TECHNICAL SPECIFICATIONS

TECHNICAL DATA

Find the right steel for your application

Select grades to compare

1. Chemical Composition (JIS / SAE)

Chemical composition ranges for common grades under JIS G 4053, JIS G 4051 and SAE/AISI standards. Use for cross-standard material selection and grade comparison. Click a highlighted grade name to view full supply specs and heat treatment details.

Grade	C	Si	Mn	P Max	S Max	Ni	Cr	Mo	Other
SWRCH8R	0.10 max	-	0.60 max	0.040	0.040	-	-	-	-
SWRCH10R	0.08-0.13	-	0.30-0.60	0.040	0.040	-	-	-	-
SWRCH8A	0.10 max	0.10 max	0.60 max	0.030	0.035	-	-	-	Al: 0.02 min
SWRCH10A	0.08-0.13	0.10 max	0.30-0.60	0.030	0.035	-	-	-	Al: 0.02 min
SWRCH15A	0.13-0.18	0.10 max	0.30-0.60	0.030	0.035	-	-	-	Al: 0.02 min
SWRCH22A	0.18-0.23	0.10 max	0.30-0.60	0.030	0.035	-	-	-	Al: 0.02 min

Grade	C	Si	Mn	P Max	S Max	Ni	Cr	Mo	Other
S15C	0.13-0.18	0.15-0.35	0.30-0.60	0.030	0.035	-	-	-	-
S35C	0.32-0.38	0.15-0.35	0.60-0.90	0.030	0.035	-	-	-	-
S45C	0.42-0.48	0.15-0.35	0.60-0.90	0.030	0.035	-	-	-	-
S50C	0.47-0.53	0.15-0.35	0.60-0.90	0.030	0.035	-	-	-	-
S55C	0.52-0.58	0.15-0.35	0.60-0.90	0.030	0.035	-	-	-	-
SAE 1008	0.10 max	-	0.30-0.50	0.030	0.050	-	-	-	-
SAE 1010	0.08-0.13	-	0.30-0.60	0.030	0.050	-	-	-	-
SAE 1015	0.13-0.18	-	0.30-0.60	0.030	0.050	-	-	-	-
SAE 1018	0.15-0.20	-	0.60-0.90	0.040	0.050	-	-	-	-
SAE 1021	0.18-0.23	-	0.60-0.90	0.030	0.050	-	-	-	-
SAE 1045	0.43-0.50	-	0.60-0.90	0.030	0.050	-	-	-	-

Grade	C	Si	Mn	P Max	S Max	Ni	Cr	Mo	Other
SUM23	0.09 max	-	0.75-1.05	0.04-0.09	0.26-0.35	-	-	-	-
SUM24L	0.15 max	-	0.85-1.15	0.04-0.09	0.26-0.35	-	-	-	Pb: 0.10-0.35
SAE 12L14	0.15 max	-	0.85-1.15	0.04-0.09	0.26-0.35	-	-	-	Pb: 0.15-0.35
SAE 1215	0.09 max	-	0.75-1.05	0.04-0.09	0.26-0.35	-	-	-	-

