30 - GB /T 17107-1997

Grade	30
Corresponding Standard	GB /T 17107-1997 Structural Steel Grades And Mechanical Property For Forgings
Classification	Carbon Steel

30 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu
Minimum Value	0.27	0.17	0.5	-	-	-	-	-
Maximum Value	0.35	0.37	0.8	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

30 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	≥470	≥245	≥19	≥48	126~179	≥31
100＜d≤300	Sample Direction: Longitudinal	Normalizing or normalizing + tempering	≥460	≥235	≥19	≥46	126~179	≥27
300＜d≤500	Sample Direction: Longitudinal	Normalizing or normalizing + tempering	≥450	≥225	≥18	≥40	126~179	≥27
500＜d≤800	Sample Direction: Longitudinal	Normalizing or normalizing + tempering	≥440	≥215	≥17	≥35	126~179	≥28

• 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 High-Quality Carbon Structural Steel

China

Taiwan, China

Japan

South Korea

United States

International Organization for Standardization

Germany

France

Russia

United Kingdom

ISC

CNS

JIS

ASTM/AISI

UNS

ISO

DIN EN/DIN

W-Nr.

NF EN/NF

GOST

BS EN/BS

U20302

S30C

SM30C

1030

G10300

C30E4

C30E
Ck30

1.1178

C30E
SC32

C30E
080M30

2 Approximate Comparison Table Carbon Structural Steel and Engineering Steel

China	Japan	International Organization for Standardization
GB	JIS	ISO
30	S30C	C30

3 Approximate Comparison Table Non-Alloy Steel for Quenching and Tempering

China	Japan	International Organization for Standardization
GB	JIS	ISO
30	S30C	C30E

4 Approximate Comparison Table High-Quality Carbon Structural Steel

China	Japan	United States	International Organization for Standardization	Germany		France	European Standard		Russia	United Kingdom
GB	JIS	SAE	ISO	DIN EN/DIN	W-Nr.	NF EN/NF	EN	Numerical Grade	GOST	BS EN/BS
30	S30C	1030	C30 C30E4	C30 Ck30	1.0528	AF50C30 XC32	C30	1.0528	30	080M32 En5

5 Approximate Comparison Table High-Quality Carbon Structural Steel

China	Japan	United States	International Organization for Standardization	France	Russia	United Kingdom
GB	JIS	ASTM/AISI	ISO	NF EN/NF	GOST	BS EN/BS
GB/T 699-1999 30	S30C	1030	ISO 630-1:1987 C30 C30E4 C30M2	C30 XC32	30	060A30

6 Approximate Comparison Table High-Quality Carbon Structural Steel

China	United Kingdom
GB	BS EN/BS
30	080A32

30 Corresponding Standards(Same grade name, different standards)

1	GB /T 699-1999
	30 U20302 30#
2	GB /T 699-2015
	30 U20302
3	GOST 1050-1988
	30
4	GB /T 17107-1997
	30
5	GB /T 3078-2019
	30 30#
6	GB /T 710-2008
	30 U20302 30#
7	GB /T 711-2017
	30 30#
8	HB /Z 136-2000
	30
9	GB /T 13237-2013
	30
10	GB 3522-1983
	30

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