50SICRMO6

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50SiCrMo6 · DIN EN 10089-2003

Chemical composition source verified; this does not verify every standard clause, actual supply or measured heat results

Material form: Reference record
Original record status: Original standard verified
Standard edition: DIN EN 10089-2003
Table / clause: Table 3 and notes a/b and 7.1; Only the first 17 pages of the original text are available
PDF page references: 1、7、9、12、13

Carbon-equivalent reference

IIW / CEV：0.7767–1.0367Known-element contribution; incomplete value; missing V, Ni; coupled-element constraints require separate checks; the entire envelope is not guaranteed to be realizable CEV = C + Mn/6 + (Cr + Mo + V)/5 + (Ni + Cu)/15; an engineering estimate of welding cold-cracking susceptibility for carbon and low-alloy steels.

Pcm（Ito–Bessyo）：0.5950–0.7583Known-element contribution; incomplete value; missing Ni, V, B; coupled-element constraints require separate checks; the entire envelope is not guaranteed to be realizable Pcm = C + Si/30 + (Mn + Cu + Cr)/20 + Ni/60 + Mo/15 + V/10 + 5B; mainly used for low-carbon low-alloy steels, particularly modern low-carbon pipeline steels; more relevant when C is approximately no higher than 0.11%.

CET：0.5900–0.7600Known-element contribution; incomplete value; missing Ni; coupled-element constraints require separate checks; the entire envelope is not guaranteed to be realizable CET = C + (Mn + Mo)/10 + (Cr + Cu)/20 + Ni/40; used in welding preheat assessment for ferritic steels, subject to the applicability conditions of EN 1011-2.

Composition

Element	Composition requirement
C	0.46 ～ 0.54
Si	1.4 ～ 1.8
Mn	0.7 ～ 1.0
Cr	0.8 ～ 1.1
Mo	0.2 ～ 0.35
P	≤ 0.025 (lower limit not stated)
S	≤ 0.025 (lower limit not stated)
Cu	≤ 0.6 (lower limit not stated)
Sn	≤ 0.06 (lower limit not stated)

Applicability and limitations

DIN EN10089:2003-04 official English original, adopting standard EN10089:2002; Table 3 heat analysis wt%. ; Cu+10Sn≤.60%; Cu≤.60/Sn≤.06 are only single-item envelopes derived from the linkage formula under the condition that each element is non-negative; they are not independent limits from the original table and the linkage formula must be satisfied simultaneously. ; Table 3 Note a: unspecified elements shall not be intentionally added without the purchaser's consent (except additions needed to finish steelmaking); blanks shall not be filled as zero. ; Note b: when hardenability is specified, C may deviate slightly but not exceed ±.01, others shall comply with Table 4 except for P/S; Default composition has not been automatically relaxed. ; This document contains only the first 17 pages; Table 3 is complete and verifiable; Hardenability Tables 7/8 and other missing pages need to be supplemented separately; the completeness of the entire standard is not claimed. ; Hot-rolled spring steels intended for quenching and tempering; composition or annealed condition alone does not establish cold-heading suitability or actual supply..

Combined limits

Combined-element limits

Element coefficient
Cu
1
Sn
10
Upper limit
0.6
Requirement
Cu + 10Sn ≤ 0.60 wt%

Verification notes

Official original Table 3: all 19 rows and footnotes visually checked.

