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Grade 1040
Corresponding Standard ASTM A866-2014
Medium Carbon Anti-Friction Bearing Steel
Classification Bearing Steel
1040 Chemical Element Composition Content (%)
Component C Si Mn P S Cu Al O
Minimum Value 0.37 0.15 0.6 - - - - -
Maximum Value 0.44 0.35 0.9 0.025 0.025 0.3 0.05 0.002
Note1: Elements not quoted shall not be intentionally added to the steel without the agreement of the purchaser
Note2: Intentional additions of calcium or calcium alloys for deoxidation or inclusion shape control are not permitted unless specifically approved by the purchaser
Note3: Oxygen content applies to product analysis and shall be determined in accordance with Test Methods E1019.
1 Approximate Comparison Table
China Taiwan, China Japan South Korea United States International Organization for Standardization Germany France Russia United Kingdom
GB ISC CNS JIS KS ASTM/AISI UNS ISO DIN EN/DIN W-Nr. NF EN/NF GOST BS EN/BS
40 U20402 S40C S40C SM40C 1040 G10400 C40E4 C40E
Ck40 		1.1186 C40E
XC42 		40 C40E
080M40
2 Approximate Comparison Table
United States International Organization for Standardization Germany France European Standard
ASTM ISO DIN EN/DIN NF EN/NF EN Numerical Grade
1040 C40R
C40M2 		Cm40 XC42H1u C40R 1.1189
3 Approximate Comparison Table Wrought aluminum and aluminum alloy
China Japan United States International Organization for Standardization European Standard
GB JIS ASTM UNS ISO Numerical Grade EN
1040 1040
A91040 		1040 A91040 Al99.4 A91040 EN-AW-Al99.4
4 Approximate Comparison Table
China Japan United States International Organization for Standardization Germany France European Standard Russia United Kingdom
GB JIS ASTM ISO DIN EN/DIN W-Nr. NF EN/NF EN Numerical Grade GOST BS EN/BS
40 S40C 1038
1040 		C40
C40E4 		C40
Ck40 		1.0511 AF60C40
AF60C45
XC42HI 		C40 1.0511 40 070M40
080M40
En8
5 Approximate Comparison Table
Japan United States International Organization for Standardization Germany France European Standard Russia United Kingdom
JIS ASTM ISO DIN EN/DIN NF EN/NF EN Numerical Grade GOST BS EN/BS
S40C 1040 C40E4 Ck40 XC42H1 C40E 1.1186 40 080M40
CS40
1040 Corresponding Standards(Same grade name, different standards)
1 SAE
1040 1040
2 ASTM A29/A29M-2012
1040 G10400
3 GB /T 3190-2008
1040
4 ASTM A29/A29M-2005
1040 G10400
5 ASTM A510/A510M-2013
1040 G10400 1040
6 SAE J403-2014
1040 G10400
7 ASTM A29/A29M-2020
1040 G10400
8 ASTM A866-2014
1040
9 GB /T 3190-2020
1040

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