55SICR6-3
1 source records. Standards, editions and conditions are presented separately; matching grade names do not establish interchangeability.
Refer to each source for mass fractions and analysis type. Missing values are not treated as 0. Manufacturer typical values, standard guarantees and measured heat results must remain separate. Use the material selector for calculations and condition selection.
Open condition selection, comparison and carbon-equivalent tools for 55SICR6-3 →55SiCr6-3 · ISO 683-6:2023 (original BS ISO national adoption)
Chemical composition source verified; this does not verify every standard clause, actual supply or measured heat results
- Material category
- Spring steels
- Subcategory
- Spring steels
- Material form
- Round bars, flat bars and wire rod
- Original record status
- Original standard verified
- Standard edition
- ISO 683-6:2023 / BS ISO 683-6:2023
- Table / clause
- Table 4, footnotes a–c; Table 5; 7.2
- PDF page references
- 20、21
- Unit
- Mass fraction (wt%)
- Analysis type
- Heat analysis
Carbon-equivalent reference
Estimates are presented separately for each applicable composition condition. Match the actual ordering conditions; ranges must not be combined.
Ordinary heat analysis: Table 4 (without +H/+HH)
IIW / CEV：0.6933–0.8833Known-element contribution; incomplete value; missing Mo, V, Ni, Cu; 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）：0.6000–0.7233Known-element contribution; incomplete value; missing Cu, Ni, Mo, 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：0.5850–0.7100Known-element contribution; incomplete value; missing Mo, Cu, 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.
+H heat analysis: Table 4, note b and Table 5 (C±0.01; P/S is not widened)
IIW / CEV：0.6667–0.9100Known-element contribution; incomplete value; missing Mo, V, Ni, Cu; 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）：0.5838–0.7395Known-element contribution; incomplete value; missing Cu, Ni, Mo, 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：0.5685–0.7265Known-element contribution; incomplete value; missing Mo, Cu, 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.
+HH heat analysis: Table 4, note b and Table 5 (C±0.01; P/S is not widened)
IIW / CEV：0.6667–0.9100Known-element contribution; incomplete value; missing Mo, V, Ni, Cu; 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）：0.5838–0.7395Known-element contribution; incomplete value; missing Cu, Ni, Mo, 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：0.5685–0.7265Known-element contribution; incomplete value; missing Mo, Cu, 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 record (conditional branches apply; this is not an unconditional requirement)
| Element | Composition requirement |
|---|---|
| C | 0.51 ～ 0.59 |
| Si | 1.2 ～ 1.6 |
| Mn | 0.5 ～ 0.8 |
| P | ≤ 0.025 (lower limit not stated) |
| S | ≤ 0.025 (lower limit not stated) |
| Cr | 0.5 ～ 0.8 |
Applicability and limitations
Original BS ISO 683-6:2023 document; ISO fourth edition, 2023-11.; Table 4 PDF page 20/printed page 12, Table 5 PDF page 21/printed page 13. Heat analysis wt%, must select ordinary or +H/+HH conditions; Cu+10Sn≤0.60%. Do not substitute 0 for unlisted elements. Product analysis and mechanical-property conditions require separate verification; this is not a supply guarantee from the company..
Composition conditions
- Table 4 is heat analysis, mass fraction %; Dashes or unspecified elements must not be assumed to have a value of 0..
- Original image last column header Cu+Sn, cell explicitly Cu+10Sn≤0.60%; Retain as weighted formula per main text, do not split into independent limits.
- Table 4 Note b: +H/+HH follow the permitted deviations in Table 5, with C specifically not exceeding ±0.01%; P/S not relaxed; Unselected conditions shall not be calculated by default.
- Product analysis shall be verified separately per Table 5; its C/P/S deviations shall not be directly applied to the current heat analysis branch; For the same heat, the same element shall not simultaneously exhibit deviations exceeding the upper limit and falling below the lower limit.
- Note c allows lower P/S upper limits by agreement; values shall not be automatically changed if no agreement is provided; Intentional addition of elements not listed requires agreement (except additions needed to finish steelmaking).
- For springs intended for quenching and tempering.; Heat treatment, hardness, hardenability, dimensions and surface conditions require verification under the main text; do not collapse mechanical properties across conditions in this batch..
Combined limits
- Combined-element limits
- Requirement
- Cu + 10×Sn
- Element coefficient
- Cu
- 1
- Sn
- 10
- Upper limit
- 0.6
- Elements requiring measured values from the same heat
- Cu
- Sn
Original condition-branch records
Ordinary heat analysis: Table 4 (without +H/+HH)
| Element | Composition requirement |
|---|---|
| C | 0.51 ～ 0.59 |
| Si | 1.2 ～ 1.6 |
| Mn | 0.5 ～ 0.8 |
| P | ≤ 0.025 (lower limit not stated) |
| S | ≤ 0.025 (lower limit not stated) |
| Cr | 0.5 ～ 0.8 |
+H heat analysis: Table 4, note b and Table 5 (C±0.01; P/S is not widened)
| Element | Composition requirement |
|---|---|
| C | 0.5 ～ 0.6 |
| Si | 1.15 ～ 1.65 |
| Mn | 0.46 ～ 0.84 |
| P | ≤ 0.025 (lower limit not stated) |
| S | ≤ 0.025 (lower limit not stated) |
| Cr | 0.45 ～ 0.85 |
+HH heat analysis: Table 4, note b and Table 5 (C±0.01; P/S is not widened)
| Element | Composition requirement |
|---|---|
| C | 0.5 ～ 0.6 |
| Si | 1.15 ～ 1.65 |
| Mn | 0.46 ～ 0.84 |
| P | ≤ 0.025 (lower limit not stated) |
| S | ≤ 0.025 (lower limit not stated) |
| Cr | 0.45 ～ 0.85 |