Jominy end-quench hardenability (conditional requirements)

EN 10089:2002 · BS EN 10089:2002 · Tables 7/8, 7.1.2–7.1.4 and Table 10 · PDF pages 6, 9, 17, 18, 20, 21

Footnote a of Table 7/Table 8 refers to Figure 1; The scatter bands for +H and +HH shall be maintained separately; lower limits shall not be interchanged.
Applicable only to conditions where the corresponding +H or +HH hardenability symbols are actually used for ordering; Specific delivery condition and dimension range shall still be confirmed according to the order and Table 1 of the standard.
When ordering based on core hardness requirements per 7.1.3, the end-quench data in Table 7/Table 8 are for reference only and cannot serve as an acceptance guarantee for the same order item.
HRC is the hardness at the specified distance of the end-quench test specimen, not the overall hardness of the finished product, nor does it prove cold-heading suitability or part performance.
A horizontal line in the original table indicates that the lower limit for that distance is not specified and shall remain blank; Shall not be treated as 0; no interpolation, extrapolation, or conformity determination shall be performed for distances not listed.
The shown quenching temperature is the standard end-quench test condition and cannot be used as a production heat treatment process parameter or recommendation.
Testing shall be according to EN ISO642 as cited in Table 10 (source standard specifies ISO642:1999); Test units shall be divided by heat, with 1 sample per unit and 1 test per sample; sampling for disputes shall otherwise follow Table 10.
This record is for DIN EN10089:2003-04 adopting EN10089:2002; Hardenability data is explicitly read from the original table of BS EN10089:2002; it is not claimed that missing pages of the DIN original document have been verified or completed.

+H normal hardenability band (7.1.2)

End-quench test temperature 890 ± 5 °C; This is not a production heat-treatment recommendation.

Distance from quenched end (mm)	Lower limit (HRC)	Upper limit (HRC)
1.5	57	65
3	56	65
5	56	64
7	55	64
9	55	64
11	54	64
13	54	63
15	53	63
20	52	63
25	51	62
30	49	61
35	47	61
40	45	60
45	44	60
50	43	59

+HH restricted hardenability band (7.1.4)

End-quench test temperature 890 ± 5 °C; This is not a production heat-treatment recommendation.

Distance from quenched end (mm)	Lower limit (HRC)	Upper limit (HRC)
1.5	60	65
3	59	65
5	59	64
7	58	64
9	58	64
11	57	64
13	57	63
15	56	63
20	56	63
25	55	62
30	53	61
35	52	61
40	50	60
45	49	60
50	48	59

Distance from quenched end (mm)	Lower limit (HRC)	Upper limit (HRC)
1.5	57	65
3	56	65
5	56	64
7	55	64
9	55	64
11	54	64
13	54	63
15	53	63
20	52	63
25	51	62
30	49	61
35	47	61
40	45	60
45	44	60
50	43	59

Distance from quenched end (mm)	Lower limit (HRC)	Upper limit (HRC)
1.5	60	65
3	59	65
5	59	64
7	58	64
9	58	64
11	57	64
13	57	63
15	56	63
20	56	63
25	55	62
30	53	61
35	52	61
40	50	60
45	49	60
50	48	59

Distance from quenched end (mm)	Lower limit (HRC)	Upper limit (HRC)
1.5	57	65
3	56	65
5	56	64
7	55	64
9	55	64
11	54	64
13	54	63
15	53	63
20	52	63
25	51	62
30	49	61
35	47	61
40	45	60
45	44	60
50	43	59

Distance from quenched end (mm)	Lower limit (HRC)	Upper limit (HRC)
1.5	60	65
3	59	65
5	59	64
7	58	64
9	58	64
11	57	64
13	57	63
15	56	63
20	56	63
25	55	62
30	53	61
35	52	61
40	50	60
45	49	60
50	48	59

Distance from quenched end (mm)	Lower limit (HRC)	Upper limit (HRC)
1.5	57	65
3	56	65
5	56	64
7	55	64
9	55	64
11	54	64
13	54	63
15	53	63
20	52	63
25	51	62
30	49	61
35	47	61
40	45	60
45	44	60
50	43	59

Distance from quenched end (mm)	Lower limit (HRC)	Upper limit (HRC)
1.5	60	65
3	59	65
5	59	64
7	58	64
9	58	64
11	57	64
13	57	63
15	56	63
20	56	63
25	55	62
30	53	61
35	52	61
40	50	60
45	49	60
50	48	59