C20GC

2 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 C20GC →

C20GC · ISO 4954

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

Material form: Cold-heading wire
Original record status: Reference transcription of standard
Standard edition: ISO 4954:2018
Table / clause: Table A.2

Carbon-equivalent reference

IIW / CEV：0.2967–0.4900Known-element contribution; incomplete value; missing V; 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）：0.2200–0.3150Known-element contribution; incomplete value; missing 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：0.2500–0.3575 Independent-element envelope of standard ranges, not measured heat results; coupled-element constraints require separate checks, and 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	0.18 ～ 0.22
Si	0.15 ～ 0.25
Mn	0.7 ～ 0.9
P	≤ 0.025 (lower limit not stated)
S	≤ 0.025 (lower limit not stated)
Cr	≤ 0.3 (lower limit not stated)
Ni	≤ 0.3 (lower limit not stated)
Mo	≤ 0.1 (lower limit not stated)
Cu	≤ 0.3 (lower limit not stated)
Cr+Ni+Mo	≤ 0.5 (lower limit not stated)

Applicability and limitations

ISO 4954:2018; Heat analysis, mass percent; Values without stated ranges are maxima; See the original page for the complete table notes. No edition is stated on the website; Displayed under this source edition; contract applicability is not established; ISO4954:2018 Table A.2 applies to steels not intended for heat treatment after cold working, heat analysis wt%; The original text specifies Cr+Ni+Mo total ≤0.50%; in addition to individual element limits, the total must also be satisfied; Elements not entered shall remain unknown and not be treated as 0; Optional deoxidation/aluminum substitution and Mn agreements shall still be verified against explicit ordering conditions.

Combined limits

Element-sum limits

Elements concerned
- Cr
- Ni
- Mo
Upper limit
0.5

Verification notes

Standard source: ISO 4954:2018 · Table A.2View associated products →

C20GC · ISO 4954-2018

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

Material category: Carbon steel
Subcategory: Steel not heat-treated after cold working
Material form: Reference record
Original record status: Original standard verified
Standard edition: ISO 4954:2018
Table / clause: Table A.2

Carbon-equivalent reference

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

Note c, quality a: Al≤0.015%

IIW / CEV：0.2967–0.4900Known-element contribution; incomplete value; missing V; ordering or conditional requirements remain unresolved; 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）：0.2200–0.3150Known-element contribution; incomplete value; missing V, B; ordering or conditional requirements remain unresolved; 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：0.2500–0.3575 Independent-element envelope of standard ranges, not measured heat results; ordering or conditional requirements remain unresolved; coupled-element constraints require separate checks, and 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.

Note c, quality b: no addition of Al, Si0.15–0.25%; No intentional addition does not mean an analyzed content of 0

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

Element	Composition requirement
C	0.18 ～ 0.22
Si	0.15 ～ 0.25
Mn	0.7 ～ 0.9
P	≤ 0.025 (lower limit not stated)
S	≤ 0.025 (lower limit not stated)
Cr	≤ 0.3 (lower limit not stated)
Ni	≤ 0.3 (lower limit not stated)
Mo	≤ 0.1 (lower limit not stated)
Cu	≤ 0.3 (lower limit not stated)

Applicability and limitations

ISO 4954:2018, Table A.2 gives heat analysis; A single value is a maximum; a dash is not zero. ; Product-analysis tolerances are listed separately under Table 2/3 of the standard and do not directly widen the heat-analysis composition ranges. ; Applicable to steels that do not undergo heat treatment after cold working. ; Al may be replaced by other elements with similar effects; Al cannot be required to reach the lower limit listed in the table without conditions. ; A lower Mn may be specified for C2C/C20C/C20GC/C25C, with a range width of 0.20%; Subject to ordering agreement. ; Note c Two quality levels: Al ≤0.015%; Alternatively, no Al addition and Si 0.15–0.25% for hot-dip galvanizing.. Apply after selection.

Combined limits

Element-sum limits

Elements concerned
- Cr
- Ni
- Mo
Upper limit
0.5

Conditional composition lower limit

Al

Applicable conditions: May be replaced by other elements with a similar effect

Original condition-branch records

Note c, quality a: Al≤0.015%

Element	Composition requirement
C	0.18 ～ 0.22
Si	0.15 ～ 0.25
Mn	0.7 ～ 0.9
P	≤ 0.025 (lower limit not stated)
S	≤ 0.025 (lower limit not stated)
Cr	≤ 0.3 (lower limit not stated)
Ni	≤ 0.3 (lower limit not stated)
Mo	≤ 0.1 (lower limit not stated)
Cu	≤ 0.3 (lower limit not stated)
Al	≤ 0.015 (lower limit not stated)

Note c, quality b: no addition of Al, Si0.15–0.25%; No intentional addition does not mean an analyzed content of 0

Element	Composition requirement
C	0.18 ～ 0.22
Si	0.15 ～ 0.25
Mn	0.7 ～ 0.9
P	≤ 0.025 (lower limit not stated)
S	≤ 0.025 (lower limit not stated)
Cr	≤ 0.3 (lower limit not stated)
Ni	≤ 0.3 (lower limit not stated)
Mo	≤ 0.1 (lower limit not stated)
Cu	≤ 0.3 (lower limit not stated)

A condition branch must be selected

Yes

Verification notes

The original standard, Table A.2 and footnotes have been checked