SCr445 Cold heading steel wire

1. Chemical composition

Table 2-Chemical ingredients, units %

Steel grade	C	Si	Mn	P	S	Ni	Cr	Mo	Cu
SMn420	0.17 ~ 0.23	0.15 ~ 0.35	1.20 ~ 1.50	≤0.030	≤0.030	≤0.25	≤0.35	–	＜0.30
SMn433	0.30 ~ 0.36	0.15 ~ 0.35	1.20 ~ 1.50	≤0.030	≤0.030	≤0.25	≤0.35	–	＜0.30
SMn438	0.35 ~ 0.41	0.15 ~ 0.35	1.35 ~ 1.65	≤0.030	≤0.030	≤0.25	≤0.35	–	＜0.30
SMn443	0.40 ~ 0.46	0.15 ~ 0.35	1.35 ~ 1.65	≤0.030	≤0.030	≤0.25	≤0.35	–	＜0.30
SMnC420	0.17 ~ 0.23	0.15 ~ 0.35	1.20 ~ 1.50	≤0.030	≤0.030	≤0.25	0.35 ~ 0.70	–	＜0.30
SMnC443	0.40 ~ 0.46	0.15 ~ 0.35	1.35 ~ 1.65	≤0.030	≤0.030	≤0.25	0.35 ~ 0.70	–	＜0.30
SCr415	0.13 ~ 0.18	0.15 ~ 0.35	0.60 ~ 0.90	≤0.030	≤0.030	≤0.25	0.90 ~ 1.20	–	＜0.30
SCr420	0.18 ~ 0.23	0.15 ~ 0.35	0.60 ~ 0.90	≤0.030	≤0.030	≤0.25	0.90 ~ 1.20	–	＜0.30
SCr430	0.28 ~ 0.33	0.15 ~ 0.35	0.60 ~ 0.90	≤0.030	≤0.030	≤0.25	0.90 ~ 1.20	–	＜0.30
SCr435	0.33 ~ 0.38	0.15 ~ 0.35	0.60 ~ 0.90	≤0.030	≤0.030	≤0.25	0.90 ~ 1.20	–	＜0.30
SCr440	0.38 ~ 0.43	0.15 ~ 0.35	0.60 ~ 0.90	≤0.030	≤0.030	≤0.25	0.90 ~ 1.20	–	＜0.30
SCr445	0.43 ~ 0.48	0.15 ~ 0.35	0.60 ~ 0.90	≤0.030	≤0.030	≤0.25	0.90 ~ 1.20	–	＜0.30
SCM415	0.13 ~ 0.18	0.15 ~ 0.35	0.60 ~ 0.90	≤0.030	≤0.030	≤0.25	0.90 ~ 1.20	0.15 ~ 0.25	＜0.30
SCM418	0.16 ~ 0.21	0.15 ~ 0.35	0.60 ~ 0.90	≤0.030	≤0.030	≤0.25	0.90 ~ 1.20	0.15 ~ 0.25	＜0.30

Steel grade	C	Si	Mn	P	S	Ni	Cr	Mo	Cu
SCM420	0.18 ~ 0.23	0.15 ~ 0.35	0.60 ~ 0.90	≤0.030	≤0.030	≤0.25	0.90 ~ 1.20	0.15 ~ 0.25	＜0.30
SCM421	0.17 ~ 0.23	0.15 ~ 0.35	0.70 ~ 1.00	≤0.030	≤0.030	≤0.25	0.90 ~ 1.20	0.15 ~ 0.25	＜0.30
SCM425	0.23 ~ 0.28	0.15 ~ 0.35	0.60 ~ 0.90	≤0.030	≤0.030	≤0.25	0.90 ~ 1.20	0.15 ~ 0.30	＜0.30
SCM430	0.28 ~ 0.33	0.15 ~ 0.35	0.60 ~ 0.90	≤0.030	≤0.030	≤0.25	0.90 ~ 1.20	0.15 ~ 0.30	＜0.30
SCM432	0.27 ~ 0.37	0.15 ~ 0.35	0.30 ~ 0.60	≤0.030	≤0.030	≤0.25	1.00 ~ 1.50	0.15 ~ 0.30	＜0.30
SCM435	0.33 ~ 0.38	0.15 ~ 0.35	0.60 ~ 0.90	≤0.030	≤0.030	≤0.25	0.90 ~ 1.20	0.15 ~ 0.30	＜0.30
SCM440	0.38 ~ 0.43	0.15 ~ 0.35	0.60 ~ 0.90	≤0.030	≤0.030	≤0.25	0.90 ~ 1.20	0.15 ~ 0.30	＜0.30
SCM445	0.43 ~ 0.48	0.15 ~ 0.35	0.60 ~ 0.90	≤0.030	≤0.030	≤0.25	0.90 ~ 1.20	0.15 ~ 0.30	＜0.30
SCM822	0.20 ~ 0.25	0.15 ~ 0.35	0.60 ~ 0.90	≤0.030	≤0.030	≤0.25	0.90 ~ 1.20	0.35 ~ 0.45	＜0.30
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	–	＜0.30
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	–	＜0.30
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	–	＜0.30
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	–	＜0.30
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	–	＜0.30
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	＜0.30
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	＜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	＜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	＜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	＜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	≤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	≤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	≤0.30
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	≤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	0.50 ~ 0.70	≤0.30
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	≤0.30
SACM645	0.40 ~ 0.50	0.15 ~ 0.50	0.60 or less	≤0.030	≤0.030	≤0.25	1.30 ~ 1.70	0.15 ~ 0.30	≤0.30

Elements not specified in this table should not be intentionally added except for the purpose of finishing the molten steel.
Note a) Do not intentionally add.
b) Mo of SNCM630 may have a lower limit of 0.30%, depending on the agreement between the receiving parties.
c) The Al of SACM645 is 0.70% to 1.20%.

3. Dimensions tolerance

Table 8-Dimensions tolerance of hot rolled wire

Diameter	Diameter tolerance	Out-of-roundness
<15	±0.3	<0.4
15<d≤25	±0.4	<0.5
25<d≤32	±0.5	<0.6
32<d≤50	±0.6	<0.7

The tolerance of the dimensions of the wire with a diameter of more than 50 mm depends on the agreement between the receiving parties.
Note a) The deviation is the difference between the maximum value and the minimum value of the diameter in the same cross-section of the wire.