U20202 20#
3 GOST 1050-1988
20
4 GB /T 17107-1997
20
5 GB 6479-2013
20 U20202
6 GB 6479-2000
20 U20202
7 GB /T 8163-2018
20
8 GB /T 3078-2019
20 20#
9 GB /T 710-2008
20 U20202 20#
10 GB /T 711-2017
20 20#
11 HB /Z 136-2000
20
12 NB /T 47008-2017
20
13 GB /T 13237-2013
20
14 JB /T 6908-2020
20 U20202
15 GB 3522-1983
20
16 GB /T 3087-2022
20

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