20 - GB /T 17107-1997

Grade	20
Corresponding Standard	GB /T 17107-1997 Structural Steel Grades And Mechanical Property For Forgings
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	0.24	0.37	0.65	0.035	0.035	0.25	0.25	0.25

• High-quality steel——P≤0.035；S≤0.035；Cu≤0.3；Cr≤0.3；Ni≤0.3
• Extra-quality steel （Suffix A）——P≤0.025；S≤0.025；Cu≤0.25；Cr≤0.3；Ni≤0.3
• Special High-Quality Steel (Suffix E)——P≤0.025；S≤0.015；Cu≤0.25；Cr≤0.3；Ni≤0.3

• Cu is not more than 0.3% when smelting scrap steel

20 Mechanical Properties

diameter or thickness d mm	Mark	Heat Treatment or Condition	Tensile Strength σ_b Mpa	Yield Point σ_s Mpa	Elongation or Extension Rate δ %	Reduction of Area ψ %	Hardness HBW	Impact Energy Absorption KV2 J
d≤100	Sample Direction: Longitudinal	Normalizing or normalizing + tempering	≥340	≥215	≥24	≥50	103~156	≥43
100＜d≤250	Sample Direction: Longitudinal	Normalizing or normalizing + tempering	≥330	≥195	≥23	≥45	103~156	≥39
250＜d≤500	Sample Direction: Longitudinal	Normalizing or normalizing + tempering	≥320	≥185	≥22	≥40	103~156	≥39
500＜d≤1000	Sample Direction: Longitudinal	Normalizing or normalizing + tempering	≥300	≥175	≥20	≥35	103~156	≥35

• The forgings must be inspected for mechanical properties after performance heat treatment and before any surface treatment.
• After the samples are removed, no heat treatments that affect the mechanical properties or any processing that influences the test results shall be conducted.
• Mechanical property testing primarily evaluates the material\'s tensile strength, impact resistance, and hardness. When conducting tensile, impact, and hardness tests simultaneously, the hardness value is for reference only. Alternatively, one may choose to perform only one of the tensile, impact, or hardness tests.

1 Approximate Comparison Table

China

Taiwan, China

Japan

South Korea

United States

Germany

France

Russia

Sweden

United Kingdom

ISC

CNS

JIS

ASTM/AISI

UNS

DIN EN/DIN

W-Nr.

NF EN/NF

GOST

BS EN/BS

U20202

S20C

SM20C

1020

G10200

C22E
Ck22

1.1151

C22E
XC18

1435

C22E
070M20

2 Approximate Comparison Table

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

China	European Standard
GB	EN	Numerical Grade
20	P235TR1	1.0254

4 Approximate Comparison Table

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

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

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

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	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

Note: The data is for reference only! If you have any questions, please fill out "I want to correct it"!