WHAT ARE STEEL GRADES?

Steel grades to classify various steels by their composition and physical properties have been developed by a number of standards organizations.

• SAE steel grades
• British Standards
• International Organization for Standardization ISO/TS 4949:2003
• For alloys in general (including steel), unified numbering system (UNS) of ASTM International and the Society of Automotive Engineers (SAE).
• Japanese steel grades
• Germany steel grades : DIN standard
• China steel grades : GB standard

Comparison

 Below is a table comparing steel grades from different grading systems.

Comparison of steel grades by chemistry

EN steel number	EN steel name	SAE grade	UNS	DIN	BS 970	UNI	JIS
Carbon steels
1.11411.0401 1.0453	C15DC18D	1018		CK15C15 C16.8	040A15080M15 080A15 EN3B	C15C16 1C15	S15S15CK S15C
1.05031.1191 1.1193 1.1194	C45	1045		C45CK45 CF45 CQ45	060A47080A46 080M46	C451C45 C46 C43	S45CS48C
1.07261.0727	35S2045S20	1140/1146		35S2045S20	212M40En8M
1.07151.0736	11SMn37	1215		9SMn289SMn36	230M07En1A	CF9SMn28CF9SMn36	SUM 25SUM 22
1.07181.0737	11SMnPb3011SMnPb37	12L14		9SMnPb289SMnPb36	230M07 LeadedEn1A Leaded	CF9SMnPb29CF9SMnPb36	SUM 22LSUM 23L SUM 24L
Alloy steels
1.7218		4130		25CrMo4GS-25CrMo4	708A30CDS110	25CrMo4 (KB)30CrMo4	SCM 420SCM 430 SCCrM1
1.72231.7225 1.7227 1.3563	42CrMo4	4140/4142		41CrMo442CrMo4 42CrMoS4 43CrMo4	708M40708A42 709M40 En19 En19C	41CrMo438CrMo4 (KB) G40 CrMo4 42CrMo4	SCM 440SCM 440H SNB 7 SCM 4M SCM 4
1.65821.6562	34CrNiMo6	4340		34CrNiMo640NiCrMo8-4	817M40En24	35NiCrMo6 (KB)40NiCrMo7 (KB)	SNCM 447SNB24-1-5
1.65431.6523	20NiCrMo2-2	8620		21NiCrMo2221NiCrMo2	805A20805M20	20NiCrMo2	SNCM 200 (H)
Stainless steels
1.4310	X10CrNi18-8	301	S30100
1.4318	X2CrNiN18-7	301LN
1.4305	X8CrNiS18-9	303	S30300	X10CrNiS18-9	202S 21En58M	X10CrNiS18-09	SUS 303
1.4301	X2CrNi19-11X2CrNi18-10	304	S30400	X5CrNi18-9X5CrNi18-10 XCrNi19-9	304S 15304S 16 304S 18 304S 25 En58E	X5CrNi18-10	SUS 304SUS 304-CSP
1.4306	X2CrNi19-11	304L	S30403		304S 11		SUS304L
1.4311	X2CrNiN18-10	304LN	S30453
1.4948	X6CrNi18-11	304H	S30409
1.4303	X5CrNi18-12	305	S30500
1.44011.4436	X5CrNiMo17-12-2X5CrNiMo18-14-3	316	S31600	X5CrNiMo17 12 2X5CrNiMo17 13 3 X5CrNiMo 19 11 X5CrNiMo 18 11	316S 29316S 31 316S 33 En58J	X5CrNiMo17 12X5CrNiMo17 13 X8CrNiMo17 13	SUS 316SUS316TP
1.4404	X2CrNiMo17-12-2	316L	S31603		316S 11		SUS316L
1.44061.4429	X2CrNiMoN17-12-2X2CrNiMoN17-13-3	316LN	S31653
1.4571		316Ti	S31635	X6CrNiMoTi17-12	320S 33
1.4438	X2CrNiMo18-15-4	317L	S31703
1.4541		321	S32100	X6CrNiTi18-10	321S 31		SUS321
1.4878	X12CrNiTi18-9	321H	S32109
1.4512	X6CrTi12	409	S40900
		410	S41000
1.4016		430	S43000	X6Cr17	430S 17		SUS430
		440A	S44002
1.4112		440B	S44003
1.4125		440C	S44004	X105CrMo17			SUS440C
1.4104		440F	S44020	X14CrMoS17			SUS430F
1.4539	X1NiCrMoCu25-20-5	904L	N08904
1.4547	X1CrNiMoCuN20-18-7		S31254
Tool steels
1.2363	X100CrMoV5	A-2	T30102	X100CrMoV51	BA 2	X100CrMoV5-1 KU	SKD 12
		A-3	T30103
		A-4	T30104
		A-6	T30106
		A-7	T30107
		A-8	T30108
		A-9	T30109
1.2379	X153CrMoV12	D-2		X153CrMoV12-1	BD 2	X155CrVMo12-1	SKD 11
1.2510		O-1		100MnCrW4	Bo 1	95MnWCr-5 KU

 

Source:From Wikipedia, the free encyclopedia