SUM25

4 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 SUM25 →

SUM25 · JIS G4804

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

Material form: Wire rod
Original record status: Reference transcription of standard
Standard edition: JIS G 4804:2008
Table / clause: Table 1

Carbon-equivalent reference

IIW / CEV：0.1500–0.3833 Known-item contribution, not a complete value; missing Cr, Mo, V, Ni, Cu 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）：0.0450–0.2200Known-element contribution; incomplete value; missing Si, Cu, Cr, Ni, Mo, V, B 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：0.0900–0.2900 Known-item contribution, not a complete value; missing Mo, Cr, Cu, Ni 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	≤ 0.15 (lower limit not stated)
Mn	0.9 ～ 1.4
P	0.07 ～ 0.12
S	0.3 ～ 0.4

Applicability and limitations

JIS G 4804:2008; Heat analysis, mass percent; See the original page for table notes and applicability conditions. No edition is stated on the website; Displayed under this source edition; contract applicability is not established

Verification notes

Standard source: JIS G 4804:2008 · Table 1View associated products →

SUM25 · JIS G 4804:2008

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

Material category: Carbon steel
Subcategory: Free-cutting steel
Material form: Reference record
Original record status: Original standard verified
Standard edition: JIS G 4804:2008
Table / clause: Table 1 · Notes a–d

Carbon-equivalent reference

Estimates are presented separately for each applicable composition condition. Match the actual ordering conditions; ranges must not be combined.

Heat analysis; Si is unspecified

Heat analysis; Agreed Si≤0.10%

Pcm（Ito–Bessyo）：0.0450–0.2233 Known-item contribution, not a complete value; missing Cu, Cr, Ni, Mo, V, B 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%.

Heat analysis; Agreed Si0.10–0.20%

Pcm（Ito–Bessyo）：0.0483–0.2267 Known-item contribution, not a complete value; missing Cu, Cr, Ni, Mo, V, B 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%.

Heat analysis; Agreed Si0.15–0.35%

Pcm（Ito–Bessyo）：0.0500–0.2317 Known-item contribution, not a complete value; missing Cu, Cr, Ni, Mo, V, B 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%.

Composition record (conditional branches apply; this is not an unconditional requirement)

Element	Composition requirement
C	≤ 0.15 (lower limit not stated)
Mn	0.9 ～ 1.4
P	0.07 ～ 0.12
S	0.3 ～ 0.4

Applicability and limitations

Table 1 mass fraction %, default is heat analysis. ; Note a: Si is not specified; it may be agreed to use ≤0.10%, 0.10–0.20%, 0.15–0.35%, etc.; The listed items are not the only possible agreed ranges. ; Note b: Without agreement between both parties, elements not specified shall not be intentionally added for purposes other than to finish steelmaking; Blank entries must not be treated as zero. ; Note c: Only SUM22/SUM22L may have an agreed Mn upper limit of 1.10%. ; Note d: For lead-bearing steels, when the purchaser requests Pb product analysis, Pb 0.07–0.35%; Do not use this lower limit to replace heat analysis 0.10%. ; The composition of high-sulfur free-cutting steel does not equate to suitability for cold heading; plasticity and part processes must be verified independently.

Original condition-branch records

Heat analysis; Si is unspecified

Element	Composition requirement
C	≤ 0.15 (lower limit not stated)
Mn	0.9 ～ 1.4
P	0.07 ～ 0.12
S	0.3 ～ 0.4

Heat analysis; Agreed Si≤0.10%

Element	Composition requirement
C	≤ 0.15 (lower limit not stated)
Mn	0.9 ～ 1.4
P	0.07 ～ 0.12
S	0.3 ～ 0.4
Si	≤ 0.1 (lower limit not stated)

Heat analysis; Agreed Si0.10–0.20%

Element	Composition requirement
C	≤ 0.15 (lower limit not stated)
Mn	0.9 ～ 1.4
P	0.07 ～ 0.12
S	0.3 ～ 0.4
Si	0.1 ～ 0.2

Heat analysis; Agreed Si0.15–0.35%

Element	Composition requirement
C	≤ 0.15 (lower limit not stated)
Mn	0.9 ～ 1.4
P	0.07 ～ 0.12
S	0.3 ～ 0.4
Si	0.15 ～ 0.35

A condition branch must be selected

Yes

Verification notes

Original Japanese PDF4, Table 1 and all footnotes have been checked

SUM25 · POSCO wire rod catalogue (local archive 1203; original edition not stated)