Grade	C	Si	Mn	P Max	S Max	Ni	Cr	Mo	Other
SMn420	0.17-0.23	0.15-0.35	1.20-1.50	0.030	0.030	-	-	-	-
SMn433	0.30-0.36	0.15-0.35	1.20-1.50	0.030	0.030	-	-	-	-
SMn438	0.35-0.41	0.15-0.35	1.35-1.65	0.030	0.030	-	-	-	-
SMn443	0.40-0.46	0.15-0.35	1.35-1.65	0.030	0.030	-	-	-	-
SMnC420	0.17-0.23	0.15-0.35	1.20-1.50	0.030	0.030	-	0.35-0.70	-	-
SMnC443	0.40-0.46	0.15-0.35	1.35-1.65	0.030	0.030	-	0.35-0.70	-	-
SCr415	0.13-0.18	0.15-0.35	0.60-0.90	0.030	0.030	-	0.90-1.20	-	-
SCr420	0.18-0.23	0.15-0.35	0.60-0.90	0.030	0.030	-	0.90-1.20	-	-
SCr430	0.28-0.33	0.15-0.35	0.60-0.90	0.030	0.030	-	0.90-1.20	-	-
SCr435	0.33-0.38	0.15-0.35	0.60-0.90	0.030	0.030	-	0.90-1.20	-	-
SCr440	0.38-0.43	0.15-0.35	0.60-0.90	0.030	0.030	-	0.90-1.20	-	-
SCr445	0.43-0.48	0.15-0.35	0.60-0.90	0.030	0.030	-	0.90-1.20	-	-
SCM415	0.13-0.18	0.15-0.35	0.60-0.90	0.030	0.030	-	0.90-1.20	0.15-0.25	-
SCM418	0.16-0.21	0.15-0.35	0.60-0.90	0.030	0.030	-	0.90-1.20	0.15-0.25	-
SCM420	0.18-0.23	0.15-0.35	0.60-0.90	0.030	0.030	-	0.90-1.20	0.15-0.25	-
SCM421	0.17-0.23	0.15-0.35	0.70-1.00	0.030	0.030	-	0.90-1.20	0.15-0.25	-
SCM425	0.23-0.28	0.15-0.35	0.60-0.90	0.030	0.030	-	0.90-1.20	0.15-0.30	-
SCM430	0.28-0.33	0.15-0.35	0.60-0.90	0.030	0.030	-	0.90-1.20	0.15-0.30	-
SCM432	0.27-0.37	0.15-0.35	0.30-0.60	0.030	0.030	-	1.00-1.50	0.15-0.30	-
SCM435	0.33-0.38	0.15-0.35	0.60-0.90	0.030	0.030	-	0.90-1.20	0.15-0.30	-
SCM440	0.38-0.43	0.15-0.35	0.60-0.90	0.030	0.030	-	0.90-1.20	0.15-0.30	-
SCM445	0.43-0.48	0.15-0.35	0.60-0.90	0.030	0.030	-	0.90-1.20	0.15-0.30	-
SCM822	0.20-0.25	0.15-0.35	0.60-0.90	0.030	0.030	-	0.90-1.20	0.35-0.45	-

Grade	C	Si	Mn	P Max	S Max	Ni	Cr	Mo	Other
SNC236	0.32-0.40	0.15-0.35	0.50-0.80	0.030	0.030	1.00-1.50	0.50-0.90	-	-
SNC415	0.12-0.18	0.15-0.35	0.35-0.65	0.030	0.030	2.00-2.50	0.20-0.50	-	-
SNC631	0.27-0.35	0.15-0.35	0.35-0.65	0.030	0.030	2.50-3.00	0.60-1.00	-	-
SNC815	0.12-0.18	0.15-0.35	0.35-0.65	0.030	0.030	3.00-3.50	0.60-1.00	-	-
SNC836	0.32-0.40	0.15-0.35	0.35-0.65	0.030	0.030	3.00-3.50	0.60-1.00	-	-
SNCM220	0.17-0.23	0.15-0.35	0.60-0.90	0.030	0.030	0.40-0.70	0.40-0.60	0.15-0.25	-
SNCM240	0.38-0.43	0.15-0.35	0.70-1.00	0.030	0.030	0.40-0.70	0.40-0.60	0.15-0.30	-
SNCM415	0.12-0.18	0.15-0.35	0.40-0.70	0.030	0.030	1.60-2.00	0.40-0.60	0.15-0.30	-
SNCM420	0.17-0.23	0.15-0.35	0.40-0.70	0.030	0.030	1.60-2.00	0.40-0.60	0.15-0.30	-
SNCM431	0.27-0.35	0.15-0.35	0.60-0.90	0.030	0.030	1.60-2.00	0.60-1.00	0.15-0.30	-
SNCM439	0.36-0.43	0.15-0.35	0.60-0.90	0.030	0.030	1.60-2.00	0.60-1.00	0.15-0.30	-
SNCM447	0.44-0.50	0.15-0.35	0.60-0.90	0.030	0.030	1.60-2.00	0.60-1.00	0.15-0.30	-
SNCM616	0.13-0.20	0.15-0.35	0.80-1.20	0.030	0.030	2.80-3.20	1.40-1.80	0.40-0.60	-
SNCM625	0.20-0.30	0.15-0.35	0.35-0.60	0.030	0.030	3.00-3.50	1.00-1.50	0.15-0.30	-
SNCM630	0.25-0.35	0.15-0.35	0.35-0.60	0.030	0.030	2.50-3.50	2.50-3.50	0.30-0.70	-
SNCM815	0.12-0.18	0.15-0.35	0.30-0.60	0.030	0.030	4.00-4.50	0.70-1.00	0.15-0.30	-
SACM645	0.40-0.50	0.15-0.50	0.60 max	0.030	0.030	0.25 max	1.30-1.70	0.15-0.30	Al: 0.70-1.20

