SNC631

3 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 SNC631 →

SNC631 · JIS G4053

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 4053:2008
Table / clause: Table 2

Carbon-equivalent reference

IIW / CEV：0.6150–0.8783Known-element contribution; incomplete value; missing Mo, V 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）：0.3642–0.5092Known-element contribution; incomplete value; missing 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：0.3975–0.5550Known-element contribution; incomplete value; missing Mo 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	0.27 ～ 0.35
Si	0.15 ～ 0.35
Mn	0.35 ～ 0.65
P	≤ 0.03 (lower limit not stated)
S	≤ 0.03 (lower limit not stated)
Ni	2.5 ～ 3.0
Cr	0.6 ～ 1.0
Cu	≤ 0.3 (lower limit not stated)

Applicability and limitations

JIS G 4053:2008; Heat analysis, mass percent; See the original page for table notes and applicability conditions. Cu≤0.30%; Al for SACM645 follows the continued table. No edition is stated on the website; Displayed under this source edition; contract applicability is not established

Verification notes

Standard source: JIS G 4053:2008 · Table 2View associated products →

SNC631 · JIS G 4053-2008

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: JIS G 4053-2008
Table / clause: Table 2 · continued table · Notes a/b; Clause 5

Carbon-equivalent reference

Composition

Element	Composition requirement
C	0.27 ～ 0.35
Si	0.15 ～ 0.35
Mn	0.35 ～ 0.65
P	≤ 0.03 (lower limit not stated)
S	≤ 0.03 (lower limit not stated)
Ni	2.5 ～ 3.0
Cr	0.6 ～ 1.0
Cu	≤ 0.3 (lower limit not stated)

Applicability and limitations

Heat analysis, mass percent (wt%); product analysis tolerances are specified separately in JIS G 0321 Table 4 and must not be used to widen the heat-analysis ranges. Residual Cu ≤0.30% for all grades; an unspecified Mo value must not be treated as zero. For SNCM630, the Mo lower limit may be reduced to 0.30% only by agreement between both parties; SACM645 must separately meet Al 0.70–1.20%. Suitability for a specific cold-heading part must be confirmed separately against delivery condition, spheroidization, deformation, surface quality and testing.

Verification notes

The 2008 Japanese original Table 2 and footnotes were checked row by row

SNC631 · CHINA STEEL CORPORATION · Bars and Wire Rods Product Catalogue 2014-C1 / 7.1.11 JIS G4053 (Edition unspecified)

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

Material category: Alloy steel
Subcategory: Alloy steel
Material form: Bars and wire rod
Original record status: Manufacturer source verified
Document edition: CAT.NO.3-BD-01-2014-C1 (stated on the back cover)
Document title: Bars and Wire Rods Product Catalogue
Table / clause: 7.1.11 JIS G4053 (Edition unspecified)
PDF page references: 20
Unit: Mass fraction (%)
Analysis type: The original catalogue does not explicitly identify the analysis type for this table
Manufacturer: CHINA 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	0.27 ～ 0.35
Si	0.15 ～ 0.35
Mn	0.35 ～ 0.65
P	≤ 0.03 (lower limit not stated)
S	≤ 0.03 (lower limit not stated)
Ni	2.5 ～ 3.0
Cr	0.6 ～ 1.0
Cu	≤ 0.3 (lower limit not stated)

Applicability and limitations

CSC bars and wire rods catalogue CAT.NO.3-BD-01-2014-C1, PDF page 20

printed page 18; clause 7.1.11 cites JIS G4053 (edition not stated). The original catalogue does not specify the analysis type for this table. Historical manufacturer scope data; neither standard guaranteed values nor measured heat analysis, and not evidence of supply by our company.

Composition conditions

Historical manufacturer 2014-C1 catalogue, bars/wire rod; Where the referenced standard edition is not identified, a year is not borrowed from another catalogue; a catalogue is not upgraded to the official standard text.
A dash or blank must not be treated as zero. Composition data do not establish completeness or applicability of a formula; mechanical properties and supply require separate verification.

Verification notes

Merged cells in all 28 catalogue tables were reconstructed geometrically, with no missing cells. Original images, continuation pages and notes are recorded; disputed conditions are withheld.