SMNC443

5 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 SMNC443 →

SMnC443 · 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: Source edition identified; composition verification pending
Standard edition: JIS G 4053-2008
Table / clause: Table 2 · continued table · Notes a/b; Clause 5

Carbon-equivalent reference

IIW / CEV：0.6950–0.9117Known-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）：0.4900–0.6083Known-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：0.5525–0.6813Known-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	0.4 ～ 0.46
Si	0.15 ～ 0.35
Mn	1.35 ～ 1.65
P	≤ 0.03 (lower limit not stated)
S	≤ 0.03 (lower limit not stated)
Ni	≤ 0.25 (lower limit not stated)
Cr	0.35 ～ 0.7
Cu	≤ 0.3 (lower limit not stated)

Applicability and limitations

Composition is based on JIS G 4053-2008; the product edition is unspecified, so confirm the edition applicable under the contract.

Composition conditions

Heat-analysis mass fractions wt%; Permissible deviations for product analysis shall follow JIS G0321 Table 4 separately; the heat analysis range cannot be directly extended.
Residual Cu ≤ 0.30% for all grades; When Mo is unspecified, it cannot be calculated as zero.
For SNCM630, the Mo lower limit can be reduced to 0.30% only by agreement between both parties; SACM645 shall additionally satisfy Al 0.70–1.20%.
Whether it is suitable for specific cold-heading parts must be confirmed separately in conjunction with delivery condition, spheroidization, deformation amount, surface quality, and testing.

Verification notes

Composition is based on JIS G 4053-2008; the product edition is unspecified, so confirm the edition applicable under the contract.View associated products →

SMnC443 · 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	0.4 ～ 0.46
Si	0.15 ～ 0.35
Mn	1.35 ～ 1.65
P	≤ 0.03 (lower limit not stated)
S	≤ 0.03 (lower limit not stated)
Ni	≤ 0.25 (lower limit not stated)
Cr	0.35 ～ 0.7
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

SMnC443 · JIS G 4053-2016

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

Material form: Reference record
Original record status: Historical-edition reference
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	0.4 ～ 0.46
Si	0.15 ～ 0.35
Mn	1.35 ～ 1.65
P	≤ 0.03 (lower limit not stated)
S	≤ 0.03 (lower limit not stated)
Ni	≤ 0.25 (lower limit not stated)
Cr	0.35 ～ 0.7
Cu	≤ 0.3 (lower limit not stated)

Applicability and limitations

The chemical composition currently shown is transcribed from the original JIS G 4053-2008; The original record cites JIS G 4053-2016; that original edition remains unavailable, and differences between editions have not been confirmed. Heat-analysis mass fractions wt%; Permissible deviations for product analysis shall follow JIS G0321 Table 4 separately; the heat analysis range cannot be directly extended. ; Residual Cu ≤ 0.30% for all grades; When Mo is unspecified, it cannot be calculated as zero. ; For SNCM630, the Mo lower limit can be reduced to 0.30% only by agreement between both parties; SACM645 shall additionally satisfy Al 0.70–1.20%. ; Whether it is suitable for specific cold-heading parts must be confirmed separately in conjunction with delivery condition, spheroidization, deformation amount, surface quality, and testing.

Verification notes

The composition currently shown is from the original JIS G 4053-2008. The source record cites JIS G 4053-2016; that original is still to be obtained, and differences between editions have not been confirmed.

SMnC443 · Nippon Steel Wire Rods EXE203 2008.3 / JIS G4053-2003

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: Wire rod
Original record status: Manufacturer source verified
Document edition: Cat. No. EXE203 2008.3 PDF; cover copyright 2008
Document title: Nippon Steel Wire Rods
Table / clause: Printed page 16, table index 4
PDF page references: 10
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	0.4 ～ 0.46
Si	0.15 ～ 0.35
Mn	1.35 ～ 1.65
P	≤ 0.03 (lower limit not stated)
S	≤ 0.03 (lower limit not stated)
Ni	≤ 0.25 (lower limit not stated)
Cr	0.35 ～ 0.7
Cu	≤ 0.3 (lower limit not stated)

Applicability and limitations

Nippon Steel wire-rod catalogue EXE203 2008.3, historical material; PDF p. 10

printed p. 16; JIS G4053-2003. The original catalogue does not specify the analysis type for this table. Manufacturer range data; not a standard guarantee or a heat-lot test, and does not represent our supply.

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.

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.

SMnC443 · Japanese standard (number not stated)

Original-source verification is incomplete; this is not a formal standard reference

Material category: Alloy steel
Subcategory: Alloy steel
Material form: Reference record
Verification status: Reference data; original source not verified

Carbon-equivalent reference

IIW / CEV: composition source not verified; standard-range carbon equivalent is not calculated

Pcm (Ito–Bessyo): composition source not verified; standard-range carbon equivalent is not calculated

CET: composition source not verified; standard-range carbon equivalent is not calculated

Composition

Element	Composition requirement
C	0.4 ～ 0.46
Cr	0.35 ～ 0.7
Cu	≤ 0.3 (lower limit not stated)
Mn	1.35 ～ 1.65
Ni	≤ 0.25 (lower limit not stated)
P	≤ 0.03 (lower limit not stated)
S	≤ 0.03 (lower limit not stated)
Si	0.15 ～ 0.35

Applicability and limitations

A match in the materials database does not establish suitability for cold heading or guarantee finished-product strength. Confirmation must consider wire condition, deformation, heat treatment and tests on actual parts.