Grade	C	Si	Mn	P Max	S Max	Ni	Cr	Mo	Other
SAE 8620	0.18-0.23	0.15-0.35	0.70-0.90	0.030	0.040	0.40-0.70	0.40-0.60	0.15-0.25	-
SAE 8622	0.20-0.25	0.15-0.35	0.70-0.90	0.030	0.040	0.40-0.70	0.40-0.60	0.15-0.25	-
SAE 8625	0.23-0.28	0.15-0.35	0.70-0.90	0.030	0.040	0.40-0.70	0.40-0.60	0.15-0.25	-
SAE 8630	0.28-0.33	0.15-0.35	0.70-0.90	0.030	0.040	0.40-0.70	0.40-0.60	0.15-0.25	-
SAE 8640	0.38-0.43	0.15-0.35	0.75-1.00	0.030	0.040	0.40-0.70	0.40-0.60	0.15-0.25	-
SAE 8645	0.43-0.48	0.15-0.35	0.75-1.00	0.030	0.040	0.40-0.70	0.40-0.60	0.15-0.25	-
SAE 8660	0.56-0.64	0.15-0.35	0.75-1.00	0.030	0.040	0.40-0.70	0.40-0.60	0.15-0.25	-
SAE 8720	0.18-0.23	0.15-0.35	0.70-0.90	0.030	0.040	0.40-0.70	0.40-0.60	0.20-0.30	-
SAE 8822	0.20-0.25	0.15-0.35	0.75-1.00	0.030	0.040	0.40-0.70	0.40-0.60	0.30-0.40	-
SAE 9259	0.56-0.64	0.70-1.10	0.75-1.00	0.030	0.040	-	0.45-0.65	-	-
SAE 9260	0.56-0.64	1.80-2.20	0.75-1.00	0.030	0.040	-	-	-	-

Grade	C	Si	Mn	P Max	S Max	Ni	Cr	Mo	Other
SAE 6135	0.32-0.38	0.15-0.30	0.50-0.90	0.035	0.040	0.25 max	0.50-0.90	-	Cu: 0.35 max, V: 0.10-0.20
SAE 6140	0.38-0.43	0.15-0.30	0.50-0.90	0.035	0.040	0.25 max	0.50-0.90	-	Cu: 0.35 max, V: 0.10-0.20
SAE 6150	0.48-0.53	0.15-0.35	0.70-0.90	0.035	0.040	0.25 max	0.80-1.10	-	Cu: 0.35 max, V: 0.15 min

Grade	C	Si	Mn	P Max	S Max	Ni	Cr	Mo	Other
10B20	0.18-0.23	0.10 max	0.30-0.60	0.025	0.025	-	-	-	B: 0.0005 min
10B21	0.18-0.23	0.10 max	0.70-1.00	0.025	0.025	-	-	-	B: 0.0005 min
10B22	0.18-0.23	0.10 max	0.70-1.00	0.025	0.025	-	-	-	B: 0.0005 min
10B29	0.26-0.30	0.10 max	0.70-1.00	0.025	0.025	-	-	-	B: 0.0005 min
10B33	0.32-0.36	0.15-0.35	0.70-1.00	0.025	0.025	-	-	-	B: 0.0005 min
10B38	0.35-0.42	0.15-0.35	0.70-1.00	0.025	0.025	-	-	-	B: 0.0005 min
50BV30	0.27-0.33	0.10 max	0.70-1.00	0.030	0.030	-	0.30-0.50	-	V: 0.10-0.15, B: 0.0005 min

Grade	C	Si	Mn	P Max	S Max	Ni	Cr	Mo	Other
SS330	-	-	-	0.050	0.050	-	-	-	-
SS400	-	-	-	0.050	0.050	-	-	-	-
SS490	-	-	-	0.050	0.050	-	-	-	-
SS540	0.30 max	-	1.60 max	0.040	0.040	-	-	-	-
A572 Gr.42	0.21 max	0.15-0.40	1.35 max	0.030	0.030	-	-	-	-
A572 Gr.50	0.23 max	0.15-0.40	1.35 max	0.030	0.030	-	-	-	-
A709 Gr.50	0.23 max	0.15-0.40	1.35 max	0.030	0.030	-	-	-	-
S355JR	0.24 max	0.55 max	1.60 max	0.035	0.035	-	-	-	Cu: 0.55 max
S355J2	0.20 max	0.55 max	1.60 max	0.025	0.025	-	-	-	Cu: 0.55 max