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

Material category: Free-cutting steel
Subcategory: Free-cutting steel
Material form: Wire rod
Original record status: Manufacturer source verified
Document edition: Local file 1203 (wire-rod pdf); the original does not state a publication edition; PDF metadata 2014-12-03 is only the file generation time
Document title: Wire rod
Table / clause: Printed page 19, composition table 2 (local table index)
PDF page references: 10
Unit: Percentages as stated in the original table; refer to the source for the specific basis
Analysis type: The catalog does not consistently specify heat or product analysis
Manufacturer: POSCO

Carbon-equivalent reference

Estimate from manufacturer-published ranges, not a standard guarantee or measured heat result; formula applicability requires review against the application and process.

IIW / CEV：0.1500–0.3833Known-element contribution; incomplete value; missing Cr, Mo, V, Ni, Cu; ordering or conditional requirements remain unresolved 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）：0.0450–0.2200Known-element contribution; incomplete value; missing Si, Cu, Cr, Ni, Mo, V, B; ordering or conditional requirements remain unresolved 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：0.0900–0.2900Known-element contribution; incomplete value; missing Mo, Cr, Cu, Ni; ordering or conditional requirements remain unresolved 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	≤ 0.15 (lower limit not stated)
Mn	0.9 ～ 1.4
P	0.07 ～ 0.12
S	0.26 ～ 0.35

Applicability and limitations

POSCO local wire rod catalogue, PDF page 10

printed page 19, table index 1, row 6. The original edition number is not stated; the PDF creation date 2014-12-03 is not the standard publication year. Manufacturer range information does not constitute our supply guarantee. Table notes generally do not specify Si; an upper limit or listed range may be agreed. Without agreed conditions, Si remains unspecified.

Composition conditions

Original catalog chemical composition table %, wire rod; Editions of JIS/SAE/DIN were not provided; catalog data shall not be upgraded to the verified official editions of these standards.
Dashes are not zero; cast/product analysis types are not consistently explicit. Orders, product-analysis deviations and actual supply require separate verification.
In principle, Si is not specified in the table notes; an upper limit or the listed range may be selected by agreement; Si remains unspecified when no agreement conditions are provided.

Verification notes

The original PDF tables and text coordinates were reconciled in both directions. Missing grade cells were restored; merged cells, footers and remarks were checked separately. Tables with identified disputes and rows without composition data are withheld.

SUM25 · Nippon Steel Wire Rods EXE203 2008.3 / JIS G4804-1999

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

Material category: Free-cutting steel
Subcategory: Free-cutting steel
Material form: Wire rod
Original record status: Manufacturer source verified
Document title: Nippon Steel Wire Rods
Table / clause: Printed page 19, table index 2
PDF page references: 11
Unit: Mass fraction (%)
Analysis type: The original catalogue does not explicitly identify the analysis type for this table
Manufacturer: NIPPON STEEL CORPORATION

Carbon-equivalent reference

Estimate from manufacturer-published ranges, not a standard guarantee or measured heat result; formula applicability requires review against the application and process.

Composition

Element	Composition requirement
C	≤ 0.15 (lower limit not stated)
Mn	0.9 ～ 1.4
P	0.07 ～ 0.12
S	0.3 ～ 0.4

Applicability and limitations

Historical Nippon Steel wire-rod catalogue EXE203 2008.3, PDF page 11

printed page 19, JIS G4804-1999. The original catalogue does not explicitly identify the analysis type for this table. Manufacturer range data, not guaranteed standard limits or heat-specific measurements; this does not establish supply by Creation Group. Condition: Si follows the agreed options in the original text; no option is selected by default, and the options are not merged into one wider range; If not selected, it is excluded from complete calculations or assessments.

Composition conditions

Original catalogue mass percentages, historical manufacturer data from 2008.3; Referenced standard names and editions follow the original document; this does not establish that the official texts of those standards have been obtained and verified.
A dash or blank must not be treated as 0; only chemical composition has been checked in this batch. Mechanical properties and actual supply require separate verification under the applicable conditions.
Si follows the agreed options in the original text; no option is selected by default, and the options are not merged into one wider range; If not selected, it is excluded from complete calculations or assessments.

Verification notes

Grouped tables were expanded in full and checked against original images and notes. Ordinary, residual and conditional elements are kept separate; suffix tables lacking complete base-steel composition are excluded.