Grade	C	Si	Mn	P Max	S Max	Ni	Cr	Mo	Other
SUP 6	0.56-0.64	1.50-1.80	0.70-1.00	0.030	0.030	-	-	-	-
SUP 7	0.56-0.64	1.80-2.20	0.70-1.00	0.030	0.030	-	-	-	-
SUP 9	0.52-0.60	0.15-0.35	0.65-0.95	0.030	0.030	-	0.65-0.95	-	-
SUP 9A	0.56-0.64	0.15-0.35	0.70-1.00	0.030	0.030	-	0.70-1.00	-	-
SUP 10	0.47-0.55	0.15-0.35	0.65-0.95	0.030	0.030	-	0.80-1.10	-	V: 0.15-0.25
SUP 11A	0.56-0.64	0.15-0.35	0.70-1.00	0.030	0.030	-	0.70-1.00	-	B: 0.0005-0.0050
SUP 12	0.51-0.59	1.20-1.60	0.60-0.90	0.030	0.030	-	0.60-0.90	-	-
SUP 13	0.56-0.64	0.15-0.35	0.70-1.00	0.030	0.030	-	0.70-0.90	0.25-0.35	-

Compare	Grade	C	Si	Mn	P Max	S Max	Ni	Cr	Mo	Other
	SUJ 2	0.95-1.10	0.15-0.35	0.50 max	0.025	0.025	-	1.30-1.60	0.08 max	-

2. Mechanical Properties (General Structural)

Typical mechanical properties after standard heat treatment (quench & temper or carburizing). Actual values vary with section size and process conditions — use as initial selection reference only.

Grade	Yield Strength (MPa)	Tensile Strength (MPa)	Yield Ratio	Elongation %
SS330	205 min	330-430	-	21 min
SS400	245 min	400-510	-	17 min
SS540	400 min	540 min	-	13 min
SM400A	245 min	400-510	-	18 min
SM490A	325 min	490-610	-	17 min
SN400B	235-355	400-510	80% max	18 min
SN490B	325-445	490-610	80% max	17 min
A36	250 min (36 ksi)	400-550 (58-80 ksi)	-	20 min
A572 Gr.42	290 min (42 ksi)	415 min (60 ksi)	-	20 min
A572 Gr.50 / A709 Gr.50	345 min (50 ksi)	450 min (65 ksi)	-	18 min

3. Diameter Tolerance

Dimensional tolerances for round bars per CNS 8279 / JIS G3191. Use to confirm procurement specs for black (hot-rolled) and turned (peeled/ground) bar stock.

Diameter (mm)	Tolerance	Roundness
D < 16	± 0.40 mm	0.56 mm max
16 ≤ D < 28	± 0.50 mm	0.70 mm max
28 ≤ D	± 1.8% * D	2.52% * D max

Diameter (mm)	Tolerance	Roundness
D ≤ 26	± 0.40 mm	0.56 mm max
26 < D	± 1.5% * D	2.1% * D max

Diameter (mm)	Tolerance	Roundness
D ≤ 15	± 0.30 mm	0.40 mm max
15 < D ≤ 25	± 0.40 mm	0.50 mm max
32 < D ≤ 50	± 0.60 mm	0.70 mm max

Diameter (mm)	Tolerance	Roundness
D ≤ 7	± 0.13 mm	0.20 mm max
7 < D ≤ 11	± 0.15 mm	0.22 mm max
11 < D ≤ 15	± 0.18 mm	0.27 mm max
15 < D ≤ 19	± 0.20 mm	0.30 mm max
19 < D ≤ 250	± 1.0% * D	1.5% * D max

Diameter (mm)	Tolerance	Roundness
10 ≤ D < 16	± 0.25 mm	0.25 mm max
16 ≤ D < 21	± 0.30 mm	0.30 mm max
21 ≤ D < 34	± 0.40 mm	0.40 mm max
34 ≤ D < 46	± 0.50 mm	0.50 mm max
46 ≤ D < 75	± 0.70 mm	0.70 mm max
75 ≤ D ≤ 80	± 1.00 mm	1.00 mm max

4. Length Tolerance

Standard length tolerances per JIS G3191/G4051/G4053/G4801 and CNS 8279. Applicable to cut-to-length orders; consult us for tight-tolerance or fixed-length requirements.

Length	Tolerance
L ≤ 7000	+40, 0
L > 7000	Add 5mm to max tolerance for every 1m increase

5. Straightness Tolerance

Straightness tolerances for round bar stock. Critical for CNC machining and precision grinding applications where bar bow affects workholding and finish quality.

Tolerance	Remarks
6mm / 1.5m (0.40% x L)	Normal Straightness
3mm / 1.5m (0.20% x L)	Special Straightness

Tolerance	Remarks
3mm / 1m (3mm/1m x L)	-